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The cracking moment in negative moment area of the composite beam can solved by analyzing the strain difference between the steel beam and the concrete. The influence of shear slip between the steel beam and the concrete was considered to control cracks of the concrete more accurately. Verifying the feasibility of the approach which was put forward in the paper by comparing caculation results and experimental results. Introduction Steel-concrete Composite Structure gives full play to the material properties of steel stretching resistance and concrete compression strength. It has the following good features: high bearing capacity, high stiffness, good seismic performance and dynamic performance, small component cross section size and fast construction. When Continuous Composite Beams are used, disadvantage conditions occur like: Steel pressure to negative moment and tension to concrete flange plate,which leads to the cracks of the concrete slabs. With the cracks of the concrete slabs, composite beam stiffness will decrease, the stud and steel are easy to corrode and the durability of the bridge will reduce. Therefore, how to prevent concrete crack in the negative moment region and control the crack width of cracks become the key problems of bridge design of continuous composite beams. In the calculation of steel and concrete composite structure design, steel and concrete interface shear slip is usually ignored. Thus the conclusion interaction between each other is made. In fact, steel concrete interface shear slip belongs to the partly interaction. Based on the elastic theory, the shearing slip under the reverse concentrated loads of the steel concrete composite beams is analyzed in this paper. And the cracking moment of the negative bending regions is solved by differential strain. Compared with experimental data, the result that Negative bending moment the cracking moment can be solved by the strain difference of analysis of steel concrete composite structure shear slip is believable. Theoretical Differential strain calculation under simply supported composite beams reverse concentrated loads Equations. Calculation of internal force of section Composite sectional drawing under concentrated loads(fig.1)Cross section strain relationship(fig. 2)

Research of Cracking Moment in Negative Moment Area of the Steel-Concrete Continuous Beam