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Parameter identification of hysteretic model of rubber-bearing based on sequential nonlinear least-square estimation 被引量:10
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作者 Yin Qiang Zhou Li Wang Xinming 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2010年第3期375-383,共9页
In order to evaluate the nonlinear performance and the possible damage to rubber-bearings (RBs) during their normal operation or under strong earthquakes, a simplified Bouc-Wen model is used to describe the nonlinea... In order to evaluate the nonlinear performance and the possible damage to rubber-bearings (RBs) during their normal operation or under strong earthquakes, a simplified Bouc-Wen model is used to describe the nonlinear hysteretic behavior of RBs in this paper, which has the advantages of being smooth-varying and physically motivated. Further, based on the results from experimental tests performed by using a particular type of RB (GZN 110) under different excitation scenarios, including white noise and several earthquakes, a new system identification method, referred to as the sequential nonlinear least- square estimation (SNLSE), is introduced to identify the model parameters. It is shown that the proposed simplified Bouc- Wen model is capable of describing the nonlinear hysteretic behavior of RBs, and that the SNLSE approach is very effective in identifying the model parameters of RBs. 展开更多
关键词 parameter identification rubber-bearing hysteretic behavior bouc-wen model sequential nonlinear least- square estimation
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Calibration of a hysteretic model for glass fiber reinforced gypsum wall panels 被引量:4
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作者 Maganti Janardhana Robin Davis P +2 位作者 S.S.Ravichandran A.M.Prasad D.Menon 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2014年第2期347-355,共9页
Glass fi ber reinforced gypsum(GFRG) wall panels are prefabricated panels with hollow cores, originally developed in Australia and subsequently adopted by India and China for use in buildings. This paper discusses ide... Glass fi ber reinforced gypsum(GFRG) wall panels are prefabricated panels with hollow cores, originally developed in Australia and subsequently adopted by India and China for use in buildings. This paper discusses identifi cation and calibration of a suitable hysteretic model for GFRG wall panels fi lled with reinforced concrete. As considerable pinching was observed in the experimental results, a suitable hysteretic model with pinched hysteretic rule is used to conduct a series of quasi-static as inelastic hysteretic response analyses of GFRG panels with two different widths. The calibration of the pinching model parameters was carried out to approximately match the simulated and experimental responses up to 80% of the peak load in the post peak region. Interestingly, the same values of various parameters(energy dissipation and pinching related parameters) were obtained for all fi ve test specimens. 展开更多
关键词 glass fi ber reinforced gypsum walls hysteretic model pinching model
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Vortex-Induced Vibrations of A Free-Spanning Pipe Based on A Nonlinear Hysteretic Soil Model at the Shoulders 被引量:1
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作者 GAO Xi-feng XIE Wu-de XU Wan-hai 《China Ocean Engineering》 SCIE EI CSCD 2020年第3期328-340,共13页
