【作者】 易建龙； 李常虹； 陈水福；

【Author】 Yi Jianlong, Li Changhong, Chen Shuifu (Zhejiang Hangxiao Steel Structure Co. , LTD. , Hangzhou 310003 China; Guangxi Province Architectural Design and Research Institute, Nanning 530011, China; Department of Civil Engineering, Zhejiang University, Hangzhou 310027 , China)

【机构】 浙江杭萧钢构股份有限公司； 广西省建筑设计院； 浙江大学土木系；

【摘要】 建立了一种基于离散纤维元的数值迭代计算机方法,对钢筋混凝土偏压柱在火灾作用后的荷载-挠度全过程曲线和极限承载力进行了数值模拟,通过对材料强度、含钢量、偏心率、长细比、截面尺寸和爆火时间等因素的参数分析,发现长细比、截面尺寸和爆火时间对火灾后构件的残余强度有更显著的影响。实例计算表明,该计算方法精度好,效率高,可直接用于火灾后钢筋混凝土柱极限承载力的验算和复核。更多还原

【Abstract】 A computer-based iterative numerical method was proposed for prediction of the full load-deflection curve and ultimate load capacities of reinforced concrete ( RC ) columns after fire. Through analysis of several influence factors including the material strengths, steel ratio, load eccentricity ratio, slenderness ratio, cross-sectional dimension and the fire duration time on the ultimate load capacity of the column, it was found that the slenderness ratio, cross-sectional dimension and fire duration time have more significant influence on the residual strength of the column after fire. Numerical examples are presented. The obtained results indicate that the present method is accurate and efficient and applicable to determine and check the ultimate strengths of RC columns after fire.更多还原