The force distribution function is assumed , the inertia moment of discrete of pieces construction beam in axis direction and the discrete deformation numerical value of the roll in axis direction are determined , the deformation is calculated by the variable moment of inertia with the method of digital repeated.

The rebuilding scheme fully considers the harmony of the whole bridge with the surrounding environment, meets the planned traffic function requirements and the relative technical standards, puts forward the design of the steel composite beam structure for the main bridge and the technical measures taken for the sunk shaft foundation treat.

Experimental research on the shearing resistance strength of oblique section of composite beam;

Experimental study on bending behavior of composite beams with invertible T-shaped prestressed precast beam;

Calculation of normal section crack resistance of prestressed concrete composite beams with U-shaped precast beam;

In order to find out the structural performance of reactive powder concrete, three unbonded prestressed composite beams were made.

Author presents the experimental results of the crack widths of 20 unbonded partial prestressed concrete composite beams with rectangular cross-sections.

Based on the existing experimental researching information, this paper makes a further analysis on the frontage cross-sectional mechanical properties of reinforced concrete and pre-stressed concrete composite beams, suggests the method of differentiating the over reinforcement limitation and a method for calculating its frontage cross-sectional bearing capacity.