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水力滞回性对降雨入渗边坡稳定性的影响 被引量:1
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作者 孟庆成 王明 +2 位作者 齐欣 魏鑫 张梦宇 《中国地质灾害与防治学报》 CSCD 2018年第4期23-29,共7页
针对目前以土水特性曲线为基础的非饱和土研究不考虑水力滞回性的现状,笔者采用ABAQUS建立了降雨蒸发条件下非饱和土边坡模型,分别对考虑水力滞回性和不考虑水力滞回性的模型,进行了基于强度折减法的边坡稳定性的计算分析,并对比了每12 ... 针对目前以土水特性曲线为基础的非饱和土研究不考虑水力滞回性的现状,笔者采用ABAQUS建立了降雨蒸发条件下非饱和土边坡模型,分别对考虑水力滞回性和不考虑水力滞回性的模型,进行了基于强度折减法的边坡稳定性的计算分析,并对比了每12 h孔隙水和坡脚位移的变化。结果发现:(1)在降雨阶段,考虑了水力滞回性的模型基质吸力总是大于不考虑滞回性的模型,在降雨阶段减小的速度要小于不考虑滞回性的模型,且坡脚处位移较大,坡肩位移较小;(2)在蒸发阶段,基质吸力相比不考虑滞回性的模型恢复速度更快。(3)在降雨、蒸发过程结束后,基质吸力几乎是不考虑滞回性的模型的2倍,考虑水力滞回性对边坡坡脚的位移有很大的影响,尤其是在蒸发阶段,影响更加明显。分析表明:不考虑水力滞回性模型安全系数达到1.536,考虑了水力滞回性后安全系数为1.362 5,不考虑水力滞回性导致所得的边坡安全系数偏高,低估了边坡的风险性。 展开更多
关键词 非饱和土边坡 干湿循环 水力滞回性 安全系数
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土水特征曲线(SWCC)的滞回特性模拟研究 被引量:11
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作者 张雪东 赵成刚 +1 位作者 刘艳 蔡国庆 《工程地质学报》 CSCD 北大核心 2010年第6期920-925,共6页
为了模拟非饱和土的水力、力学特性在多次降雨、蒸发过程中的变化特性,本文以传统域模型的基本原理为基础,推到得到了一个能够模拟SWCC滞后性的计算模型,该模型计算方法简单,易于通过程序实现,且通过与试验数据和其他模型的计算结果对比... 为了模拟非饱和土的水力、力学特性在多次降雨、蒸发过程中的变化特性,本文以传统域模型的基本原理为基础,推到得到了一个能够模拟SWCC滞后性的计算模型,该模型计算方法简单,易于通过程序实现,且通过与试验数据和其他模型的计算结果对比,验证了该模型的合理性,同时,这个模型可为研究在复杂吸力变化状态下非饱和土的渗流特性、强度特性以及本构模型的研究打下一定的基础。 展开更多
关键词 非饱和土 土水特征曲线 域模型 滞回性
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拟黏滞摩擦阻尼器滞回特性及支撑内力分析 被引量:9
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作者 吴斌 张纪刚 欧进萍 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 2003年第7期834-838,843,849,共7页
从Pall型摩擦阻尼器四连杆机构的几何非线性变形特征出发,分析框架位移、支撑刚度、阻尼器摩擦力、阻尼器大小、支撑倾角、支撑屈曲力等对一种新型摩擦阻尼器——拟黏滞摩擦阻尼器的滞回特性及支撑受力特点的影响。分析结果表明拟黏滞... 从Pall型摩擦阻尼器四连杆机构的几何非线性变形特征出发,分析框架位移、支撑刚度、阻尼器摩擦力、阻尼器大小、支撑倾角、支撑屈曲力等对一种新型摩擦阻尼器——拟黏滞摩擦阻尼器的滞回特性及支撑受力特点的影响。分析结果表明拟黏滞摩擦阻尼器除了保留了Pall型摩擦阻尼器恢复力特性不受支撑屈曲力影响的优点外,支撑内力还比Pall型摩擦阻尼器明显降低,这将有利于提高框架柱的延性,减小框架柱在地震下的损伤。同时还拟合出可供设计人员使用的实用支撑最大内力计算公式。 展开更多
关键词 拟黏摩擦阻尼器 支撑屈曲力 支撑刚度 几何非线变形 滞回性 耗能减振技术 抗震 框架柱
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熔融织构高温超导球的磁悬浮滞回性质
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作者 刘戈 刘立伟 +1 位作者 张凯 周鲁卫 《复旦学报(自然科学版)》 CAS CSCD 北大核心 2001年第3期278-282,共5页
研究了悬浮于永磁圈之上的熔融织构 (MTG)高温超导球所受到的悬浮力的静态和动态性质 .通过实验 ,检查了悬浮力滞回性的物理本质 。
关键词 滞回性 超导磁悬浮 熔融织构 高温超导球
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不对称滞回振动系统频率俘获情况下的同步现象
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作者 张楠 陈志刚 +1 位作者 邱艳超 任吴晗 《机械设计与制造》 北大核心 2019年第5期265-267,272,共4页
对具有不对称滞回性的自同步振动系统在频率俘获情况下的同步特性进行研究。建立不对称滞回模型和具有不对称滞回特性的自同步振动系统的非线性动力学模型,利用Matlab/Simulink仿真呈现频率俘获情况下的系统双激振电机的同步运行和系统... 对具有不对称滞回性的自同步振动系统在频率俘获情况下的同步特性进行研究。建立不对称滞回模型和具有不对称滞回特性的自同步振动系统的非线性动力学模型,利用Matlab/Simulink仿真呈现频率俘获情况下的系统双激振电机的同步运行和系统的同步运行稳定特性。通过仿真分析系统可实现频率俘获现象以及在频率俘获情况下仍能实现同步特性。研究表明具有不对称滞回性的非线性振动系统仍能实现频率俘获情况下的双激振电机的同步运转和系统的同步稳定性。 展开更多
关键词 振动同步 自同步 不对称滞回性 频率俘获
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钢管混凝土梁柱节点受力性能的试验研究 被引量:3
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作者 刘立新 刘家慧 《郑州大学学报(工学版)》 CAS 2003年第3期1-5,共5页
钢筋混凝土梁与钢管混凝土柱节点的受力性能是影响钢管混凝土结构应用的关键问题.针对某电信枢纽中心的工程实践提出了穿心牛腿+环梁的新型节点构造形式,依据相似原理进行了静载及反复荷载下节点模型试验研究.试验研究表明,该节点传力... 钢筋混凝土梁与钢管混凝土柱节点的受力性能是影响钢管混凝土结构应用的关键问题.针对某电信枢纽中心的工程实践提出了穿心牛腿+环梁的新型节点构造形式,依据相似原理进行了静载及反复荷载下节点模型试验研究.试验研究表明,该节点传力路线明确,受力性能较好.根据试验结果改进后的新型节点已用于工程实践. 展开更多
关键词 钢管混凝土梁 节点 钢管混凝土柱 受力 工程试验 破坏形态 挠度 滞回性 环梁 穿心牛腿
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混凝土强度等级对剪力墙抗震性能的有限元分析 被引量:1
