Study On The Design Of Simple-supported Continuous Girder And The Improvement Of The Joint Structure

With people's improvement that the comfortableness , security required to driving a vehicle with the development of expressway, the research for tradition simple-supported beam bridge runway how continuous cause the extensive attention. The joint of continuous slab-deck bridge adopted extensively at present is one kind of simple-supported beam bridge; it has the positive action of solving the problems of too many expansion joints which is easy to destroy and driving a vehicle uncomfortable on simple-supported beam bridges. With the bridge (especially the expressway bridge) using load increasing constantly (overload), volume of traffic increasing continuously, the defect on designing continuous slab-decks structure and the quality under the construction, the position of the expansion joints (joint of continuous slab-deck) is fractured , broken , destroyed seriously, and it affects the driving a vehicle comfortableness and security. It is essential and imperative to strengthen the research for the continuity of simple-supported beam bridges runway.The simple-supported continuous beam bridges include the form of "simple-supported after structure system continuity". This text main researches for the designing and calculation of "simple-supported after structure system continuity", the application and improvement measures of continuous slab-deck structure.As to the structure form of "simple-supported after structure system continuity", the text main introduces the methods of design and calculation about transforming from simple-supported structure to T shaped beam bridge, have and explains the basic calculation principle of T shaped curved component and its appliance for in bridge design and calculation. Practice indicates that this bridge type is a kind of more ideal bridge type. The execution and removing of temporary brace is an important link of constructional "simple-supported after structure system continuity" bridge. The design instances a 30m T shaped beam and it main introduces the pivotal working procedure——the execution of temporary brace and the arts and crafts of system transformation.As to the structure form of "simple-supported continuous slab-deck bridge", the text main proves the effective method to improve the circs of pressing strength. By the means of sticking GFRP sheet, it is greater than the fiber concrete and oxygen concrete continuous slab-deck construct no matter it produces the tired and invalid number of times of circulation that it is the initial crackle, and it has the advantages of convenient working, low influence by the season factor, no increasing project cost and prevent the crack of waterproof layer from expanding to the concrete layer, and so on. Therefore, it is a kind of more perfect improvement measures in continuous slab-deck structure.