Advanced Materials Research Vols. 446-449

Abstract: The steel-plate reinforced concrete shear wall with rectangular concrete filled steel tube (CFST) columns is a new kind of composite shear wall. In order to ascertain its seismic behavior and failure mechanism, four 1/5 scale specimens with the same shear span ratio 1.5, different thickness of the steel-plate and different axial force ratio, were tested under horizontal cyclic loading. The thickness of steel-plate in the walls is 2mm, 4mm, 4mm and 6mm, respectively. Based on the experiment, the load-bearing capacity, hysteretic characteristics, ductility, stiffness degradation, energy dissipation capacity and failure mode of the specimens were contrastively analyzed. And the effect of the ratio of height to sectional thickness of steel-plate and the value changes of axial force ratio on seismic behavior of the new shear wall was also analyzed. The result shows that the steel-plate reinforced concrete shear wall with rectangular CFST columns has good seismic performance and important engineering value.

Abstract: Mid-story isolation structure is developing from base isolation structures. As a complex structural system, the work mechanism of base isolation structure is not entirely appropriate for mid-story isolation structure, and the prolonging of structural natural period may not be able to decrease the seismic response of substructure and superstructure simultaneously. In this paper, for a four-story steel frame model, whose prototype first natural period is about 1s without seismic isolation design, the seismic responses and isolation effectiveness of mid-story isolation system with lead rubber bearing are studied experimentally by changing the location of isolation layer. Respectively, the locations of isolation layer are set at bottom of the first story, top of the first story, top of the second story and top of the third story. The results show that mid-story isolation can reduce seismic response in general, and substructure acceleration may be amplified.

Abstract: By using the SHPB device, uniaxial impact compression test of concrete were carried out at different temperature (20°C to 650°C). The strength data of concrete at different temperatures and different stain rates was obtained and uniaxial compressive failure criteria of concrete were obtained, in which the high temperature and the strain rate were considered, and it would provide reference for actual projects

Abstract: An elastic-plastic pushover analysis has been performed to a typical two-bay light-weight steel portal frame for investigation of the nonlinear load-deformation behaviors of the structure under strong wind loading. The finite-element model is first established for the portal frame. Then the monotonically increased lateral load and uniformly distributed vertical load representing wind loading are applied to the frame while the structure deforms from full elastic range to elastic-plastic stage. The loading process continues until the top displacement reaches its target value or enough number of plastic hinges occurs so that the structure changes to an unstable mechanism. The analysis results indicate that different lateral loading modes (top point loading or uniformly distributed loading) lead to almost the same deformation and failure behavior of the frame, and the final load-carrying capacity of the frame considerably decreases with increase of the vertical loading.

Abstract: In the cement silos of a factory, decompression cone’s column have a lot of damage in the process of using, which occurred mainly in the form of vertical, crossing, horizontal cracks or partial crush, according to the scene of the accident situation. Therefore, we put forward a set of approximate calculation method, and find out that the main reason is the insufficiency of the bearing capacity in original design.

Abstract: According to the structural design in a project in Dalian, experimental study on seismic behavior of composite core walls with steel tube-reinforced concrete (STRC) columns were carried out. Five 1/6 scale composite core wall specimens with different steel reinforced details in the walls and different openings on the walls were designed and tested under cyclic loading. Based on the experiment, hysteretic property, load-carrying capacity, ductility, energy dissipation capacity and damage characteristics of the five specimens were compared and analyzed. The results show that the core walls with STRC columns have good seismic behavior. And the seismic behavior can be greatly improved by setting concealed steel trusses in the walls.

Abstract: Foldable structures are rapid to erect and easy to collapse for reuse. Four basically geometric design parameters of self-locking foldable latticed shell unit were defined. The recommended ranges of the geometric parameters and cross-section sizes were given by investigating foldable latticed shell units using ANSYS, with the consideration of element stability and the requirements of elastic design.

Abstract: Based on the experience of earthquake, through the search and summary on natural features of the hilly cities , aim at the common problem exist in disaster prevent in urban planning and lost in research, research on the specific construction model and technical methods in four-dimensional disaster prevention space of the hilly cities which possess dynamic and comprehensive.

Abstract: This paper presents a suitable solution of studying on the performance of energy consumption of BRB. The hysteretic curve of BRB is got with finite element software, and is lead into steel frame by virtual hinge. The results show that the BRB has more advantages in reducing the structural displacement and protecting the safety of the main structure compared with the general braces.

Abstract: This paper presents the results of an experimental program for a novel composite beam of concrete-filled steel tube (CFST) truss with diagonal web members. This paper investigated the static performance and failure modes of the composite beam. Load-deformation relationships and deflection regulation of the test beam were obtained and its performance was evaluated in terms of its stiffness and bearing capacity. The strain distribution within critical components was also analyzed. The experimental results showed that the composite beam of CFST truss with diagonal web members has high strength and ductility performance. It markedly improves the stiffness and strength of the composite beam of CFST truss with straight web members