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作者 郭靳时 何建创 《吉林建筑大学学报》 2016年第2期1-3,共3页
剪力墙在高层建筑中是主要承担剪力的构件.利用Abaqus分别对C30,C35,C40混凝土强度的剪力墙进行有限元模拟,通过对3片剪力墙在低周反复荷载作用下的研究,分析剪力墙的滞回性、刚度变化、抗震性能方面的影响.分析表明,C35混凝土强度的剪... 剪力墙在高层建筑中是主要承担剪力的构件.利用Abaqus分别对C30,C35,C40混凝土强度的剪力墙进行有限元模拟,通过对3片剪力墙在低周反复荷载作用下的研究,分析剪力墙的滞回性、刚度变化、抗震性能方面的影响.分析表明,C35混凝土强度的剪力墙有更好的耗能能力. 展开更多
关键词 剪力墙 有限元 滞回性 耗能能力
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阿根廷失业的持续性:分地区的微观和宏观分析
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作者 Mariano Féliz Pablo Ernesto Pérez Demián Tupac Panigo 《世界经济文汇》 CSSCI 北大核心 2004年第2期1-20,共20页
本文旨在发展一个简单的方法来研究阿根廷各个地区失业的持续性。我们采用两个互补的视角 ,将宏观的 (加总 )回滞方法和微观的动态 (个人两阶段 )估计相结合。宏观分析的结果表明 ,大部分影响各地区和人口子集失业率的冲击都是显著持久... 本文旨在发展一个简单的方法来研究阿根廷各个地区失业的持续性。我们采用两个互补的视角 ,将宏观的 (加总 )回滞方法和微观的动态 (个人两阶段 )估计相结合。宏观分析的结果表明 ,大部分影响各地区和人口子集失业率的冲击都是显著持久的 (由于劳动参与和就业都有回滞性 (hysteresis) )。而另一方面 ,微观的分析则发现了明显的状态依赖 (state -dependence)效应 (存在于大部分地区的年轻人和妇女中 ) ,和一个仅在高失业率时才显著的时期依赖 (duration -dependence)效应。 展开更多
关键词 阿根廷 失业率 劳动力市场 公共政策 时期依赖效应 状态依赖效应 劳动参与率 持续
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多量程土压力盒标定工装及试验研究 被引量:5
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作者 尹紫红 赵丰年 +2 位作者 高雪 蒋良潍 苏谦 《西南交通大学学报》 EI CSCD 北大核心 2018年第6期1211-1219,共9页
为了精确获取土压力测试数据,总结了土压力盒标定工装研究现状,指出了现有标定工装存在通用性问题.针对多量程土压力盒标定,采用ABAQUS有限元软件建立了仿真模型,研究了承压板、标定桶的尺寸对土压力盒承压面受力的影响,基于提取的数据... 为了精确获取土压力测试数据,总结了土压力盒标定工装研究现状,指出了现有标定工装存在通用性问题.针对多量程土压力盒标定,采用ABAQUS有限元软件建立了仿真模型,研究了承压板、标定桶的尺寸对土压力盒承压面受力的影响,基于提取的数据进行合理性分析,确定了标定试验工装的参数及尺寸,并采用重新装砂、单次加卸载和不扰动砂、重复完全加卸载两种方案分别对量程为0.3、0.6、1.0、2.0 MPa的土压力盒进行了标定对比试验.结果表明:试验数据相关系数R2大于0.90,线性关联性较强,且试验组、对照组K值重复性较好,本次制定的工装可靠,试验数据正确合理,能够很好地标定多量程土压力盒;从重复加载、滞回性上分析,不扰动砂、重复完全加卸载方案数据相对稳定,建议该方案作为标定试验方案;砂标K1值小于厂标K2值,电阻应变式土压力盒在使用之前均要结合工程实际环境重新进行标定试验,以使参数更精确. 展开更多
关键词 土压力盒 滞回性 砂标 标定工装 标定系数
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岩石裂隙中水沙渗透滞后性的试验研究
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作者 韩雨 陈占清 彭刚 《湖南科技大学学报(自然科学版)》 CAS 北大核心 2017年第1期50-56,共7页
利用一种岩石裂隙水沙渗透试验系统开展了水沙在平面平行裂隙中流动的滞后性的试验研究,分析了渗流速度-压力梯度闭环曲线的特征,解释了滞后现象的原因.试验结果表明:当渗流速度由零增大到1.77 mm/s再减小到零时,渗流速度-压力梯度曲线... 利用一种岩石裂隙水沙渗透试验系统开展了水沙在平面平行裂隙中流动的滞后性的试验研究,分析了渗流速度-压力梯度闭环曲线的特征,解释了滞后现象的原因.试验结果表明:当渗流速度由零增大到1.77 mm/s再减小到零时,渗流速度-压力梯度曲线自行封闭,形成滞环;由于裂隙开度、粗糙度、沙粒径和沙浓度的不同,滞回曲线呈现凸镜形、月牙形、"8"字形、勺形和裂缝形等多种形状;水沙混合液与岩石裂隙面的接触角变化引起回程中渗透速度沿裂隙宽度方向分布变化,这是岩石裂隙中水沙渗透存在滞后现象的主要原因;沙粒在岩石裂隙面的沉积、水沙在岩石裂隙中运动形态的转变、水沙混合液的粘塑性是岩石裂隙中水沙渗透存在滞后现象的重要原因. 展开更多
关键词 滞回性 岩石裂隙 水沙混合液 渗透速度 渗流速度
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Seismic performance of double-skin steel-concrete composite box piers: Part Ⅱ—Nonlinear finite element analysis
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作者 夏坚 宗周红 +1 位作者 徐焯然 李明鸿 《Journal of Southeast University(English Edition)》 EI CAS 2016年第3期346-355,共10页
An accurate finite element ( FE) model was constructed to examine the hysteretic behavior of double-skin steel-concrete composite box ( DSCB) piers for further understanding the seismic performance of DSCB piers;... An accurate finite element ( FE) model was constructed to examine the hysteretic behavior of double-skin steel-concrete composite box ( DSCB) piers for further understanding the seismic performance of DSCB piers; where the local buckling behavior of steel tubes, the confinement of the in-filled concrete and the interface action between steel tube and in-filled concrete were considered. The