Research on the Mechanism and Countermeasures of Temperature Cracks in Large-Span Prestressed Concrete Continuous Beam Bridges

With the continuous improvement of construction quality and operation maintenance requirements for highway bridges in China, crack control during bridge construction has become particularly important. Significant temperature difference stress will be generated inside the bridge, leading to cracks. This article applies the principle of finite element analysis to analyze the temperature stress of the Wuhan Jingzhou Expressway Hanbei River No.2 Extra Large Bridge, and verifies that the temperature stress of the bridge meets the requirements of the specifications under the most unfavorable conditions. Further suggestions from the aspects of design and construction are proposed as follows: appropriately increase the net distance between pipelines and between pipelines and the lower edge, and prohibit the implementation of key construction pouring or key parts such as closure section construction when the temperature difference between day and night is large. This not only provides important guidance for the design and construction of large-span prestressed concrete continuous beam bridges, but also provides theoretical support and practical reference for crack prevention and control in similar bridge structures.