预应力变截面混凝土连续箱梁桥承载力评定与分析

EVALUATION AND ANALYSIS OF BEARING CAPACITY OF PRESTRESSED VARIABLE SECTION CONCRETE CONTINUOUS BOX GIRDER BRIDGE

为综合评定大型桥梁的维修加固效果,有必要维修加固后的桥梁,开展承载力测试和评定工作。以预应力混凝土变截面连续箱梁的维修加固项目为依托,在对维修加固后桥梁外观检查的基础上,提出采用静载试验、模态试验、动载试验对桥梁主跨结构的承载力进行测试和分析。测试结果表明,在多种荷载工况作用下,桥梁结构处于弹性工作状态,主跨结构的刚度、强度、偏载系数、冲击系数等均满足正常使用要求。

In order to comprehensively evaluate the maintenance and reinforcement effect of large bridges,it is necessary to test and evaluate the bearing capacity of the repaired and strengthened bridges.Based on the maintenance and reinforcement project of prestressed concrete variable section continuous box girder,on the base of the appearance inspection of the bridge after maintenance and reinforcement,it was proposed to test and analyze the bearing capacity of the main span structure of the bridge by static load test,modal test and dynamic load test.The test results show that under various load conditions,the structure is in elastic working state,and the stiffness,strength,eccentric load coefficient and impact coefficient of the main span structure meet the requirements of normal use.