同济大学学报（自然科学版）2024，Vol.52Issue(1)：49-58,85,11.DOI:10.11908/j.issn.0253-374x.22487
支管轴压下高强钢圆管X形节点的承载力计算公式
Bearing Capacity Formula of High-strength Steel CHS X-joints Under Axial Compression
摘要
Abstract
The static performance of circular hollow section(CHS)X-joints using Q460,Q690,Q960 high-strength steel under axial compression was investigated.Using the finite element(FE)model verified by experimental results,extensive FE parametric analyses of joints were carried out.The effects of high-strength steel grades,brace-to-chord diameter ratios(β),chord diameter-to-wall thickness ratios(2γ),and chord axial stress ratios(n)on the structural behavior of joints were studied.Then,the suitability of the bearing capacity formula adopted by Chinese Standard GB 50017―2017 was evaluated against the results obtained from FE parametric analyses and literature test results.The conclusions can be drawn that the failure mode of joints is chord plastification,and the joint bearing capacity is often determined by the chord indentation limit,i.e.,3%of chord diameter;the bearing capacities of high-strength steel CHS X-joints are overestimated by the formula of Chinese Standard GB 50017―2017 in most cases;the chord subjected to pressure or larger tensile forces will reduce the joint bearing capacity.Finally,the ranges of 2γ for different steel grades are recommended.Based on the plastic failure of the chord,the bearing capacity formula of CHS X-joints is proposed,considering the yield strengths of high-strength steel and the chord preload effect.关键词
高强钢系列/圆管X形节点/有限元分析/主管拉压效应/承载力Key words
high-strength steel series/circular hollow section(CHS)X-joints/finite element analysis(FEA)/chord preload effect/bearing capacity分类
建筑与水利引用本文复制引用
宁鹏,童乐为,朱小利..支管轴压下高强钢圆管X形节点的承载力计算公式[J].同济大学学报（自然科学版）,2024,52(1):49-58,85,11.基金项目
国家自然科学基金(51778457) （51778457）
