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为研究S形非规则高架曲线桥梁在地震作用下的抗震性能,制作一座相似比为1/20的模型桥梁,对该模型桥梁测试过程的试验现象、动力特性、加速度及位移测试数据进行详细分析研究。结果表明:S形曲线桥梁在整个测试过程中结构自振频率下降明显,阻尼比显著增大;多遇地震输入时墩底加速度峰值小于墩顶加速度峰值,罕遇地震输入时,由于墩梁扭转十分严重,导致墩顶加速度峰值小于墩底加速度峰值;多遇地震时,墩梁径向相对位移大于切向相对位移,罕遇地震作用下,墩梁径向相对位移小于切向相对位移。
In order to study the seismic behavior of S-shaped irregular elevated viaduct bridges under earthquake action, a model bridge with similar ratio of 1/20 is made, and the test phenomena, dynamic characteristics, acceleration and displacement test data of the model bridge are analyzed in detail the study. The results show that the natural frequency of the S-shaped curved bridge decreases obviously and the damping ratio increases significantly during the whole testing process. The peak of bottom acceleration at the time of earthquake input is less than the peak of pier top acceleration. When the rare earthquakes are input, And the peak acceleration of pier is less than the peak of acceleration at the bottom of pier. In the case of an earthquake, the radial relative displacement of the pier is greater than the relative displacement in the tangential direction, and the radial relative displacement of the pier is less than the relative displacement in the tangential direction under the rare earthquake.