特殊配筋小跨高比洞口连梁的有限元模拟

已有试验研究表明,对角、菱形混合配筋的小跨高比洞口连梁的抗震性能优于普通配筋连梁,是一种比较理想的配筋方式.由于这种小跨高比连梁属于非伯努利区,正截面受力不符合平截面假定,传统的弯曲理论已不再适用,为此,通过运用非线性有限元程序进行模拟分析,对连梁内部钢筋的应力分布规律与试验结果进行了对比,确认了所用非线性有限元分析程序模拟这类连梁钢筋应力分布规律的有效性.

Finite Element Simulate Analysis of Small Span-to Depth Ratio Coupling Beams with Special Reiforcement

Test investigations show that the reinforcement scheme with adding diagonal and rhombic bars to traditional reinforcement in the foundation is an ideal way, for the seismic performance of small span-to depth ratio coupling beams with this scheme is better than that of traditional reinforcement. Because the regions in the small aspect ratio coupling beam belong to D-regions, in which the Bernoulli hypothesis of plane strain distribution is invalid, the traditional bending theory can not be used. This paper simulates the coupling beam through non-linear finite element analysis program, and contrasts the analysis result of the bar's stress distribution with test result. The contrast results confirm that it is a valid way to analyse the bar's stress distribution in this coupling beam through non-linear finite element analysis program.