某预应力混凝土梁桥的安全评定

某三跨预应力混凝土箱梁桥通车3个月后出现细微裂缝，采用无损检测技术与荷载试验法综合评定该梁桥技术状况。结构检测内容包括桥梁线形、混凝土强度、混凝土密实度、裂缝深度，进行了静荷载和动荷载试验。综合检测表明大桥承载力满足设计要求，但裂缝可能影响结构耐久性，因此，跨中裂缝必须封闭，并提出了相应的技术措施。

Safety Assessment of a Certain Pre-stressed Concrete Bridge

Minor cracks were found in a three-spanned box girder bridge after it was open to traffic for three months.In order to evaluate the technical conditions of the bridge,both the non-destruction test and the load trial test were performed for it.The test results show that the bearing capacity can satisfy the design requirement and the durability of the structure may be influenced greatly by the cracks.Effective measures are proposed for the purpose of closing the cracks in the spans.