Application And Development Of Isolation Technique On High-Rise Framed-Supported Shear Wall Structure

The application value of frame-supported shear wall structure is high,but earthquake-resistance performance of the structural bottom is poor. In China , if seismic isolating technology with laminated rubber bearing is applied on frame-supported shear wall structure in high earthquake risk region,not only the earthquake-resistance performance of structure is strengthened and the loss of earthquake is reduced, but also the material and cost of construction is saved.In this paper, a typical high-rise frame-supported shear wall structure in Haikou ( seismic fortification intensityâ…§,0.30g ) is chosen as analysis example, based on this background. By using software ETABS, time history analysis of nonlinear three-dimensional finite element is carried on. Through this, the damping effect of the example structure which is designed by using base isolation and interlayer isolation with laminated rubber bearing is analyzed. Damping effect of seismic isolation structure under strong earthquake is studied,when isolation layer position is changed, while damping effect law of different isolation plan with level stiffness of isolation layer changing is analyzed.Decreasing effect of different isolation plan under pulse ground motion and common near-field ground motion is researched through inputting ground motions from chi-chi earthquake in Taiwan (1999) and ning'er earthquake in Yunnan (2007).The results show:1. If choosing reasonable level stiffness, earthquake reaction of the high-rise frame-supported shear wall isolation structure is reduced, whatever isolation layer position is changed.2.Damping effect of interlayer isolated structure changes with different positions and different level stiffness of isolation layer,when different isolation plan is carried on. The lower the position and level stiffness of isolation layer is, the better the damping effect is.3. Absolute acceleration of structure above the second isolation layer of double-layer isolation is smaller than that of single-layer isolation (decreasing to 10%~43%).4. The structural response of high-rise frame-supported shear wall under intercepting main pulse ground motion is bigger than under integral amplitude ground motion and man-made ground motion.This sufficiently states the leading role of main pulse in integral amplitude ground motion, but this phenomenon can not be explained only by response spectra of earthquake ground motions.