| With the development of the Nation's Economic, the traffic amount increased rapidly. Considering the factors of design, construction and age etc., a lot of arch bridges have been damaged over the days, going so far as to influence their service, and need to be maintained or strengthened in time. Aiming at this situation, certain problems as following are studied combined with Nanbu Jialingjiang River Bridge in the thesis, which can be a reference for the later similar works.(1) For the obvious shortcoming of the traditional method to analyze the existing arch bridge, the finite element method (FEM) with the software ALGOR12 is used to establish the entire pre-reinforcement and post-reinforcement bridge space FE models respectively according to the character of existing bridge.(2) To determine the worst load case accurately and quickly, influence faces of main sections are plotted <>(3) Combining the influence face with the pre-reinforcement space FE model, the internal force and the stability are computed, then the main reasons of the disease are analyzed.(4) According to the analysis and the service demand, the paper introduces the strengthening scheme of Nanbu arch bridge and some new materials and new techniques applied considering the actual situation in site.(5) The internal force and the stability of the post-reinforcement condition are also calculated with the post-reinforcement space FE model. Furthermore, the feasibility of the strengthening scheme is discussed.(6) Based on the above work, valuable conclusions are obtained in the paper. FEM can simulate the actual situation of the existing bridges, and may be used into the internal force computation widely. The internal force analysis may provide the basis to choose the responsible strengthening scheme, which could be taken as reference by other existing construction. Also, the planting reinforce bar technique could be applied to the strengthening structures.
|
PDF Full Text Request