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空间桁架非线性动力反应及例塌分析 总被引:1,自引:0,他引:1
本文对空间杵架线性及非线性动力反应进行了研究。通过Newmark数值积分稳定性的推导,结合结构的倒塌机理,提出了判定结构动力倒塌的双重判定准则,分析了北京机场机库结构弹性的弹塑性的地震反应,以及结构在强震下倒塌的全过程。 相似文献
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结合平寨特大桥工程实例,运用反应谱浃和动力时程分析法对此进行了研究。对反应谱、一致激励、行波输入得出的结果进行比较,研究结果表明,时程分析结果较反应谱更接近实际情况,行波输入时竖向分量的影响较一致激励不利。 相似文献
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提出了随机结构非线性动力反应分析的概率密度演化方法.根据结构动力反应的随机状态方程,引入扩展状态向量,建立了随机结构非线性动力反应的概率密度演化方程.以单自由度保守系统的非线性自由振动为例,分析了反应的概率密度演化.研究表明随机结构非线性动力反应概率密度具有典型的演化特征,通过与精确解答和Monte Carlo分析结果的对比表明本文建议的概率密度演化方法具有良好的计算精度和较小的计算工作量. 相似文献
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本文针对目前国内尚无完整的地上动力管线抗震设计规范和抗震鉴定标准的现状,结合国情,就动力管道在不同荷载条件下的容许应力取值,管道的强度和变形验算准则等诸多问题进行了深入分析研究,并成功地应用于宝钢大型地上动力管线地震反应分析项目。 相似文献
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软土地层地铁及地下构筑物抗震动力分析研究现状 总被引:1,自引:0,他引:1
从软土的动力特性、土 结构动力相互作用、软土地基的动力反应分析和地下结构动力可靠度计算等方面 ,介绍了国内外软土地层中地下构筑物的抗震动力分析研究情况。并介绍了笔者在这方面的一些研究成果 相似文献
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HUANG Minshui ZHU Hongping LI Lin GUO Wenzeng 《Frontiers of Structural and Civil Engineering》2008,2(2):139
The dynamic characteristics of bridge structures are the basis of structural dynamic response and seismic analysis, and are also an important target of health condition monitoring. In this paper, a three-dimensional finite-element model is first established for a highway bridge over a railroad on No.312 National Highway. Based on design drawings, the dynamic characteristics of the bridge are studied using finite element analysis and ambient vibration measurements. Thus, a set of data is selected based on sensitivity analysis and optimization theory; the finite element model of the bridge is updated. The numerical and experimental results show that the updated method is more simple and effective, the updated finite element model can reflect the dynamic characteristics of the bridge better, and it can be used to predict the dynamic response under complex external forces. It is also helpful for further damage identification and health condition monitoring. 相似文献
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城市高架桥动力特性研究 总被引:1,自引:0,他引:1
桥梁结构的动力特性就是结构振动的基本特性,是对桥梁结构进行地震反应分析的基础.因此,对高烈度地区城市高架桥动力特性进行试验和理论研究很有必要.本文以高架桥常见的结构形式桥面连续简支梁结构为例,建立三维有限元模型,进行了模态分析并与试验结果进行对比分析.其结论可为同类型桥梁结构进行设计和分析作为参考. 相似文献
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论述了桥梁抗震设计的必要性,对桥梁结构动力反映谱分析的原理进行了说明,以实际算例验证了运用Midas/Civil对斜拉桥进行动力反映谱分析设计的可行性. 相似文献
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《Journal of Wind Engineering & Industrial Aerodynamics》2004,92(7-8):579-607
This paper presents a framework of dynamic analysis of coupled three-dimensional vehicle–bridge system under strong winds. A general formulation of this system is introduced to simulate a series of vehicles consisting of different numbers and different types of vehicles running on bridges under hurricane-induced strong winds. Each vehicle is modeled as a combination of several rigid bodies, axle mass blocks, springs, and dampers, considering wind and road roughness loads. With this vehicle–bridge model, coupled dynamic analysis of vehicles running on bridges is conducted with a numerical example. Effects of driving speeds on the dynamic performance of the vehicles as well as the bridge are discussed. It is found that the driving speeds mainly affect the vehicle's vertical relative response while they have insignificant effect on the rolling response of vehicles. Vehicle's absolute response is dominated by the bridge response when wind speed is high, while it is dominated by road roughness when the wind speed is low. Detailed accident analysis of vehicles on bridges under strong winds will be reported in an accompanying paper. 相似文献
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通过建立高速列车与斜拉拱桥的车桥耦合动力分析模型,运用桥梁结构动力学与车辆动力学的研究方法进行动力特性计算,并对斜拉拱桥在高速列车作用下的车桥动力响应进行了分析,验证了高速列车通过斜拉拱桥时的走行安全性与乘坐舒适性。 相似文献