The pipe-soil interactions at shoulders can significantly affect the vortex-induced vibrations (VIV) of free-spanning pipes in the subsea. In this paper, the seabed soil reacting force on the pipe is directly calculat... The pipe-soil interactions at shoulders can significantly affect the vortex-induced vibrations (VIV) of free-spanning pipes in the subsea. In this paper, the seabed soil reacting force on the pipe is directly calculated with a nonlinear hysteretic soil model. For the VIV in the middle span, a classic van der Pol wake oscillator is adopted. Based on the Euler-Bernoulli beam theory, the vibration equations of the pipe are obtained which are different in the middle span and at the two end shoulders. The static configuration of the pipe is firstly calculated and then the VIV is simulated.The present model is validated with the comparisons of VIV experiment, pipe-soil interaction experiment and the simulation results of VIV of free-spanning pipes in which the seabed soil is modelled with spring-dashpots. With the present model, the influence of seabed soil on the VIV of a free-spanning pipe is analyzed. The parametric studies show that when the seabed soil has a larger suction area, the pipe vibrates with smaller bending stresses and is safer.While with the increase of the shear strength of the seabed soil, the bending stresses increase and the pipe faces more danger. 展开更多
关键词 free-spanning pipe vortex-induced vibrations nonlinear hysteretic soil model bending stresses
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Experimental investigation and analytically modeling of hysteretic behavior of rigid bus-flexible connectors of 220 kV electrical substations
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作者 Tang Tingxuan He Jun 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2023年第3期841-852,共12页
This paper describes the quasi-static testing and analytical modelling of the hysteretic behavior of aluminum alloy rigid bus-flexible connectors of 220 kV electrical substations.The main objective of the study is to ... This paper describes the quasi-static testing and analytical modelling of the hysteretic behavior of aluminum alloy rigid bus-flexible connectors of 220 kV electrical substations.The main objective of the study is to experimentally investigate the hysteretic behavior of six different types of rigid bus-flexible connectors 220 kV electrical substations when subjected to cyclic loading.Another objective is to theoretically study the flexibility and effectiveness of a previously proposed analytical model in fitting the experimental hysteresis loops of the tested rigid bus-flexible connectors.The experimental investigation indicates that the tested rigid bus-flexible connectors exhibit highly asymmetric hysteresis behavior along with tension stiffening effect.The theoretical study demonstrates that the generalized Bouc-Wen model has high flexibility and is effective in fitting the experimental hysteresis resisting force-displacement curves of the six tested rigid bus-flexible connectors. 展开更多
关键词 rigid bus-flexible connectors 220 kV electrical substations hysteretic behavior experimental curves analytical model
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Hysteretic model for bending-type frictional steel truss coupling beams
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作者 Xin Yu Zhuoxin Wang +2 位作者 Yao Cui Tianjiao Wu Linlin Xie 《Resilient Cities and Structures》 2023年第1期18-27,共10页
As a novel coupling beam for coupled shear wall structures,the bending-type frictional steel truss coupling beam(BFTCB)concentrates the deformation and energy dissipation in friction dampers at the bottom chord,allowi... As a novel coupling beam for coupled shear wall structures,the bending-type frictional steel truss coupling beam(BFTCB)concentrates the deformation and energy dissipation in friction dampers at the bottom chord,allowing the main body to remain elastic during earthquakes.As the preparatory work for resilient structure design based on the BFTCB,this work concentrates on developing the