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Yang L.,Tongji University | Yang L.,Shanghai Xian Dai Architectural Design Group Co. | Wei S.,Tongji University | Zhang Q.,Tongji University
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2013

Compared with steel structures, aluminum structures have the advantages such as light weight, resistance to corrosion and easy extrusion process, etc. Due to these advantages, more and more attention was attracted and their applications are getting wider in the field of building engineering. The material properties of steel and aluminum were compared as load-bearing structural materials. Then a large number of representative aluminum reticulated spatial structures in China and abroad were bringing together and briefly introduced. A broad state of the art review of aluminum reticulated spatial structures was presented, including aluminum single and double layered reticulated shells and double-layer grids, both domestic and abroad. The major inadequacies were pointed out from the present experimental and theoretical study and structural design status at the same time. Several key issues to be further explored in the research and application of aluminum reticulated spatial structures were identified and discussed: the effect of joint stiffness and member initial imperfections on the overall stability of aluminum single-layer latticed shells; new joint systems; the dynamic response of aluminum reticulated spatial structures when subjected to the earthquake and the structural behavior when exposed to fire conditions. Source

Lin F.,Tongji University | Song X.,Tongji University | Gu X.,Tongji University | Peng B.,University of Shanghai for Science and Technology | Yang L.,Shanghai Xian Dai Architectural Design Group Co.
Construction and Building Materials | Year: 2012

This paper presents the results of a study on the cracking behaviour of young reinforced concrete walls with cracking control techniques. Material property tests were conducted to identify the time-dependent mechanical properties of the young concrete. A 1:4 scaled young reinforced concrete wall was tested up to 165 days to identify the strain development of the concrete and reinforcing bars. A three-dimensional finite element model was developed and verified with consideration of concrete shrinkage, creep, cement hydration heat and variation of temperature. The model was used for cracking analysis of massive reinforced young concrete walls of a synchrotron radiation facility to identify the influence of concrete joints, construction sequence, concrete curing and external restraints. It was found that the concrete cracking can be mitigated by the proper use of concrete joints, a reasonable construction sequence, early age concrete curing and a loose external restraint. © 2012 Elsevier Ltd. All rights reserved. Source

Li M.-S.,Shanghai Yuan Enterprise Management Consulting Co. | Li J.-J.,Shanghai Xian Dai Architectural Design Group Co. | Liu W.-Y.,Shanghai Yuan Enterprise Management Consulting Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

The CMC hydrostatic pressure relief technology is a new technology of hydrostatic pressure relief layer recently. It can resolve the problem of floating resistance economically and effectively. The principle and design method of the CMC hydrostatic pressure relief technology is introduced. A new method for floating resistance in soft soil areas is provided. Source

Lu D.,Shanghai Xian Dai Architectural Design Group Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2012

In most cases of wind-induced aeroelastic analysis of high-rise buildings using a loosely coupled method, convergence difficulties and errors often occur due to the distortion of the continuity and coordination of deformation of the simple structural finite element models which usually have fewer nodal points than the outer mold surface defined by the fluid mesh. The deformation method of high-rise buildings is presented based on the free form deformation principle. Under the premise without changing the number and topology of the grid on the building surface, the high order continuous deformation of the large amount of fluid mesh using the information of a small amount of structural mesh deformation are achieved, by taking the structural nodal points as the control points. The validity and effectiveness of this method, which may model continuous curvature and complex torsion of high-rise buildings, are confirmed through an example and comparing with results from wind tunnel test and other published papers. Source

Wang D.,East China Architectural Design and Research Institute Co. | Lu D.,Shanghai Xian Dai Architectural Design Group Co. | Li C.,Shanghai Xian Dai Architectural Design Group Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2010

With the wind speed time history as the wind tunnel boundary conditions, the wind load time history on membrane structure of the Expo Axis was obtained by using unsteady state calculation. The precision of the unsteady state simulation was verified by comparison of the mean wind pressure using steady state calculation and the statistical average of the wind load time history. Analytical results indicate that the unsteady state simulation can take the spatial distribution of the fluctuating wind load into account. The wind loads from CFD simulation are directly acted on the FEM nodes to calculate the dynamic responses in time domain. The results show that the method can take spatial-temporal correlation of wind and higher modes influence into account. Therefore, wind-induced vibration can be described more accurately. Source

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