某大底盘多塔结构动力弹塑性时程分析

发布时间：2018-08-25 12:22

【摘要】：随着我国经济的快速发展,城市综合体建筑越来越多,大底盘多塔结构是综合体建筑常用的结构形式之一。这类结构体型庞大,动力特性复杂,大多数为超限高层建筑,其抗震性能研究具有重要意义。动力弹塑性时程分析是研究大底盘多塔结构抗震性能以及性能化设计的重要方法。因此,开展大底盘多塔结构的动力弹塑性时程分析研究具有重要意义。本文在如下几个方面进行了研究,取得了一些有价值的成果:(1)对结构动力弹塑性分析研究的进展进行了归纳总结,并对结构地震反应分析方法进行了简要回顾。(2)以大型通用有限元软件ABAQUS为平台,分析了钢筋混凝土结构时程分析的方法以及难点,包括单元、材料本构模型的选取、钢筋混凝土构件模拟方法等。对纤维梁单元方向点的确定方法进行了详细探讨,并给出了具体计算公式,并对该方法的可行性进行了验证。(3)总结了基于刚度法的钢筋混凝土纤维梁单元的原理,以及在ABAQUS中的实现方法,以现行混凝土结构设计规范中提出的本构模型为基础,编制了能够适用于纤维梁混凝土材料的VUMAT用户材料子程序。以地震波激励下的某钢筋混凝土框架为研究对象,验证了子程序的正确性及本文提出的钢筋混凝土构件模拟方法的可行性。(4)以某实际大底盘多塔结构工程为例,介绍了其抗震性能分析方法,包括:结构超限的判定等、针对结构超限的抗震措施及计算分析、针对框架剪力墙结构的二道防线分析及内力调整、以及性能化设计在该工程中的应用等内容。(5)基于ABAQUS对该结构进行了动力弹塑性时程分析,并对分析结果(包括结构位移、位移角、基底剪力等宏观指标,以及剪力墙累积受压损伤,框架柱的应变等微观指标)进行了讨论。研究结果表明,该结构满足“大震不倒”的抗震设防要求。
[Abstract]:With the rapid development of economy in China, more and more urban complex buildings have been built. This kind of structure is large in size and complex in dynamic characteristics, most of which are high rise buildings, so it is of great significance to study the seismic behavior of these structures. Dynamic elastoplastic time-history analysis is an important method to study the seismic performance and performance-based design of large chassis multi-tower structures. Therefore, it is of great significance to study the dynamic elastoplastic time history of large chassis multi-tower structures. In this paper, some valuable results are obtained in the following aspects: (1) the progress of dynamic elastoplastic analysis of structures is summarized. The seismic response analysis methods of structures are reviewed briefly. (2) the methods and difficulties of time history analysis of reinforced concrete structures, including the selection of element and material constitutive models, are analyzed on the platform of ABAQUS, a general finite element software. Simulation method of reinforced concrete member, etc. The method of determining the direction point of fiber beam element is discussed in detail, the concrete calculation formula is given, and the feasibility of this method is verified. (3) the principle of reinforced concrete fiber beam element based on stiffness method is summarized. Based on the constitutive model proposed in the current code for the design of concrete structures, a subprogram of VUMAT user materials suitable for fiber beam concrete materials is developed. Taking a reinforced concrete frame excited by seismic wave as an example, the correctness of the subroutine and the feasibility of the simulation method of reinforced concrete members proposed in this paper are verified. (4) taking a practical multi-tower structure project with large chassis as an example, This paper introduces the methods of seismic performance analysis, including the determination of the structure exceeding the limit, the seismic measures and calculation analysis for the structure exceeding the limit, the analysis of the two lines of defense and the adjustment of the internal force for the frame shear wall structure. And the application of performance-based design in the project. (5) the dynamic elastic-plastic time history analysis of the structure based on ABAQUS is carried out, and the results (including structural displacement, displacement angle, base shear force and so on) are analyzed. The accumulative compressive damage of shear wall and the strain of frame column are discussed. The results show that the structure meets the requirements of seismic fortification.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU973.31

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