华中科技大学学报（自然科学版）2024，Vol.52Issue(12)：135-141,7.DOI:10.13245/j.hust.241216
考虑蠕变的索杆结构安全年限研究
Study on safety life of cable-strut structures considering cable creep
摘要
Abstract
Aiming at the problem that the cables of the cable-strut structure would creep and relax during long-term service,resulting in a decrease in structural stiffness and redistribution of internal forces,and to ensure the safety performance of the structure,the limit state equations and inequalities were respectively established based on the reliability theory and two structural limit states.The formula for the members'internal force variation as well as nodal displacement variation of cable-strut structure due to variation of the member length was derived,and the method to determine the creep elongation limit and structural safety life of cable-strut structure was proposed combined with the mathematical programming and the cable creep model.The numerical example of a Levy cable dome was carried out,and multiple reliability indexes were compared with the limit values in specification and finite element numerical solutions.Results show that the reliability indexes values in specification are relatively small,and the calculated creep elongation limit of steel cables as well as the structural safety life are greater than numerical simulation results based on cable creep model.If the structure is designed and maintained according to these values,there will be a greater probability of failure,causing the structure to break the limit state during service.Therefore,the reliability indexes in specification and corresponding structural limit states should be taken into consideration together.关键词
索杆结构/蠕变/数学规划/蠕变伸长限值/安全年限Key words
cable-strut structure/creep/mathematical programming/creep elongation limit/safety life分类
土木建筑引用本文复制引用
邓满宇,袁行飞,冯越,何振翔..考虑蠕变的索杆结构安全年限研究[J].华中科技大学学报（自然科学版）,2024,52(12):135-141,7.基金项目
国家自然科学基金资助项目(51878600,52278224). （51878600,52278224）
