Discussion on causes and prevention of concrete cracks in Bridges（1）
1.The main cause of crack in concrete structure
1.1 Cracks caused by load.Under the action of load, there are one-dimensional tensile stresses acting on the cross section of the members that bear tension or bending moment force in the reinforced concrete mechanism, and two-dimensional and three-dimensional principal tensile stresses acting on the members that bear shear force and torque in the reinforced concrete structure.Therefore, cracks perpendicular to the direction of the principal tensile stress are most likely to occur in these members.In general, cracks are found throughout the entire section in the direction of the width of the member.
1.2. Cracks caused by temperature changes.
1.3. Cracks caused by shrinkage changes.The main reason for this kind of crack is that the volume of concrete will be deformed in the process of plastic shrinkage and shrinkage, which leads to the crack.
1.4. Cracks caused by foundation deformation.The additional stress in the components will be caused by the uneven vertical settlement of the foundation and the difference of lateral horizontal displacement in the construction of bridge engineering.
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