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介绍高温下再生骨料钢管混凝土(RACFST)短柱性能的试验研究结果。试验采用了40个试样(其中32个RACFST短柱,8个普通钢管混凝土(CFST)短柱),给出并分析了试样的失效模式、荷载-应变关系和极限强度。采用了5种类型的混凝土:1种天然骨料的标准混凝土;2种再生粗骨料,含量分别为50%和100%;2种再生细骨料,含量分别为50%和100%。试样分别置于300℃,600℃和800℃条件下长达3h。试验结果表明,由于再生骨料的存在,高温下RACFST短柱试样的抗火性低于CFST短柱试样;再生骨料含量相同的条件下,再生粗骨料(RCA)试样的性能优于再生细骨料(RFA)试样。
The results of the experimental study on the properties of short columns of recycled aggregate concrete filled steel tubular (RACFST) under high temperature were introduced. 40 specimens (32 short stubs of RACFST and 8 CFST stubs) were used in the test. The failure mode, load-strain relation and ultimate strength of the specimens were given and analyzed. Five types of concrete were used: one type of standard concrete with natural aggregates; two kinds of recycled aggregates with contents of 50% and 100% respectively; and two kinds of regenerated fine aggregates with contents of 50% and 100% respectively. Samples were placed 300 ℃, 600 ℃ and 800 ℃ conditions for up to 3h. The experimental results show that the fire resistance of RACFST stub columns at high temperature is lower than that of CFST stub columns due to the presence of recycled aggregates. When the content of recycled aggregates is the same, the properties of RCA samples Better than the regenerated fine aggregate (RFA) sample.