Applied Mechanics and Materials Vols. 166-169

Abstract: Based on the tests of 5 steel reinforced high strength concrete (SRHSC) frame interior joint specimens, this paper discusses the mechanism of load transference in the joints. Shear effect of each part of the joints including concrete, steel web, band, flange frame and stirrup is analyzed. And then, the shear capacity equation of SRHSC frame joints is presented. Comparing the calculation results with the test results, it is indicated that the shear capacity equation proposed can correctly evaluate the ultimate shear strength for SRHSC joints.

Abstract: Experiment study and theoretical analysis show that when the interfacial bond property cannot guarantee the cooperative work of structural steel with concrete, SRHSHPC (steel reinforced high-strength and high-performance concrete) beam will generate in splitting failure of bending, resulting in SRHSHPC beam flexural capacity does not work. According to the experiments, and adopting existed theory and domestic as well as foreign codes for composite beam, the failure modes, and shear calculation of SRHSHPC beam are analyzed in this paper.

Abstract: Based on the theory of elastic stability of structure,the calculating formula for dynamic stability critical length of construction member being in lateral resonance under the axial dynamic load is derived in this paper. The influence of different parameters, such as end conditions; rod size; damp force and excitation frequency, natural frequency, rod material, on dynamic stability critical length of rod is analyzed. The paper puts forward some related measures for reducing vibration of rod, and may provide reference values for the design and analysis of engineering.

Abstract: Construction formwork concrete shear wall is one of new type of structural system. In order to study the shear resistant strength of construction formwork concrete shear wall, 21 quasi-static test results were collected, influence factors which affect the shear resistant strength of construction formwork concrete shear wall through grey-correlation analysis method were analyzed. It is found that, among the influence factors, axial compressive force is the most important, secondly is the effective height of the wall, the distance among stiffening ribs in the latitudinal direction show small influence. And the expressions to estimate the shear resistant strength of construction formwork concrete shear wall were proposed by regression analysis method.

Abstract: According to the force method of solving of statically indeterminate structure is requirements of the primary structure, the primary structure can be a statically determinate structure also be a statically indeterminate structure. The higher degrees statically indeterminate problems, broken down into multi-layer lower degrees statically indeterminate problems, successive to solve, so time after time using lower degrees or even one degree force method typical equation, the less the solution or do not need to solve simultaneous equations, and solving the higher degrees statically indeterminate structure. On this basis, it can easily statically indeterminate structure with other solution methods in combination, to improve operational efficiency.

Abstract: By experimental, study on the elastic modulus including the failure modes of Recycled Concrete made of Brick and Tile with the splitting tensile strength and the compressive strength, And the relational formula between the splitting tensile strength and the compressive strength was summarized from the results.

Abstract: A new transmission scheme based on expansion lever method was used. The transmission and transmission scheme of ZF6 AT were detailedly analyzed by using the explanded Lever method.

Abstract: A fine analysis model for joints in axial shear is given on the base of observation of experiment. Failure of the pin connecting adherends is due to combined deformation of pressure-shear. Both critical region of the pin and the stress state in critical rejoin are evaluated. Ultimate load Fu of the joint in axial shear is evaluated with strength criteria. The following conclusions are obtained. (1) Fu is related to ratio of adherend thickness t to length L. Fu increases with t when t/L is less than 0.1 and hold as a constant when t/L is greater than 0.2; (2) Fu can well be predicted by bi-shear theory or maximum tension strain criterion, but not by Tresca and Mises criteria; (3) Although traditional approximate calculation method of connections is widely used, related experiment must be done for obtaining ultimate shearing stress. Thus, the fine analysis method presented in this paper is useful for stress analysis and strength evaluation of connections.

Abstract: An approach to increasing the loading ability of adhesive joints by adding reinforced pins is presented. Following procedures are taken for making adhesive joints with reinforced pins: At first, holes are drilled at the overlap region of adherends, and then one hole is filled with a metal pin and adhesive. At the same time, adhesive is also applied on the surfaces of the overlap of adherends. After cured, the metal pin and the adhesive in one hole form an adhesive-metal reinforced pin. In this study, strengths of single-lap adhesive joints with the reinforced pins were measured experimentally. It is found that to well-bonded joints, (1) the strength of single-lap adhesive joints with adhesive-metal pins are obviously greater than those without adhesive-metal pins; (2) the strength of single-lap adhesive joints with adhesive-metal pins is highest when the pins are located at the positions of 5mm from the two ends of the overlap segment, the strength of single-lap adhesive joints with adhesive-metal pins is lowest when the pins are located at the middle of the overlap segment, about 10mm from the two ends of the overlap segment.

Abstract: This paper analyzes the results of experience and rules of distribution of the cold – formed residual stress. Distribution models of residual stress in cold-formed thin-wall steel that are close to the real condition and initial stress files of ANSYS which can describe the magnitude and distribution of the residual stress are established. This method can be applicable to simulate different distribution of the residual stress. Through importing the files into the stability analysis of ANSYS, ultimate load in the effect of residual stress can be gained. The stability coefficient of cold-formed thin-wall crimping angle steel under influence of the initial bending of 1/750 is studied, comparing the result curve with the one in GB50018-2002, it is proved that the curve is reasonable and the stability coefficient of the code should be suitable to improve.