hysteretic model for BFTCB.Firstly,the BFTCB stiffness-strength decoupling mechanism was introduced,i.e.,the shear strength is provided by friction dampers while webs control its initial stiffness.Secondly,a hysteretic model that reflects the BFTCB two-stage sliding characteristic was proposed.The model consists of a trilinear backbone curve and the unloading and reverse loading rules.The model has eight control parameters,of which two core parameters(initial stiffness and limiting shear strength)are derived from the BFTCB stiffness-strength decoupling mechanism,whereas the remaining parameters are obtained by theoretical analysis and empirical calibration.The hysteretic model was then compared with the test curves and demonstrated good accuracy.Finally,a series of FE prototypes of BFTCB with different design stiffnesses and strengths was adopted to verify the hysteretic model.The results showed that the proposed model fitted well with the FE prototypes,indicating its applicability to BFTCB with varying core design parameters.Therefore,the hysteretic model can be adopted for BFTCB to support the resilient shear wall structure design. 展开更多
关键词 Bending-type frictional steel truss coupling beam(BFTCB) Stiffness-strength decoupling mechanism hysteretic test curve Two-stage sliding characteristic hysteretic model
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基于新的改进Bouc-Wen模型的预制RC桥墩滞回模型研究 被引量:1
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作者 徐亚洲 魏克伦 丁艳琼 《工程力学》 EI CSCD 北大核心 2024年第2期180-193,共14页
Bouc-Wen-Baber-Noori(BWBN)模型是改进的Bouc-Wen模型。BWBN模型可以较好地描述钢筋混凝土结构在强震作用下的捏缩效应,但由于BWBN模型中“捏缩效应”函数复杂且参数较多,其计算效率较低。针对该问题,该文基于近似狄拉克δ函数构建更... Bouc-Wen-Baber-Noori(BWBN)模型是改进的Bouc-Wen模型。BWBN模型可以较好地描述钢筋混凝土结构在强震作用下的捏缩效应,但由于BWBN模型中“捏缩效应”函数复杂且参数较多,其计算效率较低。针对该问题,该文基于近似狄拉克δ函数构建更简单、高效的“捏缩效应”函数,进而提出了新的改进Bouc-Wen(MBW)模型,它可以用更少的参数来实现捏缩效应。基于预制RC桥墩的拟静力试验数据来验证MBW模型的有效性,利用MATLAB遗传算法工具箱对BWBN模型和MBW模型进行参数识别,结果表明,该文提出的MBW模型具有更高的计算精度。 展开更多
关键词 预制RC桥墩 滞回模型 狄拉克δ函数 捏缩效应 参数识别
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Correlation failure analysis of an uncertain hysteretic vibration system 被引量:3
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作者 张旭方 张义民 郝秋菊 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2008年第1期57-65,共9页
In this paper, a numerical method for correlation sensitivity analysis of a nonlinear random vibration system is presented. Based on the first passage failure model, the probability perturbation method is employed to ... In this paper, a numerical method for correlation sensitivity analysis of a nonlinear random vibration system is presented. Based on the first passage failure model, the probability perturbation method is employed to determine the statistical characteristics of failure modes and the correlation between them. The sensitivity of correlation between failure modes with respect to random parameters characterizing the uncertainty of the hysteretic loop is discussed. In a numerical example, a two-DOF shear structure with uncertain hysteretic restoring force is considered. The statistical characteristics of response, failure modes and the sensitivity of random hysteretic loop parameters are provided, and also compared with a Monte Carlo simulation. 展开更多
关键词 correlated failure modes uncertain hysteretic loop parameter sensitivity analysis nonlinear randomvibration first passage failure model Monte Carlo simulation
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Experimental and numerical study on hysteretic performance of SMA spring-friction bearings 被引量:2
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作者 Zhuang Peng Xue Suduo +1 位作者 Nie Pan Wang Wenting 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2016年第4期597-609,共13页
