Simulation Analysis on Seismic Performance of Assembled Composite Energy Dissipation Pipe Joint

Based on the seismic ductility design concept, a kind of assembled composite energy dissipation pipe joint with rapid repair after the earthquake was proposed. We established the finite element models of assembled composite energy dissipation pipe joints with the 24 different structural parameters, and carried out the low reversed cyclic loading simulation test. The strain cloud diagram, hysteretic curve, skeleton curve, stiffness degradation curve and energy dissipation capacity curve of the pipe joints were obtained. The structural parameters' influence on the performance indexes of the pipe joints was analyzed. The results show that the proposed assembled composite energy dissipation pipe joint has good ductility and energy dissipation capacity. The replacement of peripheral energy dissipation steel plate is simple and fast, and the mechanical properties can be restored after replacement. The diameter thickness ratio of peripheral energy dissipating steel pipe has more significant impact on the seismic performance of the connecting parts. With the increase of the diameter thickness ratio of the peripheral energy dissipating steel pipe, the energy dissipation capacity gradually increases. The ratio of height to thickness has less effect on the seismic performance of the model, and the initial stiffness and energy dissipation capacity of the model are significantly enhanced after the stiffened steel pipe is installed outside.