大断面装配式综合管廊抗震性能试验研究

Study on the Test of Seismic Performance of Prefabricated Utility Tunnel with a Large Section

  • 摘要: 以雄安新区启动区城市综合管廊工程为依托,为明确综合管廊结构的抗震性能,完成了四舱大断面综合管廊的整体结构模型和节点试件的低周反复加载抗震试验,并对试件的破坏状态及力学特性进行计算分析。结果表明:(1)整体结构的滞回曲线比较饱满,表现出良好的延性和耗能能力,中节点具有较好的受弯性能,边节点延性差于中节点延性;(2)节点试件骨架曲线分为明显的开裂、屈服和极限三个阶段,整体结构达到极限荷载后曲线基本趋于水平;(3)在整个加载过程中整体结构和节点试件的刚度退化持续均匀;(4)综合管廊的结构设计能够保证正常使用下的抗震性能。结合试件受力特性及破坏状态,对本工程管廊结构进行设计优化。

     

    Abstract: Based on the urban utility tunnel project of the Start-up Area of Xiong′ an New Area, in order to define the seismic performance of the utility tunnel structure, the low-frequency cyclic loading anti-seismic test was completed on the overall structure model and joint test pieces of the large-section utility tunnel with four compartments,and the computational analysis was carried out of the state of failure and mechanical property of test pieces. The results show that (1) the hysteresis curve of the overall structure is relatively saturated, showing good ductility and energy dissipation capacity, the middle joints have better bending performance, and the ductility of the joints on the edges is worse than that of the middle joints; (2) the skeleton curve of joint test pieces is split into three phases: obvious cracking, yield and ultimate phases, and after the overall structure reaches the ultimate load, the curve is basically close to being horizontal; (3) the stiffness degradation of the overall structure and joint test pieces is continuously uniform throughout the loading process; (4) the structural design of the utility tunnel can ensure seismic performance during normal use. Combined with the stress characteristics and state of failure of test pieces, the structural design of the utility tunnel of the Project is optimized.

     

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