摘要
为了解装配式小箱梁桥荷载横向分布特性,需讨论横向分布系数的计算方法及其适用范围。数值分析采用空间有限元法对由3～9片主梁组成的小箱梁桥的荷载横向分布系数进行了研究,并与常见的3种近似计算方法:刚接板梁法、刚性横梁法、G-M法的理论结果进行了比较。研究表明,在3～5片梁时,推荐使用刚性横梁法进行横向分布系数计算;在5～9片梁时,推荐使用G-M法进行横向分布系数计算。桥梁现场试验分别采用重物加载和汽车加载2种方式,分别研究带铺装和不带铺装2种条件下小箱梁桥的横向影响线和荷载横向分布系数,并与理论结果进行了比较。实测结果表明,现浇湿接段的施工质量对横向分布系数有一定的影响,但其误差在可接受的范围内。铺装层能对横向分布系数产生一定的影响,使桥梁横向受力更为均匀。
In order to determine the characteristic of lateral load distribution of fabricated small box girder bridge, the computational method and applicable range of lateral load distribution factor are necessary to be discussed. The lateral load distribution factor of small box girder bridge composed of 3 - 9 girders were studied with spatial FEA method, the results were compared with those from three classical appoximate theoretical methods including rigid-jointed slab （beam） method, rigid diaphragm method and G-M method. It shows that the rigid diaphragm method is applicable to the bridge composed of 3 -5 girders, while the G-M method is applicable to the bridge composed of 5 -9 girders. The lateral influence lines and load distribution factors with and without deck pavement were studied experimentally by means of weight loading and vehicle loading respectively, the results were compared with theoretical ones. The results from an in-situ experiment show that （ 1 ） the construction quality of the in-situ casted segment has certain impact on the lateral load distribution factor, however, the corresponding error falls in an acceptable range; （2） the pavement also has certain influence on the later load distribution factor, which leads to a more evenly distribution of lateral load.
出处
《公路交通科技》
CAS
CSCD
北大核心
2012年第1期86-90,共5页
Journal of Highway and Transportation Research and Development
关键词
桥梁工程
小箱梁
有限元法
荷载横向分布系数
影响线
荷载试验
bridge engineering
small box girder
FEM
lateral load distribution factor
influence line
load test
