Seismic Analysis Of Tall Bunding With Short-leg Shear Wall

Short-leg shear wall structure is a newly developed structure with advanced features of frame structure and normal shear wall structure. It fulfills architectural function, load mechanism and engineering budget requirements, and is highly preferred by owners, developers and engineers. This engineering system first appeared in engineering practice with a lack of theoretical studies, especially in seismic reaction analysis. This paper focuses on seismic reaction analysis of short-leg shear wall, and several conclusions are achieved:1. Natural vibration period of each mode shape of the structure decreases as the thickness of shear wall increases. With a fixed height and earth quake action, stress magnitude decreases when increase the thickness, proportion and resisting moment of shear wall cross-section. When the thickness of cross-section increases, height to thickness will then declines and inertia moment and lateral stiffness increase with the growing of cross-section surface area, thus displacement is reduced.2. Natural vibration period of each mode shape of the structure increases as the length to height ratio of coupling beam raises. When the length to height ration of coupling beam is relatively small, the stiffness will be relatively high, which increases the restraining capacity of coupling beam to the shear wall. The strengthened whole structure behavior results in a strong bearing capacity. However, the high length to height ratio of coupling beam leads to the forming of a structure with strong beam and weak wall, which increase coupling beam’s proportion of moment enduring, while shear wall’s enduring proportion decreases. Thus the moment endured by shear wall will increase in a rapid way when coupling beam yields. Failure of the structure will arrive sooner than the coupling beam with a large ration of length to height, and malleability of the structure decreases.3. Natural vibration period of each mode shape of the structure increases as the structure’s number of floors grows. The vertex replacement will increase when structure’s number of floors becomes larger, because axial press will increase when the structure is higher, which means the growing of axial compression ratio and compressive stress. Thus the additional moment created by compressive will grow larger, which leads to the greater replacement.