云南省六库怒江大桥加固设计方案研究  

Study on Reinforcement of Nujinag Bridge in Liuku Township of Yunnan Province

作　　者：李桓兴 杨春雷 谭晓琦 高洪波[2] 

机构地区：[1]云南省公路科学技术研究院,云南昆明650051 [2]中交第二公路勘察设计研究院有限公司,湖北武汉430052

出　　处：《公路工程》2013年第2期129-132,共4页Highway Engineering

摘　　要：在运营20多a后,某大跨径变截面连续梁桥主梁出现了较严重的裂缝及跨中下挠现象,影响桥梁的结构安全及正常使用。本文结合该桥的荷载试验结论以及原桥设计状况的复核计算,对主梁病害成因进行了深入分析,在此基础提出中跨张拉体外预应力加固和中跨跨中增设钢桁架两种加固方案,经加固效果、施工难易程度及经济性等方面的对比分析,推荐合理的加固方案。After 20-year operating, some relatively severe cracks appear on the main girder of a certain long-span variable cross-section continuous girder bridge and also midspan sag is emerged which both affect the structural safety and normal use of the bridge. This article analyzes the causes of the dam- ages in detail based on the loading test result and calibrating calculation of the original design and comes up with two reinforcement plans based on the analysis, which are： midspan externally prestressed rein- forcement and adding steel truss in the middle of the midspan. The article recommends appropriate rein- forcement measures based analysis and comparison on effect, economy and construction difficulty per- spectives.

关 键 词：连续梁 跨中下绕 体外预应力 加固设计 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]