地基梁配筋设计方法研究

Reinforcement design for beam on foundation

采用非线性钢筋混凝土有限单元法,同时考虑工作和钢筋混凝土的材料非线性特性,对较多地基梁算例进行了有限元计算,得出地基梁和位移随钢筋用量的变化规律,并根据该规律指出地基梁可不进行承载能力极限状态计算,钢筋用量由正常使用极限状态允许裂缝宽度来确定的概念,给出了地基梁裂缝宽度计算公式,形成了新的地基梁配筋设计方法.

In consideration of the nonlinearity of soil and reinforeed concrete, a lot of beams on foundation are analyzed by use of reinforced concrete finite element method for evaluation of influences of reinforcement ratio on behavior of the beams. According to the regulation of bending moment and displacement of beams varying with the reinforcement ratio obtained in above research, a new reinforcement design method for beams on foundation is put forward, in which the amount of reinforcement is determined only based on the allowable crack width of beams in serviceability limitid state, while the ultimate strength design is not required. Moreover, the formula for calculation of crack width of beams on foundation is also derived.