倒虹吸混凝土管道的地震反应分析

基于土体的等效粘弹性模型,结合场地典型剖面的土体特性以及室内实验确定的各力学参数,采用时域积分和迭代的方法研究了沁河倒虹吸管道在地震作用下的反应,分析了管道截面中间底部点绝对地震位移、顶部点相对于底部点的地震动位移及管道动静综合主应力的变化规律;并根据有限元时程法的分析结果,按照混凝土承载能力极限状态设计式,对管身混凝土的抗拉、抗压安全度进行校核。结果表明,在人工地震波、调整后的E1 Centro和Pulgas地震波分别输入的情况下沁河渠道倒虹吸管道均满足抗震要求。

Analysis on Earthquake Response of the Inverted Siphon Concrete Pipes

Adapting the equivalent viscoelastic model considering the characteristics of the soils at the site and some mechanics parameters such as maximum shear modulus,dynamic elastic modulus and damping ratio,determined by tests,the earthquake responses of Qinhe inverted siphon pipes are studied based on the method of integral in time domain and interation,and distribution regularity of the absolute displacement at the bottom center of the pipes,relative displacement of the top center to the bottom center of the pipes,and dynamic and static synthesis principal stresses are analyzed.According to the analysis results of finite elements method and the design equation of concrete limit bearing capacity,the security degree of resistance capacity of tensile and compress for the concrete pipes are checked.The results indicate that Qinhe inverted siphon pipes satisfy with earthquake-resistance requirements effected when man-made,the adjusted E1 Centro and Pulgas seismic waves inputted individually.