Taking Tongtu Bridge for example, the finite element method is adopted to obtain the shear lag effect in different stages of construction and under secondary dead load, which will be a help to practical design.

In order to study the deformation rule of the CFRP_reinforcement of RC beams under secondary loads,a non_linear finite element program of Visual Basic on RC beam reinforcement with carbon fiber reinforced polymer under the second load is completed in this paper.

Analysis of dead load deflection of post-tensioned pre-stressed concrete simple-supported beam bridge;

Based upon understanding of BS5400 codes for loads some valuable contents to domestic bridge design are introduced from dead load,secondary permanent load,live load,combinatorial loads and other aspects,which has a certain reference value for transverse dynamic analysis of large-span bridge.

Namely, n 0=E s/ E c under live load and n 1=n 0(1+φ) under dead load are shown.

To investigate the mechanical properties of the Q345(16Mn)steel made in China,steady state tests were carried out by using computer controlled test machine,heating device and specially designed deformation measuring appliance,with the 152 steel specimens coming from 10 factories.