The paper includes the following models for nonlinear structural analysis purpose: (1) uniaxial spring mode (or one-component model);(2) multi-axial spring model (MS model). Moment-curvature relation model considers distributed nonlinearity as well. By specifying the relation of moment and curvature at critical sections, it is not a discretized-section but similar to the uniaxial model in including no interaction among bending and axial tension/compression. This paper describes the models and presents the related formula.

The symbiosis theory is dated from the biogeochemical theory. From a symbiosis theory perspective, the development of Logistics Park bears some similarities. Accordingly, this article aims at researching on the basis of the symbiosis theory, analyzes the path feature, the path selection and other issues that occur in development processes of logistics parks. And then, this article obtains a conclusion that the ultimate development goal of logistics parks is forming a complete integration symbiosis model. At last, this article analyzes the stability of this model by logistic pattern, which will open up new thoughts and new methods for the development of logistics parks in China.

Analyze mechanical behavior of over-thick concrete filled steel tube ( over-thick CFST ) subjected to axial compression and revealed adhesive slip law of steel tube/concrete. Axial symmetry elasticity modeling of the concrete column which is constrained by over-thick steel tube and pushed out under axial compressive load is set up. The push-out test was carried out and axial displacements of concrete column and steel tube were measured. On the base of the test,the adhesive layer between the concrete and the steel tube is introduced and shearing stress-shearing strain curve is set up. The results show that the adhesive stress between steel tube and concrete is uniform along the height,and uniform slipping along the height exists.Therefore the adhesive stress between steel tube and concrete can be precisely measured by push-out test of over-Thick CFST subjected to axial compression. The following conclusions can be drown that axial symmetry elasticity modeling is correct for simulating push-out test of over-thick CFST. There is an adhesive thin player between steel tube and concrete, the slip can be equivalent to shearing deformation of the adhesive layer. The relation of shearing stress-shearing strain can be determined by the push-out test.

This article studied the drilling loading method for the tensile strength of irregular small-stone, designed the measuring devices, and addressed the measurement problems of irregular small-stone tensile strength. Based on static equilibrium theory, it analyzed the distribution rule of tensile stress in dangerous section, and established the mechanics model of drilling loading method. In considering the impact rules of characteristic destruction size and round-hole size on the hole-edge stress concentration, on this basis it established the theoretical formulas of measuring the tensile strength of brittle materials. It practically measured the failure load of small drilling bluestone, introduced the failure load into the theoretical measurement formula of brittle material tensile strength, and then obtained the tensile strength of stones, while it measured the tensile strength of non-porous strip specimen. The tensile strength of irregular stones measured by the drilling loading method is basically consistent with the tensile strength obtained from the tensile test of non-porous strip specimen, and therefore the drilling loading method is able to reasonably measure the tensile strength of small stones.

Materials exhibit different characteristics in different levels. Apparent behavior and properties of the material are based on actual measurements and they were studied by the traditional theorems and theories. The article studied a new method for material analysis--analysis of mechanics of disturbed materials based on theory of duality disturbance. For material in the any deformed state，a given material element can be treated as mixed state included RND( RND: Relatively Non-Disturbed) and RCD (RCD: Relatively Complete Disturbed). "Duality" state is made of references state of RND and RCD.[1-3] The apparent behavior of disturbing engineering materials use appropriate perturbation function to describe which connect with "duality".