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在标准耐火试验条件下,对5个足尺圆形和方形不锈钢管混凝土柱(CFSST)进行轴向压缩试验,以研究其性能。外管采用S30408级(EN 1.4301或AISI 304)奥氏体不锈钢,核心混凝土采用自密实混凝土。试验参数包括荷载水平、截面类型和尺寸。对试件的截面温度分布、轴向变形和抗火性进行了测试和总结,建立有限元模型进一步研究高温下CFSST柱的破坏机理。最后,将CFSST柱的变形发展和失效模式与钢管混凝土柱进行比较,研究两种组合柱抗火性能的差异。
Under standard fire test conditions, five full-scale circular and square stainless steel concrete columns (CFSST) were subjected to axial compression tests to investigate their properties. The outer tube is made of S30408 grade (EN 1.4301 or AISI 304) austenitic stainless steel and the core concrete is self-compacting concrete. The test parameters include load level, section type and size. The cross-section temperature distribution, axial deformation and fire resistance of the specimens were tested and summarized. The finite element model was established to further study the failure mechanism of CFSST columns under high temperature. Finally, the deformation development and failure modes of CFSST columns were compared with CFST columns to study the difference of fire resistance between the two composite columns.