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目前虽然对桥梁的抗震性能分析已经很多,但是对于具有特殊用途桥梁的分析则较少。本文针对某已经建成的一座用于运输水源的桥梁(水管桥)进行抗震性能分析。水管桥的物理性质、荷载情况以及地震影响等方面都与传统桥梁有很大不同。首先建立水管桥的梁单元模型,根据材料以及位置的不同,分别对梁单元设置线性和非线性的本构关系;其次将动水压力转换成附加密度加在相应的单元上,由于水的影响,水管桥顺桥向与横桥向振动时的质量不同,因此对此桥的顺桥与横桥向分别进行模态分析;然后根据模态分析结果确定主振型、频率、瑞利阻尼,并对模型顺桥和横桥向进行时程分析,重点分析桥面的位移以及桥墩的内力。最后根据时程分析结果,对原有水管桥的桥墩进行安全性能检查。本文研究成果为今后此类桥梁的设计及施工提供理论参考。
At present, although the seismic performance of bridges has been analyzed a lot, the analysis of bridges with special purpose is less. In this paper, a seismic performance analysis of a bridge (water pipe bridge) used to transport water has been done. The physical properties of the water pipe bridge, load conditions and the impact of earthquakes are all very different from traditional bridges. Firstly, the beam element model of the water pipe bridge is established. According to the different materials and locations, linear and nonlinear constitutive relations are set respectively for the beam elements. Secondly, the hydrodynamic pressure is converted to the additional density and added to the corresponding element. Due to the influence of water , The quality of the bridge along the bridge and the transverse bridge vibration is different, so modal analysis of the bridge along the bridge and transverse bridge were carried out respectively; Then, the main vibration mode, frequency, Rayleigh damping, Time-course analysis of the model along the bridge and the transverse bridge is carried out, with emphasis on the displacement of the bridge deck and the internal forces of the pier. Finally, based on the results of time history analysis, the safety performance of the existing pier of the water pipe bridge is checked. The results of this paper provide theoretical reference for the design and construction of such bridges in the future.