Study on a New Type of Earthquake Resilient Shear Wall

Abstract eng:
RC shear walls have been widely used in tall buildings in earthquake prone areas around the world due to their high lateral stiffness and strength. It has been found from the past earthquake that RC shear walls easily suffer severe damage concentrating at the bottom. In this study a new type of earthquake resilient RC shear wall with the new replaceable energydissipation components installed at the two bottom corner of the wall was proposed. The replaceable component is mainly composed of the buckling-restrained mild steel core and the concrete filled steel tube. During the strong earthquake the damage is expected to concentrate at the replaceable components rather than the other part of the wall so that the shear wall can be easily repaired and the building can restore its function quickly after the earthquake. The quasi-static tests under cyclic loading were carried out on one traditional RC shear wall specimen and two new shear wall specimens with the aspect ratio of 3.2 and the axial compressive load ratio of 0.25 due to the limitation of loading capacity. The test results show that the new shear wall specimen installed with the replaceable components has much higher carrying capacity, ductility, and energy-dissipation capacity, and a little bit higher lateral stiffness than the traditional shear wall specimen. For the two new shear wall specimens, the one with larger cross-sectional area of replaceable components has a little bit higher carrying capacity, lower ductility, and larger energy-dissipation capacity. Compared with the traditional shear wall specimen, the lateral force-top displacement hysteretic behavior of new shear wall specimens is more stable, with less strength and stiffness degradation after the peak load. As expected, although the damage behavior of all the specimens is flexure-dominating, for the new shear wall specimens the damage mainly concentrates at the replaceable components while the left part is well protected, and for the traditional shear wall specimen the damage concentrates at the bottom. Compared with the earthquake resilient shear wall installed with replaceable rubber bearings developed in the literature, the new shear wall proposed in this study has larger lateral strength and stiffness, and the remaining part excluding the replaceable components is better protected when subjected to the strong earthquake. The numerical models for all the specimens were constructed by using the commercial software ABAQUAS. The pushover analyses were conducted. The computational results agree well with the test results. Finally, by using the verified numerical models the seismic behavior of the specimens with higher axial compressive load ratio which matches the real case more in tall buildings was investigated in order to overcome deficiency of the experimental study due to the loading condition limitation. The simulation results show that in the case under higher compressive loading the seismic performance of the new shear wall is improved similarly with the carrying capacity and deformation capacity much higher than that of the traditional shear wall.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket