Comparative Analysis on Cooperative Performance of RC Frame-shear Wall Structures under Various Types of Ground Motions
Ensuring the cooperative performance of dual lateral force-resisting systems under strong earthquakes is key to developing multiple seismic fortification lines. Based on ground motion character-istics analysis,the study compared and analyzed the cooperative performance of RC frame-shear wall structures under various types of ground motions,including ordinary,far-field long-period,near-fault forward,and near-fault fling-step ground motions. It also evaluated the effects of stiffness eigenvalues and structural periods on performance. Additionally,a frame shear force adjustment method consider-ing the internal force redistribution under various types of special ground motions was preliminarily proposed and compared with the adjustment method in the current codes. The results showed that the frame shear force sharing ratio under the three types of special ground motions was higher than that un-der ordinary ground motions. Especially,far-field long-period ground motions could cause a large in-crease in frame shear force even at lower seismic intensities. The frame shear force in the middle and lower floors of structures with longer periods increased faster. With the increase in stiffness eigenval-ue,the frame shear sharing ratio also increased,but the degree of internal force redistribution gradual-ly decreased. It is suggested that the effects of different ground motion types and stiffness eigenvalues on internal force redistribution within structure should be considered in seismic design.