预制综合管廊-接头-场地土地震响应分析

Seismic response analysis of prefabricated comprehensive pipe gallery-joint-site soil

为维护城市道路通畅、管道布局合理,新型地下结构预制综合管廊应用逐渐广泛。地震灾害可能会对综合管廊结构造成不可忽视的破坏,使城市经济发展和资源安全受到严重威胁。以福州市马尾区地下预制综合管廊项目为原型,采用双折线模型简化模拟综合管廊接头遇水膨胀橡胶的压缩曲线,不考虑结构与土体间的摩擦滑移,建立三维预制综合管廊-接头-场地土的地震动响应分析模型。首先考虑刚性连接和柔性连接的两种接头形式,研究不同接头连接刚度对综合管廊地震响应的影响;其次通过改变视波速大小实现行波效应,研究不同视波速下,不同预制标准节段长度拼接的综合管廊结构在不同接头位置的地震响应。结果表明,行波效应和预制标准节段长度变化均对预制综合管廊结构的地震响应存在显著影响,随着预制标准节段长度的增大,接头处的地震响应随之增大。

In order to maintain the smooth flow of urban roads and reasonable pipeline layout, the new underground structure prefabricated comprehensive pipe gallery is gradually widely used. Earthquake disasters may cause non-negligible damage to the comprehensive pipe gallery structure, which severely threatens urban economic development and resource security. Taking the underground comprehensive pipe gallery project in Mawei district, Fuzhou city as the prototype, the compression curve of water-expanded rubber in prefabricated comprehensive pipe gallery joints was simply simulated with double broken line model, and the ground vibration response analysis model of three-dimensional prefabricated comprehensive pipe galler-joint-site soil was established without considering the friction and slippage between structure and soil. First, considering the two joint forms of rigid connection and flexible connection, the effect of different joint connection stiffness on the seismic response of the comprehensive pipe gallery was studied. Secondly, the traveling wave effect was realized by changing the apparent wave speed, and the seismic response of the joints at different positions of the comprehensive pipe gallery with different prefabricated standard segment lengths was studied under different traveling wave speeds. The results show that both the traveling wave effect and the change in the length of the prefabricated standard segment have a significant impact on the seismic response of the prefabricated comprehensive pipe gallery structure. As the length of the prefabricated standard segment increases, the seismic response at the joint will increase accordingly.