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用桁架模型对斜拉桥桥面板断面进行面内非线性静态分析的简单方法
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作者 肖婧 《四川建筑》 2010年第4期138-140,共3页
梁的主要要素是用显示相同轴向和弯曲刚度的平面桁架来模拟的。用增量荷载法对梁结构的平面桁架模型采用非线性静态分析的计算机程序已研发出来。几何非线性由于大位移影响大的轴力,对相关的变形桁架用平衡方程解决。拟用桁架模型和计... 梁的主要要素是用显示相同轴向和弯曲刚度的平面桁架来模拟的。用增量荷载法对梁结构的平面桁架模型采用非线性静态分析的计算机程序已研发出来。几何非线性由于大位移影响大的轴力,对相关的变形桁架用平衡方程解决。拟用桁架模型和计算机程序显示简支梁的变形和反力,可以把它们应用到典型的中型斜拉桥桥面板断面的分析中。使用多索模型的时候,模型的每个索代表实际桥的一个索,理想模型可以精确地预测使用细长梁板断面的桥面。拟用桁架模型和计算机程序被证明是可靠的,可以用在斜拉桥的初步设计中。 展开更多
关键词 斜拉桥 平面桁架模型 非线性静态分析 多索模型
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钢结构同心斜撑构架简化模型的静动态分析 被引量:1
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作者 王志博 《建筑技术开发》 2017年第10期16-18,共3页
通过研究使用PISA3D非线性分析软件来建立3层楼与6层楼典型钢结构同心斜撑构架的简化模型,以Fishbone及本研究提出的Brace-Column作为简化方式,透过非线性静态侧推分析(pushover)及非线性动力分析结果,比较不同模型的楼层位移、加速度... 通过研究使用PISA3D非线性分析软件来建立3层楼与6层楼典型钢结构同心斜撑构架的简化模型,以Fishbone及本研究提出的Brace-Column作为简化方式,透过非线性静态侧推分析(pushover)及非线性动力分析结果,比较不同模型的楼层位移、加速度、迟滞消能行为等参数,探讨简化模型的精确度。 展开更多
关键词 钢结构同心斜撑构架 简化模型 非线性静态侧推分析 非线性动力分析
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太阳帆航天器姿态控制滚转轴稳定机设计 被引量:2
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作者 马鑫 杨萱 +2 位作者 杨辰 钱航 郑龙飞 《红外与激光工程》 EI CSCD 北大核心 2014年第B12期72-77,共6页
针对一种具体的由支撑臂支撑、方形帆面形式的太阳帆航天器,介绍了质心偏移类、帆面转动类两大类姿态控制机构,并分析了其优缺点,对其适用的姿态控制滚转轴稳定机进行了设计。在构型设计、材料强度、结构强度、质量优化、控制精度等设... 针对一种具体的由支撑臂支撑、方形帆面形式的太阳帆航天器,介绍了质心偏移类、帆面转动类两大类姿态控制机构,并分析了其优缺点,对其适用的姿态控制滚转轴稳定机进行了设计。在构型设计、材料强度、结构强度、质量优化、控制精度等设计约束条件下,围绕滚转轴稳定机转杆长度关键设计参数,通过分析长度角度制约关系、几何计算、帆面有限元非线性静态建模仿真验证、伸展臂弯曲受力有限元建模仿真验证给出了转杆长度值的优化设计结果为1.2 m,并以此为依据结合功率、转速公式计算选取了合理的极限转速取值为20.83(°)/s。给出了一种滚转轴稳定机转杆长度优化设计思路,为太阳帆航天器姿态控制方案设计提供了关键设计参数与设计约束条件,优化设计结果对实际工程应用具有一定参考价值。 展开更多
关键词 太阳帆 姿态控制机构 滚转轴稳定机 有限元 非线性静态分析
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基于有限元法的磁流变阻尼器三维仿真研究 被引量:5
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作者 李军强 臧希喆 赵杰 《系统仿真学报》 CAS CSCD 北大核心 2009年第17期5594-5596,5601,共4页
针对所设计的磁流变阻尼器结构特点,应用有限元软件ANSYS提供的参数化设计语言,建立了阻尼器的1/16三维结构模型,基于磁流变液与磁芯材料具有不同的非线性磁导特性的特点,应用基于单元边法的Solid117单元建立了阻尼器的有限元模型,进行... 针对所设计的磁流变阻尼器结构特点,应用有限元软件ANSYS提供的参数化设计语言,建立了阻尼器的1/16三维结构模型,基于磁流变液与磁芯材料具有不同的非线性磁导特性的特点,应用基于单元边法的Solid117单元建立了阻尼器的有限元模型,进行了三维静态非线性电磁场分析,在后处理器中,通过求得工作区域内平均磁场强度与磁感应强度的方法,获得了阻尼器的屈服力矩特性与漏磁系数等关键参数。 展开更多
关键词 有限元法 磁流变阻尼器 参数化设计 三维静态非线性电磁场分析
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Seismic Assessment of Asymmetric Structures Behaviour by Using Static Non-linear Analysis
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作者 Ivana Marino Luigi Petti 《Journal of Civil Engineering and Architecture》 2011年第5期402-411,共10页
The goal of this work is to investigate the seismic behaviour of plan-asymmetric structures by considering the least seismic-resistant directions and the spatial features of the seismic event. New tools for the analys... The goal of this work is to investigate the seismic behaviour of plan-asymmetric structures by considering the least seismic-resistant directions and the spatial features of the seismic event. New tools for the analysis of the seismic behaviour of plan-asymmetric structures are herein presented and the concepts of "Polar Spectrum" and limit domains are discussed. In particular, the capacity of the structure is described by using the limit domains based on the Non Linear Static Procedures, while the seismic demand is analysed by introducing a new representation of the spectral response. This representation is based on the construction of a spectral surface obtained by the spectral seismic response for different in-plan directions and the in-plan projection of this surface is herein defined "Polar Spectrum". The obtained results for two benchmark structures, verified by means of non-linear incremental dynamic analyses, have pointed out that non-linear static analyses, carried out for different in-plan directions of the incoming seismic action, have allowed us to accurately evaluate the least seismic resistant directions. 展开更多
关键词 Plan-asymmetric structures non-linear analyses polar spectrum.
