基于OpenSees的双层钢板混凝土组合剪力墙抗震性能研究

发布时间：2019-05-24 15:29

【摘要】：超高层建筑结构的剪力墙往往要承受极大的竖向荷载和地震作用,但传统的钢筋混凝土剪力墙承载力不高、变形能力小、延性差,在当前情形下已难以满足工程需求。双层钢板混凝土组合剪力墙因其具有承载力高、耗能能力强、延性好等优点,可以满足超高层建筑中结构构件的高性能要求。目前国内外双层钢板混凝土组合剪力墙震害实例基本没有,试验研究的数量也不多。因此有必要来对双层钢板混凝土组合剪力墙的抗震性能进行分析和探讨。本文采用纤维截面模型叠加剪切弹簧考虑剪切效应,基于OpenSees程序,建立了双层钢板混凝土组合剪力墙在低周往复荷载作用下的有限元分析模型。利用试验结果论证了有限元分析模型的准确性和可靠性。在此基础上,分析混凝土强度等级、钢板屈服强度、含钢率、端柱与墙身钢板比例等关键因素对组合墙抗震性能的影响。在分析数据的基础上,给出了双层钢板混凝土组合剪力墙构造设计建议和抗剪承载力计算公式。本文研究的主要结论如下:1.随着混凝土强度等级的提高,组合墙抗侧刚度和极限承载力提升明显。在约束拉杆、钢板、端柱钢管等合理布置的前提下,高强混凝土与钢板共同工作且耗能能力和延性良好,可以极好地发挥其高强度。2.随着钢板屈服强度的提升,钢板屈服强度和极限承载力呈现线性增长,达到极限承载力之后,刚度退化几乎相同。3.组合墙截面含钢率的提高直接导致钢板厚度增加,而钢板厚度变大能直接提高钢板提供的剪力贡献值。同时钢板对混凝土约束作用也在一定程度上提升,从而混凝土抗剪承载力随之提高。含钢率由8.8%增大到12.4%时,含钢率与极限承载力几乎成线性增长,含钢率超过12.4%后,承载力增长明显放缓。4.端柱和墙身钢板比例tz/tw对组合墙耗能能力、极限承载力和延性均有一定的影响,在其他条件相同情况下,tz/tw为2.0时组合墙的抗震性能表现最佳。5.通过有限元计算数据的回归分析,在已有公式的基础上修正了钢板项和混凝土项系数,提出了双层钢板混凝土组合剪力墙抗剪承载力计算公式。
[Abstract]:The shear wall of super high-rise building structure is often subjected to great vertical load and seismic action, but the traditional reinforced concrete shear wall has low bearing capacity, small deformation capacity and poor plasticity, so it is difficult to meet the engineering needs under the current situation. Double-deck steel plate concrete composite shear wall can meet the high performance requirements of structural members in super high-rise buildings because of its high bearing capacity, strong energy consumption capacity, good ductility and so on. At present, there are no earthquake damage examples of double-layer steel plate concrete composite shear wall at home and abroad, and the number of experimental research is not many. Therefore, it is necessary to analyze and discuss the seismic performance of double-layer steel plate concrete composite shear wall. In this paper, the fiber section model superimposed shear spring is used to consider the shear effect. Based on OpenSees program, the finite element analysis model of double-layer steel plate concrete composite shear wall under low cyclic reciprocating load is established. The accuracy and reliability of the finite element analysis model are demonstrated by the test results. On this basis, the influence of key factors, such as concrete strength grade, steel plate yield strength, steel content and the ratio of end column to wall body steel plate, on the seismic performance of composite wall is analyzed. Based on the analysis of the data, the structural design suggestions and the calculation formula of shear capacity of double-layer steel plate concrete composite shear wall are given. The main conclusions of this paper are as follows: 1. With the improvement of concrete strength grade, the lateral stiffness and ultimate bearing capacity of composite walls are improved obviously. Under the premise of reasonable arrangement of restrained pull rod, steel plate, end column steel pipe and so on, high strength concrete and steel plate work together and have good energy dissipation capacity and toughness, so they can give full play to their high strength. 2. With the increase of yield strength of steel plate, the yield strength and ultimate bearing capacity of steel plate increase linearly, and after reaching the ultimate bearing capacity, the stiffness degradation is almost the same. 3. The increase of steel content of composite wall section directly leads to the increase of steel plate thickness, and the increase of steel plate thickness can directly increase the shear contribution value provided by steel plate. At the same time, the restraint effect of steel plate on concrete is also improved to a certain extent, so the shear capacity of concrete is improved. When the steel content increases from 8.8% to 12.4%, the steel content and ultimate bearing capacity increase almost linearly. When the steel content exceeds 12.4%, the increase of bearing capacity slows down obviously. The ratio of end column to wall body steel plate tz/tw has certain influence on the energy dissipation capacity, ultimate bearing capacity and toughness of the composite wall. Under the same other conditions, the seismic performance of the composite wall is the best when tz/tw is 2.0. 5. Based on the regression analysis of finite element calculation data, the steel plate term and concrete term coefficient are modified on the basis of the existing formulas, and the formula for calculating the shear capacity of double-layer steel plate concrete composite shear wall is put forward.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9;TU352.11

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