Advanced Materials Research Vols. 255-260

Abstract: In this paper, an efficient method is proposed to determine the value of the parameters for the Plastic Damage Model previously proposed by authors. With the proposed method the users can get the value of all the model parameters if only know the uniaxial tension strength, compression strength and elastic modulus of the concrete material. Finally, through several numerical simulations it is proved that the proposed method is effective and the constitutive model using the parameters which determined by the proposed method has the capability of simulating typical nonlinear performances of concrete material.

Abstract: Based on a curved failure mechanism, an upper bound solution of ultimate pullout capacity of strip plate anchor subjected to pore pressure is derived using the upper bound theorem of limit analysis in conjunction with Hoek-Brown failure criterion. The effect of water pressure which is assumed to be a work rate of external force is included in the upper bound analysis. By employing variational calculation to minimize the objective function, the upper solution of ultimate pullout capacity is obtained. In order to evaluate the validity of the method, the solutions in this paper are compared with the results using linear multiple blocks failure mechanism. The good agreement shows that the curved failure mechanism is an effective method for evaluating the upper solution of ultimate pullout capacity of strip plate anchor.

Abstract: By introducing the reduction coefficient of concrete strength and the equivalent restriction reduction coefficient,the non-uniform confinement force of square steel tube to its core concrete is turned to that of equivalent circular steel tube. Then the ultimate load calculation formula for the solid multibarrel tube-confined concrete short columns (CHS inner and SHS outer) is derived based on the Unified Strength Theory(UST),in which the double restriction effect and the decrease of longitudinal stress because of the hoop tensile tension are considered. The influence of intermediate principal stress on the ultimate load is studied and the failure mechanism is discussed. The applicability of the formulas is testified and the results show that the formulas have significance in exerting material potential.

Abstract: This document aims at the vital role of project manager in current engineering project,as well as the project manager's special position in construction process. Combined with the thoughts and experiences of many years’ construction practice, this paper expounds the responsibilities in project management, such as on-the-spot production, planning, quality, security, progress, civilized construction and the coordination of relationship these seven principles, it also makes the corresponding request.

Abstract: Gypsum board as the basis, combined with double-sided adhesive sponge and neutral silicone adhesive connection, this method using gypsum board as the primary fire to A-level, affordable. With high construction speed, short construction period, it can save money and meet the quality requirements and bring greater economic benefits to investors. Therefore, the gypsum board primary aluminum plate construction method paste will be introduced to more and more application.

Abstract: The eigenfunction expansion method is introduced into the numerical calculations of elastic plates. Based on the variational method, all the fundamental solutions of the governing equations are obtained directly. Using eigenfunction expansion method, various boundary conditions can be conveniently described by the combination of the eigenfunctions due to the completeness of the solution space. The coefficients of the combination are determined by the boundary conditions. In the numerical example, the stress concentration phenomena produced by the restriction of displacement conditions is discussed in detail.

Abstract: The tensile fireproof lining of tunnel test has been done in orthogonal method with a custom-made fast fluctuation thermostat type resistance furnace which the maximum temperature may arrive 1200 °C , the heater was put for heating by choosing the RABT curve, the test result was analyzed, the ratio of tensile strength loss is changed with the meter of the polypropylene textile fiber, the silica flour and the carbon fiber, there is a optimality proportion when the ratio of tensile strength loss is low.

Abstract: The numerical analysis method is applied to simulate the whole process of bending. Keeping the section dimensions and the types of loads constant in prestressed concrete hollow slab with mid-strength spiral-rib steel wire, span-depth ratio, reinforcement ratio, strength of concrete, strength of steel bar and stretching control stress are analyzed and compared. The influence of span-depth ratio, reinforcement ratio, strength of concrete, strength of steel bar, and stretching control stress on deflection-span ratio at failure of prestressed concrete hollow slab is discussed by numerical simulation.

Abstract: Based on the model tests and the results of theoretical research, considered elasto-plasticity of the soil and highly nonlinear behavior of contact with columns and soil, more reasonable numerical model on multi-element composite foundation of concrete column and lime column was built. By changing the design parameters (the diameter of concrete column, the diameter of lime column, the length of lime column, cushion thickness), efficiency factors of bearing capacity of multi-element composite foundation on concrete column and lime column were to play a more systematic study. Some conclusions were drawn in favor of engineering design and theoretical study of multi-element composite foundation of concrete column and lime column.

Abstract: The damage detection based on curvature mode was discussed in this paper, a three dimensional reinforced concrete simple beam model was established by finite element software, two models of before and after damage were compared also. The results showed that, before and after damage, the natural frequency, vibration modes and displacement modes had small difference, yet the curvature modes of model had great change in the location of damage.