Advanced Materials Research Vols. 671-674

Abstract: The height of a complex supertall building is 250m. The central RC tube and peripheral SRC frame with a strengthened truss and a transfer truss are employed to resist vertical and lateral loads. At first, a shaking table test was performed on a 1/30 scaled model of the building to study its dynamic characteristics and to evaluate its earthquake resistant capacity. Then, a 3D finite element analysis of model structure was carried out. Finally, the analytical results were compared with the experimental ones to gain a better understanding of the structural behavior.

Abstract: Experiments of a piece of comparable block wall and five pieces of block walls with different constructional type subjected to low reversed cyclic loading have been conducted. Investigation has been made on the failure pattern, hysteretic loop curves, displacement-restoring capacity and displacement ductility of walls. The experimental results revealed that the seismic performance of block masonry walls, which used the constructional column and concrete strips, was improved remarkably. It set a sound basis for further analysis research and engineering practice on AAC load-bearing walls in the future.

Abstract: The concrete-filled glass fiber reinforced gypsum wall panel is a kind of panel that the inside cavums of the glass fiber hollow gypsum panel is filled with concrete. The experimental results indicate that the concrete-filled glass fiber reinforced gypsum wall panel which has a better performance of the force and can be used to be the bearing wall of a building can form a novel structural system. When the beams supporting the wall panels, the wall panels which under the beams is in local state of compression. It were gained that when the wall panels are in the local compression state , local pressure loads are primarily borne by the concrete core columns and fiber gypsum board will damage in advance through the eighteen experimental wall panel specimens which in local compression. The test results show that the final destruction of the concrete is caused by being crushed and the contribution of the gypsum wall panel to local compression bearing is small. Compressive stress can only spread in the local loading on concrete core columns, cannot be expanded into an adjacent stud. Finally, the local compression bearing capacity calculation formula of the concrete-filled glass fiber reinforced gypsum wall panel is obtained by analysis of the test results.

Abstract: Tests were conducted to investigate the inhibiting effect on steel bars in concrete contaminated with 0.75% (wt.) chloride of the cementitious materials by adding inhibitor in green concrete or surface painting inhabitor on cover concrete. The results show that the anticorrosion effect of surface painting inhibitor on concrete with 30mm cover at 400g.m^-2 are mainly better than that of adding 2% inhibitors in concrete with 0.75%(wt.) NaCl of the cementitious materials. The minimum corrosion current of steel bar in concrete sample after painting MCI-C12 28 days can be reduced to 0.084 μA.cm^-2 from 1.30 μA.cm^-2 of the sample before painting inhibitor. The corrosion current of steel bars in concrete samples painted with MCI-2010 and sodium nitrite solution are roughly equal to that of the control concrete sample without chloride, and less than that of the sample added in nitrite and chloride. Compared with mixed inhibitor in green concrete, surface applied inhibitor on hardened concrete not only avoid to affect the properties of concrete, but also bring to the visible economical advantage.

Abstract: A new kind of mild steel damper which use corrugated plate as energy-intensive steel plate is proposed in this paper. The structures and energy dissipation principles of the new type damper are presented. The hysteretic performances of corrugated mild steel damper with different height-thickness ratio, or with the same height-thickness ratio but with different thickness are analysed by numerical simulation with ABAQUS platform and then parameter study on this kind of damper in detail. The results show that the corrugated steel damper has good and stable energy dissipation performance. The performance of energy consumption increases with the decreasing of height-thickness ratio. When at the same height-thickness ratio, the performance of energy consumption increases with the thickness of energy-intensive steel plate.

Abstract: Accompanied by masonry uniformly qualitative theory, the analysis was made for the influence on existing brick building with numerical simulation method. The stress and its distribution in the structure with differential settlement were calculated. Pointing out the parts with high stress, the work provides analytical reference to state assessment of existing buildings.

Abstract: This paper present the geometrical parameters were conducted to study how they impact the fatigue of the girders with corrugated web by a comprehensive finite element method. Different parameters, such as the oblique angle of the web, the radius of curvature between the web folds, the thickness and width of flange, the height of the beam were investigated. The research object were : promote the application of this structure, especially for corrugated steel web composite bridges on the fatigue design theory and method provide the standard. The numerical results show that geometrical parameters of girders with corrugated webs have great effect on the stress concentration of weld toes. In addition, weld depth and angle have greater impact on the fatigue of the beams with corrugated webs.

Abstract: The numerical analysis method is applied to simulate the whole process of bending. Keeping the section dimensions and the types of loads constant in prestressed concrete hollow slab with mid-strength spiral-rib steel wire, strength of concrete, strength of steel bar, reinforcement ratio, span-depth ratio and stretching control stress are analyzed and compared. The influence of reinforcement ratio to the ductile property in prestressed concrete hollow slab is discussed by numerical simulation.

Abstract: Based on the research of normal confined concrete (NCC), regional confined concrete (RCC) was proposed years ago by authors. With the introduction of regional confinement concept, different mechanical properties, failure mode and energy dispatching property developed in the regional confined concrete elements. Experimental researches have been carried out during the past years on the elements under various loads, including beams under moments, short beams under shears, short columns under axial loads, middle long columns under eccentric loads, middle long columns under axial loads and columns under cycling loads. Experimental results indicated that RCC elements are more ductile, have better load carrying capacity and larger energy dispatch capacity than that of NCC elements. Stress-strain relationship of RCC, integrated confinement factor and some computation expressions for elements under various loads are proposed. Pilot projects have been conducted and regional confined concrete structures are ready for service.

Abstract: By briefly introducing the features and development of strut-and-tie model (STM) , this paper reveals the advantages of designing deep beams with this method. The procedures of designing reinforced concrete deep beams are introduced in this paper as well. In addition, the key issues, such as how to determine the appropriate STM model, how to calculate member forces and the consideration about web splitting are discussed to ensure the introduction of STM in concrete is comprehensive.