摘要
研究目的:本文以某一无风撑三跨连续系杆拱桥为例,该桥的桥面较宽,横桥向设置三排支座,由此横梁变形及受力有所减小,但导致结构的刚度加大,增大了拱桥系杆在恒载、活载作用下绕桥梁中心线的内力,致使系杆在拱脚附近的扭转剪应力过大,导致系杆受力不尽合理,为寻求改善拱桥系杆受力的方法,于文中展开详细的分析及探讨。研究结论:分析结果表明:(1)调整中墩支座的安装顺序对结构受力会产生一定的影响;(2)吊杆终拉后再进行中墩支座的安装,可使应力得以提前释放,待横梁变形稳定后再进行中墩支座的安装。能够有效地减小系杆的扭转剪应力,使系杆斜截面主拉应力数值下降,系杆受力得到改善;(3)该研究结论适用于无风撑且桥面较宽的系杆拱桥的设计及相关计算分析。
Research purposes： A three span tied arch bridge without wind bracing was studied. This bridge is wider than normal arch bridge. In order to reduce the deformation and stress of the crossbeam, three bearings were set through the direction across the bridge. Through that way, the stiffness of the structure is increased. The tie bar has a bigger torsion towards the bridge deck under the dead load and the live load. According to this, the tie bar has much bigger shear stress near the arch springing and it makes the stress of tie bar unreasonable. Research was made in this paper to find a solution to solve this problem. Research conclusions： Results show that： （1） The construction order of the supports can affect the structural performance. （2） Install the middle supports after the suspenders finally stretched and the displacement of the cross beam tends to be stable which could release the stress of the tie bar. In that way, the shear stress of the tie bar caused by torsion and the principal tensile stress were efficiently decreased and finally it could meet the need of the standard. （3） This conclusion could be used for design, calculation and analysis of tied arch bridge without wind bracing.
出处
《铁道工程学报》
EI
北大核心
2015年第8期55-59,80,共6页
Journal of Railway Engineering Society
关键词
系杆拱桥
风撑
主拉应力
剪应力
系杆
拱脚
扭转
tied arch bridge
wind bracing
principal tensile stress
shear stress
tie bar
arch springing
torsion