This paper presents an experimental and numerical study to investigate the hysteretic performance of a new type of isolator consisting of shape memory alloy springs and friction bearing called an SMA spring-friction b... This paper presents an experimental and numerical study to investigate the hysteretic performance of a new type of isolator consisting of shape memory alloy springs and friction bearing called an SMA spring-friction bearing (SFB). The SFB is a sliding-type isolator with SMA devices used for the seismic protection of engineering structures. The principle of operation of the isolation bearing is introduced. In order to explore the possibility of applying SMA elements in passive seismic control devices, large diameter superelastic tension/compression NiTi SMA helical springs used in the SFB isolator were developed. Mechanical experiments of the SMA helical spring were carried out to understand its superelastic characteristics. After that, a series of quasi-static tests on a single SFB isolator prototype were conducted to measure its force-displacement relationships for different loading conditions and study the corresponding variation law of its mechanical performance. The experimental results demonstrate that the SFB exhibits full hysteretic curves, excellent energy dissipation capacity, and moderate recentering ability. Finally, a theoretical model capable of emulating the hysteretic behavior of the SMA-based isolator was then established and implemented in MATLAB software. The comparison of the numerical results with the experimental results shows the efficacy of the proposed model for simulating the response of the SFB. 展开更多
关键词 sliding isolation bearing SMA helical spring hysteretic performance quasi-static test theoretical model
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Research on linear/nonlinear viscous damping and hysteretic damping in nonlinear vibration isolation systems 被引量:1
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作者 Zhong ZHANG Muqing NIU +1 位作者 Kai YUAN Yewei ZHANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2020年第7期983-998,共16页
A nonlinear vibration isolation system is promising to provide a high-efficient broadband isolation performance.In this paper,a generalized vibration isolation system is established with nonlinear stiffness,nonlinear ... A nonlinear vibration isolation system is promising to provide a high-efficient broadband isolation performance.In this paper,a generalized vibration isolation system is established with nonlinear stiffness,nonlinear viscous damping,and Bouc-Wen(BW)hysteretic damping.An approximate analytical analysis is performed based on a harmonic balance method(HBM)and an alternating frequency/time(AFT)domain technique.To evaluate the damping effect,a generalized equivalent damping ratio is defined with the stiffness-varying characteristics.A comprehensive comparison of different kinds of damping is made through numerical simulations.It is found that the damping ratio of the linear damping is related to the stiffness-varying characteristics while the damping ratios of two kinds of nonlinear damping are related to the responding amplitudes.The linear damping,hysteretic damping,and nonlinear viscous damping are suitable for the small-amplitude,medium-amplitude,and large-amplitude conditions,respectively.The hysteretic damping has an extra advantage of broadband isolation. 展开更多
关键词 vibration isolation nonlinear damping bouc-wen(BW)model harmonic balance method(HBM)
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A statistically refined Bouc-Wen model for the identification of structures under tri-directional seismic excitations
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作者 LIN Jeng-wen 《Journal of Civil Engineering and Architecture》 2009年第5期22-29,45,共9页
