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为了研究Q235和Q460轴心受压焊接H形钢短柱高温下的局部稳定性能,采用恒温加载方式分别对6个Q235和6个(Q.460轴心受压焊接H形钢短柱试件进行常温和高温下的局部稳定性能试验,得到了常温和450、650℃下试件的翼缘和腹板局部稳定破坏形态,根据极限应变法和曲线拐点法确定试件在常温和高温下的临界荷载。采用我国现行《钢结构设计规范》和已有文献中关于局部稳定的计算方法计算试件的局部稳定临界应力,并和试验结果进行对比。研究表明:试件在高温下和常温下的破坏形态基本相同;与常温下局部屈曲承载力相比,高温下Q460高强钢试件的局部屈曲承载力较Q235普通钢试件下降幅度大;采用规范公式计算高温下焊接H形钢短柱翼缘和腹板的局部稳定临界应力与试验结果差别较大。
In order to study the local stability of Q235 and Q460 axial compression welded H-shaped steel columns under high temperature, six Q235 and six welded H-shaped steel specimens The stability test of the flanges and webs at room temperature and at 450 and 650 ℃ were carried out. The stability of the flanges and webs at normal temperature and 450,650 ℃ were obtained. According to the limit strain method and the curve inflection point method, the specimens were tested under normal temperature and high temperature The critical load is calculated by using the current “Design Code of Steel Structure” in our country and the calculation method of local stability in the existing literature, and compared with the experimental results. The results show that the specimens are stable under high temperature and normal temperature Compared with the normal buckling strength, the buckling strength of Q460 high-strength steel specimens at high temperature is larger than that of Q235 ordinary steel specimens. The standard H-shaped steel short columns The local stability critical stress of flange and web varies greatly with the test results.