Applied Mechanics and Materials Vols. 353-356

Abstract: Column is the key member of the seismic structures, after the earthquake destroyed, not only cause column serious economic damage, and will cause a large number of casualties. For studying the seismic behavior and size effect of full-scale reinforced concrete columns. A comprehensive summary of the experimental results is undertaken to evaluate the seismic behavior of RC concrete columns, including test equipment and load method and mode of failure and Seismic behavior. It is concluded that the ductility and shear capacity of RC mainly depends on shear span ratio, axial load ratio and stirrup ratio. But the seismic behavior of large scale RC columns has no systematic studied.

Abstract: Structure would be in different extent of translational-torsional coupling due to the inconsistent of mass center and stiffness center which caused by the irregularity of floor mass and stiffness distribution. At present, the research on seismic response of the eccentric structure was not perfect, especially the translational-torsional coupling response considering soil-structure interaction. This paper briefly reviewed the research status on the lateral-torsional coupling considering soil structure interaction effect and point out several problems existing currently in the field in order to make necessary preparations for analyzing seismic response of eccentric structure more in-depth.

Abstract: According to hot-rolled Q235 steel, four specimens of Buckling-restrained Brace of two sections and two composed methods were designed for Chinese steel market. The paper conducted the low-cyclical loading tests to detect the seismic performance of Buckling-restrained Brace. The force-deformation loops, the tangent stiffness and the equivalent damping ratio were studied. It is proved that the force-deformation loops of BRB are stable, plump and symmetrical. The equivalent stiffness and damping ratio are unaffected by steel variety and section form. Double angle steel core segments welded or no does not affect the interoperability, stiffness, ductility, energy consumption of BRB, and the collaborative is only associated with the relative stiffness of steel core and pipe.

Abstract: The multi-mass analysis models of story isolation and general structure are established, major parameters are optimized on story isolation structure, with time-history analysis for isolation layers in different position, the contributions of modes and damping effects of absolute acceleration and story drift about story-isolation structure are analysed. Result indicates that after the parametric optimization, the natural period of story-isolation structure is longer than that of general structure; no matter where the position of isolation layer is, the damping effects are always obviously; the position of isolation layer has direct influence on the damping effect, damping effect gradually reduce when the isolation layer raised, and the contributions of high modes to dynamic responses increase; it's worth noting that infrastructure absolute acceleration magnify to some extent compared with general structure.

Abstract: Reasonably effective methods of FRP strengthening can dramatically improve the ultimate bearing capacity, ductility and seismic performance of reinforced concrete frame joints. This paper, based on domestic and foreign experimental research and finite element numerical simulation which are working at improving bearing capacity and seismic performance of reinforced concrete frame joints, analyzes mechanism and performance factors of RC frame joints reinforced with FRP material, concludes with basic ideas and methods of FRP material RC joints, together with the direction of continuing studies.

Abstract: Numerical analyzing approach about a novel seismic isolation system, DFPS (Double Slippingsurfaced Friction Plate System), is presented in this paper. It starts from Lagrange equation, its governing equation is similar to that of the FPS friction pendulum system with single slipping surface. Result shows that storey drift resulted from seismic action tend to be even along the height, and interstorey drift, storey velocity and acceleration are significantly decreased on buildings equipped with DFPS system. An optimistic combination of them could exhibit good seismic isolation efficiency. It could reach 70% for μ=0.05, r=3.5m.

Abstract: This paper addresses the seismic behavior of pseudo strain hardening cementitious composite (PSH2C) coupling beams with different failure modes in hybrid coupled shear wall. Test variables included the ratio of steel coupling beam strength to beam-wall connection strength. The results show that Specimen PSH2C-SCF exhibits a better stable behavior in comparison with Specimens PSH2C-SBVRT and PSH2C-FCF.

Abstract: In order to study the effect of different models on caisson-soil interaction, a linear model and two nonlinear models are established by finite element software SAP2000. It is found that with the increase of amplitude of seismic wave, the effect of nonlinear properties of caisson-soil interaction is increasingly large. The linear model, however, is not suitable any more under such condition, while the nonlinear models can simulate caisson-soil interaction reasonably.

Abstract: In accordance with damages of infilled wall frame structures in Wenchuan earthquake, the current 2010 version of "Seismic Design Code of Building" is attached herewith increasing significance to infilled wall, which switches "consider the impact of infilled wall on seismic performance of frame structure and avoid main structure destruction caused by setting infilled wall unreasonably " from a general provision into a mandatory provision, however, a specific quantitative description on the impact of infilled wall on seismic performance of frame structure is still absent. The impact of infilled wall on seismic performance of frame structure is analyzed in the paper, and two suggestions pertain to design and research of infilled wall is proposed under current phase: on the one hand, "conceptual design" should be kept on highlighting in the seismic design of infilled wall frame structures; on the other hand, based on the concept of "performance-based seismic design", the idea that infilled wall should be treated distinctively is put forward.

Abstract: For frame structure, due to the uneven settlement of foundation, makes the whole framework of system with initial stress caused by uneven displacement, thus produce unfavorable influence on seismic performance of frame structure. By PMCAD modeling software and finite element module SATWE, analyse the initial stress effect on seismic performance of frame structure.Results show that under the influence of initial stress, the frame structure seismic performance declined.