This paper presents a statistically refined Bouc-Wen model of tri-axial interactions for the identification of structural systems under tri-directional seismic excitations. Through limited vibration measurements in th... This paper presents a statistically refined Bouc-Wen model of tri-axial interactions for the identification of structural systems under tri-directional seismic excitations. Through limited vibration measurements in the National Center for Research on Earthquake Engineering in Taiwan conducting model-based experiments, the 3-D Bouc-Wen model has been statistically and repetitively refined using the 95% confidence interval of the estimated structural parameters to determine their statistical significance in a multiple regression setting. When the parameters' confidence interval covers the "null" value, it is statistically sustainable to truncate such parameters. The remaining parameters will repetitively undergo such parameter sifting process for model refinement until all the parameters' statistical significance cannot be further improved. The effectiveness of the refined model has been shown considering the effects of sampling errors, of coupled restoring forces in tri-directions, and of the under-over-parameterization of structural systems. Sifted and estimated parameters such as the stiffness, and its corresponding natural frequency, resulting from the identification methodology developed in this study are carefully observed for system vibration control. 展开更多
关键词 bouc-wen model refinement 95% confidence interval multiple regression natural frequency estimation
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磁流变减振器滞回特性的改进Bouc-Wen模型 被引量:17
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作者 王维锐 吴参 +1 位作者 陈颖 王芳 《农业机械学报》 EI CAS CSCD 北大核心 2011年第2期48-53,共6页
由于现有的磁流变减振器数学模型不能准确描述其特性,因此对大行程磁流变阻尼器进行了动态特性试验。根据测试结果分析激励位移、激励频率和电流变化时,磁流变减振器的弹性、阻尼、电流饱和等基本特征的动态非线性特性。已有的Bouc-Wen... 由于现有的磁流变减振器数学模型不能准确描述其特性,因此对大行程磁流变阻尼器进行了动态特性试验。根据测试结果分析激励位移、激励频率和电流变化时,磁流变减振器的弹性、阻尼、电流饱和等基本特征的动态非线性特性。已有的Bouc-Wen模型在低速下滞回环描述不准确,在高速下缺少滞回特性,并且无法表述单出杆减振器中蓄能器造成阻尼力偏置的现象,因此根据试验结果提出一种改进的Bouc-Wen模型,通过试验数据对改进的Bouc-Wen模型进行参数辨识,并重点分析速度-力特性曲线在低速与高速情况下所形成滞环的斜率及宽度,试验数据验证了改进Bouc-Wen模型的正确性。 展开更多
关键词 磁流变减振器 滞回特性 bouc-wen模型 参数建模
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基于改进Bouc-Wen模型防屈曲支撑的参数识别 被引量:8
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作者 李建勤 高向宇 +1 位作者 刘超 李杨龙 《北京工业大学学报》 CAS CSCD 北大核心 2016年第2期245-252,共8页
为了对"改进Bouc-Wen模型"进行深入研究,提出了该模型的参数拟合方法,并实现了二次开发程序.对30根防屈曲支撑试验的滞回曲线数据进行了参数回归与分析,给出模型参数的变化趋势、波动范围、统计平均值.为了给改进Bouc-Wen模... 为了对"改进Bouc-Wen模型"进行深入研究,提出了该模型的参数拟合方法,并实现了二次开发程序.对30根防屈曲支撑试验的滞回曲线数据进行了参数回归与分析,给出模型参数的变化趋势、波动范围、统计平均值.为了给改进Bouc-Wen模型的应用提供参考,给出了参数取值的建议.应用Abaqus软件中的材料用户子程序(UMAT)的二次开发接口,使"改进Bouc-Wen模型"得以在有限元软件中应用. 展开更多
关键词 防屈曲支撑 参数识别 恢复力模型 bouc-wen模型 UMAT
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Bouc-Wen滞回模型的直接表示形式及其工程应用 被引量:3
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作者 沈培辉 林述温 《机械强度》 CAS CSCD 北大核心 2009年第3期360-364,共5页
Bouc-Wen模型广泛用于描述工程结构中的非线性滞回特性,然而该模型中的滞回恢复力与相对位移变形量的关系以微分形式给出,不能直接迭代滞回模型到系统运动控制方程,从而增加了解析法分析系统动力响应的难度。文中提出采用直接表示形式代... Bouc-Wen模型广泛用于描述工程结构中的非线性滞回特性,然而该模型中的滞回恢复力与相对位移变形量的关系以微分形式给出,不能直接迭代滞回模型到系统运动控制方程,从而增加了解析法分析系统动力响应的难度。文中提出采用直接表示形式代替Bouc-Wen的微分模型,在弱非线性情况下,假定滞回恢复力可以表示为相对变形位移的指数形式,并进一步用泰勒展开的方法表示为简单的多项式形式。通过实例分析,验证多项式直接表示模型的可行性,其中二阶近似形式比一阶近似形式更为接近微分模型。将该直接表示模型应用于单自由度振动系统中,发现系统的动力响应和采用微分模型的响应基本吻合,其中具有软特性的系统响应尤为接近。 展开更多
关键词 非线性 滞回模型 bouc-wen模型 多项式 动力响应
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板簧Bouc-Wen迟滞模型的仿真与试验研究 被引量:3
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作者 章杰 吴茵 +2 位作者 张邦基 张农 刘献忠 《汽车工程》 EI CSCD 北大核心 2017年第12期1402-1408,1443,共8页
