Applied Mechanics and Materials Vols. 438-439

Abstract: This paper introduces the test results of eight steel fiber reinforced lightweight aggregate concrete (SFRLAC) superposed two-way slabs under punching load. The tensile and compressive zones of the slabs were cast with the SFRLAC and the ordinary concrete respectively. The slab was simply supported along the four edges under central concentrated load on the short column. The main parameter of SFRLAC was the fraction of steel fiber by volume of 0.8%, 1.2% and 1.6%. The measurements were made such as the deflection, the strains of steel bar and concrete, the crack distribution, the loads corresponding to the yielding of steel bar and the ultimate state. It proved that the punching resistance of SFRLAC superposed two-way slab increased about 51%~78% with the increasing fraction of steel fiber by volume, the ability to resist punching deformation was enhanced remarkably, many fine cracks distributed on the tensile surface, and the ductility at failure state increased to a certain degree.

Abstract: Structural effect character is one of the important properties of soft clay. It has great influences on its physical and mechanical properties, especially on its deformation features. On the basis of the laboratory tests, the structural behavior of marine soft clay in Pearl River Delta region under the low frequency cyclic loading was tested and analyzed. Combined with both macro-analysis and micro-analysis, it was found that the structural character of the soft clay has great influences on both its compression deformation features and its shearing deformation features.

Abstract: Performance appraisal is widely considered to be the critical factor of construction enterprise informatization. The 0-1 three scale method is used to determine the weights of factors to enhance convergence rate and uniformity of judgment matrix, the fuzzy consistent matrix is applied to decrease subjectivity, and fuzzy comprehensive evaluation is utilized to realize the appraisal at last. Use case to prove the method applicability of performance appraisal of construction enterprise informatization. The results show that the method established is more scientific and reasonable.

Abstract: Through low cycle reverse tests of three steel fiber reinforced concrete coupled shear walls, the crack pattern, bearing capacity, stiffness and displacement are analyzed. Test results show that the bearing capacity, yielding stiffness and the anti-crack performance of the coupled shear walls are generally improved by adding steel fibers to reinforced concrete coupling beams, and the stiffness degeneration is also reduced to a certain degree. More cracks are induced by steel fibers bridged the main crack, which can make the shear wall consume more energy.

Abstract: In order to improve thermal performance of external wall of rural residence in cold region, combining with construction situation, this paper selects the typical building model to analyze the corresponding construction and energy consumption. According to the climate features and resource condition of the region, some suitable constructions of external wall in rural residence are put forward and the energy efficiency effect is analyzed. It is hoped to provide some valuably theoretical foundations for energy saving studies on rural residence in cold region.

Abstract: t is focused on a super high-rise building structure, of which the concrete compressive strength is reduced in joint core. The whole structure is calculated with program SATWE. Based on this calculation, integral stress analysis by MIDAS when concrete strength is reduced in joint core area and nonlinear finite element analysis by ANSYS on the joints of the worst cross-sections in the whole structure are developed. Thus the adverse effect of reduced concrete strength in joint core area on super high-rise structures is found out.

Abstract: This paper studies the influences of factors such as axial compressive ratio and shear wall thickness on the mechanical performance of the reinforced concrete column strengthening with shear wall under low-cyclic reversed loading. Considering the secondary stress characteristics of the strengthening column, a numerical analysis was made on the load displacement hysteretic curve and skeleton curve. The results show that, with the increasing of axial compression ratio, the bearing capacity and stiffness of reinforced concrete column increased, but the ductility of reinforced column reduced; the bearing capacity and rigidity of reinforced column strengthening with shear wall increase while the ductile was lower; the change of shear wall thickness has a little effect on the bearing capacity, but improves the energy dissipation capacity of reinforced concrete columns.

Abstract: This paper reports on part of an ongoing experimental program at The University of Adelaide on FRP-concrete-steel composite columns. A total of eight high-strength concrete double-skin tubular columns (DSTCs) were tested under axial compression. The column parameters examined included the diameter, thickness, and shape of inner steel tube. The results of the experimental study show that increasing the inner steel tube diameter leads to an increase in the ultimate axial stress and strain of concrete in DSTCs. The results also show that increasing inner steel tube thickness leads to an increase in the ultimate axial stress and strain of DSTCs. Furthermore, it is observed that concrete inside DSTCs with square inner steel tubes is not confined as effectively as concrete inside DSTCs with circular inner steel tubes.

Abstract: Shear wall with concrete filled steel tube columns and concealed trusses is a new kind of shear wall. In order to further the seismic performance of the new shear wall, experiment was carried on three 1/5 scale models, which included one traditional RC shear wall, one shear wall with concrete filled steel tube columns, one shear wall with concrete filled steel tube columns and concealed trusses. Based on the experimental study, load-carrying capacity and hysteretic property of each model were analyzed. The study show that the seismic performance of shear wall with concrete filled round steel tube columns and concealed steel trusses has high bearing capacity and good hysteretic property. Load carrying capacity calculation of shear wall with concrete filled steel tube columns and concealed steel trusses were carried out, the calculate results were in good agreement with the measured results.

Abstract: At present, there exist more and more adding storey building in China, the research on the reconstruction project is also increasing. There are no corresponding technical specifications to constraint the concrete that add steel structure to the concrete structure, this is a blank area. A hospital floor in Shanxi is on the basis of the original eight-story reinforced concrete shear wall, using steel reinforced concrete to transition, adding five-story steel frame-buckling support structure. Using the large-scale finite element analysis software ANSYS, this paper analyzes the increasing cross-section method of reinforced concrete column to obtain the stress-strain situation of the old and the new combination surface and the stress-strain before and after the column reinforcement, proposes design measures to resist the shear on the old and the new combination surface working together to reduce the stress-strain hysteresis effect. The results provide a reference for similar project.