(浙江大学结构工程研究所， 杭州 310058)

［摘要］混凝土结构在建造以及服役过程中不可避免地产生损伤积累、抗力衰减和性能退化。混凝土结构的长期性能是指结构在长期的荷载与环境耦合作用下，随时间推进表现出的具有时变性的功能或特性。结构长期性能反映了结构性能随时间的变化，是结构的综合性能。考虑了在环境侵蚀作用、反复作用、持续作用下混凝土结构的时变累积效应，总结了混凝土结构长期性能在服役全过程中的劣化规律，明确了在环境侵蚀作用、反复作用、持续作用下结构长期性能劣化的各极限状态准则，并基于结构设计现状总结了结构长期性能的分项系数设计法和全概率设计法的设计思路。

［关键词］混凝土结构； 长期性能； 时变规律； 极限状态； 环境侵蚀；  设计理论

中图分类号：TU375文献标识码：A文章编号：1002-848X(2020)13-0001-06

Discussion on fundamental problems on long-term performance of concrete structures

JIN Weiliang, ZHANG Dawei, WU Kexian, HUANG Tengteng, ZHANG Kai

(Institute of Structure Engineering, Zhejiang University, Hangzhou 310058， China)

Abstract:Damage accumulation, resistance degradation and performance deterioration occur inevitably during construction and service life of concrete structures. Long-term performance of concrete structures refers to time-variant performance of structures with long-term load coupled with the environmental erosion. Long-term performance of concrete structure reflects the structural performance over time, which is the overall performance of the structure. The  time-varying cumulative effects including environmental erosion action, repeated action and persistent action were  considered, and the degradation  rule of long-term performance of concrete structures during service was summarized. Based on the current status of structural design, the partial factor method and full probabilistic method of long-term structural performance were summarized.

Keywords:concrete structure; long-term performance; time-varying rule; limit state; environmental erosion; design theory

*国家重点研发计划重点专项项目(2016YFC0701400)，国家自然科学基金重点项目(51638013，51820105012)。

作者简介：通讯作者：吴柯娴，博士研究生，Email：wukexian2019@gmail.com。