不同本构关系对圆截面偏压承载能力影响分析

Analysis of eccentric compression bearing capacity of circular-section with different constitutive relation

基于混凝土常用应力-应变曲线方程,对混凝土圆形截面偏心受压构件承载能力进行理论分析,得到承载能力的一般表达式。选取GB50010—2002《混凝土结构设计规范》、欧洲规范以及Hognestad三者建议的应力-应变关系,计算得到各模型的承载能力理论值,并将各模型的理论值与实验测试值进行对比分析。研究结果表明:欧洲规范模型承载能力的理论值略大于其他2个模型的5.5%;欧规模型理论结果相对于实验测试结果的波动性较其他2个模型的波动性最小,为0.04;各模型的理论结果相对于实验测试结果均偏安全。

On the basis of the common stress -strain curve equation of concrete,theoretical analysis of bearing capacity of eccentric compression component of concrete circular section was made,and a general formula for bearing capacity was derived.Three kinds of stress -strain models,proposed by Standards of Concrete Structure Design,European Standards and Hognestad respectively,were employed to calculate theoretical values of bearing capacity of all models.In addition,theoretical values of three models and experimental values were compared and analyzed.The results show that theoretical value by calculation of European Standards is slightly larger by 5. 5 percent than that of others,and volatility of theoretical values of European Standards is less than that of other two models.In addition,theoretical values of bearing capacity of all models are more secure than experimental results.