accuracy of the proposed FE model was verified by the bidirectional cyclic loading test results. Based on the validated FE model, the effects of some key parameters, such as section width to steel thickness ratio, slenderness ratio, aspect ratio and axial load ratio on the hysteretic behavior of DSCB piers were investigated. Finally, the skeleton curve model of DSCB piers was proposed. The numerical simulation results reveal that the peak strength and elastic stiffness decrease with the increase of the section width to steel thickness ratio. Moreover, the increase of the slenderness ratio may result in a significant reduction in the peak strength and elastic stiffness while the ultimate displacement increases. The proposed skeleton curve model can be taken as a reference for seismic performance analyses of the DSCB piers. 展开更多
关键词 double-skin steel-concrete composite box(DSCB) pier finite element analysis local buckling hysteretic behavior skeleton curve model
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Evaluation of properties for a passive damping device with TiNi alloy rings as energy dissipating element
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作者 董寅生 熊九郎 +1 位作者 李爱群 林萍华 《Journal of Southeast University(English Edition)》 EI CAS 2005年第3期310-313,共4页
A new kind of passive damping device that is composed of TiNi shape memory alloy (SMA) rings is designed.The basic mechanical behaviors of the device are investigated and its damping capacity is analyzed.There still... A new kind of passive damping device that is composed of TiNi shape memory alloy (SMA) rings is designed.The basic mechanical behaviors of the device are investigated and its damping capacity is analyzed.There still exist hysteresis loops during loading and unloading when the deformation of the ring(s) is restricted in the horizontal direction properly,but the force-displacement curves are tilted and not parallel to the abscissa,which can improve the ability to withstand overloading.If there is no restriction,the force-displacement curves of the rings are near linear though the unloading paths are slightly different from those of loading.The basic mechanical and damping properties of the device may be changed by using different numbers of TiNi alloy rings,and the damping capacity will be increased markedly by increasing the number of rings. 展开更多
关键词 TINI shape memory alloy hysteresis loop damping property
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Seismic performance of double- skin steel- concrete composite box piers: Part Ⅰ——Bidirectional quasi-static testing 被引量:6
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作者 夏坚 宗周红 +1 位作者 徐焯然 李明鸿 《Journal of Southeast University(English Edition)》 EI CAS 2016年第1期58-66,共9页
To study the seismic performance of double-skin steelconcrete composite box( DSCB) piers, a total of 11 DSCB pier specimens were tested under bidirectional cyclic loading. The effects of the loading pattern, the ste... To study the seismic performance of double-skin steelconcrete composite box( DSCB) piers, a total of 11 DSCB pier specimens were tested under bidirectional cyclic loading. The effects of the loading pattern, the steel plate thickness, the axial load ratio, the slenderness ratio and the aspect ratio were taken into consideration. The damage