弹性支承圆弧钢浅拱弹塑性极限承载力分析

摘要

Many arch structures are supported against other structures in practical engineering.The constraint which is provided by the substructure is not perfectly rigid so that the constraint can be equivalently replaced by horizontal spring and rotational spring.The parametric analysis of I-section circular arch with horizontal and rotational elastic support is conducted by the finite element analysis software ANSYS,considering the initial defects,geometrical nonlinearity,and material nonlinearity.The elastic-plastic ultimate bearing capacity of the horizontal and rotational elastic support arch under different load conditions and the support displacement of arch foot at limit state are studied in this paper.The existing design formula are revised through a large number of finite element calculations.%实际工程中许多拱结构支承于其他结构之上,下部结构对拱脚的约束并非完全刚性,在这种情况下拱脚约束可以简化为水平和转动弹性约束.采用ANSYS有限元分析软件,在考虑初始缺陷、几何非线性和材料非线性的基础上,针对工字形截面水平和转动弹性支承圆弧钢拱进行了参数化分析.研究了不同荷载工况下水平和转动弹性支承拱的弹塑性极限承载力、极限状态下拱脚的支座位移,对已有的设计公式进行了修正.