Applied Mechanics and Materials Vols. 166-169

Abstract: In allusion to the safety problems of the shippment structure of hull subsection at area B in a Shipyard Co., Ltd., Guangdong, in this paper, a solid model for a proposed shippment structure of hull subsection was established by using a finite element software ANSYS which is a common software, the internal force (stress), deformation and stability of components under various actual working conditions were calculated, and then the checks of strength, stiffness and stability were performed on the basis of the national regulations. The results show that both strength and stability can meet the safety requirements of operation, but stiffness is insufficient, because the horizontal displacement of steel pillars in shippment structure oversteps the specified value of the national standards of China. The conclusion provides a theoretical foundation for the safety use of shippment structure of hull subsection and the optimization and improvement of the structure.

Abstract: Static load tests were conducted on two reversed-loading simply supported and two continuous outer-plated steel-concrete composite beams to study the formation and development of cracks in such beams under negative bending moment. The test results show that based on the plane section assumption, it is an effective and economical method to calculate the cracking moment of the composite beams assuming a rectangular stress block for concrete in tension zone. Considering the structural features of outer-plated steel-concrete composite beams, the formula for calculating crack width of concrete flange of outer-plated steel-concrete composite beams is discussed and presented, and the calculated values of crack width agree well with the experimental results.

Abstract: In order to use the construction generated soil to replace high quality sand for consolidation pile filling partially. Soil specimens with different plasticity indexes were prepared. Undrained triaxial compression tests were carried out on the samples for studying the strength property. Experiments show that the prepared soil specimens are satisfied for the condition of internal friction angle bigger than 30° in term of plasticity index smaller than 30.

Abstract: The purpose of this paper is to investigate the elastic local buckling strength and the behavior of tapered H-shaped beams under stress condition of cantilever beam. The analyses were conducted by separating H-shaped beam into two plate elements (web and flanges). From the results of analyses, authors evaluate elastic local buckling strength of each plate element, and clarify the several effects of tapered shape by comparing buckling strength and the behavior of tapered H-shaped beam with uniform H-shaped beam. In addition, authors examine coupled buckling of the two plate elements and confirm that the evaluations can be appropriate in case of coupled buckling.

Abstract: Based on the mechanical properties of steel cable under the high temperature test results, the mechanical properties, such as yield strength, modulus of elasticity of steel cable and its mechanics model were obtained. Nonlinear numerical analysis method was established based on the time integral effect. Through the analysis of the suspen-dome structure, this paper discusses the characteristics of temperature field distribution, displacement and stress. The results show that: suspen-dome structure has better spatial work performance; the weak area of the structure is at the central, the main reason of large deformation is the reduction of stiffness and strength.

Abstract: ΛεεThe explicit integral algorithms is not requiring iteration but needing a conditional stable, and the implicit integral algorithms is unconditionally stable but requiring iteration. In this paper, a modified Wilson θ method that named CD-Wilson θ method is established, the center difference method is used as explicit integral algorithms and Wilson θ method is used as implicit integral algorithms. And the amplification matrix is used to explore the stability and the precision according to calculation and deduction. The results show that conclusions of stability condition is θΩ_E≤2 , the problem of constrained time step of CD-Newmark is solved, and the value range of high precision and good stability is τ=6, ε =4 and 0<θ<0.6.

Abstract: This paper presents an investigation of ultimate strength of square CFT stub columns with slender sections. The definition of square CFT stub columns with slender sections is discussed and a new strength model is proposed. Experimental results of 31 axially loaded square CFT stub columns published in the literature are then used to verify the proposed strength model. Results show that the proposed strength model provides a direct, compact, and efficient representation of the ultimate strength of square CFT stub columns with slender sections.

Abstract: Some concepts related to slope monitoring warning are profoundly expounded including monitoring, prediction, forewarning and relationship between each other. Warning elements are deeply analyzed and warning system of safety monitoring is built. Then the general frame of safety monitoring warning is designed based on 3D framework theory and the practical need of warning. On the base of contents and process of monitoring warning, its work flow is proposed which provides overall concept and frame for the development of monitoring warning.

Abstract: Reinforced concrete (RC) column component is a very important lateral force-resisting member which is widely used in China. Its seismic behavior has a great impact on the seismic performance of the overall structure. Damage of some reinforced concrete frame structures under the earthquake is caused by the damage of columns, So RC columns are an essential seismic members. The paper introduces the design of RC column specimen, mechanical properties of materials, production of RC column specimen, test method, loading device, loading system, the contents of measurement and data acquisition in detail. From the above analysis, it is obvious that the test is the most effective means of studying the seismic performance of column.

Abstract: By using finite element analysis software ABAQUS, the mechanical behavior of the beam-column joints is studied through analyzing 8 interior beam-column joints in RC frame. Meanwhile, the factors which can have effects on the behavior of the beam-column joints are also obtained. The reasonable parameters such as material constitutive, the boundary conditions and mesh types will directly affect the accuracy of finite element analysis results. The mechanical behavior of the beam-column joint in RC frame is decided by concrete strength and volumetric percentage of stirrups. With the increase of concrete strength and volumetric percentage of stirrups in joint core, the shear capacity of interior beam-column joints in RC frame is improved.