混凝土条形基础设计研究  

Research on the design of strip footing with concrete

作　　者：刘伟[1] 杨卫忠[1] 王娱[2] 

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]郑州大学综合设计研究院有限公司,河南郑州450002

出　　处：《四川建筑科学研究》2014年第5期130-134,共5页Sichuan Building Science

基　　金：国家自然科学基金项目(U1204502);河南省重点科技攻关项目(132102310447)

摘　　要：混凝土条形基础受力类似于悬臂梁,墙或基础梁是其嵌固端,而向上的土压力则是作用在梁上的荷载。结合现行《建筑地基基础设计规范》和《混凝土结构设计规范》的规定,对条形基础的剪切承载力、内力臂系数、钢筋充分利用点等关键问题进行研究。研究表明,无筋条形基础在满足抗弯承载力的前提下可不必验算抗剪承载力,而钢筋混凝土条形基础的内力臂系数可取0.95,二分之一钢筋的理论切断点可偏于安全取为距端部的0.58倍悬挑长度处,研究成果为此类基础设计和规范修订提供参考。The concrete strip footing behaves similarly to a cantilever beam,where the cantilever extends out from the wall or foundation beam and is loaded in an upward direction by the soil pressure. Based on the China Code GB50007--2011 and GB50010--2010, some key questions such as load-carrying capacity and cut-off are studied. It is found that the flexure is more important than the shear in checking of load-carrying capacity for a wall footing with plain concrete. The lever-arm and theoretical cut-off with half of reinforcements are deduced. The results may be as reference in footing design and code revising.

关 键 词：混凝土 条形基础 控制截面 内力臂系数 理论切断点 

分 类 号：TU47[建筑科学—结构工程]