Increase The Use Of Flat Hinge Theory Arch Bridge Strengthened Research

Arch bridge is one of the most important bridge-types in our country,especially in the Midwest which has many mountains and rivers,and is rich in stone and labour.So these regions built many arch bridge,most of which were masonry bridges.Because of the growth of traffic volume,traffic density and vehicle load,low of design load,aging,insufficient capacity,and so on,many old bridges have various problems,and some of them couldn't meet the demands.Therefore,how to maintain and reinforce these old bridges quickly and effectively becomes one important job.At home and abroad,the external factors from the bridge structure and the changes of internal condition are the main reinforcement methods that reinforces bridges to improve carrying capacity.Basing on the theory of no hinge arch and two hinge arch,flat hinge theory is brought out.Flat hinge theory using internal condition adopts special technology which makes no hinge arch into flat hinge arch in the arch feet parts.It changes the stress state of structure to redistribute internal stress, exploit the main arch's potential to make stress structure optimization,and improve the arch bridge.This paper focuses on discussing the proposed of flat hinge theory and its theoretical system.Then using the theory leads to the concrete method of reinforcement arch bridge-release energy method.The paper elaborate the principle ,theoretical calculation, model tests, construction mode of the method.Finally, by hand calculation and real bridge reinforcement example,it proves that the release energy method of flat hinge theory is efficient,convenient and economic which is realistic, practical and effective technique of arch bridge reinforcement.