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船舶碰撞动力响应有限元模拟 总被引:1,自引:0,他引:1
分析比较了我国《铁路桥涵设计规范》、美国AASHTO《公路桥梁设计规范》和《欧洲统一规范2.7分册》中船撞力计算公式。利用有限元软件Ls-DYNA创建不同重量、不同类型的船舶有限元模型,模拟船舶与刚性墙的正面碰撞过程,将数值模拟得到最大船撞力与各规范计算结果比较,研究表明数值模拟得到最大船撞力与美国规范和欧洲规范的计算结果相近;最大船撞力和船舶重量的开方基本呈成正比关系;相同重量而类型不同的船舶由于船艏形状不同,所得的船撞力时程曲线不同,对应最大船撞力也不相同。 相似文献
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基于Biot两相饱和多孔介质动力耦合理论,采用有效应力方法对液化场地桩基础的地震反应进行了三维有限元分析。在饱和液化砂土的循环塑性模拟中,采用了超固结边界面、Armstrong-Frederick型非线性运动硬化准则和非关联流动准则来描述动荷载作用下砂土的循环活动性以及液化强度等特性。对于桩的动力本构行为,则采用了可以考虑体积效应和轴向力影响的梁-柱单元来模拟。以某城市高架桥的实际工程为例,应用该方法对地基液化时桩-土-结构的动力相互作用进行了计算分析,并得到了一些有用的结论。 相似文献
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进行了框架—剪力墙结构的地震响应有限元分析,从强度和变形两方面来检验框架—剪力墙结构的安全和抗震可靠度;通过对结构进行模态分析,得出了结构的抗剪承载能力和储备,该方法对框架—剪力墙结构体系的分析设计具有一定的指导意义。 相似文献
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研究了某铁路连续钢桁梁桥在7级近源地震作用下桥梁跨中节点的动力响应,经有限元模拟计算,验证了该桥具有良好的抗震性能,以保证该连续钢桁架桥结构安全. 相似文献
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以江西某铜矿大型驱动站为背景,采用ANSYS软件建立了全尺寸结构模型,对放置大型动力设备的楼板进行了各运行工况下的静力及动力响应分析,验证了结构的可靠性,并探讨了由于设备振动引起的结构振动的规律,为类似的工程提供参考。 相似文献
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运用大型结构分析程序Midas/Civil在地震波作用下,对某一实际高墩大跨连续刚构桥的地震反应进行了数值模拟,并利用反应谱分析法分析了高墩大跨连续刚构桥在不同作用方向地震波作用下的内力变化,从而为剐构桥的抗震设计奠定了基础。 相似文献
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Li Liang Du Xiuli Li Liyun Zhao Chenggang 《Frontiers of Architecture and Civil Engineering in China》2007,1(4):436-442
In order to describe the elasto-plastic dynamic response of fluid-saturated porous media, the incremental elasto-plastic wave
propagation equations of fluid-saturated porous media are developed by the fundamental theory of continuum mechanics and appointing
to the characteristic of fluid-saturated porous media. Then, the space discretization of these equations is performed to get
their Galerkin formula. At last, the time discretization of this formula is carried out with the integral method which consists
of central difference method and Newmark constant average acceleration method to get the explicit time integral formula for
solving the wave propagation equations of porous media. On the basis of the integral formula mentioned above, the time-domain
explicit finite element method is developed for calculation and analysis of the elasto-plastic dynamic response of fluid-saturated
porous media. In this method, the decoupling technique is adopted and it does not need to solve simultaneous linear equations
in each time step, so the computational effort and memory requirement can be reduced considerably by using this method.
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Translated from Journal of Beijing University of Technology, 2006, 32(9): 785–790 [译自: 北京工业大学学报] 相似文献
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This paper presents a method for the analysis of the response of periodic frame—wall systems to earthquake excitations modelled as stationary random or evolutionary random processes. The transfer matrix required by the analysis, together with its powers is provided directly, thus avoiding calculation of the left and right-hand eigenvectors of the transfer matrix and eliminating computations for the evaluation of all its powers. It is shown how the method can be applied to structures that are only piecewise periodic and how results can be obtained for the static case. Finally, it is shown how the method may be used for both deterministic and probabilistic analyses. 相似文献
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利用有限元分析了支盘桩的特点和荷载传递规律,研究了承载盘的位置、数量、形状、间距、盘径、盘高、土的性质及地下水位对受压支盘桩单桩受力性能的影响,通过研究发现,下部盘的承载潜力一般要大于上部盘,下部承力盘就承受着较大的荷载,应尽量将支盘设在较深处,支盘桩的盘间距不应小于临界支盘间距,支盘形状对桩的受力影响较小,盘径和盘高越大,桩承载力越高,盘径比盘高的影响要大一些,随着土体模量、内摩擦角、粘聚力、土体重度等的增大,支盘桩的承载力随之增大,地下水位越深,支盘桩的承载力越大。 相似文献
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Mohammed S. Al-Ansari 《土木工程与建筑:英文版》2009,(3):16-22
This paper studies and analyzes the response of helical stairs as helicoidal shells in earthquake zones. The response of helical stairs under gravity loads was analyzed by both the membrane theory and finite element methods. The non-linear response of helical stairs, when subjected to UBC (Uniform Building Code) dynamic and static equivalent earthquake loads, were obtained using finite element models. These responses were compiled and analyzed in order to draw recommendations for the preliminary design of helical stairs in earthquake zones. The analysis of the results obtained showed that helical stairs are stiffer and lighter than regular ones. 相似文献