Advanced Materials Research Vols. 919-921

Abstract: Due to the constraints of the cost, the space and other factors, scale model of the building structure is commonly used in the study of blast effect on building structure experiment. However, in order to make the experimental results reflect the real prototype structure characteristics, the accuracy of the similarities between the prototype structure and the scale model must be ensured. Therefore, its important to study the way to solve the existing problems in the design of the experiment of RC model of frame structure under the influence of the loads of the internal explosion, which is designed to provide some references for the similar experiments in the future.

Abstract: In this paper, reinforcement effect of the seismic performance of injured flat cross-shaped reinforced concrete frame joints under different axial compression ratio are analysed systematically through experiment.The research focuses on the relationship between the effect of reinforcement with carbon fiber and axial compression ratio. Three identical joints under different axial compression ratio are loaded by low cyclic load in the experiment to study the seismic performance of them.

Abstract: A test of bending resistance and reinforcement is carried out on RC beams by applying sheet of glass fiber reinforced plastics (GFRP). A study and analysis is given to the traits of bending and rupture of RC beams reinforced by applying GFRP and to the effect of GFRP on ultimate bearing capacity and stiffness of the beams. The strengthening effect is investigated to give guidance in practice work.

Abstract: Thermal stress is a major cause of early-age crack of massive concrete structures. In order to analyze the influencing factors of concrete crack under thermal loads, a series of tests were conducted using the improved Temperature Stress Testing Machine (TSTM). Effects of temperature on crack resistance of concrete were studied on different concrete placing temperatures and curing temperatures. Meanwhile, the roles of reinforcement on concrete crack resistance and crack-width limitation were quantitative analyzed, which compare cracks of plain concrete and reinforced concrete with the same mix proportion. The results indicate that reinforcement can improve the crack resistance of the structures by approximately twenty percents, which against the engineering experience. After concrete cracks, the cracks photos show that reinforcement can induce the smaller cracks formation, and the crack width of reinforced concrete is about 1/10 of the plain concrete crack width.

Abstract: This paper illustrates the experimental study on the glued bamboo beam. The beams are characterized by the brittle tensile damage. The elastic modulus for both the compression and the tension of the glued bamboo are equal to each other. The average strain for the cross-section of the glued bamboo beam is linear distribution during the test process. Thus the plane cross-section assumption can be used for calculating the glued bamboo beam when designing. All the deflections for the ultimate load point are more than 60 mm and far bigger than the value 8.4mm (L/250) which is the maximum allowable deflection required by the Chinese wood structure design specification.

Abstract: Six stone slabs with near surface mounted steel bar were tested to study the flexural behavior of stone slab. The test parameters included the slotting dimension and steel reinforcement ratio. The test results show that the measure of near surface mounted steel bar can significantly increase the flexural capacity and ultimate deflection. The flexural behavior of stone slabs with near surface mounted steel bar is less affected by the slotting dimension; steel reinforcement ratio is the important factor influencing flexural behavior. With higher steel reinforcement ratio, the failure mode has transformed from brittle fracture into ductile failure; cracking load, ultimate load and displacement are largely increased by 10.2%131.9%617%. The mid-span section strain distribution complies with the plane-section assumption. Stone slabs with near surface mounted steel bar can fully exert the strength of stone and steel bar.

Abstract: In order to investigate deformation and failure of reinforced concrete beams subjected to combined actions of explosion and post-explosion fire, A three-dimensional numerical approach was developed with finite element software ABAQUS. And the numerical approach consists of three steps: quasi-static analysis, explicit dynamic analysis and sequentially coupled thermal stress analysis. The rate-sensitivity and temperature property of material were included in the constitutive model, Fire resistance of reinforced concrete beams subjected to explosion and post-explosion fire was investigated by the method quantificationally. It is demonstrated that fire resistance of reinforced concrete beams is reduced by the action of explosion.

Abstract: As the landmark building of whole city,the gymnasium represents the image of the city.The gymnasium must be clean,concise and grand in extrinsic feature.The gymnasium must also be stable,safety and deal with accidents.Building gymnasium no only is according to the appearance and safety,but also considers efficiency and cost in this era in which technology is developing very rapdily.Excess resources and large volume will lead to wasting material and time.For saving labor and resources, ANSYS is applied to optimize the size of I beams which are used to build the triangular light roof of gymnasium in this paper. According to the optimization results,the weight of structure is optimal when size of I beams are 150×150,stress of structure is in the safety margin at the same time.

Abstract: Shallow shells with variable thickness based on rectangular plan are considered. Middle surface of shells has variable form and depends on the high of supporting arches, the boundary conditions, and the thickness. Critical force coefficient and stresses of variable form shells are investigated by Bubnov-Galerkin method. The calculation method has done by the Maple program complex.

Abstract: The collaborative work between fiber reinforced polymer (FRP) and concrete is achieved through the binder, so the interface of them is the weak links. The interfacial slip between FRP and concrete beam is one of the key factors to affect the behaviors of RC beams strengthened with FRP plate. According to elasticity theory, this study analyzes the theoretical analysis of interfacial slip of RC beams strengthened with FRP plate under mid-span concentrated loads. The analytical model is established, and the differential equation of interfacial slip of RC beams strengthened with FRP plate is established. Using the boundary conditions, the calculated formula of interfacial slip is deduced under mid-span concentrated loads.