evolution process and failure modes of the tested specimens are presented in detail. Test results are also discussed in terms of the hysteretic curve, skeleton curve, ductility and energy dissipation capacity of DSCB pier specimens. It can be concluded that the hysteretic performance of DSCB piers in one direction is affected and weakened by the cyclic loading in the other direction. DSCB piers under bidirectional cyclic loading exhibit good performance in terms of load carrying capacity, ductility, and energy dissipation capacity. Overall, DSCB piers can meet the basic aseismic requirements. The research results can be taken as a reference for using DSCB piers as high piers in bridges in strong earthquakeprone areas. 展开更多
关键词 double-skin steel-concrete composite box(DSCB) pier bidirectional quasi-static testing hysteretic curve skeleton curve ductility energy dissipation capacity
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Seismic behaviors of steel reinforced ECC/RC composite columns under low-cyclic loading 被引量:7
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作者 Pan Jinlong Mo Chuang +1 位作者 Xu Li Chen Junhan 《Journal of Southeast University(English Edition)》 EI CAS 2017年第1期70-78,共9页
To improve the seismic performance of columns, engineered cementitious composite (ECC) is introduced to partially substitute concrete at the base of the columns to form ECC,/reinforced concrete ( RC) composite col... To improve the seismic performance of columns, engineered cementitious composite (ECC) is introduced to partially substitute concrete at the base of the columns to form ECC,/reinforced concrete ( RC) composite columns. The mechanical behaviors of the ECC/RC composite columns are numerically studied under low-cyclic loading with the finite element analysis softwareof MSC. MARC. It is found that the ECC/RC composite columns can significantly enhance the load capacity, the ductility ad energy dissipation of columns. Then, the effects of the height of the ECC, the axial compression ratio and the longitudinal reinforcement ratio on the seismic behaviors of the composite columns are parametrically studied. The results show that the ECC/RC composite column with a height of the ECC layer of 0. Sh(h is the height to the cross-section) can achieve similar seismic performance of a full ECC column. The peak load of the composite column increases significantly while the ductility decreases with the increase of the axial compression ratio. Increasing the longitudinal reinforcement ratio within a certain range can improve the ductility and energy dissipation capacity and almost has no effect on load capacity. The aalysis results ae instructive and valuable for reference in designing ECC structures. 展开更多
关键词 engineered cementitious composites ECC) ECC/RC composite columns hysteretic curves DUCTILITY energy dissipation parametric analysis
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Adaptive Backstepping Control for Uncertain Systems with Compound Nonlinear Characteristics
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作者 LI Fei WANG Shimei +1 位作者 HU Jianbo LIU Bingqi 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2021年第2期249-258,共10页
