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

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.