| As a novel system of steel structure, the staggered truss system has been analyzed theoretically and applied into some projects internationally. However, no research has been done yet on how to estimate the internal forces considering the structure deformation and the ultimate capacity which is especially important when this kind of system is applied into high-rise buildings. In this thesis, it is the first time that both 3D analysis concerning material and geometric non-linear and test research have been carried on the staggered truss system. Supported by the Science and Technical Research Foundation of Ministry of Education (No. 99089), the National Natural Science Foundation (No. 50078021) and College Doctor Foundation of Ministry of Education (No. 2000053203), this thesis is aimed at offering convicting evidence for the coming 《Technical Specification for Steel structure of light-Weight Building Systems》 . Moreover, popularizing such system is expected.The following works have been fulfilled within this thesis: First of all, based on the general principle of virtual displacement of nonlinear continuum mechanics, the geometric and material stiffness matrices is presented, several examples show that both of them can give out accurate result. Secondly, some conclusions have been made through the comparison of several examples. Thirdly, a set of equations concerning the second-order effects is proposed to facilitate practical use. The advantage of this simplified design method is that the second-order effects can be simulated in a convenient way. Finally, test on the staggered truss system model is carried out the first time internationally, the results of which accord with that of theoretically analysis. It testified the assumption that the floor has infinite stiffness is feasible. Moreover, it is the floor that makes the two neighboring trusses work together, and the horizontal shear forces are transferred by the tension field within it.
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