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为了探讨管节接头在地震作用下的减震措施和手段,首创性地提出了基于金属屈服耗能阻尼器的沉管隧道管节减震耗能方法,设计了一套可用于沉管隧道管节接头的减震耗能装置,并通过关键参数优化的方法,以接头弯矩-转角曲线所围成的面积作为优化目标函数,对该减震耗能装置的线刚度进行优选;最后,通过对接头施加水平弯矩荷载,完成了无减震耗能装置接头和安装减震耗能装置接头2组大比尺对比结构试验,分别得到2组试验工况下管节接头的弯矩-转角曲线,计算得到管节接头力学性能参数(如抗弯刚度和滞回圈面积等),并对各参数进行了对比分析,检验了该减震耗能装置用于提高沉管隧道抗震性能的技术可行性。试验结果表明:无减震装置和安装减震装置后,接头的弯矩-转角曲线均出现明显的滞回圈,两者滞回圈形状大致相同;与无减震耗能装置的接头试验相比,安装该减震耗能装置后,在接头承受相同的转角条件下,接头所承受的最大弯矩从730kN·m提高到了1 000kN·m,提高了约37%;接头弯曲刚度由6.19×105kN·m·rad-1提高到8.97×105 kN·m·rad-1,增大了约45%;而反映接头耗能性能的接头弯矩-转角曲线所围成的滞回圈的面积提高了约69%,接头的滞回性能得到了显著的提高。
In order to discuss the measures and means of shock absorption of pipe joint under seismic action, a method of shock absorption and energy dissipation for immersed tunnel pipe section based on metal yielding energy-dissipating damper was first proposed. Section joints, and by optimizing the key parameters, the area enclosed by the joint bending moment-rotation curve is taken as the optimization objective function, and the line stiffness of the damping energy dissipation device is optimized. Finally, The horizontal bending moment load was applied to the joint to complete the comparative test of two groups of joints with no damping energy dissipation device joint and damping energy dissipation device joint to obtain the bending moment and rotation angle of the pipe joint under two test conditions respectively Curve, the mechanical performance parameters (such as bending stiffness and hysteresis loop area) of the pipe joint are calculated and compared with each other to test the technology of the shock absorber energy dissipation device to improve the seismic performance of immersed tunnel feasibility. The experimental results show that the hysteresis loops of the joints show obvious hysteresis loops after the shock-absorbing device is installed and the damping device is installed. The hysteresis loops of the two housings are almost the same. Than the installation of the damping energy dissipation device, the joint under the same corner conditions, the joint to withstand the maximum bending moment increased from 730kN · m to 1000kN · m, an increase of about 37%; joint bending stiffness from 6.19 × 105kN · m · rad-1 increases to about 8.97 × 105kN · m · rad-1, and the area of the hysteresis loop which is formed by the joint bending moment-rotation curve which reflects the energy dissipation performance of the joint increases About 69%, the joint hysteresis performance has been significantly improved.