基于TDAP软件的既有水管桥抗震性能分析
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摘要
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 have been analyzed so much,but the bridges with special uses were less studied.This paper analyzed the seismic performance of a bridge used for the transport of water(water pipe bridge).Water pipe bridge is very different from the traditional bridge in the aspects of physical properties,load condition and earthquake effect.Firstly,the member model of the water pipe bridge was built,and then the linear and nonlinear constitutive relations of each beam element were set by the difference of material and location.Secondly,the hydrodynamic pressure was converted into additional density and applied to the correspondent elements,due to the effect of water,the vibration of the participation quality of the water pipe bridge's axial and straight direction is different,so conduct modal analysis of the axial and straight direction of this bridge should be conducted respectively.After this analysis,mode,frequency and the Rayleigh damping by modal analysis of the model were determined,then the model was analyzed by time history analysis method with the focus of displacement of bridge deck and the internal force of bridge pier.At last,according to the results of time history analysis,the safety performance of piers of the existing water pipe bridge was checked.In this paper,the research results provide a theoretical reference for the future design and construction of such kind of bridges.
引文
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