关键词: 桥梁工程, 先张预应力混凝土板梁, 梁端横裂, 梁端局部纵筋, 黏钢板加固

Abstract: The theoretical calculation and reinforcement test of the beam transverse crack of the pre-tensioning prestressed concrete slab beam were carried out，and the causes of the transverse crack at the beam end were analyzed.The pre-tensioning prestressed steel strand was self-anchored by batching concrete，which caused the local micro-cracks of concrete in the anchorage zone.During the operation，the diseases such as the beam bearing cavity and the hinge joints damage appeared，and caused the expansion of local micro-cracks and the transverse crack at the beam end under the action of overloading of live load.In the light of the beam transverse crack disease，adding local longitudinal reinforcement at the end of pre-tensioning beam during beam replacement or new construction was studied，and the control of micro-cracks in the structure and the shear bearing capacity of the beam end were obviously improved after the improvement.Aiming at the pre-tensioning prestressed concrete slab beam with transverse crack at the beam end during the operation，a single beam under replacement was used to carry out the theoretical analysis and load test of bonding steel plate reinforcement.In the case that the length of anchorage was satisfied，bonding steel plate reinforcement can deal with the transverse crack of the beam end better.

Key words: bridge engineering, pre-tensioning prestressed concrete slab beam, beam transverse crack, layout of the local longitudinal reinforcement, bonding steel plate reinforcement