Model experiment of shear performance of beam-end prefabricated spliced box girder bridge
Aiming at the problem that the construction quality of prestressed concrete box girder bridge is difficult to guarantee,the construction method of beam-end prefabricated splicing is put forward.The beam-end anchoring segment is precisely prefabricated,and longitudinally spliced with the field-cast segments through shear keys,so as to avoid the long-term performance degradation caused by construction.As the key component of the spliced box girder bridge,the junction surface under the shearing force at the beam end is the most unfavorable,so this paper adopts the full scale model test and finite element calculation to study the shear performance of the new segmental spliced concrete box girder bridge.The results of test,finite element calculation and parameter analysis show that the finite element model can simulate the shear performance of segmental spliced box girder bridge under test load.The junction surface of box girder with shear key is the weakest part of the bridge.Under the action of test load,the main failure mode of the test model is the failure of the shear key that transfers the shear force between segments.The ultimate shear capacity of the bridge is proportional to the size of the shear keys and the number of the web shear keys and the roof shear keys,but has little relation-ship with the number of the bottom plate shear keys.
segmental spliced box girder bridgeshear keyshear performancemodel testfinite element analysis
万方数据
维普
