单层短肢剪力墙抗侧力体系弹塑性分析

ELASTIC-PLASTIC ANALYSIS IN SIMULATION TEST OF ONE-STORY SHORT-LEG SHEAR WALL STRUCTURE

通过单调加载方式利用ANSYS有限元程序仿真分析了T形单层短肢剪力墙结构体系从弹性应力状态到混凝土开裂直到破坏的全过程。在拟静力试验中,分别考虑了影响短肢剪力墙受力的墙肢截面高厚比、混凝土强度等级、连梁跨高比、轴压比等因素对短肢剪力墙承载力和变形的影响。试验结果表明:截面的墙肢高厚比由实际情况所决定,墙肢高厚比增加,其开裂和极限荷载会增加,且极限荷载增加速度比开裂荷载快。连梁的跨高比对试件的极限荷载的大小影响比较复杂,通过增加轴压比的方法提高试件极限荷载,比通过改变其他因素的方法更加有效。对短肢剪力墙截面正应力和剪应力分布规律进行了深入细致的探讨,结果表明:翼缘正应力分布曲线基本上符合三次抛物线形状分布,腹板上的剪力流呈反对称分布。另外,腹板上的剪力流的分布形态基本不受构件肢长变化的影响。

Based on computer simulation theory and ANSYS finite element analysis method,the static experiment in simulation test was done on T-shaped one-story of short-leg shear wall to research the concrete from elastic to collapse.In static test,the factors influencing the forced behavior of the shear wall were considered,such as sectional depth to thickness ratio,concrete strength grades,couple beams span to depth ratio,ratio of axial compression of section.The anlysis shows that the crack load and ultimate load are increased with the increasement of the sectional depth to thickness ratio.Couple beams span to depth ratio is complex to the load-carrying capacity,howerer,ratio of axial compression of section is relatively effective to the load-carrying capacity in comparison with other factors.The sectional stress distribution is deeply and detailedly researched.The result shows that the normal stress distribution is in accord with cubic curve and shear stress of the web plate is antisymmetric.The sectional shear-stress distribution is not affected by the change of length of short-leg shear wall.