摘要
为了正确评估钢筋混凝土(RC)偏压构件在压力和弯矩共同作用下的承载能力,建立了分段光滑的压弯承载力相关方程的显性表达式。首先考虑相关方程一阶导数在界限点连续的条件,利用二次分段光滑函数建立了适用于大、小偏心受压状态的承载力相关方程;其次,通过重新定义轴压承载力调整系数,使承载力相关方程能够合理反映大、小偏压构件的破坏机理,且能够平稳回归到轴压点和纯弯点,从而正确表达RC构件在轴压、偏压和纯弯3种受力状态下的承载力,克服了基于现行规范承载力计算公式推导建立的相关方程以及现有文献中相关方程的缺陷;最后利用纤维模型法与119组偏心受压构件的承载力试验数据验证了所建立的承载力相关方程在不同截面参数和偏心率下具有较高的计算精度和广泛的适用性。
In order to evaluate the bearing capacity of reinforced concrete members under combined action of compression and bending,the explicit expression of piecewise-smooth interaction equation is developed in this paper.Firstly,considering the continuity of the interaction equation and its first-order derivative at the balance point,the piecewise-smooth quadratic function is used to establish the interaction equation for both large and small eccentric compression.Then a new adjustment coefficient is defined for compressive strength of the RC member while the bearing capacity interaction equation is consistent with the failure mechanism of large and small eccentric compression members.The proposed interaction equation agrees well with the axial compression point and the pure bending point,so that the three stress states of axial compression,eccentric compression and bending can be expressed accurately by the proposed interaction equation,which overcomes the defects of the design code based on interaction equation and the interaction equation from related reference.Finally,results from the fiber section model and 119 sets of test data of eccentric loaded members are adopted for comparison with the results from different interaction equations.The results show that the piecewise-smooth interaction equa-tion proposed in this paper achieves higher calculation accuracy and wide applicability under different section parameters and eccentricity ratio.
作者
陈致
杨绿峰
郑健
CHEN Zhi;YANG Lufeng;ZHENG Jian(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Guangxi University,Nanning 530004,China;Guangxi Road and Bridge Engineering Group Co.,Ltd.,Nanning 530010,China)
出处
《桂林理工大学学报》
CAS
北大核心
2023年第4期624-630,共7页
Journal of Guilin University of Technology
基金
国家自然科学基金重点项目(51738004)。
关键词
钢筋混凝土
承载力相关方程
偏压
调整系数
纤维模型
reinforced concrete
bearing capacity interaction equation
eccentric compression
adjustment co-efficient
fiber section model
作者简介
陈致(1993-),男,硕士,研究方向:钢筋混凝土结构承载力,zchen9302@foxmail.com。;通讯作者:杨绿峰,博士,教授,lfyang@gxu.edu.cn。
