The Mechanic Mechanism Research Of The Covered Timber Arch Bridge By Model Experiment Study

The history of the bridge in China is long and the form is diversified. The timber arch bridge is one of the outstanding representatives and is an important civil engineering culture heritage。 It’s distributed mainly over Zhejiang and Fujian province. The timber arch bridge is intricately designed and have a basically sound structure. Due to the lack of research on the load transmission mechanism of the main arch, the protection and restoration measures to the timber arch bridge is blindness and even cause damage to the original structure. It’s obviously that the study on the mechanical mechanism of the timber arch is essential.On the basis of a large number of domestic literatures on covered timber bridges, the main contents of this paper can be generalized as follow:Firstly, based on the results of the loading test to the1:5scale model of Jingning Dongkeng Bridge, we analysis the load-transferring mechanism of the main arch and study the deflection and stress distribution under load.Followed is the breaking test under symmetrical load and non-symmetrical loading. Through the test we acquainted with the ultimate bearing capacity and failure mode of the timber arch bridge under different loads.Finally, compare the deflection, stress distribution and failure mode of the model that has the "frog leg" and the model that doesn’t have,we explore the function of the "frog leg".