Experimental study on bearing capacity of steel-high-performance concrete composite bridge tower

bridge engineering;  Steel - high-performance concrete;  combined bridge towers;  stability;  model testing;  Bearing capacity

The axial bearing capacity test of the steel-high-performance concrete composite tower section was carried out to study the stress characteristics of the composite tower. Referring to the relevant codes and regulations, the bearing capacity of the combined bridge tower was calculated. The test and calculation results show that the presence of concrete in the composite bridge tower can avoid or delay the local instability of the tower wall, improve the bearing capacity of the structure, and have great advantages over the steel bridge tower. The bearing capacity obtained by the direct superposition method is 7.3% larger than the test value, and the bearing capacity obtained by the method in DBJ13-51-2003 is 25.3% larger than the test value, the former is easy to calculate, the latter can consider the interaction between the wall plate and the concrete, but neither method can be included in the influence of local buckling of the wall plate; The weld and base metal of the composite bridge tower should be equally strong, otherwise it will cause the destruction of the entire structure due to the failure of the weld.