矩形钢管混凝土双向偏压构件计算方法

摘要

在纤维模型法的基础上建立了能够考虑双向偏压构件截面变形轴扭转的计算矩形钢管混凝土双向偏压构件承载力和变形的方法.根据本文的计算方法编制了非线性分析程序,程序计算结果跟试验结果进行了对比,吻合良好.试验结果跟欧洲规范4和国内的矩形钢管混凝土结构技术规程进行了对比,对比结果表明由两种规范计算矩形钢管混凝土双向偏压构件的轴向承载力(Nu)偏高于试验结果.%A new method to simulate the load-deflection responses of concrete-filled rectangular hollow section (RHS) columns under biaxial eccentric load with special consideration on the effect of cross-sectional neutral axis rotation based on fiber model. A nonlinear analysis program was developed and the analysis results were compared with the experimental results;they agreed well with each other. The experimental results were also compared with the results predicted from Eurocode 4 and the Technical Specification for Concrete-filled RHS in China,and it was found that the predicted results for biaxially eccentrically loaded concrete-filled RHS columns from EC4 and the technical specification exceeded the experiment results.