钢管混凝土斜靠式拱桥静力性能及参数分析  

Analysis for the influence of structural parameters on static characteristics of CFST double X-shape arch bridge

作　　者：陈峰[1] 贺拴海[1] 胡大琳[1] 范伟擎 

机构地区：[1]长安大学公路学院旧桥检测与加固技术交通行业重点试验室,陕西西安710064 [2]深圳市光明新区城市建设局,广东深圳518106

出　　处：《广西大学学报（自然科学版）》2011年第1期107-112,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：国家山区公路工程技术研究中心开放基金(gsgzj-2010-01);旧桥检测与加固技术交通行业重点试验室开放基金(CHD2009JC041)

摘　　要：为研究斜靠式钢管混凝土拱桥的结构受力特点以及稳定特征,以一座拟建的大跨径斜靠式拱桥为例,分析了其主要结构参数(矢跨比、吊杆间距、斜拱倾角、横撑数量及位置)对结构静力性能的影响。经过结构参数对比计算分析发现:当矢跨比由1/5变化至1/6时,内力值将出现较大幅度增加;吊杆间距的增大和横撑数量的减少对斜拱受力不利;倾角的减小对主拱、系梁和斜拱受力不利;拱脚横撑对于结构内力改善作用最大。稳定屈曲分析结果表明,其结构失稳模态为拱肋面外侧倾失稳,结构屈曲稳定安全系数与矢跨比和斜拱倾角近似成正比,吊杆间距对结构恒载和稳定性影响较大,拱脚处横撑对于稳定性作用最大。分析结果为斜靠拱设计提供了结构参数选取的建议,为此类桥梁的设计提供有利的参考。In order to study the static characteristics and the stability features of concrete-filled steel tubular（CFST）double X-shape arch bridges,a 100 m span bridge to be constructed is analyzed.The influence of the key structural parameters（the ratio of rise to span,the distance between the suspenders,the rake angle of inclined arch,the number and location of transverse braces） on the internal force of the entire bridge is analyzed.The results show that： when the ratio of rise to span changes from 1/5 to 1/6,the internal force will increase largely;the increase of the distance between the suspenders and the decrease of the number of the transverse braces will increase the internal force of the inclined arch;the decreased skew angle of the inclined arch will increase the internal force of the main arch,tie beam and inclined arch;the springer transverse brace is the most important factor for the improvement of stability of the structure.The stability analysis results show that the instability modes of the bridge are out-of-plane.The stability coefficient is proportional to the rise/span ratio and the skew angle of the inclined arch.The distance between the suspenders has large influence on the dead load and stability of the bridge.The results also recommend some structural parameters for the design of bridges of this sort.

关 键 词：斜靠拱 空间效应 结构参数 静力性能 稳定屈曲分析 

分 类 号：U442[建筑科学—桥梁与隧道工程]