Wuhan-guangzhou Passenger Line 140m Steel Box Tied Arch Bridge Arch Foot Model Test

With a span of 140 meters, the TingSi Bridge is a steel box through tied-arch bridge of Wuhan-Guangzhou passenger dedicated line, which overpasses the Beijing-Zhuhai highway. Before the completion of this bridge, no such high-speed railway bridge had been built.The span of the bridge is large while the arch springer is the crucial part of the tied arch bridge.Therefore,in this paper, large-scale model tests of this bridge was made on the basis of analysis. The main works are as follows:1 .The scope of arch springer model tests and local analyses were defined according to the principles of Saint-Venant. Meanwhile, based on the three-dimentional finite element analysis of the whole bridge, three most unfavorable load cases of the analysis and model tests were determined, that is, a, the load case of main arch to subject to unfavorable axial force; b, the load case of main arch to subject to unfavorable in-plane bending moment(vertical); c, the load case of main arch to subject to unfavorable out-of-plane bending moment(cross direction).2. Local finite element analysis under the three most unfavorable load cases of the arch springer model was conducted. The results proved to be inosculate with the finite element computations of the arch springer of the true bridge.3. A reduced-scale model of 1:4 was made according to the theory of similarity,moreover, the anchorage and loading proposals of the model were researched and designed.4. After the model tests under the three most unfavorable cases, the results show: the outcomes of the finite element analyses of the arch springer tally well with those of the model tests. If the main arch and the tie beam are in perpendicular connection, the concentration of stress will be obvious, while in circular curve connection, the concentration of stress can be relieved. The stress level of the arch springer is low in general; the arch springer is stressing safety and reasonable designed.The results of this paper can service design of this bridge and provide references for other similar structures.