Tongji Architectural Design Group Co.

Shanghai, China

Tongji Architectural Design Group Co.

Shanghai, China

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Chen J.,Tongji University | Yang R.,Tongji Architectural Design Group Co. | Zhao Y.,Tongji University
Structural Design of Tall and Special Buildings | Year: 2017

Large wind turbine system is a periodic time-varying system with many rigid-flexible coupling bodies. It is difficult to deal with the singular stiffness matrix produced by the rotation of blades via the traditional finite element method. However, the vector form intrinsic finite element (VFIFE) method can effectively solve the geometric deformation of elastic continuum, the nonlinear or discrete constitutive model, the coupling motion continuum, and rigid body. In this study, a solver program of space beam element is developed by VFIFE method, and three typical examples are chosen to verify its accuracy. And then the integrated simulation of wind turbine system is established, and its dynamic response is analyzed. The natural frequencies of the turbine system, which are obtained by modal parameter identification, can agree well with the results obtained by traditional finite element method. The weighted amplitude wave superposition method and the proper orthogonal decomposition method as well as B-spline surface interpolation are employed to obtain the wind time series of wind turbine under the normal operation condition. The wind-induced dynamic response of wind turbine system is calculated by VFIFE method. The numerical results can reflect the periodic influence of gravity on the internal forces of blades and the interaction between blades and the tower. Copyright © 2017 John Wiley & Sons, Ltd.


Cheng C.,Tongji University | Zhou D.,Tongji University | Wang B.,Tongji Architectural Design Group CO.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2017

On the basis of tests for sixteen different specimens of composite concrete and double-steel plate shear walls with binding bars, the failure modes of specimens with different aspect ratios, axial compression ratios and distances between binding bars were observed, and some valuable results were obtained for the specimens' hysteretic loops, force-bearing capacity, skeleton curves and displacement ductility.The tested specimens' aseismic parameters were compared with those of the traditional reinforced concrete walls using numerical analysis. The results indicated that the composite shear walls have better aseismic performances. Simultaneously the elastic-plastic time history analyses under different earthquake levels were conducted for both composite shear wall structural systems and traditional reinforced concrete shear wall systems with ABAQUS to compare their drift ratio and components' plastic energy dissipation. The results demonstrated that the composite shear wall systems' drift ratio and plastic energy dissipation are significantly reduced, and the energy dissipation capability of connected beams increases; the aseismic behavior of composite shear wall structure systems is better than that of traditional shear wall systems. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.


Yao W.,Tianjin Chengjian University | Li Z.,Tongji University | Zhao Q.,Tongji University | Lu Y.,Tongji Architectural Design Group Co. | Lu R.,Tongji University
Energy Conversion and Management | Year: 2015

Through the analysis of distribution of diffuse radiation in the sky, the sky diffuse radiation is divided into four zones. Based on the concept of radiation intensity and solid angle, the corresponding integral equation is established in each zone to build a new theoretical model of anisotropic diffuse radiation. Radiation enhancement coefficients in the new theoretical model are solved from the instantaneous diffuse radiation data received by 30°, 45°, 60° inclined planes, then new model and existing models are compared with the diffuse radiation data received by 90° inclined planes. The results demonstrate that for existing models, Perez model is the most accurate, followed by Liu and Jordan model. Among the second generation models, Klucher model, Hay model, Skartveit and Olseth model are relatively accurate. While compared with existing models, NADR model is more consistent with the measured values. Further comparative analysis shows that for east and north orientations, Perez model and NADR model are more accurate; for south and west orientations, Liu and Jordan model and NADR model are more accurate. Klucher model is well agreed with the measured data in different inclinations. Hay model and Skartveit and Olseth model are relatively accurate on 30° tilt surface, and Temps and Coulson model is also relatively accurate on 45° tilt surface. NADR model is in good agreement with the measured data on 60° and 90° tilt surface. On the whole, NADR model is more accurate than the existing models. © 2015 Elsevier Ltd. All rights reserved.


Jiang H.,Tongji University | Wang Y.,Tongji Architectural Design Group Co.
Journal of Asian Architecture and Building Engineering | Year: 2016

A modified macro numerical model for coupled RC shear/core walls is proposed to better consider the deformation compatibility between the coupling beam and the wall element and to incorporate the out-of-plane effect of the wall panel. In this model, the three-dimensional macro shear wall element model with distributed shear springs and out-of-plane freedom is adopted to simulate the wall unit; a one-dimensional line element consisting of three sub-units in series based on the vertical deformation compatibility is adopted to simulate the coupling beam. The case study shows that a numerical model based on the vertical deformation compatibility results in more accurate simulation of the mechanical behavior of the RC coupled shear wall. The modified model developed in this study has the advantages of fast calculation and high precision, which makes the model appropriate for engineering application. © 2016, Architectural Institute of Japan. All rights reserved.


Yan S.,Tongji University | Jin L.,Tongji University | Zhang Z.,Tongji Architectural Design GROUP CO. | Zhang W.,Tongji University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

Recent interest in line-tracking methods using UAV has been introduced in the research of pattern recognition and diagnosis of transmission system. A fault diagnosis method for transmission line based on Scale Invariant Feature Transform (SIFT) is proposed in this paper, which recognizes fault images by comparing aerial images with model images. The reliability and efficiency of the system is effectively improved by pro-calculating local scale-invariant features of models. The research can provide a new method for predictive maintenance of the transmission line. © 2013 Springer-Verlag Berlin Heidelberg.


