The global mechanical behaviors of Sutong Bridge, China, the longest cable-stayed bridge in the world, are presented by
using measurements from field static load tests compared with numerical analysis in this paper. A total of 37 loading
cases with 64 test trucks, each being 300kN in weight, were conducted on 10 key sections to investigate the bridge
behavior. The level of loading is about 50-88% of the code-specified serviceability load. A three-dimensional finite-element
model is developed and calibrated to match the experiment data. The results show that, under the load test conditions, the incremental deflections, stresses as well as cable force of the structure are linearly proportional to the incremental loads. Moreover, the transverse shear lag effects of the steel box girder are significant and the longitudinal stress distributions in the slabs and diaphragms of the box girder are non-uniform. A good agreement is achieved between the experimental tests and the numerical simulations based on the nonlinear theories of long span bridges.
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