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裂缝宽度控制的目的是保证结构的正常使用功能和结构耐久性能。在两榀预应力型钢混凝土框架竖向静力试验的基础上,对预应力型钢框架裂缝发生、开展和分布进行了详细的观测与分析。考虑次弯矩、次轴力的影响,基于现行混凝土规范的裂缝宽度计算原理,提出了全面考虑次内力的预应力型钢混凝土结构最大裂缝宽度计算公式,建议的计算公式概念明确,计算值与试验结果吻合较好,可作为在编国家行业标准《预应力混凝土结构设计规范》的参考。
The purpose of crack width control is to ensure the normal function of the structure and the durability of the structure. Based on the vertical static test of two 榀 prestressed steel concrete frames, the occurrence, development and distribution of cracks in prestressed steel frame are analyzed in detail. Considering the influence of secondary moment and secondary axial force, the calculation formula of the maximum crack width of prestressed steel reinforced concrete (CFST) structures with full consideration of secondary internal force is proposed based on the calculation principle of the crack width of the existing concrete code. The proposed formulas have clear concepts, calculated values and tests The result is in good agreement, which can be used as a reference in compiling the national industry standard “Prestressed Concrete Structure Design Code”.