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给出一系列冷弯不锈钢管X形节点的试验数据。这些X形节点上的弦杆分为无预应力弦杆和预应力弦杆两种,其中预应力弦杆包括三种水平的预应力。支撑杆和弦杆为方钢管或矩形钢管。共完成32组试验,其中构件材料采用高强度不锈钢(高强奥氏体钢)和普通不锈钢(AISI 304)。将试验结果与CIDECT欧洲规范中碳素钢的设计强度进行比较,结果显示:采用0.1%,0.2%,0.5%和1.0%的试验应力作为屈服应力,对于由现行规范得到的设计强度值是相对保守的;采用0.2%的试验应力预测承载能力极限状态和正常使用极限状态下不锈钢管X形节点的设计强度值,是相对合理的。
A series of experimental data of X-shaped joints of cold-formed stainless steel tube are given. The chords on these X-shaped nodes are divided into two types: prestressed chord and prestressed chord. Prestressed chord includes three levels of prestress. Support rods and chords for the square tube or rectangular steel pipe. A total of 32 sets of tests were completed, of which component materials were high-strength stainless steel (high-strength austenitic steel) and stainless steel (AISI 304). The results of the tests were compared with the design strengths of carbon steels in the CIDECT Eurocode. The results show that the test stresses of 0.1%, 0.2%, 0.5% and 1.0% are used as the yield stress for the design strength values obtained from the current codes Conservative; using 0.2% of the test stress to predict the ultimate strength of the carrying capacity and the limit of the normal use of stainless steel tube X-shaped node design strength value is relatively reasonable.