Applied Mechanics and Materials Vols. 166-169

Abstract: This paper select the appropriate calculation and analysis models and examples, using finite element analysis software ANSYS to compare and analyze the dynamic properties of three large space shear walls of different thickness. The result indicated: the effects of the large space shear wall structure to torsion with the increase of wall thickness.

Abstract: The latest developments in structural topological optimization have been integrated with CFD for the optimization of building structures considering wind loading. Wind loads on a building are numerically simulated in ANSYS CFX and then transferred to ANSYS Static to get the structural response of the building in wind. The bi-directional evolutionary structural optimization (BESO) algorithm has been applied to buildings for an automatic structural topological optimization considering wind loading. The proposed approach is demonstrated by examples of the optimum structural design of exterior bracing system of a high-rise building.

Abstract: The analysis process on four types of structure transfer storey of a high-rise business-living building is introduced. Based on the successful control of the capability of the whole structure, diverse parameters are compared including bearing-lode and economic parameters. Further analysis is made to the optimized structure transfer storey. Design suggestions are proposed about the structure transfer storey scheme selection finally.

Abstract: Based on the theoretical analysis and testing results, some key issues in design of outer-plated steel-concrete continuous composite beams are discussed. The influence of the form of steel beam upper flange on the behavior of composite beam is analyzed. The requirements about longitudinal reinforcement strength in the concrete flange of the negative moment region are given. It is suggested that the moment-shear interaction should be neglected when calculating the flexural capacity of outer-plated steel-concrete composite beams under negative bending moment. The behavior of longitudinal shear resistance at the interface between the concrete flange and web of composite beam is studied, and the related calculating formula is put forward based on the structural features of the composite beam.

Abstract: Through the test and observe the failure deformation in concrete test cube, the paper analyze the influence of concrete strength, concrete cover thickness, internal reinforcement cage(transverse reinforcement), reinforcement diameter on the inorganic material reinforcement adhesive property, providing theoretical basis for the code of Technical specification for post-anchoring used in concrete structure with inorganic anchoring material.

Abstract: Auxiliary pile group closed to foundation pit can improve the stiffness of soil mass and decrease foundation pit’s transformation effectively to guarantee foundation pit’s stability. Drucker-Prager model is used and matched with Mohr-Coulomb model’s circumcircle, which can solve the problems of uncertain viscoplasticity strain rate and discontinuous in cones vertex, compared with Mohr-Coulomb model. Also, numerical simulation software FLAC3D is applied to help analyze foundation pit’s horizontal displacement caused by auxiliary pile group, and sensitivity analysis is done about pile spacing and stiffness. The calculation results compared with monitoring data show that Drucker-Prager model is appropriate to simulate foundation pit. Stiffness of soil mass can be improved obviously by auxiliary pile group. Auxiliary pile group of CFG mainly reduce foundation pit’s upper horizontal displacement while bored piles mainly cut down deep layer’s horizontal displacement of soil mass. The results can provide references to both design and management of foundation pit.

Abstract: Abstract. After the finishing of piles, it was found that concrete defects at 63.0m-67.0m at the No.1 Bored pile in the North Channel Bridge of Hangzhou Bay Bridge B13 pier, which is at a diameter of 250cm with length of 96m. Aiming to successful treatment for this kind of defects, the present study proposed the pressurized concrete injection treatment techniques for superdeep defects in bored piles. In the paper, the experiment was carried out in comparing various mixed proportions of grouting, and the relationship analyzed between compressive strength and sound velocity for the treatment process. From these data an empirical equation between sound velocity and strength was determined, and the curve established. Following the superdeep pressurized injection of concrete treatment technique, the bored pile was successfully treated for the defects, ensuring the pile foundation achieving design criteria.

Abstract: Through the pullout test on dowel bar of different surface treatment modes and position deviation, the paper draws the conclusion that the plastic spraying treatment in different surface treatment modes can maximum meet the setting requirements of dowel bar, and the angular deviation of the dowel bar is the main reason for the cracking within the 50 centimeters of both sides of cement concrete pavement joint; Through the bending fatigue test, the paper evaluates the attenuation law of joint load transfer capacity under different horizontal installation error conditions(0°, 5°, 10° and 15°), and find that with the increase of dowel bar deviation angle, the initial joint load transfer capacity presents a rapid downward trend, and the performance of whole working period become worse and worse, when the angular deviation of dowel bar in the horizontal plane is not more than 5°, juncture load transfer capacity can still remain the medium level, which will not have too much influence on the working performance of dowel bar. Finally, the paper presents the looseness of dowel bar after 800,000 times of bending fatigue, and puts forward the control measures to avoid position deviation of dowel bar.

Abstract: Static tests were conducted on frame structure of light steel temporary buildings under wind load. The mechanical behavior and the deformation performance of the structure were investigated. A kind of new system of load distribution beams was applied, which imposed the horizontal loads to load points of columns and simulated the uniformly distributed wind load. The load-displacement curves and the strains of the columns were obtained. The performances of the light steel temporary building are summarized and discussed.

Abstract: Considering the nonlinear behaviors of semi-rigid connections, a new calculation model for the second order elastic-plastic analysis of plane steel structures is presented by replacing the general element with a new one, which has two rotational springs at its ends. Based on the theory of beam-to-column, the element’s rotation-displacement equations are revised, and the second order elastic-plastic rigidity matrix of this kind of structure is derived in this paper. And the second order elastic-plastic program of this kind of structure is worked out. Two steel frames are calculated with this program. The results of calculations show that this model is reliable and fit to the analysis of all plane steel structures.