【摘要】 编制了高强混凝土柱高温反应的全过程分析程序,程序中近似考虑了高强混凝土的爆裂效应,程序的有效性得到了其他学者试验结果的验证.针对不同轴压比、截面尺寸、配筋率和荷载偏心率共480种工况进行了高强混凝土柱的高温反应分析,揭示了各主要参数对高强混凝土柱耐火极限的影响规律,并与普通混凝土柱的相应结果进行了对比.基于计算结果定量给出了高强混凝土柱耐火极限的简化确定方法.研究结果表明,高温爆裂对高强混凝土柱的耐火极限影响显著;严格控制轴压比和荷载偏心率、保证足够的截面尺寸,是提高高强混凝土轴压柱和偏压柱耐火极限的有效措施.更多还原

【Abstract】 A full-process analytical program for high-strength concrete columns subjected to high temperature is proposed,in which the effect of explosive spalling of high-strength concrete is approximately considered.The reliability of the program is validated by the test results of other researchers.In order to reveal the effects of the main parameters on the fire resistances of high-strength concrete columns,480 specimens with different axial loading ra-(tios),cross-section dimensions,reinforcement ratios and load eccentricity ratios are selected to analyze the high-temperature reaction of the high-strength concrete columns.The results are then compared with those of common concrete columns.Moreover,a simplified way to quantitatively determine the fire resistance of high-strength concrete columns is presented based on the simulated results.It is indicated that the explosive spalling has significant inf-(luence) on the fire resistance of high-strength concrete columns,and that the fire resistance of the high-strength(concrete) columns with both central axial loading and eccentric axial loading can be effectively improved by reducing the axial loading ratio and the load eccentricity ratio,and by increasing the cross-section dimension.更多还原