摘要
假设悬索桥主缆自重沿弧长均匀分布,加劲梁、桥面等其余恒载沿水平均匀分布,导出悬索桥主缆成桥线形的参数方程。给出由边界条件确定参数方程未知量与通过改变参数确定主缆成桥吊点坐标的方法。由积分法导出成桥状态无应力索长的计算公式。根据成桥状态与空缆状态各跨无应力索长不变这一原则,建立了确定空缆状态主缆水平张力、索鞍预偏量的计算方法,然后再根据成桥状态与空缆状态吊点间的无应力索长不变确定空缆吊点坐标。算例结果表明本文方法具有适合程序计算、收敛速度快,计算精度较高的特点,可用于悬索桥设计与施工控制计算。
Suppose that self-weights of main cables of suspension bridge are uniformly distributed along arch length and the rest dead loads including stiffened girder and bridge deck etc are uniformly distributed along horizon,parameter equations of the main cable's profile of suspension bridge after completion are obtained.The horizontal component of the cable tension force and the parameter at the end point are determined according to the boundary conditions.Then the hanging point's coordinates of main cables after completion are determined by changing the parameters.By use of integration method derives the calculation formulas of the unstressed cable length.The horizontal component of the tension force of free cable and the pre-displacement of tower saddles are calculated according to the equality of the unstressed cable length for all spans between the free cable and the completed cable.The hanging point's coordinates of free cable are calculated according to the equality of the unstressed cable length between the adjacent hanging points.The results of an example show that this method is easy for programming with rapid convergence and very accurate.So this method can be used in the calculation of design and construction of suspension bridges.
出处
《公路交通科技》
CAS
CSCD
北大核心
2004年第11期55-58,共4页
Journal of Highway and Transportation Research and Development
关键词
悬索桥
主缆
参数方程
无应力索长
吊点坐标
Suspension bridge
Main cable
Parameter equation
Unstressed cable length
Hanging point's coordinates
