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1 概述由于简支混凝土梁桥、板桥施工方便、快捷,各地有大量简支梁、板桥存在。目前一些设计荷载等级较低,服役年限较长的梁、板桥在大量超载车辆通行下,出现了各种病害如桥头跳车、混凝土开裂、钢筋锈蚀、单板受力等等,致使桥梁承载能力下降。所谓单板受力指桥面板铰缝混凝土脱落,主梁间横向联系破坏,使主梁承受的荷载不能有效传递给相邻主梁,导致桥梁横向分布降低,进而影响桥梁承载能力;当荷载超过主梁的极
1 Overview Due to simply supported concrete girder bridge, Banqiao easy and quick construction, there are a large number of simple support beams, Banqiao exist. At present, some beams with low load rating and long service life, such as beams and bridges, concrete cracks, corrosion of reinforcing steel bars, force of veneer and so on, cause the bridge to bear Decrease in ability. The so-called single-board force refers to the concrete deck slab joints fall off, the horizontal contact between the main beam destruction, so that the main beam load can not be effectively transmitted to the adjacent main beam, resulting in reduced horizontal distribution of the bridge, thereby affecting the carrying capacity of the bridge; when the load exceeds The main beam of the pole