Bridge Construction Process, The Fine Analysis And Experimental Research

Different construction process of suspension bridge can produce different tension caused by dead loads.With the increasing span lengths of suspension bridges and the using PC stiffening-girder, the ratio of main cable tension caused by dead loads to its bearing capacity is increasing while its safty factor is decreasing. Therefore , more accurately construction process analysis is necessary .Based on elastic theory of finite displacement, embarked from the Updated Lagrangian formulation's virtual work increment equation for the two-dimensional continuum, in the thesis a finite element equation which can be solved by the mixed method with moving coordinates is obtained by quoting basic assumption and interpolation functions of the beam elements with small displacement. Further a geometric non-linear finite element method for the structures composed of trusses and beams is established.Based on this method, saddle-cable jacking can be simulated by improving the saddle-cable element during the construction process. In this method, not only geometric non-linear, the offset of the saddle and the fact that the second dead load of bridge is supported by both the main cable and the stiffening-girder are taken into consideration, but also pay attention to the internal force changes of the PC stiffening-girder which is produced by the tension of the hanger rod in the construction stages. The result prove that the method is efficiency and accuracy.In addition, three classical geometric non-linear examples are investigated in order to inspect the program in the thesis. Furthermore, taking Beipan River bridge as example, the construction process are calculated precisely and load testing are made . The results show that the method is efficiency and accuracy, the program converges quickly and has practicability in engineering as well.