上承式三肋混凝土拱桥的横向分布规律试验分析

通过大跨三肋拱桥的荷载试验实测结果与空间有限元计算结果的比较和分析发现，在正载情况下，实测三个拱肋的横向分布特性是对称的，但中肋的实测横向分布系数明显较理论值大；在偏载情况下，偏载一侧的拱肋实测横向分布系数也较计算值大，远离偏载一侧的拱肋横向分布系数明显较小，这些现象表明，三肋拱桥的实际横向联系和横向刚度较弱，实桥通过横向联系分配和传递横向荷载的能力较比理论值小。三肋拱桥设计和加固时应考虑这一现象的影响。

Experimental Analysis of the Lateral Distribution Law of the Concrete Three-Ribbed Arch Bridges

Comparing the measured results of load test and the calculation results of the model of the three- ribbed arch bridges, it is found that the measured lateral distribution characteristic of the three ribs is symmetri- cal, but the value of middle rib is obvious bigger than the calculation result under the condition of upright load. Under the partial load, the measured value of partial load side rib is also bigger than the others, and the rib＇s value far from the load side is obvious smaller than the others. These phenomena indicate the actual connecting property of the diaphragms is poorer than that in theory. These phenomena should be considered under the three- ribbed arch bridge design and strengthening.