基于动力弹塑性分析的内置双向钢骨混凝土组合墙抗震性能研究

Study on seismic performance of concrete composite wall with built-in bidirectional steel frame based on dynamic elastic-plastic analysis

钢板混凝土组合墙能充分发挥钢材的材料优势,抗震性能优越,但在工程应用中存在施工难度较大的问题。本文研究的内置双向钢骨混凝土组合墙,墙内为水平向和竖向相交的钢骨,具有施工效率更高、施工成本更低的特点。与钢板混凝土组合墙相比,内置双向钢骨混凝土组合墙的研究成果较少,其抗震性能没有得到充分验证。本文选取了原设计为钢板混凝土组合墙的工程实例,将其中的钢板混凝土组合墙替换为含钢率相近的内置双向钢骨混凝土组合墙,使用通用有限元软件对4个算例进行罕遇地震作用下的动力弹塑性分析,对比两种不同形式组合墙对结构整体抗震性能及组合墙自身性能的影响。经研究发现,内置双向钢骨混凝土组合墙的混凝土受压损伤水平和损伤范围略微偏大,构件承载力略低于钢板混凝土组合墙;将结构中钢板混凝土组合墙替换为内置双向钢骨混凝土组合墙,对结构在罕遇地震作用下的自振特性、弹塑性动力响应和构件损伤的影响较小,结构仍能满足大震不倒的性能要求。

The steel plate concrete composite shear walls give full play to the material advantages of steel,exhibiting excellent seismic performance,but causing significant construction difficulties in engineering applications.The concrete composite wall with built-in bidirectional steel frame studied in this article are concrete walls with horizontal and vertical steel frames intersected inside,which show characteristics of higher construction efficiency and lower construction cost.Compared with the steel plate concrete composite walls,there are few research results on the concrete composite wall with built-in bidirectional steel frame,and their seismic performance has not been researched sufficiently.In this article,an engineering example originally using steel plate-concrete composite walls is selected,and the steel plate-concrete composite walls in the example are replaced with concrete composite wall with built-in bidirectional steel frame with a similar steel ratio.The universal finite element software is used to perform dynamic elastic-plastic analysis on four examples under rare earthquake conditions,comparing the seismic performance differences of the overall structure and two different forms of composite walls themselves.It is found that the concrete composite wall with built-in bidirectional steel frame has higher compressive damage levels and a larger damage range,and its bearing capacity is lower than that of steel plate-concrete composite walls.Replacing the steel plate-concrete composite wall in the structure with a concrete composite wall with built-in bidirectional steel frame has a small impact on the natural vibration characteristics,the elastoplastic dynamic response and the damage of the components.The structure can still meet the performance requirements of not collapsing during strong earthquakes.