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Zheng N.,Chongqing University | Zheng N.,Key Laboratory of Chinese Education Ministry for Construction and New Technology of Mountain Cities | Li Y.,Chongqing University | Li Y.,Key Laboratory of Chinese Education Ministry for Construction and New Technology of Mountain Cities | Liu F.,Chongqing Architectural Design Institute
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

Core-tie-column is a new style of tie-column with the advantage of making easier and costing cheaper. In order to study the seismic behavior of wall restrainted by core-tie-columns, pseudo-static testes of 11 specimens, which concluded 3 specimens without restraints, 2 specimens restrainted by cast-in-place tie-column and 6 specimens restrainted by core-tie-columns, were carried out, and the failure characteristics, strain of longitudinal bar, grid bar in tie-columns, hysteretic curves and dissipative of the specimens were investigated and contrasted. It is shown that, the restraints of core-tie-columns on the wall is effective so that the failure mode of the wall has been improved, the strains of most longitudinal bars and grid bars of core-tie-columns and tie bars between wall and core-tie-columns intend to yield strain. The hysteretic curves of the walls restrainted by core-tie-column are more dissipative. Above all, as similar as cast-in-place tie-columns, the core-tie-columns can improve the seismic behavior of the masonry wall greatly. Source

Cao A.-Y.,China University of Mining and Technology | Dou L.-M.,China University of Mining and Technology | Jiang H.,Chongqing Architectural Design Institute | Lv C.-G.,China University of Mining and Technology | And 2 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2011

In this paper, we theoretically analyze characteristics of stress drop, the strain energy release, and seismic radiation pattern associated with the rock tensile fracture and shear failure to reveal the corresponding burst risk ranks of coal-rock mass in various failure modes. The results show that the stress required to fail the rock and the associated energy released by rock failure are different, mainly depending on the fracture mode within the rock mass. In case of the same physical and mechanical properties, the energy released increases with the increase of fracture radius. Given the same fracture radius, the stress drop and energy released associated with shear failure are significantly greater than that of tensile fracture. In addition, in case of the same energy released, the fracture radius decreases with the increase of uniaxial compressive strength of the rock mass. Meanwhile, the seismic displacements and energy radiation patterns of different mining-induced tremors vary with different components of the moment tensors. The seismic waveforms of tensile fractures are always characterized by clear P-wave arrivals and the ratio of S- to P-wave energy or amplitude is relatively small, while the shear failures always present weak P-wave arrivals and the ratio of S- to P-wave energy or amplitude is much greater. Source

Wang T.,Southwest Jiaotong University | Shen R.-L.,Southwest Jiaotong University | Li H.,Chongqing Architectural Design Institute
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

The concept of cable-beam vibration was defined as forced vibration and parametric vibration of cables under the excitation of end displacements. The nonlinear finite element dynamic time-history integration method was combined with cable nonlinear vibration equations for studying cable-beam vibration. A numerical calculation model was built with programming, the characteristics of cable-beam vibration based on the numerical results were discussed. The computing results indicated that the cable local vibration has a distinct relationship with the global structural vibration. The results were close to practical situations. The proposed method could be used for building and investigating a global bridge finite element model. Source

Liu R.,Chongqing University | Wang M.,Chongqing University | Chen X.,Chongqing University | Zhu W.,Chongqing Architectural Design Institute | Fu J.,Chongqing University
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2016

Small-span-to-depth-ratio coupling beams of shear wall can be formed with a crack in the middle to prevent from shear failure and improve the seismic performance. Three coupling beams with same small-span-to-depth-ratio were tested under cyclic loading. Comparing the results of slotted coupling beams with other coupling beams of different forms of reinforcement, we analyzed the seismic behavior of the slotted coupling beam, including failure pattern, hysteresis loop, strength degradation, stiffness degradation, ductility and energy dissipation. We simulated skeleton curve of specimens' hysteresis curve by using ABAQUS and compared the simulation result mith the experiment result. The results show that slotted coupling beams with small-span-to-depth-ratio have good performance of bearing capacity and deformation. They can be constructed conveniently and economically. Besides, with the good seismic performance, small-span-to-depth-ratio coupling beams could prevent from shear failure effectively and be applied well in practical engineering. © 2016, China National Publications Import and Export (Group) Corporation. All right reserved. Source

Chen Z.,Chongqing University | Sun Y.,Chongqing University of Science and Technology | Zhang H.,China Third Design and Research Institute of Machinery Industrial | Zhang Z.,Chongqing Architectural Design Institute
International Journal of Structural Stability and Dynamics | Year: 2016

A wind tunnel test on a large-span cantilevered elliptical annular roof was carried out. The time series of wind pressures were tested simultaneously on the upper and lower surfaces of a roof structure rigid model, that was exposed to open and suburban boundary layer air flows in various wind directions. The spatial correlation characteristics of fluctuating pressures on the roof structure were analyzed. Both the analyzing results of the correlation coefficient in time domain and the coherence function in frequency domain indicated that the correlation structure of the fluctuating pressure of a large-span roof is sensitive to the location of the investigated taps, the roof geometry, the wind direction, and the inflow turbulence. Therefore, the simulation methodology, using a single coherence function, based on the spatial interval of two taps, ignoring the geometry characteristics and the particular tap locations on the roof, a method commonly used in wind load simulations for high-rise and flat roof structures, is shown to not be appropriate for large-span cantilevered roof structures. This quasi-steady approach cannot be employed to evaluate large-span roof structures. © 2016 World Scientific Publishing Company. Source

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