Advanced Materials Research Vols. 243-249

Abstract: According to the damage characteristics of pile-soil-structure interaction system subjected to the earthquake, the seismic design method of using the dual design guideline of strength and deformation and taking the same reliability for both pile foundation and superstructure was put forward. The stochastic dynamic reliability of pile-soil-structure interaction system with uncertain parameters was studied on the basis of the randomness of earthquake, the nonlinearity of soil material parameters, and especailly the variability of soil material parameters. The results show that the control indexes of pile foundation and superstructure decreases with the increases of failure probability and the variation of material parameters will make the pile foundation structure partial unsafe.

Abstract: The neutralization of fly ash concrete under loads subjected to the simultaneous attack of acid rain was investigated in this paper. And the influence of stress level and fly ash replacement on neutralization of fly ash concrete was analyzed. It was found that, the bending tensile stress accelerated the acid rain attack. The higher the stress level, the more serious the concrete corrosion. In contrast, the bending compressive stress slowed down the acid rain attack. The results also showed that the neutralization depth of fly ash concrete was increasing and concrete corrosion attacked by acid rain was more serious as the fly ash replacement increased.

Abstract: Demand for natural sand in concrete is increasing day by day since the available sand cannot meet the rising demand of construction sector. This paper reports the experimental study undertaken to investigate the influence of partial replacement of cement with Ground Granulated Blast Furnace Slag(GGBFS) in concrete containing quarry dust as fine aggregate. The cement was replaced by 10%, 20%, 30%, 40% and 50% of GGBFS and tests were conducted to determine the optimum level of replacement of GGBFS in quarry dust concrete. The specimens were subjected to compressive strength, split tensile strength, flexural strength, and bond strength tests at 7days, 28days, 56days, 90days and 150 days. The resistance to corrosion is evaluated based on the performance of the concrete for the penetration of chloride ions by means of impressed voltage technique in saline medium and Gravimetric weight loss method. Results herein reveal that an increase in slag proportion increases the strength properties and decreases the rate and amount of corrosion of reinforcement and among the various percentages of replacement 40% is found to be optimum with better strength and corrosion resistance properties.

Abstract: In order to research generalized apparent temperature model in Beijing region, the different age demographic composition proportion is considered and the existing apparent temperature model is modified on the basis of Steadman human heat balance equation. Then indoor comfort zone of residential building is obtained by generalized apparent temperature model reference to comfort zone of Beijing comfort index model. The generalized comfort dry-bulb temperature zone is acquired by critical value of generalized comfort zone. The critical value of generalized comfort dry-bulb temperature zone would be adopted to modify the outdoor start temperature of the central heating system and air-conditioning.

Abstract: Building automation system today employs an array of subsystems, communication protocols, data formats and software platforms. Some of these are proprietary, others are standards-based, but in neither case can true integration and interoperability be achieved. In addition to this, the traditional isolated subsystem within a building prevent renter and visitor from easily accessing the building resource and property manager from managing and maintaining the building. To address these issues, we describe a novel type of intelligent building system that merges IT technology with automation control technology. It allows devices from different manufactures to be integrated together seamlessly within one WEB-enable automation system; that enable property manager configuring, monitoring, and maintenance of heterogeneous subsystems with a unified application from a browser anywhere and anytime. It is seen that this approach provides the possibility to leverage current building automation technology into next high level.

Abstract: Combined with the geological conditions and the project features, the selection problem of pilot tunnel construction method of Huangzhuang station is solved. Directing at the commonly used method including CD method, CRD method and double side wall pilot tunnel method, FLAC3D numerical calculation method is adapted to analysis and predict the ground surface deformation and supporting structure hand features. Through analyzing the size and law of surface settlement in this section, the feasibility and differences of these methods is concluded and analyzed. And finally an example is given.

Abstract: Effect of the lattice distortion of the main crystal mullite, addition of copper mine tailing and the firing schedule on the infrared properties were studied. The study revealed that the higher lattice distortion is, the higher infrared emissivity of ceramic tiles is. The addition of raw materials containing iron and other elemental impurities could form the solid solution in the body what promote the degree of lattice distortion of main crystal which affects the infrared emissivity of the ceramic tiles. With the increasing of firing temperature, the degree of lattice distortion of main crystals will decrease and the infrared properties also decrease.

Abstract: This article analyzes the form of carbon discharge within the building life cycle, and indicates the relationship between energy saving and carbon reduction. It puts forward that when selecting the cooling and heating source, we should define the strength standard and assessment index of carbon discharge. While we weigh the energy rationality, low carbon charge should be taken into consideration, in order to reduce the CO₂ discharge in buildings.

Abstract: Field environment parameters of the waiting room of the railway station were measured. By the data obtained by testing, this paper analyzes the indoor field environmental quality of the large space building and evaluates the thermal comfort of activities of the major regional staff. It turned out that the indoor environment barely meets the requirements of thermal comfort, quality of acoustic environment beyond the standards, light environment is perfect and indoor air quality is poor.

Abstract: The numerical simulation of indoor airflow and poison gas diffusion and transport process is given for different air systems of air-conditioning in large space buildings in this paper. The numerical results show that the poison gas diffusion is affected by indoor airflow, and the variety air systems make the characteristics of poison gas diffusion differently. After arriving at the air return, the poison gas will soon be sprayed from the air inlet of the air system to the whole space which is serviced by the air system.