短肢剪力墙结构扭转效应试验研究

对按国家现行《异形柱结构设计规范》设计的一个三层短肢剪力墙空间结构施加偏心的低周水平反复荷载,研究短肢剪力墙结构在扭转作用下的裂缝发展及结构受力情况。试验结果表明,短肢剪力墙空间结构属于典型的"强墙肢弱连梁"结构,连梁端部是结构薄弱区域,梁端首先出现塑性铰,较好地耗散了地震能量;靠近节点附近的外边缘墙肢部位受到扭矩和楼层较大弯矩的双重作用,受拉作用被强化,是墙肢的薄弱部位;在墙肢连梁相交位置处的节点受弯曲-剪切-扭转共同作用,前期主要通过节点内部的斜压杆机构传递剪力。

An Experimental Study on the Torsion Effect of Short-Pier Shear Wall Structures

An eccentric low cyclic horizontal loading has been applied to the spatial structure of a three-storied short-per shear wall, which has been designed according to the current national Design Specification for Special-Shaped Column Structures. A research has been made of the crack development and structural stress of the structures under the torsional loading. Experimental results show that the short-pier shear wall structure is a typical structure with strong limbs and weak beams, its tie-beam end being the weak region of the structure. The plastic hinges at the end of the tie-beam effectively consume the seismic energy, and the part near the outer edge of the wall limbs, also a weak component of short-limb shear wall structure, whose tension has been strengthened under the double effects of the torque and the relatively large bending moment of the storey. The shear force is transferred through the baroclinic rod mechanism inside the joint of beams, which has been under the multiple effects of bending, shear and torsion.