| Steel-lightweight aggregate concrete composite structure is a kind of new structure after steel , concrete structure and steel–concrete composite structure. The engineering practice proving of recently, the structure has the advantages of steel structure, concrete structure and steel–concrete composite structure. Steel-lightweight aggregate concrete composite beam is a kind of modern beams that bases on the steel-lightweight aggregate concrete composite beams and induces to steel and reinforcement lightweight aggregate concrete slab composite and work together. Lightweight aggregate concrete has advantage of light weight, heat preservation function good, good endurance seepage and fire-proof function good. So it has been used more and more engineering. Lightweight aggregate concrete is main researching direction of improving concrete and composite structure. Anticipate lightweight aggregate concrete application in the combination is in the structure, therefore the work behaviors of composite structure component are better. The weight of component is lightened. The dimension of component is reduced. The structure form is reasonable and the technology target is advanced. The structure can be adequate to the development of large span, weight loads and tower modern project structure and the requirement of enduring to bad environment ,the work properties and design method. This composite beams would be well used in the future.The paper is a part of the project of"the research on the shear connector of composite steel-lightweight aggregate concrete beam"belonging to the Communications Department of Jilin province. The theory of lightweight aggregate concrete applying to the steel-concrete composite beam is much more than the simple elongation of the theory of the steel-common concrete composite beam, and it still needs further theory analysis. In order to acquire the optimum unification of the structural reliability and the economy of the steel-lightweight aggregate concrete composite beam, and it needs make each material develop each merit. The function of the steel-lightweight aggregate concrete composite beam lies on the composite level between the steel and the lightweight aggregate concrete, and that the composite level between the steel and the lightweight aggregate concrete mostly lies on the connective function of shear connector again. Therefore the research on the performances of kinds of shear connector of the steel-lightweight aggregate concrete beam is necessary, and its realistic meaning is significant. Based on this, non-linear analysis and optimum design are applied to the shear connector of the steel-lightweight aggregate concrete composite beam by means of the ANSYS software in this article. The paper consists of five chapters. Of these chapters, chapters two, three and four are kernels.Chapter 1 is the introduction, and it introduces the investigative actuality of the steel-lightweight aggregate concrete composite beam in home and overseas. Among them, the shear connector is the key of the steel-lightweight aggregate concrete composite beam to be subjected to the dint. The research on the performance of shear connector in the steel-lightweight aggregate concrete composite beam is infrequent in home. The aim of the text is to research into the seismic behaviors of shear connector in the steel-lightweight aggregate concrete beam and design the shear connector optimum, and some basic preparation has also been made to extend the research and the construction of the steel-lightweight aggregate concrete composite beam.The second chapter mainly introduces the modality and the sort of kinds of shear connectors , and the seismic behaviors of three kinds of shear connectors in steel-lightweight aggregate concrete composite beam are illustrated detailedly. Because of the low intensity of lightweight aggregate concrete itself, lightweight aggregate concrete slab is steamed roller earlier in steel-lightweight aggregate concrete composite beam and that the shear connector and I-bar are intact. It also analyses the interface slip of the composite beams on light aggregate concrete in theory.The third chapter is the important part and it chiefly introduces the methods to design shear connector in steel-lightweight aggregate concrete composite beam, and elastic design method is conservative excessively and people mostly use plastic design method to design composite beam shear connector presently. At one time, it illustrates the research for the shear capacity of shear connector and its calculation methods in detail. Finally, this chapter selects a calculational example in which the optimum design is applied to the shear connector of steel-lightweight aggregate concrete composite beam and the ultimate load-carrying capacity of the steel-light weight aggregate concrete composite beam is also calculated.Chapter 4 is the keystone and the core of this article. By using finite element method based on ANSYS, non-linear analysis was applied to analyzing the model of lightweight aggregate concrete composite beams. It analyzes the rules of the stress distribution of three different kinds of shear connectors, and it also analyzes the rules of the interface slip of the composite beams on lightweight aggregate concrete. This chapter importantly carries through the optimum design of the composite beams on lightweight aggregate concrete, and it points out that the changes of the intensity of shear connector and the degree modulus of shear connection impact the performances of lightweight aggregate concrete composite beam, and at the same time the shear connector is designed according to three kinds of array measurements. Based on the test data of basic behaviors of lightweight aggregate concrete, the ultimate bearing capacity of lightweight aggregate concrete composite beam under different array measurements of three kinds of shear connectors in the model of ANSYS software is presented, and then the result mentioned above is compared with the ultimate bearing capacity obtained from the calculational example in chapter 3. At last, the optimum design of shear connector of steel-lightweight aggregate concrete composite beam is also presented.Chapter five is the last part. And this chapter is summarization of this paper in which the content and direction are also pointed out for further study.
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