Highway Hollow Plate Analysis Of The Reasons For Cracking

With rapid development of china's highways construction, prestressed hollow plate across its span larger capacity, construct convenient, can be concentrated prefabricated in large quantities factory, and many other advantages to the bridge construction, especially in highways construction have been wider range of applications. At present, in Chongqing expressway, Span 16～30 m for large, medium-sized and small bridges used for the assembly of prestressed concrete hollow plate simple beam bridge. According to Chongqing Expressway bridge's conservation and investigation, found that the hollow plate bridge always have more diseases, the most prominent of which typical of the disease is hollow plate surface tension appeared more serious longitudinal cracks, some of which through the whole span.In this paper, according to concrete cracks theory, hollow slab design theory, bridges space theory and space-based finite element analysis of the hollow slab , study the conditions by force of the hollow plate, analysis the causes of longitudinal cracks in hollow plate girder bridge. First, from the practical space theory, study the horizontal distribution coefficient calculation methods of the hollow plate. Secondly, make structural calculation to the prestressed hollow plate girder bridge on YuHe, YuQian, ShangJie highway, analysis the design differences and the impact of that. Then, as an example, make the entities finite element analysis to the single beam and the whole plate of HuaYanShi bridge. Finally, from design, construction, and transported the use of comprehensive, analysis the reasons of the highway hollow plate longitudinal cracking, then give some proposals to design and construction for improvement.