Stress Analysis Of T-shaped Beam During The Procession Of Tensioning Tendons

Prefabricated prestressed concrete T-shaped beam bridge was one of the most popularpattern in the highway bridge currently for its many advantages, such as its up and lower partcan be done on the same time and the quality of the T-shaped beam can be easily assured. Therelation between sequence of tensioning tendons with tensioning effect of T-shaped beam isclosed. Improper sequence of tensioning tendons may cause high partial stress and the T-shaped beam may crack, so it is important to check the stress in this situation.Firstly, the domestic and international development and the research condition ofPrestressed concrete were generalized in this paper. The basic theories on the materialnonlinearity and boundary nonlinearity were analyzed, then the method adopted in the finiteelements method nonlinear analysis which contains the relation of the stress and the strain forthe material, hardening models, and the solution of nonlinear equations were introduced. Thenthe T-shaped beam experiment was introduced. It is difficult to calculate the stress of T-shapedbeam during the procession of tensioning tendons for the contact length between beam withabutment was hard to decide, usually suppose the T-shaped beam was simple-supported thencalculate similarly, try to calculate the stress accurately based on contact element of ANSYSprogram in this paper. Establish one finite element model of whole beam, tension the tendonsby three sequences. The relation between the stress on L/2, reversed, deflection, side bend ofthe T-shaped beam with the sequence of tensioning tendons was analyzed. Meanwhile calculatethe stress of T-shaped beam on the L/2 and L/4 according to the bridge code. The resultaccording to the bridge code,by ANSYS program and experiment are compared, the cause ofdifferentiation was analyzed. One finite element model of end beam was established, tensionthe tendons by three sequences, the stress distribution during the procession of tensioning thetendons was analyzed, the relation between the stress of concrete under the anchorage with thesequence of tensioning tendons was discussed.