Research On The Temperature Effect Of Integral Abutment Bridge

With the development of country economy , traffic-volume,traffic speed and automobile weight are increasing . In our country, it is very serious that joints are destroyed.Not only jointless bridge can answer that question, but also it has much othermerit . For example jointless bridge can reduce expense of bridge maintenance andimpact to bridge. Jointless bridge improve environment of travelling crane andprolong bridge's life . Jointless bridge also save the cost. So jointless bridge will beabroad adopted in future. But the theory of jointless bridge is imperfect . The design and construction of jointless bridge are very limited . It is feasible for us to apply jointless bridges for middle and little span bridges,but the effect of temperature is innegligible.In order to apply and disseminate this style of bridge, it brooks no delay to carry out theoretical and experimental research systematically on the jointless bridge. Therefore, taking the jointless bridge(8+13+8m,10+13+10m,3×13m)as the object of study, this paper works out a series of significant research by ANSYS software combined with practical mechanical situation of the jointless bridge. So the reliable mechanical basis for engineering design and the more exact calculation method for the structure analysis of the jointless bridge are offered. Some creative works have been done as followed:This article introduces the historical development of jointless bridge and the present situation at home and abroad systemically , and describes some problems existed in the study of jointless bridge.It researchs on the theory of solving temperature field and thermal stress in concrete structure, and gives the concerned computing formula.After studying the bridge model in detail, considering the interaction of piles-soil, surround and bottom soil is discreated the into horizontal and vertical springs with a certain extend of rigidity. Use the system of beam—grid, which using a series of longitudinal and transversal Three-Dimensional beam elements(Beam 4) to simulate the section of the hollow slab bridge and abutment, so dose the pile. Then the simply space computing model of jointless bridge is built.Based on the simplified model in this discourse, under five temperature load conditions, using the finite element software-Ansys to analyse the bridge beam,abutment and pile, draw some important conclusions, which provide reliable basis for engineering design and theoretical research .Establish a space model—entirety abutment, piles, straps and filling soil interaction, analyse the condition of the stress distribution, and give some suggestions to control reflection crack.