京沪高速大胜关桥钢桁梁段节段模型试验方法  

Section model test method for steel truss girder segment in the along Beijing-Shanghai

作　　者：叶梅新[1] 陈佳[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2009年第1期16-20,共5页Journal of Railway Science and Engineering

基　　金：铁道部科技开发计划项目(2004G016-B-1)

摘　　要：京沪高速大胜关桥主桥是一座三主桁六线铁路钢桁梁(拱)桥,跨度为(108+192+336+336+192+108)m。采用混凝土与钢正交异性板相结合的整体桥面,多横梁体系,钢正交异性板与下弦杆焊连在一起。这种结构形式国内首次使用,结构构造和受力状态都较复杂。为考察钢桁梁段桥面系的受力状态、设计理论和方法的正确性,设计制作一个大比例的6节间节段模型,对节段模型模拟实桥不同受力区段的试验方法进行研究。通过采用不同的支承方式,分别模拟实桥正、负弯矩区的受力状态;通过桥面加载辅以节点补载方式,解决了节段模型试验中"第一系统"受力不足的问题,使节段模型试验反映了实桥的受力状态。The Beijing- Shanghai high- speed Dashengguan Bridge is a steel truss girder （arch） bridge which has three pieces of main truss and six railway lines. The span of the bridge is （108 ＋ 192 ＋ 336 ＋ 336 ＋ 192 ＋ 108） m. The orthotropic deck was combined with concrete slab, and also welded together with bottom chord. The multi - transversal - beam floor system was adopted in it. This form of structure was complex and was used for the first time in our country. A large proportion 6 - segment model was designed not only to review the performance of the deck system in steel truss segment, but also to check the design theory and calculation method. The test method was studied for section model to simulate force condition of different segments of real bridge. The positive and negative moment segments of real bridge were simulated respectively by changing supports location of model. Compared to real situation, the first system force of model was not enough. So the method of deck loading with assistant node loading was taken to solve this problem and the results show that model test can reflect the performance of real bridge accurately.

关 键 词：整体桥面 节段模型 模拟方法 节点加载 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]