摘要
为了研究构件参数对恒载状态力学特性的影响,依托实际工程,采用大型有限元程序对自锚式悬索桥恒载状态进行建模分析,结果表明:主缆刚度主要表现为重力刚度,轴向刚度(弹性刚度)所占比重较小,对恒载状态力学特性影响较小;加劲梁刚度对恒载状态的力学特性有一定影响,作用在加劲梁上的荷载,由主缆和加劲梁共同承担,加劲梁刚度的增加,使其"梁"的效应增强,分担的荷载增大,而吊索传递给主缆承受的荷载相应减小;主缆承担了较大部分的加劲梁恒载和自身恒载,是主要承重构件,加劲梁由于跨度较大,"梁"的效应较弱,承担了较小部分的自身恒载,是次要的承重构件,加劲梁恒载对自锚式悬索桥恒载状态力学特性影响较大。
In order to study the influence of component parameters on the mechanical property of constant load state and relying on the actual projects, the large finite element program is used to establish the model for analyzing the constant load state of self-anchorage suspension bridge. The result shows that the rigidity of the main cable is mainly the gravity rigidity. The axial rigidity(elastic rigidity) accounts for a smaller proportion and has little influence on the mechanical property of constant load state. The rigidity of stiffening girder has a certain influence on the mechanical property of constant load state. The load action is on the stiffening girder, and is undertaken by the main cable jointly with the stiffening girder. The rigidity increment of stiffening girder makes its "girder" effect strengthen, and the shared load increases. The load transmitted from the sling to the main cable is relevantly decreased. The main cable bears the most constant load of stiffening girder and itself constant load, and is the main load-bearing member. The "girder" effect of stiffening girder is weaker because of its longer span. It bears the small part of itself constant load, and is the secondary load-bearing member. The constant load of stiffening girder has a larger influence on the mechanical property of constant load of self-anchorage suspension bridge.
出处
《城市道桥与防洪》
2018年第12期66-69,共4页
Urban Roads Bridges & Flood Control
关键词
自锚式悬索桥
构件参数
恒载状态
力学特性
self-anchorage suspension bridge
component parameters
constant load state
mechanical property
