Study On Fire-resistance And Post-fire Seismic Behavior Of Steel Plate-concrete Composite Shear Wall

In recent years, with the economic development and population growth in China, more and more high-rise buildings have been built, Shear walls has been widely used in high-rise buildings for their good seismic performance. As a new tipe of shear wall, composite shear walls with double steel plate and infilled concrete have advantages such as thin-wall, light weight, good ductility, simple details, convenient construction and so on. Quite a few scholars have studied on the behaviors of the composite walls at normal temperature, but there are few studies on the behaviors under high temperature and after exposed to high temperature. Fire resistance and post-fire seismic behavior of this new type of shear walls are studied, the main research work is as follows:(1) Eight specimens were tested for fire-resistance with full exposure to fire. The main parameters varied in the test were intervals of reinforcement, intervals of studs, axial compression ratio, aspect ratio, steel plate thickness, and shear wall thickness. The result of test shows that:(a) The fire-resistance of all specimens exceed 120 mins. It is found three failure modes in the test, that is local buckling of steel plate, weld tear and wall instability;(b) Steel plate thickness and intervals of studs have no significant effect on the temperature distribution and fire resistance;(3) The wall thickness and axial compression ratio have a significant impact on fire resistance. The thicker the wall is, the better the fire resistance is; the smaller the axial compression ratio is, the better the fire resistance is.(2) Four specimens were tested for fire-resistance with just a single side exposed to fire, The influence of steel plate thickness and shear wall thickness on the fire-resistance specimens were investigated. The result indicates that:(a) The fire-resistance of four specimens reaches 200mins;(b) The wall thickness has a significant impact on the fire resistance. The thicker the wall is, the better the fire resistance of SCW is.(3) Three specimens were tested under low cyclic loading after exposed to fire about one hour and then cooled down for months. The influences of aspect ratio on seismic performance were investigated. The result of test indicates that all specimens have good loading-bearing capacity, ductility, energy dissipation, and exhibit good seismic performance.(4) The fire-resistance and post fire seismic behavior of specimens were simulated by using finite element software ABAQUS. The influences of different parameters on behavior of SCW specimens were studied. The analysis results show that: In addition of reasonable selection of material parameters, ABAQUS could be used to simulate the behaviors of SCW specimens with good performance. The results of theoretical analysis are in good agreement with those of in the test.