Xu Y.,Nanjing Southeast University |
Xu Z.,Nanjing Southeast University |
He T.,Lanzhou University of Technology |
Chen J.,Nanjing Southeast University |
And 3 more authors.
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2017
To investigate the generalized thermoelastic dynamic response of a sandwich plate subjected to symmetrical thermal shock, assuming that the value of thermal impedance at the interface is zero with ideal adhesion and the material properties change with the temperature, the governing equations of the layered plate with generalized thermoelasticity coupling are formulated based on the fractional order generalized thermoelasticity theory. The governing equations are solved based on Laplace transform and its numerical inversion, and the numerical values of the non-dimensional temperature, displacement, and stress are obtained. The effects of material parameters alteration including the thermal conductivity, density and heat capacity at the interface on the heat transfer and structure response are studied, and the effects of the fractional order parameter and temperature-dependent parameter are considered at the same time. The numerical results show that the values of temperature, displacement and stress increase with decreasing thermal conductivity, density and heat capacity at the interface. The fractional order parameter has a significant effect on temperature and stress, and a slight effect on displacement; the amplitudes of temperature, displacement, and stress decline with increasing temperature-dependent parameter. The decreases of thermal conductivity, density and heat capacity at the interface promote the heat transfer through the thickness direction of the plate, and the fractional-order theory and material temperature dependence have significant effects on the distributions of temperature, displacement, and stress are significant. © 2017, Editorial Department of Journal of Southeast University. All right reserved.
Xu Z.-D.,Nanjing Southeast University |
Xu C.,Nanjing Southeast University |
Hu J.,Nanjing Southeast University |
Hu J.,Jiangsu Provincial Architectural Design and Research Institute Ltd
JVC/Journal of Vibration and Control | Year: 2015
In this paper, tests on viscoelastic (VE) dampers are carried out, and the results indicate that VE dampers have high energy dissipation capacity and excellent anti-fatigue properties. To clarify the mechanical properties of VE dampers, a new mathematical model, named the equivalent fractional Kelvin model, which considers temperature and frequency effects simultaneously, is proposed. The numerical results using this model are in good agreement with experimental results. Then, through analysis on a five-story reinforced concrete frame structure with and without VE dampers, it is found that the seismic responses of the structure with VE dampers are significantly reduced and VE dampers have high energy dissipation capacity. © SAGE Publications.
Du D.,Nanjing University of Technology |
Wang S.,Nanjing University of Technology |
Liu W.,Nanjing University of Technology |
Jin R.,Jiangsu Provincial Architectural Design and Research Institute Ltd. Company |
Gong R.,Jiangsu Provincial Architectural Design and Research Institute Ltd. Company
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2011
The application of the performance-based seismic design of tall buildings beyond the code-specification was investigated by applying the method into the design of the North tower of the Sunning Plaza in Wuxi, Jiangsu province. In addition, the method can change the seismic design from one macroscopical goal into specific multi objectives. Performance levels and performance goals of tall buildings beyond the code-specification under different earthquake intensities were established. The standard model of North tower was created and analyzed using PERFORM-3D. The analysis result was the used to determine if the performance goal was achieved. The result shows that the response of North tower can meet the requirement of the code for seismic design buildings of China and the performance goal. The application of the performance-based design method is a beneficial reference for the seismic design of tall buildings beyond the code-specification.
Tao J.-H.,Nanjing Southeast University |
Tao J.-H.,Jiangsu Provincial Architectural Design and Research Institute Co. |
Liang S.-T.,Nanjing Southeast University |
Fan Y.-W.,Jiangsu East China Geological Construction |
And 2 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012
The composite foundation with plain concrete piles is applied in the construction of a high-rise building. Various in-situ loading tests and stress tests of piles and soil are performed after excavation of foundation pits. The settlement and stress variations of the composite foundation are monitored during the construction period. Based on the test data, the work mechanism, load sharing characteristics of composite foundation, stress distribution of the piles, and settlement characteristics of the foundation are analyzed. Moreover, the effects of post-grouting technology of the piles on the work performances of the composite foundation are evaluated. The test results indicate that the composite foundation with plain concrete piles exhibits high bearing and small deformation capacities. The reinforcement without soil compaction technology has a reinforcing effect on the soil among piles. The application of post-grouting technology can improve the bearing capacity and reduce the settlement of the composite foundation, and high loading level may result in better reinforcing effects. The rigidities of the foundation slab and upper structure provide certain adjustment for non-uniform loads on piles. As a result, a variable rigidity design method based on the distribution of load and foundation pressure is proposed.
Gong Q.,Nanjing Southeast University |
Zhu Q.,Nanjing Southeast University |
Zhu Q.,Jiangsu Provincial Architectural Design and Research Institute Ltd. |
Liang S.,Nanjing Southeast University |
And 2 more authors.
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2013
To study the effects of thickness, rib width and steel ratio on punching shear capacity, nine hollow slab-column connection members were tested under punching shear force and the experimental data such as cracking load, ultimate load, vertical displacement, and steel and concrete strain were obtained. By data analysis and theoretical analysis, the effects of thickness, diameter, rib width and steel ratio on punching shear capacity were analyzed. The experimental results show that the failure mode of the hollow slab-column connection is fragile failure. The crack firstly takes place between the slab edge perpendicular to tube direction and the column side at the bottom of slab. The cutting angle along the tube direction ranges from 50° to 60° which is larger than that perpendicular to tube direction ranging from 30° to 45°. The increase of the thickness, rib width and steel ratio can improve the punching shear capacity.