论文部分内容阅读
几何非线性与徐变均为大跨或高耸柔性混凝土结构分析中必须考虑的重要因素,而现有计算方法通常只单独考虑,而未考虑两者的共同作用。基于几何非线性分析的随转坐标法和徐变效应分析的初应变法,该文首先建立三维梁元在随转坐标系下计入初应变效应的几何非线性平衡方程;再利用静力平衡原则,导出三维梁元在结构坐标系下同时考虑几何非线性与徐变的平衡方程,提供了详细的分析流程,编制了相应的非线性计算程序。以某大跨径混合梁斜拉桥混凝土桥塔为例,进行了考虑混凝土徐变效应的几何非线性分析;结果表明,无论是几何非线性还是徐变,单独考虑时得到的内力和位移结果均小于考虑两者共同作用得到的结果,因此在大跨或高耸柔性混凝土结构分析中考虑几何非线性与徐变共同作用是很有必要的。
Geometrical nonlinearity and creep are the important factors that must be considered in the analysis of long-span or tall flexible concrete structures. However, the existing methods are usually only considered independently without considering the mutual effect of the two. Based on the initial strain method of random coordinate analysis and creep effect analysis based on geometric nonlinear analysis, this paper first establishes the geometric nonlinear equilibrium equation of three-dimensional beam element under the initial strain effect under the rotation coordinate system. Principle, derive the three-dimensional beam element in the structural coordinate system while taking into account the geometric nonlinearity and creep of the equilibrium equation provides a detailed analysis of the process, the preparation of the corresponding non-linear calculation program. Take the concrete bridge tower of a long-span hybrid cable-stayed bridge as an example, the geometric nonlinear analysis considering the creep effect of concrete is carried out. The results show that both the internal force and the displacement result obtained when considering the geometrical nonlinearity or creep separately Are less than the result obtained by considering both of them. Therefore, it is necessary to consider the interaction between geometric nonlinearity and creep in the analysis of long-span or tall flexible concrete structures.