An adaptive backstepping multi-sliding mode approximation variable structure control scheme is proposed for a class of uncertain nonlinear systems.An actuator model with compound nonlinear characteristics is establish... An adaptive backstepping multi-sliding mode approximation variable structure control scheme is proposed for a class of uncertain nonlinear systems.An actuator model with compound nonlinear characteristics is established based on the model decomposition method.The unmodeled dynamic term of the radial basis function neural network approximation system is presented.The Nussbaum gain design technique is utilized to overcome the problem that the control gain is unknown.The adaptive law estimation is used to estimate the upper boundary of neural network approximation and uncertain interference.The adaptive approximate variable structure control effectively weakens the control signal chattering while enhancing the robustness of the controller.Based on the Lyapunov stability theory,the stability of the entire control system is proved.The main advantage of the designed controller is that the compound nonlinear characteristics are considered and solved.Finally,simulation results are given to show the validity of the control scheme. 展开更多
关键词 compound nonlinearities SATURATION HYSTERESIS adaptive backstepping control radial basis function(RBF)neural network
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Experimental study of the pinned double rectangular tube assembled buckling-restrained brace 被引量:1
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作者 Zi-qin JIANG Yan-lin GUO +2 位作者 Ai-lin ZHANG Chao DOU Cai-xia ZHANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2017年第1期20-32,共13页
In this study, seven pinned double-rectangular tube assembled buckling-restrained brace (DRT-ABRB) specimens were experimentally charaeterised by means of an axial cyclic test. The core member of the specimens was a... In this study, seven pinned double-rectangular tube assembled buckling-restrained brace (DRT-ABRB) specimens were experimentally charaeterised by means of an axial cyclic test. The core member of the specimens was a single flat-plate. Two rectangular tubes were assembled using high strength bolts to form an external restraining member. Each rectangular tube was composed of an external steel channel and a cover plate. A gap or thin rubber filler was set between the core and the external restraining member to form an unbonded layer. The influence of several design parameters on the failure mode and energy dissipation capacity of the ABRB was investigated, including the height of the core wing plate, thickness of the external cover plate, and height of the external channel flange. This experimental study demonstrated that a local pressure-bearing failure at the end of the external member arises when the external cover plate is too thin or if the end construction detail is unreasonable. When the end rotations of the DRT-ABRB were restricted, the hysteretic performance was shown to be superior to that of a pure pinned DRT-ABRB. Finally, all the tested DRT-ABRBs exhibited excellent energy dissipation performance which amply satisfied existing regulation requirements. 展开更多
关键词 Double-rectangular tube assembled buckling-restrained brace (DRT-ABRB) Construction detail Hysteretic behaviour Failure mode High strength bolt
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