Applied Mechanics and Materials Vols. 99-100

Abstract: the concrete prestress truss to detect has been built for 47 years,because of function transfo- rmation ,the load increases,it’s necessary to find out that how much load can the prestress truss bear. At the same time,the owner demands that the original structure can’t be desructed during the detection. Based on this,we detect the prestress truss’s bearing capacity by pasting Strain gages to control rods and detect stress, set crane hammer and batch to mesure the roof truss’s deflection,then build model and make finite element analysis ,so as to offer basis of reinforcement design to design organization .

Abstract: DLS measurements and TEM observations show that the size of the shells grows linearly with the inverse of the dielectric constant of the medium. From the results ,it can be found that two factors of charges and size of the cationic counter-ions can be used to regulate the size of the single-layer shells formed by {Mo₇₂Fe₃₀} in dilute solution.

Abstract: Considering the interaction of building-soil-tunnel, the grillage beams foundation frame building vertical crossed by Double-Line (DL) parallel shield tunnel was simulated by 3D MIDAS/GTS software. The results show that: after left-shield tunnel construction had done, during the passage of the right shield tunnelling, the differential settlement decreased gradually, settlement is slightly larger than the left when the right tunnel had ready crossed the building. Uneven settlement first increases, and then decreases gradually tends to zero. Lateral horizontal displacement changes little, and longitudinal horizontal displacement first increased and then decreases. The building’s maximum first principal stress exceeds the standard value, which may cause cracking. With the increase of L the distance from frame axis to the axis of the two tunnels, the first principal stress P1 and maximum shear strain MSmax tended to reduce in general. The maximum differential settlement between columns first increased and then decreased.

Abstract: Based on detailed consideration of the autonomic healing concept of microencapsulated healing agent, micro- bacteria induced calcite and shape memory alloys, our research team proposed a new self-healing technique coupled with of SMA and heat-melt adhesive. In this article, chemical stability and bonding strength with cementitious materials of EVA heat-melt adhesive were tested. Experimental results show that EVA heat-melt adhesive may contain the ability being used in self-healing techniques coupled with SMA.

Abstract: Experimental investigations using granular activated carbon (GAC) adsorption and then desorpted with microwave irradiation for toluene abatement are reported in this paper. The results indicated that the adsorption capacity of GAC for toluene was 198 mg (toluene) / g (GAC) at 303 K. Isotherm analysis of adsorption data obtained at 303 K showed that the adsorption pattern of toluene on GAC followed the Langmuir isotherm. The Langmuir constants Q0 and b were found to be 208.33 mg/g and 0.0023 m³/mg, respectively. At 313 K, the saturated GAC could achieve more than 90% regeneration efficiency in 40 minutes. In this investigation, the reasonable regeneration temperature and superficial gas velocity were 313 K and 0.073 m/s, respectively.

Abstract: Through experiments and numerical analysis of water permeability and mechanical properties of the ATPB drainage layer, this research finds out the regular influential patterns of void ratio on water permeability and mechanical properties of the ATPB drainage layer. Based on other constraints, if only the void ratio can be limited within a reasonable range when design the drainage layer, it can ensure a good performance of water permeability and mechanical stability of the drainage layer with stable asphalt gravels. Through tests and analysis of ATPB mechanical properties in different soaking conditions, this research finds out the solutions to the decreasing bearing capacity of the structure caused by the over-large void ratio.

Abstract: This thesis aims to create and develop an integrated operating system platform by using programming languages, which has comprehends virtual reality technology, database technology as well image animation, all these three newly-found technologies together, and is utilized into the constructive field of mass concrete temperature control management. Furthermore, this research implies a further study of the application of virtual reality in concrete dam construction endowed with all the following priorities, such as: man-made interactive function, effective operability and compatible interface, which can simulate and rehearse all types of constructive schemes visually as well as measures with a practicable intention to provide a certain scientifically theoretical method for the construction of mass concrete projects. Thus, this platform can furnish a dynamic model based on virtual reality and engineering animation for concrete dam designs, pouring and temperature controlling, even can lead the construction scheme into its fullest optimization for any concrete construction as harboring true aims to improve the production efficiency and reduce any risk on costs of the popularization in addition with its application of this new technology.

Abstract: The scale model of squat silo in large diameter was established with Particle Flow Code (PFC3D) in this paper. This scale model uses the centrifuge model test principle for reference and provides the field of gravity in the calculation of archetypal squat silo. When the silo filled with granules reaches static equilibrium state, record the static lateral pressure measurement values of its each column measured wall, followed by eccentric discharge simulation in different operating conditions, while monitoring the changes of Measured walls in five different directions during discharging granules, in order to analyze the influence of eccentric discharge on the lateral pressure of large diameter squat silos wall. Thus the following conclusion can be obtained: （1）Overpressure coefficient is close extensive between eccentric distance and far extensive between physical reference of storing material.（2）Under the same condition, the overpressure coefficient of same side wall will be minished with the increasing of discharge port.（3）For the same silo model, maximum pressure coefficient is related with eccentric distance, discharge port size and the position with the wall measured, and its value is greater than the calculated value of standard, because the overpressure coefficient calculation formula is only related with silo diameter and eccentric distance, and this is worth further discussion.

Abstract: Green concrete is a concrete that supports the content of CO2 emissions reductions by using waste industries as cement replacement. The waste industries that commonly can be used in green concrete mixture design are fly ash, blast furnace slag, silica fume, and rice husk ash. The present of supplementary cementitous material in green concrete mixture can increase both compressive strength and cement efficiency. The higher of cement efficiency, the higher compressive strength and the lower cement content will be. Densified Mixture Design Algorithm (DMDA) is a method that has been widely applied to concrete constructions in Taiwan. DMDA method can support the higher of cement efficiency in green concrete design. By using DMDA to create green concrete with supplementary cementitous material can increase the life of concrete and hence reduce life-cycle cost.

Abstract: As new building materials, plastic has light weigh, corrosion resistance, low thermal conductivity, thermal insulation, waterproof, energy-saving, molding convenient, high recycling characteristic, widely used in building materials. According to the research of improving its flame retardancy, strength, thermal insulation, waterproof properties, the application of plastic use in doors and windows, pipeline, building walls and roofs of buildings, etc. were reviewed, and the developing direction was discussed.