圆管-方管混凝土T型节点疲劳性能试验研究  

Tests for fatigue behavior of welded CHS-SHS-concrete filled T-joints

作　　者：童乐为[1] 杨德磊[1,2] Zhao X L 

机构地区：[1]同济大学建筑工程系,上海200092 [2]黄淮学院建筑工程系,河南驻马店463000 [3]Department of Civil Engineering Monash University Clayton,VIC 3800

出　　处：《振动与冲击》2013年第3期99-105,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50478108)

摘　　要：基于热点应力法的管节点疲劳性能研究中,热点应力集中系数和疲劳寿命是描述焊接管结构节点疲劳性能的两个主要因素。对8个支管的圆管主管内填充C50等级混凝土方管节点试件(CT1～CT8)进行热点应力试验以确定其热点应力集中系数(SCF),在此基础上进行疲劳试验以确定其疲劳寿命(N3),将试验结果与具有相同几何尺寸和受力条件的圆管-方管节点试验结果及相关规范进行比较分析。研究表明,支管受轴向荷载下,圆管-方管混凝土节点与对应空钢管节点而言,节点区刚度分布明显改善,前者SCF最大值均小于后者SCF最大值,具有更好的抗疲劳性能;规范中关于空钢管节点疲劳性能的S-N曲线不适用圆管-方管混凝土T型节点的疲劳性能分析。Stress concentration factors（SCF） and fatigue life are two main aspects of studying fatigue behavior of tubular joints based on hot spot stress method. 8 welded CHS-SHS concrete filled T-joints were tested under static loading to determine stress concentration factors at hot spot locations and were also tested under cyclic loading to obtain fatigue life data. The results were compared with those for T-joints made of circular hollow section to square hollow section （CHS- SHS） and no concrete filled. The test results indicated that the CHS-SHS concrete filled T-joints exhibit evident improvements in rigidity distribution and have better anti-fatigue performance than the T-joints made of CHS-SHS and no concrete filled do; S-N curves of hollow section tubular T-joints in the relevant codes are not suitable for fatigue performance analysis of CHS-SHS concrete filled T-joints.

关 键 词：钢管混凝土节点 热点应力集中系数 疲劳寿命 疲劳试验 疲劳性能 

分 类 号：TU398[建筑科学—结构工程] O346[理学—固体力学]