近海大气环境下RC框架结构的性能化全寿命抗震能力研究

In this project, the seismic capability of offshore RC frame structure will be investigated based on the theory and method integration of performance-based earthquake engineering and Life cycle-based earthquake engineering.The damage and failure mechanism of offshore RC frame beam, column,joint and structure with various service ages and design parameters will be revealed, and the relationship between the performance index system of them,including the basic bearing capacity, deformation, ductility as well as energy dissipation capacity etc.,and the service age as well as design parameters will be established according to the test results. Following, a new concentrated plastic hinge model for offshore RC frame beam and column component as well as a new shear restoring force model for offshore RC frame beam-columnjoint will be proposed respectively, which can reflect the influence of service age and design parameters, and then, the numerical simulation method for Life cycle seismic behavior analysis and the collapsed recognition method of offshore RC frame structure will be given to reveal the seismic response rule and collapse mode of offshore RC frame structure with different service ages and design parameters. Based on the results of large numbers of seismic response analysis, the performance-based time-dependent seismic fragility model will be put forward to evaluate the failure probability when the offshore RC frame structure subjected to different intensity ground motion. At last, a performance-based and life cycle-based seismic optimization design method for offshore RC frame structure will be proposed. This research helps to promote the seismic capability of offshore RC structures and offers an exciting new direction for civil engineering within the context of sustainable urban development.

着眼于近海大气环境作用下的RC框架结构，将基于性能地震工程和基于全寿命周期地震工程的理论方法有机交叉与融合，深入研究框架结构性能化全寿命抗震能力。通过试验研究，揭示不同服役龄期和设计参数近海大气RC框架梁柱、节点与结构的地震破坏过程与机制，建立其不同性能水准指标体系随服役龄期及设计参数变化规律，进而建立考虑服役龄期与设计参数影响的框架梁柱塑性铰模型和节点剪切恢复力模型；提出近海大气RC框架全寿命抗震性能的数值模拟方法与倒塌识别方法，全面揭示不同服役龄期与设计参数框架结构的地震反应规律与倒塌模式；建立近海大气RC框架性能化时变地震易损性模型，揭示不同服役龄期与设计参数结构在遭遇不同水准地震作用时各性能水准的失效概率；提出近海大气RC框架结构性能化全寿命抗震优化设计方法。研究对提升我国近海环境土木工程基础设施防震减灾能力，完善我国性能化全寿命抗震设计理论，促进土木工程可持续发展具有重要指导意义

着眼于近海大气环境作用下的 RC 框架结构，将基于性能地震工程和基于全寿命周期地震工程的理论方法有机交叉与融合，深入研究了框架结构性能化全寿命抗震能力。通过试验研究，揭示了不同服役龄期和设计参数近海大气 RC 框架梁柱、节点与结构的地震破坏过程与机制，建立了其不同性能水准指标体系随服役龄期及设计参数变化规律，进而建立了考虑服役龄期与设计参数影响的框架梁柱塑性铰模型和节点剪切恢复力模型；提出了近海大气 RC框架全寿命抗震性能的数值模拟方法与倒塌识别方法， 全面揭示了不同服役龄期与设计参数框架结构的地震反应规律与倒塌模式；建立了近海大气 RC 框架性能化时变地震易损性模型，揭示了不同服役龄期与设计参数结构在遭遇不同水准地震作用时各性能水准的失效概率； 提出了近海大气 RC 框架结构性能化全寿命抗震优化设计方法。研究成果对提升我国近海环境土木工程基础设施防震减灾能力，完善我国性能化全寿命抗震设计理论，促进土木工程可持续发展具有重要指导意义。