Analysis On The Widening Of Hollow Slab Beam Bridges And The Characteristic Parameters Of Longitudinal Loints

The widening of the hollow plate beam bridge occupies a large proportion in the widening and reconstruction project of the bridge.Due to the differences between the old and the new bridge structure stiffness,resulting in deformation of the combined parts of the old and new bridges and relative deformation of new and old bridges are great different,it is easy to cause the development of the crack of the bridge deck pavement and the connecting position,which influences driving comfort,so it is necessary to study the connecting position between the new and old bridges of hollow plate beam.Based on the experience and development of bridge widening at home and abroad,this paper summarizes the structural form of hollow slab beam bridges,the principle of widening and connection mode,Beam Grid Method and the calculation of transverse load distribution.The main contents of this paper are as follows:(1)To study the bridge broadening of assembly simply supported hollow plate beam,analysis of deflection and load lateral distribution of old bridge by the impact after the hollow plate beam bridge broaden.(2)Using finite element method,the bridge calculation model before and after widening is set up,draw the load lateral distribution,to prove the rationality of the experiment within the allowable error range,and the computational model is applied to the back of the parameter analysis.(3)On the basis of finite element,using parameter analysis method to discuss the widened bridge longitudinal joint force and the impact on mid span load transverse distribution when the longitudinal joint polymer concrete height,width and the modulus of elasticity changes.(4)To analyze the impact on transverse force of longitudinal joint of new bridge settlement after widening,and put forward the requirement of settlement control.