Jiang H.,Tongji University | Wang Y.,Tongji Architectural Design Group Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2016

The connection between the coupling beam and wall pier in existing macro numerical models for coupled RC shear walls adopts the horizontal deformation compatibility, namely, the rotation at the end of the coupling beam coincides with the rotation of the horizontal rigid beam of the wall element. However, the horizontal deformation compatibility cannot reflect the actual deformation compatibility condition between the coupling beam and the wall pier. To this end, a macro numerical model for coupled RC shear wall is proposed. In this model, the three-dimensional macro shear wall element model (TMSEM) with distributed shear spring and out of plane degree of freedom is adopted to simulate the wall pier, and the one-dimensional line element consisting of three sub-units in series is adopted to simulate the coupling beam. The connection between the coupling beam and the wall pier adopts the vertical deformation compatibility, namely, the rotation at the end of the coupling beam coincides with the rotation of the outer vertical line of the TMSEM. In order to assess the accuracy of this simulation, verification case studies are provided and the results show that the numerical model based on the vertical deformation compatibility results in more accurate simulation of the mechanical behavior of the RC coupled shear wall. The macro numerical model for coupled RC shear walls developed in this study can be used for three-dimensional nonlinear analysis. The wall element can better simulate the shear deformation and the out-of-plane deformation, and the coupling beam element can better simulate the actual deformation compatibility with the wall pier. © 2016, Editorial Office of Journal of Building Structures. All right reserved.


Zhao X.,Tongji Architectural Design Group Co. | Fang S.,Tongji University
Advanced Materials Research | Year: 2013

Many super tall buildings are built up in China in recent years. The concept of low carbon based design has aroused much focus nowadays. There are few researches that combine structural design of super tall buildings with life cycle based low carbon design. Due to its huge quantity material and energy assumption, the super tall buildings exert great impact on the environment. In this study, an innovative new life cycle model is proposed for assess and optimize the life cycle environmental cost of super tall buildings, in which the space distribution of the building materials is considered besides the time dimension. A benchmark super tall building is established in this study to illustrate the application of the proposed new life cycle model. According to the case study results, a conclusion is drawn that a remarkable difference would be made in carbon emissions if low carbon based structural design method could be applied. © (2013) Trans Tech Publications, Switzerland.


Ding J.,Tongji Architectural Design Group Co. | Wu H.,Tongji Architectural Design Group Co. | Zhao X.,Tongji Architectural Design Group Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

In China, super high-rise buildings have got rapid development by far, which spread from Yantze River delta and Pearl River delta to other regions. More notably, in circum-Bohai-Sea region and some second-tier cities, super high-rise buildings show much more significant progress. For buildings with different heights, the frame-core tube, framed tube-core tube, mega frame-core tube and mega frame-core tube-mega brace are commonly adopted. With the increase of height, mega frame and mega brace have more application. Composite structure is the main structural system for super high-rise buildings. Through construction cost of collected projects, the influences of height, seismic intensity and structural material on cost of installation and civil engineering are analyzed. Issues of structural design and analysis, such as aerodynamics modification for wind-resistant and structural response on long-period seismic action, are illustrated. With the aim of reducing seismic response, viscous damper is widely used as a energy-dissipated measure. Therefore, the application and prospect of viscous damper on super high-rise buildings are presented at last.


Wu H.,Tongji Architectural Design Group Co. | Ding J.,Tongji Architectural Design Group Co. | Cui J.,Tongji Architectural Design Group Co. | Zhang B.,China CMCU Engineering Corporation
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

In frame-core wall structural system, the outriggers and belt members can significantly improve the lateral structural stiffness and decrease the lateral deflection. However they will bring adverse effects such as abrupt change of structural stiffness and internal force. Based on one super high-rise building, the damping effect of viscous dampers in the outrigger was analyzed under frequent and rare earthquakes. The optimal position and efficiency of damper belt truss in super high-rise building were analyzed. The results show that viscous dampers in outrigger can reduce the plastic damage to the core wall and reduce the dynamic response of the structure. It is appropriate to place damper belt truss in the story where relative velocity is large. Efficiency of damper belt truss decreases with the increasing of structure height. The connections between the outrigger and the frame column as well as core tube were analyzed and suggestions are given on connection design.


Li X.,Tongji Architectural Design Group Co.
Journal of Earthquake Engineering and Engineering Vibration | Year: 2014

Earthquake action is often a major factor of bridge design controlling for large span concrete continuous girder bridge in high seismic risk zone. It is a vexed question for engineers to choose a reasonable seismic isolation design. A three span continuous girder bridge (3 ×30m) in Quan Zhou is analyzed in this paper. Finite element model is built with double spherical aseismic bearing, lead rubber bearing (LRB) and cable-sliding friction aseismic bearing (CSFAB) respectively. The isolation effect of different bearings is studied by nonlinear time history analysis. Results indicate that, CSFAB can not only reduce the internal force at the bottom of the pier, but also have great advantages in controlling the relative displacement between girder and pier. Thus CSFAB is adequate to meet the demands of structural seismic performance.

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