Collapse Resistance Model and Deformation Mechanism of Shear Wall Replacement

Abstract Structural elements can be damaged or defective due to man-made and natural disasters, which will result in structural resistance below the design value. Component replacement can effectively improve the safety of the structure and does not affect its later use. However, this construction process must dismantle defective components. If the process is not properly operated, it will cause progressive collapse of the structure. There are few studies on progressive collapse resistance based on field tests. In this paper, the alternate load path method is used to study the deformation mechanism of reinforced concrete shear wall structures when partial members fail. The maximum vertical displacement and strain of the beam end near the failure walls are obtained, and load transfer laws are analyzed. Based on the component replacement construction of a high-rise shear wall structure, the progressive collapse resistance mechanism of the shear wall structure is verified, which provides theoretical guidance for component replacement construction.

【摘要】结构构件可能因人为灾害与自然灾害发生损伤或缺陷，导致结构抗力低于设计值。构件更换可有效提升结构安全性且不影响后续使用，但该施工过程需拆除缺陷构件，若操作不当则会引发结构渐进式倒塌。当前基于现场试验的结构抗渐进倒塌研究较为匮乏。本文采用交替荷载路径法（alternate load path method），研究部分构件失效时钢筋混凝土剪力墙结构（reinforced concrete shear wall structure）的变形机制，获取了失效墙体附近梁端的最大竖向位移与应变，并分析了荷载传递规律。结合某高层剪力墙结构的构件更换施工案例，验证了该类剪力墙结构的抗渐进倒塌机制，可为构件更换施工提供理论指导。