【作者】 吴培烽；

【导师】 季静；

【作者基本信息】 华南理工大学 ， 结构工程， 2010， 硕士

【摘要】 由于抗震理论研究的深入,计算手段的不断进步和建筑结构的日趋复杂等因素,线弹性理论已经不能完全满足工程实际的需要,整体结构的非线性分析已成为复杂结构设计的迫切要求。但因非线性分析理论较为复杂、计算手段欠缺等原因的限制,现阶段非线性分析在实际工程中的应用常常仅限于构件分析上。基于宏观单元的有限元法应用于结构整体非线性分析,有自由度少,计算时间短等优势,其结果能否满足工程应用的需求,还需通过试验结果来验证。本文对一个足尺七层钢筋混凝土剪力墙结构振动台试验进行模拟分析,采用三维空间非线性分析程序Perform-3D的剪力墙单元进行非线性分析,比较分析结果,并与试验结果对比,以研究Perform-3D的剪力墙单元应用于钢筋混凝土剪力墙结构非线性分析的计算精度。首先阐述了剪力墙模型的研究现状和Perform-3D程序的特点;对在美国加利福尼亚大学圣地亚哥分校进行的足尺七层钢筋混凝土剪力墙结构振动台试验进行模拟,根据振动台试验前的材料试验结果建立材料的本构关系,确定了剪力墙单元的材料本构关系;建立整体结构模型,进行了模态分析和线性时程分析,并与ETABS程序分析结果进行对比,验证整体模型的合理性。然后,对钢筋混凝土剪力墙结构模型进行了4条不同强度等级地震波作用下的动力分析,并讨论了剪力墙单元模型截面纤维的划分和单元网格细分问题。最后在某大型结构工程中运用Perform-3D程序进行分析。在小震和中震弹性分析基础上,采用Perform-3D对整体结构进行大震作用下弹塑性时程分析。弹性分析以及弹塑性分析的计算结果表明分析结果合理,塔楼结构具有很好的抗侧性能;设置粘滞阻尼器以后,整体结构满足变形要求,验证了设置阻尼器对结构抗震性能有着显著的提高效果。结果表明,基于Perform-3D的整体结构弹塑性分析可以用较少的自由度,很好地反映结构在各阶段地震力作用下的弹塑性行为,高效地完成整体结构非线性分析。可以认为,Perform-3D程序的剪力墙单元用于计算我国规范规定的7度和8度地震作用下的多、高层钢筋混凝土剪力墙结构,其结果是真实可靠的。更多还原

【Abstract】 Linear elastic analysis no longer meets the actual requirement of the fast development of seismic theory, architectural form, calculation means and so on. It is urgent to set up the inelastic analysis method in global structural analysis. Because of the complex and lack of tools, inelastic analysis is usually carried out on structural members only, but not for the global structure. Finite element method based on macro element,which has fewer degrees and effective computation, can be applied to global structural nonlinear analysis which has great prospect in engineering application. The results should be compared with tests to prove their accuracy.This paper presents the nonlinear analysis with shear wall element model by Perform-3D, which is a 3-dimensional nonlinear analysis software. The model is according to the full scale reinforced concrete shear wall structure shaking table test. Dynamic nonlinear analyses have been completed. Analysis results are compared with that of shaking table test to study the accuracy of nonlinear analysis of macro models.Firstly, the research situation of shear wall modals and characteristics of Perform-3D procedure are introduced. The process of the full scale reinforced concrete shear wall structure shaking table test is introduced, which was carried out in the University of California at San Diego. In order to build up the global model of the 7-story shear wall structure, material parameters are calibrated by simulating material tests, and element constitutions used in shear wall model are defined. Before the nonlinear time-history analysis is carried out, linear time-history analysis is conducted in both ETABS and Perform-3D to verify that Perform-3D models are reasonable. Secondly, dynamic nonlinear analysis model under 4 different intensity earthquakes are conducted respectively. Some issues about the number of fibers in element sections and the finite element mesh are discussed.Lastly, the practical application of Perform-3D procedure in an actual project is introduced. Based on the elastic analysis under frequent and moderate earthquake action, inelastic time history analysis under rare earthquake is carried out using Perform-3D. The analytical results are reasonable by comparing the analysis of elastic and elasto-plasticity., and indicate the adequate lateral performance of the towers. It can also be concluded that the damper can effectively improve the seismic performance of structures and reduce the nonlinear damage of the components.Compared with the experimental results, the analytical results confirm that the nonlinear analysis method based on shear wall element, which saves the computational costs due to fewer DOFs, can reflect inelastic behavior of structure. It is found that the shear wall element in Perform-3D procedure can be applied to global inelastic analysis for multiedstroy and high-rise reinforced concrete shear wall structures under earthquake actions in 7 and 8 degrees.更多还原