Applied Mechanics and Materials Vols. 256-259

Abstract: General concept of composite slab and present situation of research and development, combined with 17 China Metallurgical Group Corporation of China and Anhui Institute of architecture industry research project on cooperative development of laminated slabs, summed up the new type of prestressed concrete composite slab structure and application of large-span laminated slabs of concrete, will be the future important direction of development.

Abstract: With the advance of China's urbanization, the quantity and quality requirements for residential buildings are getting higher and higher, the housing industry is an important way to promote China's urbanization. The prefabricated concrete structures of the technical development and promotion is an important means to achieve housing industry .And to research a reasonable form of beam-column connection is the top priority of the prefabricated concrete structures research and promotion. This paper summarizes the recent year’s domestic prefabricated concrete frame structure beam-column connection form and seismic performance.

Abstract: According to the important role of the league shear wall seismic capacity in the practical engineering, a brief and effective finite element static push-over analysis model was established through using the MIDAS GEN7.95. With the changes in the coupling beam rigidity and reinforcement ratio, the structural base shear, structural failure displacement change during the simulation. On the basis, the curve of the coupling wall-beam rigidity, reinforcement ratio vs. base shear and failure displacement were built respectively. The results show that the coupling wall beam stiffness, reinforcement ratio and league shear wall seismic capacity have a significant effect relationship, which provides an important reference for shear wall seismic design of structures.

Abstract: A moment-shear story model using the static condensation method is proposed for the steel frame with semi-rigid connections. Based on the superposition principle under small deformation, the story horizontal deflection can be divided into three parts, due to the action of story shears, the top story moment of column and the connection rotation of bottom story column, respectively. The formulas are derived for its lateral stiffness, horizontal deflection and height ratio of inflection point of column, taking into account the effect of semi-rigid connection. Numerical results indicate that this story model is reliable and can be used for preliminary design of this type of structures.

Abstract: The most of Long-span stadium roofs are complex surface, the load norms cannot put forward the design requirements clearly in frequently. Determine wind loads need to use other means for help, while the numerical wind tunnel is one of the commonly be used to research methods in recent years. This paper introduces about the numerical simulation method of a long-span stadium roof surface wind pressure distribution , and based on FLUENT platform, a gymnasium as an example, the shear stress transport k - ω model (referred to as the SST k - ω model) on the roof surface wind pressure distribution of numerical wind tunnel simulation, analysis stadium roof surface pressure distribution law based on different wind directions.

Abstract: To understand all-round mechanical performance of RC slabs strengthened by Carbon Fiber Sheet (CFS) bonding with the inorganic adhesive after fire, Conjugate Method is used to analyze the whole mechanical process from loading to failure. On the base of plane section assumption, Moment- Curvature curves are obtained by iterative computation program. Load-displacement curves of slabs at mid-span after fire are obtained by Conjugate Method, and furthermore, curve of moment-sheet stress relationship is obtained, stress of CFS is analyzed. The test and analysis results show that, for RC slabs strengthened by CFS bonded with an inorganic adhesive, maximum stress of composite sheet decreases with small amplitude compared with that at room temperature, and the strength of the sheet can be utilized to a great extent, even if temperature (about 200°C~300°C) an inorganic adhesive experienced outclasses softening temperatures of ordinary organic epoxy adhesives. Slabs strengthened by CFS bonded with inorganic adhesive perform good fire behavior.

Abstract: Eco-composite wall, as the main bearing member of the eco-composite wall structure, has unique structural characteristic compared with traditional wall. The constructional features, mechanical properties and collaborative performance of the wall are analyzed. Based on this, the three-stage mechanical model of eco-composite wall is put forward. The study results indicate that the eco-composite wall has unique structural characteristic, which makes the structure in possession of several seismic defending lines and have good seismic performance. The three-stage mechanical model is proved reasonable and applicable in structural design.

Abstract: This paper introduces practical measurement of steel fiber distribution in steel fiber reinforced concrete (SFRC) which serves as the matrix of prestressed SFRC beams. Using digital image processing in mesos-copical mechanism of SFRC, “the Dynamic System of Measuring Steel Fiber Distribution” is developed. Compared with theoretical analysis, the system is practical and valid, and a new method is provided for guiding production technology of SFRC and controlling constructional quality.

Abstract: The flow around a finite-length square prism with aspect ratio of 5 is numerical investigated using LES at Red = 3900. The prism is mounted on a flat wall, with one end free. Based on the simulation results, it is found that the near wake is highly three dimensional under the effects of free-end downwash flow. The shear layers from prism side walls and free end form an arch-type structure. There are two typical flow modes presence in the near wake: first, the spanwise vortices are staggered arranged similar to that in 2D cylinder wake; second, the spanwise vortices are quasi-symmetrically arranged. These two modes occur alternately and intermittently. When the first mode occurs, the pressure on the prism side surface fluctuates periodically, corresponding to large values of drag and fluctuating lift coefficients; when the second modes occurs, there is no obvious pressure fluctuation on prism side surfaces, and the correspond drag and fluctuation life coefficients are significantly smaller than those for the first mode.

Abstract: This paper presents the latest developments of a simple method used to determine the ultimate load of two-way simply supported reinforced concrete slabs. Based on the reinforcement ratio, two failure criteria are proposed in the paper. The effectiveness of the developed model is validated through satisfactory comparison with from test results.