Test And Research On Bearing Stress Of Tubular Joints Used In Concrete-Filled Steel Tube Arch Bridges

Presently, the concrete-filled steel tubular structure is applied widely in bridge engineering. All in all, the most important is to estimate the fatigue life of the joints on the concrete-filled steel tube arch bridges. However, there is not similar structure for reference now, and it's difficult to resolve in theory. The study object of this paper is the Wushan Yangtze Bridge that is in construction, and the purpose is to analyze the static behavior on the tubular DY-joints and validate the fatigue life on the tubular joints under the design load. The study method is to combine theory calculation with model test. In the part of theory calculation, utilize general FEM software ANSYS, calculate the tubular joints and concrete-filled steel tubular joints respectively, then summarize the hotspot location and the SCF of joints. The experimentation is separated into two parts, one is static-load test, and another is fatigue test. Based on the outcome of the static-load test, achieve the hotspot stress and the SCF, then compare the value that is calculated with the value from test, analyze the difference between them. The fatigue test is based on nominal stress range. At the last, analyzing and estimating the outcome, testified that fatigue intensity is not dominant in the process of designing the Wushan Yangtze Bridge.