为研究矿用车等特种车辆非独立悬架系统的弹性元件板簧的迟滞特性对整车性能的影响,根据Bouc-Wen摩擦学理论建立了板簧动力学模型,通过不同频率和幅值条件下动态加载仿真和试验获取其动态力-位移曲线,并根据试验结果运用最小二乘法辨识... 为研究矿用车等特种车辆非独立悬架系统的弹性元件板簧的迟滞特性对整车性能的影响,根据Bouc-Wen摩擦学理论建立了板簧动力学模型,通过不同频率和幅值条件下动态加载仿真和试验获取其动态力-位移曲线,并根据试验结果运用最小二乘法辨识出Bouc-Wen模型参数。仿真和试验结果吻合良好,表明该模型能准确预测板簧动态迟滞特性。接着进一步建立考虑板簧迟滞特性的整车模型,施加四轮相关的A和E级路面谱激励,以质心加速度均方根值、悬架动行程和轮胎动态力作为评价指标,分析迟滞特性对整车性能的影响。结果表明,在较差路面行驶时板簧迟滞特性有利于提高车辆的平顺性和安全性。 展开更多
关键词 板簧 迟滞特性 bouc-wen模型 平顺性 安全性
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正则化Bouc-Wen模型的参数研究及其在金属阻尼器中的应用 被引量:4
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作者 李宗京 舒赣平 《振动与冲击》 EI CSCD 北大核心 2018年第22期128-135,共8页
针对经典Bouc-Wen模型中存在冗余参数的情况,介绍了一种无冗余参数的正则化Bouc-Wen模型。基于理论推导及编制的Matlab程序,对正则化Bouc-Wen模型各参数与其所描述的金属阻尼器滞回力学参数之间的关系进行了研究。采用局部敏感性分析方... 针对经典Bouc-Wen模型中存在冗余参数的情况,介绍了一种无冗余参数的正则化Bouc-Wen模型。基于理论推导及编制的Matlab程序,对正则化Bouc-Wen模型各参数与其所描述的金属阻尼器滞回力学参数之间的关系进行了研究。采用局部敏感性分析方法基于两种不同的敏感性评价指标对正则化Bouc-Wen模型各参数的敏感性进行了分析。提出了基于改进模拟退火算法的参数拟合方法并进行试验验证。研究结果表明,金属阻尼器的初始弹性刚度kd及屈服力Fdy均由kx、kw、ρ三个参数共同决定,屈服后刚度k'd由参数kx决定,屈服位移udy由参数ρ决定,转向刚度ks与初始弹性刚度kd之间的相对关系由参数σ决定,弹塑性过渡段的圆滑度由参数n决定。正则化Bouc-Wen模型中的kw、ρ两个参数具有较高的敏感性,σ、kx、n三个参数具有较低的敏感性。改进的模拟退火算法能够有效实现对正则化Bouc-Wen模型的参数拟合,金属阻尼器试验滞回曲线与拟合曲线能够较好吻合。 展开更多
关键词 正则化bouc-wen模型 金属阻尼器 滞回参数 模拟退火算法
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基于遗传算法的钢筋混凝土剪力墙Bouc-Wen模型参数识别 被引量:4
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作者 朱奕 章红梅 《结构工程师》 北大核心 2016年第4期58-65,共8页
对钢筋混凝土剪力墙构件层次的滞回行为的合理模拟有着重要的应用及研究价值,但目前剪力墙在反复荷载作用下的非线性模拟仍然存在困难。Bouc-Wen模型是一种平滑模型,以解析公式描述滞回行为,在结构和机械领域有着广泛的应用。本文将剪... 对钢筋混凝土剪力墙构件层次的滞回行为的合理模拟有着重要的应用及研究价值,但目前剪力墙在反复荷载作用下的非线性模拟仍然存在困难。Bouc-Wen模型是一种平滑模型,以解析公式描述滞回行为,在结构和机械领域有着广泛的应用。本文将剪力墙构件在往复荷载作用下的恢复力-位移关系简化为单自由度Bouc-Wen滞回模型。通过分析Bouc-Wen模型特征,给出其参数取值限制,运用遗传算法在已有试验数据基础上完成模型的参数识别。定参后的单自由度Bouc-Wen滞回模型能较好反映构件在往复荷载作用下的强度刚度退化和恢复力峰值特点,模型可作用宏观单元用于结构模型数值模拟。识别过程对类似模型的参数识别具有参考价值。 展开更多
关键词 混凝土剪力墙 滞回模型 遗传算法 Bouc—Wen模型 参数识别
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基于Bouc-Wen模型的阻尼器附加有效阻尼比解析解及应用 被引量:3
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作者 吴山 何浩祥 +1 位作者 王宝顺 陈建伟 《振动与冲击》 EI CSCD 北大核心 2022年第16期10-18,共9页
附加有效阻尼比是评价减震结构性能的重要参数,现有的建筑消能减震技术规程规定应采用双线性模型模拟位移相关型阻尼器恢复力性能,但该模型仅能在拟合位移下准确量化阻尼器耗能能力和附加有效阻尼比。Bouc-Wen模型能够在各级位移下准确... 附加有效阻尼比是评价减震结构性能的重要参数,现有的建筑消能减震技术规程规定应采用双线性模型模拟位移相关型阻尼器恢复力性能,但该模型仅能在拟合位移下准确量化阻尼器耗能能力和附加有效阻尼比。Bouc-Wen模型能够在各级位移下准确量化阻尼器耗能,但目前缺乏基于该模型的附加有效阻尼比计算公式。对Bouc-Wen模型进行显式化解析,推导出基于该模型的阻尼器附加有效阻尼比计算公式。结合试验数据,对采用不同模型表征阻尼器耗能能力的精度进行了数值分析和对比,证明了所提方法的精确性。对基于Bouc-Wen模型的附加有效阻尼比进行参数分析,给出了其变化规律和各性能参数影响。基于有限元分析,对采用不同模型计算结构动力响应和附加有效阻尼比的差异进行了对比,进一步验证了该方法的有效性和应用价值。 展开更多
关键词 减震结构 附加有效阻尼比 bouc-wen模型 双线性模型 滞回耗能
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Restoring-force model of modified RAC columns with silica fume and hybrid fiber 被引量:3
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作者 YANG Tao WANG She-liang LIU Wei 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第11期2674-2684,共11页
In order to establish a restoring-force model for modified concrete columns with recycled aggregates concrete(RAC), cyclic loading tests were carried out on five concretes with RAC columns and ordinary concrete frame ... In order to establish a restoring-force model for modified concrete columns with recycled aggregates concrete(RAC), cyclic loading tests were carried out on five concretes with RAC columns and ordinary concrete frame columns under the combined influence with different admixtures and admixtures ratios(silica fume and hybrid fiber). The expressions for characteristic nodes of the skeleton curve were given by the analysis and numerical regression of the test results. In addition, the hysteretic rules of the restoring-force model and the expression for unloading stiffness were presented. Finally, we summed up the complete calculation method of the hysteretic restoring force, whose results were in good agreement with experiment. The results demonstrated that the proposed model could simulate and reflect the corresponding hysteretic behaviors, and the calculation method can provide the theoretical basis for the engineering application. 展开更多
