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                                                            ¡¡¡¡¹Ø¼ü´Ê£ºÔ¤Ó¦Á¦»ìÄýÍÁ  ÏäÁº  ±ä½ØÃæÁ¬ÐøÁº  MidasÇÅÁºÄ£ÐÍ

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                                                            Abstract

                                                            ¡¡¡¡The design is based on the requirements of the design task and "Highway Bridge Regulation". The design of the bridge is carried out in the eight-character ruler of "safety, pratically, economically and aeshetic" by comparing and choosing the best one. The first program is continous prestressed concrete grider bridge, the second one the beam combination of arch bridge,and the third one is the suspension bridge.Accdoding to the above principles and construction factors, the prestressed conous bridge is chosen to the ultimate.

                                                            ¡¡¡¡The continous prestressed concrete girder bridge is pided into three inters, £¨30m+50m+30m£©£¬ with the main span of 50m, and 30m-symmetry one. Prestressed concrete box grider is used as the main beam; the beam depth in the mid-span is 1.5m, while at the support bearing it is 2.8m.The sectional depth is changed in the form of parabolic.The net width of the deck is 7+2x1.5m,and the design load is for the highway-I.

                                                            ¡¡¡¡In the design, the bridge design software MIDAS is used to get the calculation model. By analyzing and computing the dead load, live load and internal force, the estimated value of the prestressed strand is got. Finally, checking calculation is carried out to the stress and deformation of the main beam. The results of the analysis and checking calculation show that the design calculation method is correct, and the internal force distribution is reasonable to the design task.

                                                            ¡¡¡¡Key words: prestressed concrete; box-girder; non-uniform continuous beam; MIDAS bridge model

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