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对独柱双层高架桥墩柱模型进行了模拟地震振动台试验,测试了结构水平向加速度、位移等反应数据,据此计算了墩底和墩身突变截面的地震弯矩,分析了结构损伤发展趋势。结果表明:独柱双层高架桥在水平方向的地震反应主要取决于对应方向前2阶振型贡献;墩柱开裂后,随调幅地震波的次第输入,结构损伤指标随关键自由度最大地震位移增长呈分段线性、梯级上升趋势,并在接近屈服前收敛为常数,此时墩柱截面有效刚度宜根据截面弯矩曲率关系分析确定。
Simulated seismic shaking table test was carried out on the single column viaduct pier model, the response data of the horizontal acceleration and displacement of the structure were tested, and the seismic moment of the abrupt section of the pier bottom and pier body was calculated, and the structural damage development trend. The results show that the horizontal seismic response of a single-column viaduct depends mainly on the contribution of the first two modes in the corresponding direction. After cracking of the pier, with the second input of the amplitude-modulated seismic wave, the structural damage index increases with the maximum seismic displacement of the key degrees of freedom Piecewise linear and step-up trend, and converges to a constant before yielding. At this moment, the effective stiffness of pier section should be determined according to the curvature of section moment.