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对一座30m跨径的预应力混凝土简支箱梁进行了足尺模型破坏性试验,根据试验结果对其受力过程、裂缝分布、延性性能等进行分析;用5种相关规范对箱梁抗弯极限承载力及正常使用极限状态下的变形、裂缝进行验算,以此评估规范中相应计算公式的适用性;最后编制程序对箱梁包括卸载过程在内的全过程受力性能进行了参数分析。结果表明:ACI 318M-05,CEB-FIP MC90规范基本能反映箱梁正常使用极限状态下的变形性能;GB 50010—2002,TB 10002.3—2005规范基本能反映预应力混凝土足尺模型箱梁的裂缝特性;预应力筋的配筋率、张拉系数及预应力度对箱梁的延性影响较为明显。
A full-scale model destructive test was conducted on a prestressed concrete box girder with a span of 30m. The stress-bearing process, fracture distribution and ductility were analyzed according to the test results. The ultimate bearing capacity of the box girder Force and the limit of normal use of the deformation, cracks check, in order to assess the applicability of the corresponding formula in the specification; Finally, the preparation process of the box girder, including unloading process, including the whole process of stress performance parameters were analyzed. The results show that the code of ACI 318M-05 and CEB-FIP MC90 can basically reflect the deformation performance under the condition of normal use limit of box girder. GB 50010-2002 and TB 10002.3-2005 can basically reflect the crack of box girder of full-scale model prestressed concrete The prestressing tendons’ reinforcement ratio, tensile coefficient and prestressing degree have obvious influence on the ductility of the box girder.