Disturbance On The Carrying Capacity Of The Existing Arch Bridge Arch Foot

As the continuously development of our country national economy, load-carrying capability of current bridges becomes one of the problems that both the engineering and the academic pay much attention to. Thus, to study strengthening method about the current bridges has deep signification of theory and practice in China. This paper is concentrated on the existing arch bridge's load-carrying capacity's changes which are caused by the moves of arch feet. The author takes Ma Jiagou bridge's reforming engineering as a background, and puts forward the method to the arch bridge whose feet move. The method can be used I analyzing the load-carrying capability. The contents of the article are as follows:1. It is feasible to use linear elastic theory when analyzing the stress of arch bridges under design loads. In order to get accurate results, the influence of nonlinearity must be considered when studying the load-carrying capacity of arch bridges.2. This article makes use of the large-scale finite element software ANSYS 8.1 to establish the bridge's space actual model, and imitates the reforming construction's digging and filling the soil behind the bridge stage. Two construction projects based on this model are compared in order that the better one can insure the construction safe and efficient. With the help of this model, we can describe that the stress varying regulation which is under the changing displacement of arch feet, can know that the arch feet cut is a controlling cut.3. The author uses the bridge appropriative finite element software to build the flat-link system finite element model. The computing gives the answer to the biggest arch feet's horizontal displacement which can be born by this bridge. This way provides the direction for the other construction. The bridge's load-carrying capabilities are both checked whenever it is in construction and after construction. We make a conclusion that the bridge is always in a safe and reliable situation.4. We can get three series of data from the space model calculating, the flat model calculating and the measure on the spot. Through comparing, both twomodels are reasonable and feasible.The method of space model connected with flat model has some reference value to other construction. It is a good way that the data from the model calculating connects the data from the measure on the spot to evaluate the load-carrying capability of the bridge. This way is in very high expansion value.