Numerical Simulation Of Deck Repairing In The Simply Supported Bridge With Continuous Deck

The big tensile stress caused by negative bending moment will get the concrete in the continuous deck simply supported bridge crack. There were two commonly used ways for repairing the cracked deck :one is transforming simply supported bridge to simply supported-continuous bridge and the other is replacing the cracked concrete with repairing material. There is still another seldom used way in which the bridge is transformed to continuous bridge without adding prestress and without support conversion.From a real project of rehabilitating a two spanned continuous deck simply supported T-beamed bridge, the study of several different repairing scheme was carried out in detail through numerical simulation and several useful results were obtained. The paper's main works include:(1)Four repairing methods were studied in detail, which included steel fiber concrete project,steel fiber concrete + carbon fabric project,epoxy concrete and epoxy concrete + carbon project. All these researches were carried out in the software ANSYS, so the fundamental theory of finite element method was mentioned and especially the detailed introduction of SOLID65 element was presented. The most detrimental place for the concentrated lane loading was calculated with the help of extremum principle. The coupled effect between lane loading case and temperature case was analyzed, which could be referred as P ?Δeffect.( 2) The numerical simulation shows that the temperature case is more detrimental for the cracking of deck than the lane loading case. Because the depth of the repairing material is very small and it can't provide the enough rigidity to resist the incorporate displacement caused by applied loads, the big relative displacement of both sides will lead to the crack of the concrete above despite of the stiff repairing method with steel fiber concrete and the soft repairing method with epoxy concrete whether adding carbon fabric or not. The numerical simulation of the four different repairing technique shows there needs a better repairing technique.(3) Transforming the simply-supported beam bridge which needed repairing to be continuous beam without adding prestress and without support conversion was tested to be effective in the load case, yet not working well in the temperature case. So it is not an advisable method in repairing deck.