圬工拱桥加固与加载程序优化方法-学兔兔 www.xuetutu.com.pdf

桥梁建设2013年第43卷第6期(总第223期
Bridge Construction, Vol 43, No 6, 2013 (Totally No 223)
文章编号:1003-4722(2013)06-0088-06
圬工拱桥加固与加載程序优化方法
刘思孟2,张立永
(1,重庆交通大学土木建筑学院,重庆400074;2.重庆大学土木工程学院,重庆400045)
摘要:为满足圬工拱桥施工阶段的结构安全并使其加固后处于更优的承载状态,提出采用
平波法优化圬工拱桥的加固与加載程序。从圬工拱桥的极限承载力计算方法入手,推证拱圈載面
承載力是栽面合力偏心距e的单调减函数。在此基础上,以截面合力偏心距e及其容许值[ea]之
差作为主要控制变量,引入并借助偏心距影响线的概念,通过调整加固、加载程序将阶线图中的波
峰或波谷“烫平”,使所有施工阶段中的e不超限且変化平稳、均匀。以重庆市某县乌江大桥(一座
两孔净跨100m的圬エ拱桥)加固程序优化为例,验证了平波法的有效性。
关键词:拱桥;圬工桥;加固;加载;程序优化;平波法;偏心距影响线
中图分类号:U448.22;U445.72文献标志码:
Optimizing Method for Strengthening and Loading
Program of Masonry Arch Bridge
LIU Si-meng", ZHANG Li-yong
School of Civil Engineering and Architecture, Chongqing Jiaotong University, Chongqing 400074
China: 2. School of Civil Engineering, Chongqing University, Chongqing 400045, China)
Abstract; To ensure the structural safety of masonry arch bridge at the strengthening con
struction stages and to keep the bridge in a still better bearing state after it was strengthened, the
smooth crest method was proposed for optimizing the strengthening and loading program of the
bridge. Proceeding from the calculation methods for the ultimate bearing capacity of the bridge
the sectional bearing capacity of the arch rings was derived to be the monotonic decreasing func-
tion of the eccentric distance e of the sectional resultant force. On the basis of the derivation, the
differences between the eccentric distance e and its allowable value [eo] were taken as the main
control variables, the conception of influential lines of the eccentric distance was introduced and
by adjusting the strengthening and loading program, the wave peaks and wave valleys in th
stage-varied line diagram were "flattened "and the e values of all construction stages were made
not to exceed the limit and also made to change stably and uniformly. Finally, the optimizing of
the strengthening and loading program of the Wujiang River Bridge (a two-span masonry arch
bridge with net span length of 100 m)in a county in Chongqing City was cited as an examnple and
the effectiveness of the smooth crest method was verified
Key words: arch bridge; masonry arch bridge; strengthening; loading; program optimizing
smoothing crest method; influential line of eccentric distance
1引言
建圬工拱桥,其承载状态与施工过程密切相关;对于
圬工拱桥,通常为超静定的无铰拱桥。对于新进行加固的圬工拱桥,其承载状态与加固、加(卸)载
收稿白期
甚金项目:重庆市教育委员会2013年科学技术研究项目基金支持项目(KJ130426)
ed by 2013 Sc
KJ130426)
作者简介:刘思孟,副教授,3-maill:simengliu④163.com。研究方向:桥梁和结构检测、评定、加固与在线监测。