不同地震水准下某塔楼墙肢薄弱部位分布研究

Study on distribution of weak parts of a tower walls under different earthquake levels

筒体剪力墙是框架-核心筒的第一道抗震防线,确定墙体的损伤分布是抗震性能化设计的重要组成部分。以某型钢混凝土框架-混凝土双筒结构为例,采用YJK软件进行整体结构小震与中震反应谱性能设计,采用ABAQUS软件进行大震及超大震的动力时程分析。分析结果表明:小震作用时,筒体墙肢承担超过90%的楼层地震剪力;中震作用时,底部局部墙肢出现受拉;大震作用下,受高阶振型影响,结构中上部墙肢损伤较底部的大;超大震作用下,结构墙肢损伤演变过程表明中上部墙肢先出现损伤,后底部墙肢开始出现破坏,当周围墙肢出现损坏时结构呈倒塌破坏状态,其中墙肢出现的破坏部位同中震结果是一致的,可见不同地震水准间反映的结构薄弱部位还是能起到相互验证的作用,结果也较为可信。分析结果还表明针对薄弱部位采取的加强措施是有效、可行的。

The tube shear wall is the first seismic fortification line of the frame corewall,and it is an important part of the performance-based seismic design to determine the damage distribution of the wall. A steel reinforced concrete frame-concrete double tube structure was taken as an example,and the YJK software were used to conduct structural overall design under frequent earthquake and response spectrum performance design under moderate earthquake,and the ABAQUS software was used to conduct dynamic time-history analysis under rare and super-rare earthquakes. The analysis results show that under frequent earthquake,tube walls bear more than 90% of floor seismic shear forces; tension appears in local wall at the bottom of shear wall under moderate earthquake; under the influence of high modes,wall damage in the middle and upper parts of structure is larger than that at the bottom of the wall under rare earthquake; under super-rare earthquake,damage evolution process of structural wall indicates that there is damage in the upper and middle parts of walls before damage appears in bottom walls,and the structure features a collapse failure state when surrounding walls are damaged,where failure location in walls are identical to that under moderate earthquake. It shows that structural weak parts reflected by different earthquake levels can verify each other,and the results are believable. The analysis results also show that the strengthening measures adopted for the weak parts are effective and feasible.