Applied Mechanics and Materials Vols. 99-100

Abstract: By the study of construction of casting box girder of Songpu Bridge in Harbin, and the actual site geology, hydrology and the corresponding norms, this paper designed temporary support with the method of allowable stress. It was proved that the temporary support met the need of the site construction, both to ensure casting construction quality, but also save construction costs and speed up the construction progress, which provided a new way for the construction of large-span continuous box girder.

Abstract: Based on the monitoring data of pavement performances and traffic volume from the China key projects, the expressways from Shenyang to Shanhaiguan and from Panjin to Haicheng, the effects of asphalt pavement preventive conservation measures utilized in the two expressways and the remaining equivalent standard loads are evaluated. Three models are adopted to predict the pavement performances for the two expressways in six years by the regressing analysis and the reasonable performance prediction models are accomplished through modifying the initial models by the actual monitoring data.

Abstract: Architectural physical environment is the most important determined elements of people comfortably using architectural space. This paper firstly analyzes the physical environment's constitution for architectural space; uses analytic hierarchy process(AHP) to establish a kind of comprehensive evaluation model for physical environment of architectural space to divide them into three-level evaluation indexes; then calculated the weight value of each index for scheme layer; at the same time, selects four teaching buildings as evaluation instances and provides the value of each index for physical environment of architectural space by experts' scoring method; at last, weights and composites with the foregoing weigh to obtain the comprehensive scores of each teaching buildings and conducts the comprehensive evaluation.

Abstract: Abstract. This research was to enhance strength and durability of concrete in both design and construction with gangue. Particularly, the strength and performance of concrete is achieved by optimizing the gangue, fly ash and silica fume replacement for cement. The gangue has been used as a cementitious material. The many technical benefits available to concrete user, such as reduced heat evolution, lower permeability and higher strength at later ages, in order to increase resistance to sulphate attack and alkali silica reaction. A number of recommendations are given for the effective use of gangue and fly ash in concrete. The results show that 10% gangue, 15% slag, 15% fly ash, 10% silica fume of replacement was found to be an optimum level and demonstrated excellent performance in concrete. The paper is intended to provide guidance for those concerned with the design, application and performance of concrete with gangue in practice where gangue can also help to reduce costs and energy demands in the production of concrete compared with conventional Portland cement concrete.

Abstract: The theoretical formula is proposed for cross section’s bending capacity of simply-supported U-section steel-encased concrete composite beams. The result shows that the theoretical formula is in good agreement with the experimental results. This paper concludes that the calculated values based on current steel structure design code of China are very close to the experimental ones. Therefore, this kind of composite beams can be analyzed based on the calculation methods of composite steel and concrete beams in steel structure design code, and it is accurate to calculate the bending capacity based on the assumption of complete shear connection.

Abstract: Abstract. Based on the monitored surrounding rock displacement and the settlement of ground surface and structures of No.7381 tunnel in Harbin, major factors which influence the safety of construction are analyzed and discussed. Results of the analyses indicated, enlargement excavation of tunnel has significant effect on the settlement of ground surface but has less effect on surrounding rock displacement and settlement of structures. Enlargement excavation during rainy season relay influences the structures and ground surface, by contrast, it influences the open-cut part a lot especially for the stability of slopes. It is pointed that the scope which seasonally frozen ground influences in open-cut part is larger than that in underground excavation part but have less effect on the displacement of surrounding rock underground. Seasonally frozen ground also leads to a remarkable displacement of ground surface. The application of temporary steel bracing is needed and effective for controlling surrounding rock displacement and the settlement of ground surface.

Abstract: Based on strain energy equivalent, the background response equivalent static wind load of large span roof is derived. It solves the matter that should consider numerous structural response control objects on calculating equivalent static wind load of large span roofs, and establishes relationship with the structural strain energy introduced by fluctuant wind loads. Finally, the method is used to background equivalent static wind load analysis of China National Stadium roof structure. The results illustrate that the method proposed in this paper is effective and the precision is reliable.

Abstract: The operation of the Three Gorges power station is of the most complex feature in China and even in the world, for it involves many factors such as flood control, power generation, shipping and water supply. This paper takes the experimental reservoir impoundment in 2008 for example, demonstrated its impact on power grid operation, meanwhile, put forward suggestions on impoundment time, impoundment target, impoundment and fluctuating process and adjusting mechanism building, etc.

Abstract: Access to the internal concrete temperature of the instantaneous temperature field and the strength of the field Real-time monitoring , Concrete temperature field and stress field of the numerical simulation analysis method was proposed . Intuitive accurate prediction that the temperature field and stress field provide a reliable basis on the distribution of temperature control schemes and the construction scheme formulated.

Abstract: As the largest unit capacity of nuclear power plant at present, the flow conduit of circulating water pump in EPR1750 nuclear power plant is a volute conduit, which is a cast-in-situ conceret structure with complexly gradual change cavity. Therefore, the hydraulic efficiency of circulating water pump is not only related with the design of pump leaves, but also closely related to the design of volute and the complicated spatial type of intake and outtake conduits. With the pump leaves and the intake and outtake conduits of conceret volute as the research model, based on computational fluid dynamics (CFD)and the three dimensional Reynolds averaged Navier-Stokes equations, an analytic model suitable for computation is established to simulate the three-dimensional steady flow in the whole pumping system under different operating modes. By use of the commercial fluid-computation softer ANSYS, the distribution of basic physic quantities in the fluid field inside the pump and the conduits is obtained. The analysis and prediction of the performance of pump system are made, and the spatial type design of intake and outtake conduits is evaluated. The calculation results can be referenced to improve the design of pump systems in the similar projects.