冷弯不锈钢管T形节点的试验研究

Experimental Investigation of Cold-Formed Stainless Steel Tubular T-Joints

对冷弯不锈钢管T形节点进行试验研究,这些节点由方矩形中空截面的支撑和弦杆构成。对高强不锈钢(双相和高强度奥氏体)和普通强度不锈钢(AISI304)构件进行了测试,共进行了22个试验。试验方法:将支撑对弦杆正面所导致的全部集中力,沿试件长度施加到弦杆上。支撑和弦杆的宽度比值(β)范围为0.5～1.0,这样可以观察到弦杆正面和侧面的失效模式。将试验结果与采用澳大利亚/新西兰不锈钢结构设计标准、CIDECT和欧洲碳素钢结构设计规范的设计方法相对比。对比结果显示:采用0.1%,0.2%,0.5%和1.0%的弹性极限应力作为屈服应力,按照这些规范计算出来的设计强度略微保守。相对而言,0.2%的弹性极限应力比较适用于预测不锈钢管T形节点在使用和极限状态下的设计强度。

This paper describes a test program on a wide range of cold-formed stainless steel welded tubular T-joints fabricated from square and rectangular hollow section brace and chord members. A total of 22 tests was performed, High strength stainless steel （duplex and high strength austenitic） and normal strength stainless steel （AISI 304） specimens were tested. The tests were performed by supporting the chord member of the specimen along its entire length with the pure concentrated force applied to the chord face by the brace member, The ratio of brace width to chord width （J3） of the specimens varied from 0.5 to 1.0 so that failure modes of chord face failure and chord side wall failure were observed, The test results were compared with the design procedures in the Australian/New Zealand Standard for stainless steel structures, CIDECT and Eurocode design rules for carbon steel structures. It is shown that the design strengths predicted by the current design specifications are conservative for the test specimens calculated using the 0. 1%, 0. 2%, 0. 5% and 1.0% proof stresses as the yield stresses. The 0.2% proof stress is comparatively more reasonable to predict the design strengths of stainless steel welded tubular T-joints for both ultimate limit state and serviceability limit state. In this study, it is shown that theultimate limit state controls rather than the serviceability limit state for most of the test specimens.