论文部分内容阅读
以某斜靠式拱桥为工程背景,采用有限元软件MIDAS/Civil建立该桥的空间有限元计算模型,分析主要设计参数对斜靠式拱桥地震响应的影响。计算结果表明:斜靠拱与主拱刚度比的变化决定了斜靠拱对该斜靠式拱桥的作用;矢跨比变化对该斜靠式拱桥的顺桥向地震响应影响较大,尤其是对轴力和面内剪力的影响较大;横撑数量减少时,主副拱之间的连接变弱,使其整体性变弱,不仅削弱了斜靠拱对结构的作用,而且不利于斜靠自身受力。尼尔森体系吊杆形式使桥面系与拱肋的连接增强,使主拱肋的轴力变化均匀,同时增加了对桥面系的约束,可适当减小桥面系的位移。
Taking a leaning arch bridge as the engineering background, the finite element model of the bridge is established by using the finite element software MIDAS / Civil, and the influence of the main design parameters on the seismic response of the leaning arch bridge is analyzed. The calculation results show that the change of stiffness ratio of inclined arch and main arch determines the effect of inclined arch on the inclined arch bridge. The variation of sag-span ratio has a great influence on the seismic response of the inclined arch bridge, especially The impact on the axial force and in-plane shear force is large. When the number of bracing decreases, the connection between the main and auxiliary arches becomes weaker, which makes the integrity weak. This not only weakens the effect of the inclined arches on the structure, Lean on their own force. Nielsen system boom form bridge deck and arch rib connection to enhance the main arch rib axial force changes evenly, while increasing the constraints on the deck system, may be appropriate to reduce the displacement of the deck system.