Study on the seismic mechanism of RC frame-composite wall structure with insulation core based on novel sliding connections
Haopeng Dong,Kang Yuan,Han Zhou,Huadong Zhang,Tao Feng,Jiepeng Liu
Abstract
This study proposes a novel sliding connection designed for achieving a suitable connection between sandwich composite wall panels (SCWP) and the reinforced concrete (RC) frame. Low-cycle reversed horizontal loading tests were conducted on three specimens: RC frame with SCWP using the sliding connection, RC frame with SCWP using rigid connection, and bare RC frame, to investigate the seismic failure mechanism and seismic performance of RC frame-SCWP systems with the sliding connection. The failure modes, hysteresis curves, backbone curves, stiffness degradation curves, and cumulative energy dissipation curves of the three specimens were comparatively analyzed. Results indicate that SCWP can enhance the shear capacity and initial stiffness of the RC frame. With the sliding connection, the wall can move within the RC frame along the predesigned sliding slots, dissipating seismic energy through its own movement and thus improving the structural energy dissipation capacity. Additionally, flexible strips were installed between the wall and frame, effectively reducing the wall's constraint on the frame and further enhancing structural deformability. Consequently, the specimen with the sliding connection exhibited 95.9% higher ductility and 32.1% greater cumulative energy dissipation than the rigidly connected specimen, with improved energy dissipation and reduced wall damage. Based on the equivalent diagonal strut singlebar model, a formula for calculating the lateral stiffness of RC frame-SCWP structures with the sliding connection was established.
Haopeng Dong, Han Zhou, Huadong Zhang, Tao Feng — College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi, 832003, China
Kang Yuan — 1) College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi, 832003, China; 2) Xinjiang Production & Construction Corps Key Laboratory of Civil Engineering Structural Safety in Cold, Arid and Strong Earthquake Regions, Shihezi, 832003, China
Jiepeng Liu — College of Civil Engineering, Chongqing University, Chongqing, 400045, China
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