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为了研究钢管混凝土拱桥地震响应特性,以某钢管混凝土拱桥为原型,通过采用人工质量一致相似律设计制作1∶10缩尺比例的钢管混凝土拱结构模型,利用福州大学地震模拟振动台台阵系统,采用正弦波激励、Taft波以及当地场址生成的人工波等,进行了纵向、横向、横向+纵向地震动试验。试验结果表明,不同的地震波激励使结构产生不同的地震响应。Taft波横向激励产生的响应小于纵向激励的,人工波正好相反。拱顶的加速度相对于拱脚的有放大作用,放大倍数与输入波形的卓越周期相关;多维激励和行波激励使结构的加速度、位移和应变响应显著增大,其对结构的影响比一致激励时更为不利。不过,试验过程中模型均未出现开裂和破坏现象,表明钢管混凝土拱结构具有良好的抗震性能。
In order to study the seismic response of CFST arch bridge, a concrete-filled CFST arch bridge is used as a prototype. A 1: 10 scale concrete-filled steel tube arch model is designed and manufactured by adopting the consistent similarity law of artificial mass. Using the seismic analog vibration table array system of Fuzhou University, Sine wave excitation, Taft wave and artificial wave generated at the local site were used to conduct longitudinal, transverse and transverse + longitudinal seismic tests. The experimental results show that different seismic waves stimulate the structure to produce different seismic responses. Taft wave transverse excitation response is less than the longitudinal excitation, the artificial wave is the opposite. The acceleration of the vault is magnified relative to the arch, and the magnification is related to the excellent period of the input waveform. The multi-dimensional excitation and the traveling wave excitation significantly increase the acceleration, displacement and strain response of the structure, When more negative. However, no cracking and failure occurred in the model during the test, indicating that the CFST arch structure has good seismic performance.