Applied Mechanics and Materials Vols. 405-408

Abstract: Through the physical model test research on the dynamic response of jacket structure during floating transportation, the state of motion and the cable towing force under different wave conditions are given. The study results not only the scientific basis for the jacket structure construction, but also can be regarded as the relevant technical reserves of the jacket structure for deep-water offshore wharf construction in our country.

Abstract: This paper analyzes the mechanical behaviors and the principal of structural destroy when the openings are located in bending shear sections. Comparison of Some simplified design methods is also presented. A more rational simplified design method of the shear reinforcement in the RC beams with openings is advanced. Besides, the construction measures are suggested about upper and lower-chord around openings.

Abstract: This study presents the effect of slenderness ratio on inelastic buckling behavior and residual strength of H-section steel column member under axial compression loading. Both end pinned H-section steel column constraining rotation on the weak and strong axis was studied. When column members subjected to unexpected compression load (other than design load) will buckle if the applied load exceeds the critical load that induces buckling. To evaluate the effect of slenderness ratio and the influence of constraining rotation in different axis on the structural behavior of H-section steel column member, explicit nonlinear FEM analysis were carried out with reasonable accuracy. To verify the nonlinear finite element analysis, compression test was conducted and both inelastic deformation and the relationship between load-displacement curves were compared. The cumulative energy curve calculated from the load-displacement relationship curve has also been compared and satisfactory result was obtained. From the analysis result the part total energy (the total energy absorbed by the flanges and web) for the two constrain conditions was presented. Furthermore, based on the deflection theory, the relationship between load and displacement was also proposed.

Abstract: The underpinning plate is the main load-bearing structure in the integral jacking-up process of ancient building. The deformation and mechanical properties of the underpinning plate have impact on the stability and the safety of the whole integral jacking-up process. The deformation and mechanical properties of the underpinning plate in the loading stage and after the partial unloading stage are analyzed with ANSYS in the integral jacking-up process of a certain ancient building. It is shown that the deflection of the prestressed underpinning beam satisfies the requirement of the design code in the loading stage and after the partial unloading stage, the concrete at the bottom of the underpinning edge beam will not crack in the loading stage and the concrete at the bottom of the underpinning edge beam will crack after the partial unloading stage.

Abstract: Reliability and sensitivity of double-layer spherical lattice shells are extensively investigated, moreover the effect of different types of random variables and different positions of random variables on reliability and sensitivity are also studied in detail. External loads, cross-sectional area and yield strength of members are defined as random variables respectively according to their types and layouts in the lattice shells, and their effects on sensitivity are substantially calculated. Effect of random variables on several performance functions is also studied. Finally, correlations among these performance functions are calculated.

Abstract: The structure design of the tension cable in monolayer cable net curtain wall is very important. Generally the diameter and initial pre-tension of the tension cable is identified via iterative computing in the past works. This paper proposes a simple computing method for this case, which not only quickly computes the maximal internal force of the tension cable by the known deflection limit and identify the diameter of the tension cable, but also deduces the initial pre-tension of the tension cable and assist engineers to analyze and calibrate the tension cable and guide field tension construction.

Abstract: The elastic structure of the anchor-fixed monolayer cable net generates elastic displacement under pre-tension, so the designed tension of the cable can be consistent after repeated test and it is difficult to control in later construction. For this case, we get causes for elastic displacement based on comprehensive analysis, simulate and analyze it by using displacement compensation tension method to compute all initial tensions once time and guarantee consistent designed tensions after elastic distortion of a cable. We make the construction sequence and record the force and tension of each cable after it is strained in place based on computed initial pre-tension in order to monitor if the distortion is reasonable in tension and guarantee in-place tension in construction once time without repetition.

Abstract: The high-rise building body structures protruding parts stiffness can happen easily wind shock severe vibration under wind loads, effect whip sheath. From the principle of coupled vibration, wind-excited response formula to deduce the protruding portion of the building, the preparation whip sheath effect coefficient condensed reference table for engineering.

Abstract: Light steel temporary building is commonly used in the construction site, with advantages on simple structure, repeat used and small deadweight. There are still not enough researches and relevant standards to conduct the design and construction of the buildings. In order to precede to theoretical study on integral structure of light steel temporary buildings a method which used to set up finite element analysis model about integral structure of light steel temporary buildings was proposed in this paper. The method is based on finite element analysis software, Ansys. Using this method a monolayer integral structure, a two-story integral structure and a trilaminar integral structure model were set up. Lateral displacement under design load of the integral structure was solved out by these finite element models.

Abstract: Composite beam takes full advantage of mechanical properties of brittle and ductile materials elements. The key point is to rely on the shear connectors ensure overall coordination of composite beam, so as to achieve the effect of flexural component. The crack in composite beam caused by brittle materials elements is not negligible. We obtained the slip of shear connectors with the second order precision under the conditions that there are cracks in the brittle material elements, and the ultimate moment is obtained too.