Advanced Materials Research Vol. 905

Abstract: In this paper, in order to resolve contradiction that is between high workability and anti-segregation in fresh concrete, low early strength and poor carbonation resistance property of concrete and high volume fly ash addition, high performance water reducer is used to reduce yield stress in fresh concrete, mineral mixture and flocculating agent are used to adjust viscosity and measure of activation enhances early strength of this concrete.

Abstract: A complex electronics circuit placeholder is embedded in the carbon fiber laminate. The reduction of the material mechanical strength is assessed. The strain interaction between electronics and carbon fiber laminate is measured with digital image correlation based deformation scanner GOM ARAMIS 2M. A finite element analysis model is developed and validated. Based on FEA results the response model for prediction of the mechanical properties of laminate is introduced.

Abstract: Semiconductor strain gauges have good potential for embedded structural health monitoring (SHM) applications. Silicon mechanical and thermal properties are similar to glass fiber. In this paper the high cycle loading of specimens with embedded and surface mounted semiconductor strain gauges is conducted. The base material is glass fiber laminate. Two different matrixes are used: polyester and epoxy resins. Hygrothermal loading is introduced to weaken the sensor-matrix interface and to imitate real application conditions.

Abstract: This study aims to assess heat transfer analysis of RC columns and unstressed test by applying 500°C isotherm method, which is the strength deterioration estimation method of Eurocode, inorder to use it as basic data for fire engineering design. According to the heat transfer analysis and fire resistance experiment, it was decided an appropriate axial ratio of RC columns that have cross sections of 300 and 350 can be anticipated as 0.49 and 0.59.

Abstract: Repairing and strengthening the structures are gaining more attention from many researchers and structural engineers after the structures suffered damages from natural disasters. Tunnel form RC buildings which are not designed according to seismic code of practice are very vulnerable to ground motion when located to near field earthquake. This paper presents the method of repair and strengthening of 3-storey tunnel form building subjected to in-plane lateral cyclic loading. The building was strengthened using the combination method of steel angle, steel plate and Carbon Fiber Reinforce Polymer (CFRP) sheet. The results show that the lateral strength capacity is increase by 15.66%, ductility increase by 53.57% and equivalent viscous damping increase by 28.88% for the first cycle and 33.65% for the second cycle. However, the stiffness of the structure reduce by 56.6%. It can be concluded that this method can be adopted for the damage of tunnel form building system.

Abstract: The creep behaviors of silicate-grouted sandy soil were investigated. A series of haversine creep tests with three frequencies (0.01 Hz, 0.05 Hz, and 0.1 Hz) were carried out to evaluate the dynamic properties (complex modulus and phase angle) of materials at low stress level. The stress-strain relationship for the sinusoidal test was plotted as an elliptical hysteretic loop. The complex modulus |G*(ω)| and the phase angle δ were determined from the hysteretic loop at a given frequency ω. While the complex modulus |G*(ω)| of the tested material increased, the complex compliance |J*(ω)| and the phase angle δ decreased with frequency ω within the tested frequency range.

Abstract: The hybrid inverse method to estimate the optimal water flow rate and surface temperature on the hot surface of the steel roller shutter with water film cooling system subjected to a fire environment is presented in this paper. The results show that the effect of the down-flowing water film flow rate on the present estimates cannot be negligible. The water-film system combined with the steel roller shutter can effectively improve the heat resistance and the temperature of the shutter slat surface can be controlled to around 100 °C. The optimal water flow rate is 110 L/min for a typical 3m x 3m steel roller shutter with water film cooling system.

Abstract: Since the column members in buildings deal with both vertical and horizontal loads, appropriated amount of load should be estimated in order to evaluate the fire resistance performance of the columns under loaded condition. However, according to the ISO 834, the international standard for the evaluation of structural members, the fire resistance performance evaluation of column members is only based on the displacement and displacement rate under loaded condition in a standard fire. The purpose of this study is to suggest appropriate axial load ratios for the evaluation of fire resistance performance. The test conducted in this study produced appropriate axial load ratios for different slenderness ratios. They are expected to contribute to more accurate estimation of fire resistance performance and more efficient and cost-effective structural design.

Abstract: In this study, effects of ground media on buried pipes due to blast were observed. The material properties for ground media and pipes limited to linear, elastic, homogeneous and isotropic were used. Blast load parameters were determined using UFC (2008). Equation of motion was solved using time integration technique in ABAQUS. From the results, depth plays a prominent role in the response of underground pipes due to blast. Mitigation measures to reduce the impact of blast on buried pipes were suggested.

Abstract: Through analysis and research the present automobile passenger station planning examples, this paper summarizes design methods and design trends on master planning, architectural function space, architectural form and other aspects of modern automobile passenger station, With a view to have a positive significance on the future planning of automobile passenger station.