- Span T-rigid Frame Pier Beam Consolidation At The Pilot Study

The Yiwan railway is the one whose geological structure is the most complex in our country railway lines up to the present. In order to adapt the steep canyon, a series of high-pier and long-span T shaped bridge were designed. The Ma shui-he bridge is a PC T shaped bridge with the longest span and highest pier of all the T shaped bridge along the line, and it is also a rare-seen in the world, with the span of 116+116m and the pier height of 108m. The hollow pier and the box girder connected as the space frame, and the stress status of the joint part between pier and girder is complicated, and it's the key part of the bridge. The following work was done to the joint part:1. According to the structure characteristic and mechanical behavior of Ma shui-he bridge, and also by considering the condition of the Test examination center, the 1:6 scale was chosen, the intercepting principle and intercepting rang of the model were determined according to the Saint-Venant Principle.2. Based on the similarity principles, the formula of geometric measurement, load, internal force, stress and etc. have been deduced, and also the allocation of normal reinforcing steel bar and precast steel bar, project of load-adding, the parameters and project of test have been confirmed.3. A test model with 1:6 scale of the joint part between the pier and the girder of the Ma shui-he bridge was designed and constructed, the tests and finite element analysis under 9 load cases were carried out, and the evaluation was made to the mechanical behavior of the joint part.The study results of this paper provide a basis for the design of the joint part of the Ma shui-he bridge and provide the technical resourse for the other similar bridge design in the future.