设置可更换耗能连梁的双柱式自复位桥墩抗震性能及设计方法研究

Improving bridge seismic resilience has great significance for normal city operation and sustainable society development. Couple-self-centering-column pier with replaceable coupling beams is characterized by its resilience. The seismic performance, modeling method and mechanics theories are systematically studied in this proposal by the combined approach of model test, numerical analysis and theoretical derivation. Firstly, the mechanical behavior of replaceable coupling beam under the repeated loading is obtained by the quasi-static test, the optimal designs of replaceable coupling beam is conducted, and the correction factor related to restriction is proposed according to parameter analysis. Multi-scale finite element model considering the influence of collision between column and bent cap/footing is developed to study the mechanical behavior of self-centering column, cushion between column and bent cap/footing is optimized. Finally, seismic performance of proposed pier is studied based on model test and numerical analysis. Corresponding analytical model is established and design method is proposed. The research results will improve and develop the design theory and application technology of couple-self-centering-column pier with replaceable coupling beams.

提高桥梁灾后功能可恢复能力，对城市灾后的正常运营，社会可持续发展具有重大意义。设置可更换耗能连梁的双柱式自复位桥墩是一种震后功能可恢复的新型桥墩，其抗震机理尚未明确。本项目拟采用模型试验、数值模拟和理论分析相结合的方法展开研究，旨在揭示该桥墩的抗震机理、完善其数值模拟方法、建立相应理论分析模型、提出该桥墩设计方法。首先，通过可更换耗能连梁拟静力试验揭示往复荷载作用下连梁的受力机理；基于参数分析优化连梁设计、得到梁端约束修正系数。考虑桥墩摇摆过程中撞击的影响，提出自复位墩柱多尺度有限元模型的建立方法，研究自复位墩柱的力学性能，并基于参数分析优选垫层方案。最后，通过桥墩整体拟静力试验和多尺度有限元模型数值仿真，研究该新型桥墩的抗震性能，建立理论分析模型并提出相应的设计方法，并通过典型实例进行验证。本项目研究成果将完善和发展设置可更换耗能连梁的双柱式自复位桥墩的设计理论和应用技术。

提高桥梁灾后功能可恢复能力，对城市灾后的正常运营，社会可持续发展具有重大意义。设置可更换耗能连梁的双柱式自复位桥墩是一种震后功能可恢复的新型桥墩，其抗震机理尚未明确。本项目采用模型试验、数值模拟和理论分析相结合的方法展开研究，揭示了该桥墩的抗震机理、完善了其数值模拟方法、建立了相应理论分析模型、提出了该桥墩设计方法。本项目研究成果将完善和发展设置可更换耗能连梁的双柱式自复位桥墩的设计理论和应用技术。