考虑轴力作用下的型钢-混凝土组合梁抗弯承载力计算  

Bending Capacity Calculation of Steel Reinfoned Concrete Composite Beams Considering Axial Force

作　　者：许绮炎 刘全林 毕平均 XU Qiyan;LIU Quanlin;BI Pingjun(Shanghai Qiangjing Foundation Engineering Co.,Ltd.,Shanghai 201806,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]上海强劲地基工程股份有限公司,上海201806 [2]同济大学土木工程学院,上海200092

出　　处：《工业建筑》2022年第5期120-125,共6页Industrial Construction

摘　　要：为解决基坑钢支撑体系中型钢-混凝土组合梁的承载力计算问题,基于塑性设计理论及若干假定,推导出考虑轴力作用下的钢-混凝土组合梁的抗弯承载力计算公式,公式具有普遍适用性,并与试验结果对比,两者吻合较好,表明本文给出的计算公式是可靠的。对计算公式进行归纳、统一,表明当轴力变化时,M;-δ(轴力作用点和塑性中和轴之间的距离)是一条或由多条二次抛物线组成的曲线,且抛物线开口向下。δ越小,M;越大,当δ等于零时,承载力最大,并给出相应的轴力计算公式。M;-N曲率主要由组合梁宽度、材料强度决定,其值越大,曲率越小,曲线越平。In order to solve the bearing capacity calculation problem of the steel reinforced concrete composite beam in steel support system of foundation excavation,based on the plastic design theory and several assumptions,the calculation formulas for the bending capacity of the steel-concrete composite beam under axial force were derived,which had universal applicability,and the calculated results were in good agreement with the test results,indicating that the calculation formulas given in the paper were reliable.The formulas were summarized and unified,it was found that when axis forces changed,M;-δ(the distance between the axial force action point and plastic neutral axis)curve ws composed of one or more quadratic parabolas,and the parabolas opened downward.The smallerδ,the larger M;.Whenδwas equal to zero,the bending capacity reached the largest,and the corresponding axial force calculation formulas were given.The curvatured of the M;-N curve was mainly determined by the width and strength of composite beam.The greater the material strength and width,the smaller the curvature,the flatter the curve.

关 键 词：钢支撑 型钢-混凝土组合梁 轴力作用 抗弯承载力 塑性中和轴 

分 类 号：TU398.9[建筑科学—结构工程]