箱涵刚域效应研究

Study on the Rigid Zone Effect of Box Culvert

箱涵刚域效应是指结构在节点处,由于构件相交而存在的性质特殊的区域,该区域的相对抗弯刚度趋近无限大,呈现出不可变形的特性,从而对结构受力和变形产生影响的现象。为研究刚域效应对箱涵结构的影响,对箱涵进行受力和变形的特性分析,确定刚域及其判定方法。以箱涵的基本参数和加腋特征参数为变量,分析箱涵结构刚域效应的规律。并对比分析考虑刚域效应后结构变形和内力结果,经分析确定出顶板和侧墙的刚域范围与结构尺寸之间的比例关系,以及加腋构造的最优坡度。考虑刚域效应后的变形和内力值较小,可以减小钢筋用量,降低工程造价。

The rigid zone of box culvert refers to the region where the structure intersects at the node,and the relative bending stiffness of the zone is infinitely large. It exhibits non-deformable properties,which results in the deformation of the structure Impact. In order to study the rigid zone of box culvert,the characteristics of force and deformation of box culvert are analyzed,and the rigid zone and its judgment method are determined based on the basic parameters of box culvert. Haunch layout parameters as taken as variables to analyze the law of rigid domain effect of box culvert structure. The ratio between the rigidity domain and the structural dimension of the roof and side walls,and the optimum slope of the haunch layout are determined by analysis. With the effect of the rigid zone,the deformation and internal force are smaller and the amount of steel bar can be reduced to lower the project cost.