复合荷载作用下完全叠接管节点热点应力的实验研究  

Experimental Study on Hot Spot Stress of Completely Overlapped Tubular Joints Under Combined Loadings

作　　者：高飞[1] 朱宏平[1] 章小蓉[1] 

机构地区：[1]华中科技大学土木工程与力学学院

出　　处：《华中科技大学学报（城市科学版）》2007年第3期40-44,共5页Journal of Huazhong University of Science and Technology

基　　金：教育部新世纪优秀人才计划资助项目(2004年);湖北省建设科技项目计划资助项目(K200619);华中科技大学校科学研究基金资助项目(2006Q002B)

摘　　要：通过实验研究了完全叠接管节点试件在复合荷载作用下的热点应力。首先研究了完全叠接管节点试件在轴力、平面内弯矩和平面外弯矩分别作用下的应变集中因子,结果表明在轴力和平面外弯矩作用下,该管节点试件的最大应变集中因子产生在靠近L支管的T支管的鞍部,而在平面内弯矩作用下,该管节点试件的最大应变集中因子则产生在L支管的冠跟部。随后,研究了完全叠接管节点试件在复合荷载作用下的热点应力,结果表明在复合荷载作用下最大热点应力可能出现在介于鞍部和冠部之间的任一位置。通过Gulati等和API所提出的复合荷载作用下的叠加方程与实验结果比较,发现Gulati等所提出的方程与实验结果吻合得很好,而API所提出的方程则偏于保守。The hot spot stress （HSS） of completely overlapped tubular joints was investigated experimentally under combined loadings. A completely overlapped tubular joint specimen was first tested under axial loading, in-plane and out-of-plane bending to determine the stress concentration factor （SNCF）. The experimental results show that the maximum SNCF of the joint occurs at the through brace saddle near the lap brace under axial loading out-of-plane bending, and at the lap brace crown heel under in-plane bending. The peak HSS of the completely overlapped tubular joint under combined loading can occur at a position between the crown and the saddle of members. A comparison of HSS shows that the equation proposed by Gulati et al. agrees reasonably well but the design recommendation by API, over predicts the test data.

关 键 词：完全叠接管节点 应力集中因子 应变集中因子 复合荷载 

分 类 号：TU398[建筑科学—结构工程]