关键词 MODIFIED RAC COLUMNS skeleton curve unloading stiffness hysteretic rule restoring-force model
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Three-stage Method for Identifying the Dynamic Model Parameters of Stranded Wire Helical Springs 被引量:5
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作者 ZHAO Yu WANG Shilong +2 位作者 ZHOU Jie LI Chuan SUN Shouli 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2015年第1期197-207,共11页
The dynamic behavior of the stranded wire helical spring is described by a modified Bouc-Wen model while the model parameters must be identified using an identification method and experimental data. Existing identific... The dynamic behavior of the stranded wire helical spring is described by a modified Bouc-Wen model while the model parameters must be identified using an identification method and experimental data. Existing identification methods usually relies either solely nonlinear iterative algorithms or manually trial and error. Therefore, the identification process can be rather time consuming and effort taking. As a result, these methods are not ideal for engineering applications. To come up with a more practical method, a three-stage identification method is proposed. Periodic loading and identification simulations are carried out to verify the effectiveness of the proposed method. Noises are added to the simulated data to test the performance of the proposed method when dealing with noise contaminated data. The simulation results indicate that the proposed method is able to give satisfying results when the noise levels are set to be 0.01, 0.03, 0.05 and 0.07. In addition, the proposed method is also applied to experimental data and compared with an existing method. The experimental data is acquired through a periodic loading test. The experiment results suggest that the proposed method features better accuracy compared with the existing method. An effective approach is proposed for identifying the model parameters of the stranded wire helical spring. 展开更多
关键词 Stranded wire helical spring modified bouc-wen model parameter identification OPTIMIZATION
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Nonlinear damage model for seismic damage assessment of reinforced concrete frame members and structures 被引量:1
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作者 Shuijing Xiao Longhe Xu Xiao Lu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2018年第5期949-962,共14页
A nonlinear damage model based on the combination of deformation and hysteretic energy and its validation with experiments are presented.Also,a combination parameter is defined to consider the mutual effect of deforma... A nonlinear damage model based on the combination of deformation and hysteretic energy and its validation with experiments are presented.Also,a combination parameter is defined to consider the mutual effect of deformation and hysteretic energy for different types of components in different loading stages.Four reinforced concrete (RC) columns are simulated and analyzed using the nonlinear damage model.The results indicate that the damage evolution evaluated by the model agrees well with the experimental phenomenon.Furthermore,the seismic damage evolution of a six-story RC frame was analyzed,revealing four typical failure modes according to the interstory drift distribution of the structure;the damage values calculated using the nonlinear damage model agree well with the four typical failure modes. 展开更多
关键词 RC FRAME structure NONLINEAR DAMAGE model DAMAGE evolution COMBINATION PARAMETER hysteretic energy
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