同济大学学报（自然科学版）2025，Vol.53Issue(4)：521-530,627,11.DOI:10.11908/j.issn.0253-374x.23320
面向韧性的大跨度桥钢筋混凝土桥塔抗震性能设计与控制指标
Specific Performance Indices and Appropriate Performance Limits for Seismic Resilience Design of Reinforced Concrete Pylons of Long-span Bridges
摘要
Abstract
The performance objective of reinforced concrete pylons of long-span bridges under the safety evaluation earthquake(SEE)is consistent at home and abroad;however,the specified performance limits used for the seismic design of pylons are quite different.The performance requirements at the ultimate limit state and the operational limit state of post-earthquake structures are analyzed,and then the specific performance indices for the seismic resilience design of post-earthquake structures are presented,including residual capacity,residual displacement,residual stiffness,and residual crack width.Based on the fourth Panama Canal Bridge,the four widely used performance limits,such as the first yield moment,effective yield moment,limited ductility of q=1.5,and limits of material strains,i.e.,steel tensile strain less than 0.01 and concrete compressive strain less than 0.004,are compared.It is shown that the difference between seismic intensities corresponding to the four performance limits is very large,even larger than that between SEE and the functional evaluation earthquake(FEE).The four performance limits are further evaluated with the specific performance indices presented for the seismic resilience design of post-earthquake structures.The first yield moment,effective yield moment,and limited ductility of q=1.5 can well satisfy the performance objective of sustaining to full functionality after the shock with none or only simple rehabilitation.The currently used performance limit of effective yield moments for the seismic design of pylons under SEE seems too conservative and at least the limited ductility of q=1.5 could be used instead.Moreover,considering the stiffness degradation due to the seismic damage and its effect on the increase of displacement responses of expansion joints,bearings,and damping units,the performance limit of material strains,i.e.,steel tensile strain less than 0.01 and concrete compressive strain less than 0.004,could be employed.关键词
大跨度桥梁/钢筋混凝土桥塔/韧性性能设计指标/残余承载力/残余位移/残余刚度/性能控制指标Key words
long-span bridges/reinforced concrete pylons/performance indices for seismic resilience design/residual capacity/residual displacement/residual stiffness/performance limits分类
交通运输引用本文复制引用
管仲国,徐瑜窈,李建中,吴勇木,肖益锋..面向韧性的大跨度桥钢筋混凝土桥塔抗震性能设计与控制指标[J].同济大学学报（自然科学版）,2025,53(4):521-530,627,11.基金项目
国家自然科学基金(52278527) （52278527）
上海市科技攻关项目(22dz1201200) （22dz1201200）
