基于分层壳元法多梁式T梁的极限承载力评估

基于分层壳元法,对钢筋混凝土多梁式T梁的极限承载力问题进行了研究。建立实体退化壳元模型后,推导了壳元位移场,用分层壳元模拟了多梁式T梁。基于Owen理论考虑了混凝土的材料非线性,并基于V.Karman假设考虑了结构的几何非线性。通过多梁式T梁实例分析,结果表明,应用分层壳元法能正确地进行多梁式T梁的非线性分析,能有效地评估结构的极限承载力,且支承形式对多梁式T梁的极限承载力有很大影响,研究表明应选择修正的铰支-弹性支承形式。

Analysis of Ultimate Loads of Multi-T Girders Based on Layered-shell Element Method

Based on layered-shell element method, ultimate loads of reinforced concrete muhi-T girders are calculated.After the modeling of degraded shell element is established, displacement fields of shell element are deduced and by using layered-shell element, multi-T girders are modeled.Based on Owen theory and V.Karman supposition, the material nonlinear behavior of concrete and the geometry nonlinear behavior of multi-T girders are considered. Through analysis of a practical example of multi-T girders, it shows that the nonlinear analysis of multi-T girders can be rightly completed by using layered-shell element method, which helps to estimate the ultimate loads efficiently. And the results also show that the manner of modeling of support condition significantly affects ultimate loads of the multi-T girders and that of hinge-spring support condition is proper.