预压碟簧自复位钢筋混凝土桥墩恢复力模型与滞回性能研究

Research on hysteretic model and hysteretic behavior of self-centering concrete pier with pre-pressed disc spring devices

为减小钢筋混凝土桥墩在地震中的损伤并且实现经济快速的震后恢复,提出一种新型预压碟簧自复位钢筋混凝土桥墩(PDS-SCCP)。文中对PDS-SCCP的整体构造和工作原理进行了详细介绍,并建立了反映其滞回特性的恢复力模型。采用ABAQUS建立PDS-SCCP的数值模型,并将ABAQUS计算结果与恢复力模型进行对比分析。结果表明:文中建立的恢复力模型能够较准确地描述PDS-SCCP的滞回特征;在往复荷载作用下,PDS-SCCP可以实现预期的工作机制,其塑性损伤集中于可更换耗能装置,混凝土墩身基本保持弹性,复位装置能够稳定地为桥墩提供恢复力。

In order to reduce the damage of reinforced concrete piers in earthquake and realize economic and rapid recovery after earthquake,a new pre-pressed disc-spring self-centering concrete pier(PDS-SCCP)is proposed in this paper.The whole structure and working principle of PDS-SCCP are introduced in detail.The hysteretic model describing the hysteretic behavior of PDS-SCCP are established.A numerical model of PDS-SCCP was established by using ABAQUS.The results of ABAQUS calculation were compared with those of the hysteretic model.The results show that the hysteretic model established in this paper can accurately describe the mechanical properties of PDS-SCCP at each stage.Under reciprocating load,PDS-SCCP can achieve the desired working mechanism.The plastic damage of PDS-SCCP focus on the energy dissipation devices,and the reinforced concrete bridge pier keep elasticity.The self-centering devices of PDS-SCCP are overall elastic and can stably provide self-centering to the bridge pier.