According to the structure characteristics of L-B composite brake beam,the finite element model of L-B brake beam based on contact is established,and the stress distribution of the brake beam in different conditions calculated is using I-DEAS software.

The bad release of the composite brake beam in speed increased bogies for railway freight cars is analyzed through calculation and test.

Rational internal force of hangers under different construction stage can be obtained through optimization analysis of the object under the finished bridge condition of the camber composite bridge.

To study the mechanical behavior of continuous composite girder,the girders of Bainain River Bridge on Hefei-Anqing Expressway are taken as the research object,and a piece of I-shape composite girder is collected from the Bridge for loading tests and for studying of the static behavior and limited safety carrying capacity of the girder.

In the design and construction of latticed composite girder,the construction schedule is always delayed because of large quantity of welding for shear connectors and complex forming procedure for concrete bearing bracket.