Advanced Materials Research Vols. 250-253

Abstract: In this paper，by transforming the fully characteristic curve of pump with eighty specific speed to be numeralization he obtained fehleranalyse error of discrete data were analyzed based on the pump similarity theory and the difference between certain assumed condition and real situation in numeralization process. Then the influence of the fehleranalyse error of numeralization method on the pressure boost caused by Pump-off water hammer was computed by a Pump-off water hammer calculation within an real engineering project. The reliability of numeric calculation method of fully characteristic curve of Pump is proved.

Abstract: The summary of building equipment life cycle cost of the meaning and detailed analysis of the life cycle cost of building equipment, and the establishment of the life cycle cost of building equipment, all the models. An engineering example life cycle cost of building equipment, the analysis shows that the whole life cycle cost method of building equipment and analysis of the scheme to reduce the cost of system, to enhance the system provided on the economy.

Abstract: The long-term performance of reinforced concrete beams externally strengthened with CFRP composite was evaluated in the present study. The load-carrying capacity and failure mechanism of the beams subjected to different durations in a corrosive environment were examined using four-point bending test. A total of five reinforced concrete beams externally strengthened with CFRP composite were exposed to wet/dry cycles in salt water for 0, 90, 240, and 360 days before tested to failure. The experimental results revealed that the midspan debonding was the dominant mode of failure. The debonding at the CFRP-concrete interface was detected after flexural cracks were developed in the concrete members. The characteristics of the load-deflection curves were relatively similar for all tested beams. The aggressive environment however had the detrimental effects on reducing the bond strength and fracture energy at the CFRP-concrete interface. Additionally, the mode of failure was altered from debonding failure in concrete substrate to failure in the interface epoxy when the beams were exposed to wet/dry cycles. The research findings provided the long-term effectiveness of the CFRP strengthening system in a corrosive environment.

Abstract: The current management situation of the diet low-cost materials inventory in the university is analyzed in this paper and two solutions are given: ABC inventory analysis method and inventory control strategies. The calculation method of the ABC inventory analysis method is introduced through the management data of the low-cost materials inventory in some university, and the different control strategies are also explained according to different raw materials in the inventory control strategies. The order place and the calculation method of order quantity are given under the condition of determining the demand and lead time, and under the condition of uncertain of the demand and lead time, that provide a theoretical basis for the inventory control management.

Abstract: On the basis of discussing the superiority of architectural model applied in urban planning and architectural design, the defect of traditional architectural model was analyzed, and the theory of rapid prototyping technology was introduced. Architectural model flowchart for urban planning and architectural design based on rapid prototyping technology was put forward. And the realization for the flowchart in computer was also drawn. With two architectural model examples being applied, it was shown that the model based on rapid prototyping technology has great advantages in urban planning and architectural design.

Abstract: The humidity issue is one of the essential factors regarding the indoor environment quality. Researchers attempt to control the moisture in different methods, and the quantity of the researches keeps rising, which indicates the importance of the moisture buffering effect. The moisture buffering effect is a kind of passive design method, which is considered as more sustainable, compared to mechanical and chemical solutions. Taiwan locates in subtropics. However, the local researches concerning the moisture buffering effect in Taiwan are relatively fewer than those countries, which have lower temperature and humidity climate conditions than Taiwan. In addition, the general dehumidifying methods used in Taiwan are more concentrated in mechanical or chemical dehumidifying solutions. Moreover, typical town house in Taiwan usually represents as a north-south or east-west long axis living system without opening at the opposite axis, which leads the closed spaces with less openings for ventilations in the typical Taiwan town house, and those closed spaces are the main areas where the moisture accumulates. Therefore, this study follows the JIS A1470-1:2008 standard testing the MBV(Moisture Buffering Value) of 4 plate building and interior materials (Paulownia wood, Plywood, Pinewood, and Moisture Buffering Tile) and 3 Granular building and interior materials (Bamboo Charcoal, Activated Charcoal, and Silica Gel), and proposed design strategies along with moisture buffering materials (Double Wall System and Raised Floor System for existing building, and Counter-Beam System and Vertical Ventilation Duct for new construction) to provide local examples or references to Architects and interior designers in Taiwan.

Abstract: This paper presents an experimental investigation on typical end-plate connection with reduced beam-to-end plate welding, connected to cruciform column (CCUB) section. The study aims to reduce the cost of fabrication and materials. Two tests were conducted to study the behavior of the proposed connections and evaluate the failure modes, moment resistance, initial stiffness and rotational capacity of the connections. The experimental results indicated that the failure mechanisms for the tested specimens begin with the end-plate yielding followed by bolt slippage that was limited to the tension region of the joint due to the tension forces exerted through the top bolt rows. The experimental results will then be used to validate the theoretical model for the T-stub idealization of the tension zone.

Abstract: As the thin-walled structure,the buckling of steel silos is very sensitive to the initial geometric imperfections. However, these imperfections are uncertain to the shape and amplitude, so the studies of the initial geometric imperfections have important practical significance. Over the years, the circumferential imperfections have been known to result in the most important influence on the buckling of steel silos, which is also the most common defect in practical engineering. Using the existing research results, this paper analyzes three different imperfection shape functions and compare to the result of experiment in order to identify a function for the finite element analysis.

Abstract: This paper presents the test results of an experimental study that investigates the durability of a new generation of Glass Fiber Reinforced Polymer (GFRP) bars. A total of 60 GFRP bars were embedded in concrete prisms and exposed to ten environmental conditions for 6 and 12 months. The environments included exposure to ordinary tap water, sea water, and alkaline solution at two temperatures (room and 50°C). The environments also included two typical field conditions of the Kingdom of Saudi Arabia (Gulf area and Riyadh area). The performance of the GFRP bars was evaluated by conducting tensile tests on the bars extracted out of the concrete specimens after exposure to the environmental conditions. After 12 months of exposure, the test results showed that the tap water at 50°C had the maximum effect on the tensile strength of the GFRP bars. The two field conditions did not show any harmful effect on the tensile properties of the bars after 12 months of exposure.

Abstract: This paper researches the effect of the interfacial transition zone (ITZ) on the migration behavior of cations under the Accelerated Lithium Migration Technique (ALMT). Cylindrical mortars with different aggregate volume fractions (V_f) and w/c=0.5 were used. The result shows that when V_f ≤ 20 %, the Li⁺ steady state migration coefficient (D_s) is influenced by the dilution and tortuosity effects of the aggregate. The combined effect of ITZ and percolation occurs at V_f = 30 %, and the effects increase with the increase in V_f. Based on the experimental and regression analysis results, when the assumed thickness of ITZ = 20 μm, the approximate D_s of ITZ and percolated ITZ are 46.4 and 52.6 times the matrix migration coefficient.