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精密定位胀销的设计研究
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作者 王柏松 《机械工程师》 2014年第3期244-247,共4页
定位胀销结构形式简单,用于油缸两端铰耳、连杆两端铰耳等旋转铰接部位,实现无间隙紧密定位,可靠性高。文中对定位胀销的结构原理进行了详细分析。利用Ansys workbench对定位胀销的强度进行了非线性静态结构分析。
关键词 定位胀销 结构原理 非线性静态结构分析
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Static and Buckling Analysis of Concrete Spherical Shells
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作者 Ivana Mekjavic 《Journal of Civil Engineering and Architecture》 2012年第7期899-905,共7页
A finite element analysis, including static and buckling analysis is presented for several notable concrete spherical shells around the world. Also, the structural optimization study of these shells was performed for ... A finite element analysis, including static and buckling analysis is presented for several notable concrete spherical shells around the world. Also, the structural optimization study of these shells was performed for thickness distribution and structure shape to reduce overall tensile stress, deflection and reinforcements. The finite element analysis using Sofistik software shows that a distributed concrete thickness reduces shell stresses, deflections and reinforcements. A geometrically non-linear analysis of these structures with and without imperfections was also performed. To take into account the possible plastification of the material an analysis with non-linear material was performed simultaneously with the geometrically non-linear analysis. This helps in developing an understanding of the structural behaviour and helps to identify all potential failure causes using failure analysis. 展开更多
关键词 Static analysis buckling analysis structural optimization concrete shells spherical shells.
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Stability Analysis of Cylindrical Tanks under Static and Earthquake Loading
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作者 Sukhvarsh Jerath Mark Lee 《Journal of Civil Engineering and Architecture》 2015年第1期72-79,共8页
Large thin walled cylindrical above ground tanks have become more susceptible to failure by buckling during earthquakes. In this study, three different geometries of tanks with H/D (height to diameter) ratios of 2.0... Large thin walled cylindrical above ground tanks have become more susceptible to failure by buckling during earthquakes. In this study, three different geometries of tanks with H/D (height to diameter) ratios of 2.0, 0.56, 1.0, and D/t (depth to thickness) ratios of 960.0, 1,706.67 and 640.0 respectively were analyzed for stability when subjected to the E1 Centro earthquake at the base. The Budiansky and Roth procedure was used to find the buckling loads when the tanks were empty and when they were filled with liquid up to 90% of their depth. Also, nonlinear time history analysis using ANSYS finite element computer program was performed. Analysis results show that the dynamic buckling occurs for empty tanks at very high PGA (peak ground accelerations) which are unrealistic even for major earthquakes. Furthermore, when the tanks filled with water up to 90% of its height, analysis results show that when the H/D ratio reduced by two times (i.e., from 2 to 1), the PGA for the buckling increased by six times (increase from 0.25g to 1 .Sg). Hence, H/D ratio plays an important role in the earthquake stability design of over ground steel tanks. 展开更多
关键词 Dynamic stability earthquake loads static buckling storage tanks structure fluid interaction.
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Seismic Performance of Bridges with Different Pier Heights: Longitudinal Analysis of an Existing Bridge
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作者 Joao Coimbra Sampayo Carlos Sousa Oliveira 《Journal of Civil Engineering and Architecture》 2015年第6期635-643,共9页
This paper is dedicated to the study of the seismic performance of an existing RC (reinforced concrete) bridge localized in a region of moderate seismicity. The bridge has six spans and piers with very different hei... This paper is dedicated to the study of the seismic performance of an existing RC (reinforced concrete) bridge localized in a region of moderate seismicity. The bridge has six spans and piers with very different heights, three of which are monolithically connected to the deck. To understand the roles of the different pier sizes in the overall behavior, several analyses were carried out in the longitudinal direction: (1) linear dynamic approach; (2) non-linear static approach; (3) non-linear dynamic approach. Linear dynamic analysis was made in order to design the bridge for the ultimate limit state considering the largest value of the ductility factor. No safety verification was made for the other loads. Using non-linear static analyses, sensitivity was performed to check the influence of reinforcement quantities of each pier on the overall behavior of the bridge under Lisbon seismic action. For the non-linear dynamic approach, a series of strong motion records compatible with the EC-8 spectrum for Lisbon area were generated. The very same combinations of reinforcement quantities were studied. Comparisons between static and dynamic non-linear analysis were made to confirm the validity of the first one in the case under analysis, where the period of vibration is quite high. 展开更多
关键词 RC bridge seismic behavior linear methods non-linear methods.
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