Experimental Study On Seismic Performance Of High-strength Concrete Block Wall

The bearing capacity and the seismic ductility of the wall increases greatly with using high strength concrete hollow blocks, high strength and high performance of the mortar masonry wall or adding the core columns and horizontal and vertical steel. The side bearing capacity and seismic performance of concrete hollow block masonry with the framework forming by the core column-constructional column constrained system also increases.This article study on the failure process and failure modes, capacity conditions, hysteretic characteristics, skeleton curve, ductility, viscous damping, rigidity and reinforcement strain properties. Through six high-strength concrete block wall seismic performance cyclic loading test considering different aspect ratios, open hole and not open holes, setting the horizontal reinforcing bar and not setting the horizontal reinforcing bar influence parameters.Experimental results show that: to the wall without opening, adding horizontal reinforcing bar little changes on the cracking load, makes ultimate load increase to 19%, to the wall with opening, adding horizontal reinforcing bar makes cracking load increase to about 14%, ultimate load increase to about 18.9%;The aspect ratio increase the cracking load and ultimate load reduce. Adding horizontal reinforcing bar makes the hysteretic curve of the wall fuller than the hysteretic curve of no horizontal reinforcing bar; As the aspect ratio increases, the hysteretic curve is full. To the wall without opening, adding horizontal reinforcing bar makes the wall ductility increased to 14%, to the wall with opening, adding horizontal reinforcing bar makes the wall ductility increased to 9%; Openings improves the ductility of the wall, with the aspect ratio increases, the ductility increases. To the wall without opening, adding horizontal reinforcing bar makes the viscous damping increase to 4% on cracking loads, about 13% on limit state; Openings makes the viscosity damping increased to 22% on cracking load, 10% on limit state; As the aspect ratio increases, the viscous damping coefficient also increases. Adding horizontal reinforcing bar makes the wall stiffness deteriorate more slowly, and also the final stiffness increases; As the aspect ratio increases, the initial stiffness descends, but stiffness degradation rate is less. The greater the aspect ratio is, the faster the steel strain increases, the faster the shear stress changes.