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为研究受海洋环境钢筋锈蚀后混凝土柱的抗火性能,设计了5根足尺寸钢筋混凝土轴压柱进行试验。采用通电加速氯离子迁移的方式使混凝土柱锈胀开裂以模拟海洋环境损伤,以锈胀裂缝宽度作为损伤指标,控制通电时间使各柱锈胀裂缝宽度分别达到0.05,0.10,0.15,0.20 mm,并对各柱进行使用荷载下的四面受火试验。试验研究表明:在轴压比不变(本文中为0.2)的情况下,柱的裂缝宽度越大,其极限耐火时间越短;裂缝对试件截面经历的最高温度基本无影响;假定等温线与等温线间距正比例分布,基于此假设,对锈蚀钢筋混凝土柱高温下的轴心受压承载力进行计算,计算结果与试验实测值基本一致。
In order to study the fire resistance of reinforced concrete columns exposed to corroded marine environment, five full-size RC axial compression columns were designed and tested. Corrosion cracking of concrete columns was modeled by galvanic migration of chloride ions to simulate the damage of the marine environment. Taking the width of corrosion cracks as the damage index, the control of the energization time made the width of the corrosion cracks reach 0.05,0.10,0.15,0.20 mm, Each column was subjected to a fire test on all sides under a load of use. Experimental results show that the maximum crack width of the column decreases with the increase of the axial compression ratio (0.2 in this paper), and the crack has no effect on the maximum temperature experienced by the cross section of the specimen. It is assumed that the isotherm Based on this assumption, the axial compressive bearing capacity of corroded RC columns at high temperature was calculated. The calculated results are in good agreement with the experimental ones.