基于荷载试验的5跨连续刚构桥偏载增大系数研究

A Study on the Off-load Increase Coefficient of a 5-span Continuous Rigid Frame Bridge Based on Load Test

针对荷载试验理论计算时箱梁偏载系数取值问题展开研究,通过经验系数法、偏心压力法、修正偏心压力法等简化方法计算出相应的偏载系数,然后与实体有限元模型计算的结果进行对比,得出该单箱单室箱梁的偏载系数推荐取值为1.50;采用现场实测挠度值得出的偏载系数值和理论计算得出的偏载系数值进行对比,表明理论计算结果可靠;修正偏心压力法计算偏载系数在已有的计算方法中精度最高,与实测数据吻合性最好,计算偏载系数时,宜优先采用。

In view of the load test when the theoretical calculation of box girder issues research,value of partial load coefficient through the experience coefficient method,eccentric-pressed method and modified eccentric-pressed method,simplified method to calculate the corresponding partial load coefficient,and then compared the calculation result of finite element model and the real,it is concluded that the single box single chamber box girder of partial load coefficient recommended value of 1.50;The results show that the theoretical calculation results are reliable.The modified eccentric pressure method has the highest accuracy in calculating the partial load coefficient among the existing calculation methods and the best agreement with the measured data.When calculating the partial load coefficient,the preferred method should be adopted.