对称双肢短肢剪力墙的拟静力试验研究

介绍了5榀肢强系数不同,整体性系数相同,墙肢为T形截面的8层对称双肢短肢剪力墙在竖向力和反复水平力共同作用下的模型试验。试验结果表明,短肢剪力墙有很好的抗震性能,墙肢没有反弯点,具有强墙肢弱连梁的特点,当墙肢愈强时,即肢强系数愈小时,其侧向刚度、承载力愈大,但延性有所降低。可见,短肢剪力墙的受力性能与联肢剪力墙是一致的,因此本文认为,《高层建筑混凝土结构技术规程》(JGJ 3-2002)把短肢剪力墙的抗震等级提高一级的规定是没有必要的。同时试验结果也进一步验证了短肢剪力墙的定义,并指出我国《高层建筑混凝土结构技术规程》(JGJ 3-2002)中将墙肢截面高厚比为5~8的剪力墙定义为短肢剪力墙的定义不够准确。

Quasi-static test research of symmetric double short-limb shear walls

The paper introduced the test of 5 specimens of 8-story symmetric shear walls with two short limbs in which the whole coefficients were similar but the limb strong coefficients were different.In the test,specimens are subject to the combined action of vertical loading and repeated horizontal loading.The test results show that short-limb shear walls possess good aseismatic behavior without showing any inflecture points,and they are featured by strong limbs and weak coupling beams.When the limbs are stronger,i.e.the coefficient is smaller,the lateral stiffness and the ultimate bearing capacity of short-limb shear walls will increase while the ductility will decrease.It is clear that the aseismatic behavior of short-limb shear walls is in accordance with the coupled shear walls.Therefore,the Chinese code 'Technical specification for concrete structures of tall building',which requires raising the aseismatic class of short-limb shear walls,is considered unnecessary.The test results also show that the definition of short-limb shear walls is further tested and verified.Meanwhile,the paper also points out the inaccuracy of defining short-limb shear walls by the ratio of height to thickness of limbs given by the above mentioned code.