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Study on seismic performance and influence factors of lateral stiffness of reinforced rib composite wall with a window

CHEN Guoxin;CHEN Yeshun;LV Xinmin;School of Water Conservancy and Civil Engineering, Xinjiang Agricultural University;  
A test was conducted on the seismic performance of a 1∶2 scaled reinforced ribbed composite wall model with a window hole. The strain of steel bar in the specimen was analyzed to study the mechanical performance and failure mode of the wall. The seismic performance such as bearing capacity, hysteretic and energy dissipation, displacement ductility, and stiffness degradation of the specimen under cyclic loading was explored, which were also compared with the seismic performance of standard walls without hole. On the basis of experimental research, the finite element numerical models with different window hole parameters were established in order to explore the influence of the position, size, rib column section and reinforcement ratio of the rib column on the lateral stiffness of reinforcing rib composite wall. The results show that the reinforced ribbed composite wall with a window hole is destroyed in sequence of block-frame-rib, the failure mode is mainly bending-shear failure. The seismic performance such as lateral stiffness of the wall with a window hole is poor compared with standard walls without hole. The lateral stiffness of reinforced ribbed composite wall with a center window hole is relatively larger than other cases with the same size of window hole. There is no need to set up the ribbed column for the wall with hole rate less than 12.9%. The reinforcing rib columns at the edge of the hole have an obvious improvement to the lateral stiffness of the wall with a window hole,but the improvement effect gradually decreases with the increase of rib section. The increase of reinforcement ratio of the rib column is not obvious on improving the lateral stiffness.
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