Luan S.,Harbin Institute of Technology |
Wang F.,Harbin Institute of Technology |
Shui W.,Shanghai Xiandai Architectural Design Group Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014
The study of effective depth of high energy dynamic compaction on sticky/sandy/gravel backfilled residual soil is based on the field test results of three large-scale projects. Effective depth of different high energy level dynamic compaction on three different backfilled residual soil and the relationship of them were determined based on bearing capacity and compression modulus before and after compaction which were determined by in-situ testing method such as load test, standard penetration test, dynamic penetration test, etc. Results indicate that under the same energy level of dynamic compaction, the higher the residual soil backfill ground gravel content is, the deeper the effective reinforcement depth becomes. Suggested formula of effective depth which soil nature and the energy level taken into account was obtained. Results also indicate that the recommended value in Chinese code is lower than the calculated value of the suggested formula.
Yang L.,Tongji University |
Yang L.,Shanghai Xiandai 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.
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.
Li C.,Shanghai Xian Dai Architectural Design Group Co. |
Lu D.,Shanghai Xian Dai Architectural Design Group Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2011
The grid quality standards of single-layer lattice shells are different from that of the FEM grid in that the former emphasizes more on qualitative demands. It is desired to have identical element length, well-distributed grids, and fluent lines. After the free-form surface shape optimization was carried out, intelligent grid design programs were devised based on mesh shape and element length standard. In the process of layout design, the space problem must firstly be turned into plane problem using topological invariant principle, then the grids should be mapped back onto the 3-D surface from the reference field. By intelligent correction and optimization of the initial grids on the 3-D surface, well-distributed grids will be obtained. The validity and practicability of this method are discussed for Sun Valley of Shanghai EXPO axis. It reveals that the same efficiency will be achieved using different topological grids, for designer's reference. The method was proved to be simple and effective.
Li J.,Hefei University of Technology |
Li Z.,Hefei University of Technology |
Zeng J.,Shanghai Xian Dai Architectural Design Group Co.
Advanced Materials Research | Year: 2014
This paper chose two commercial and cultural blocks as the study objects to do walking experiments with GPS, namely Hefei Jindadi 1912 and Nanjing 1912, and collected 134 groups of behavior tracks information. The analysis on the two blocks space with typology method could compare and analyze the different characteristics of the four kind space forms. And author counted the data for the tourist behavior scope and walking distance to summer up the better characteristics of high utilization rate of nodes. The walking experiments with GPS put forward improvement suggestions for the existing space in the design of commercial and cultural blocks to make humanized atmosphere for the commercial and cultural blocks. © (2014) Trans Tech Publications, Switzerland.
Lu D.,Shanghai Xian Dai Architectural Design Group Co. |
Li C.-M.,Shanghai Xian Dai Architectural Design Group Co.
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | Year: 2013
A mesh update scheme on the basis of computer graphics principle of free-form deformation (FFD) was introduced for loosely fluid-solid coupling to address issues such as the difference of element type and amount, the mesh deformation without coordination, the convergence difficulties and the calculation errors. The higher order and continuous deformation of fluid mesh was implemented by embedding spatial deformation method based on FFD. The deformation of fluid meshes was controlled by structure grids which usually have fewer number than the outer mold surface defined by the fluid mesh. The effect of turbulent flow boundary conditions was taken into account. Comparison was carried out with FFD method and the partitioned interpolation method. The aerodynamic damping characteristics were also analyzed. It is found that FFD method implements the high-rise building's arbitrarily complex continuous lateral bending and torsion, and the problem of the complicated architectural shape can also be solved with good convergence and high precision. The numerical results acquired by the study well accorded with those of wind tunnel test.
Yue J.-Y.,Shanghai Xiandai Architectural Design Group Co. |
Yao J.,Shanghai Xiandai Architectural Design Group Co. |
Huang S.-M.,Shanghai Xiandai Architectural Design Group Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011
Based on the successful engineering practice for the underground garage of a hospital in Shanghai, the design and practice for the underground garage under the congested urban housing environment in Shanghai soft soil area are presented. The garage is close to nine existing buildings including two historical buildings whose protection requirements are extremely high. According to the characteristics of the project, the temporary retaining and bracing system combined with the substructure of the underground garage and the top-down construction method are adopted. Precast diaphragm walls first applied in two-storey underground garage in Shanghai soft soil are used as the temporary retaining wall combined with the exterior wall of the garage. In order to reduce the settlement of buildings caused by deep excavation, protective measures including shut-off screens between the retaining wall and the existing buildings and the pile underpinning technique for the foundation of the existing buildings are applied. The practice shows that the settlement of the buildings meets the requirements through adopting the above-mentioned technical measures, and the safety of the surrounding environment is ensured. This project provides a reference for other similar underground space development projects in Shanghai area.
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.
Liu L.,Beijing Jiaotong University |
Li X.M.,Beijing Jiaotong University |
Tian W.,Shanghai XianDai Architectural Design Group Co.
Applied Mechanics and Materials | Year: 2014
Friction Pendulum Systems have been used as base isolation systems for both new construction and retrofit around the world. This paper presented its implementation in an office building located in Shanghai. To evaluate its impact on seismic performance of the retrofitted structure, models are needed to capture the intricate nonlinear behavior of both structural components and isolator elements. Nonlinear time history analysis of the building for the original and retrofitted cases was conducted to assess the efficiency of the isolation system at the high earthquake level. The numerical results indicate that the retrofitted structure experiences significantly less damage and less deformation due to the shake isolation and energy dissipation through the isolators. © (2014) Trans Tech Publications, Switzerland.
Wang D.,East China Architectural Design and Research Institute Co. |
Lu D.,Shanghai Xiandai Architectural Design Group Co. |
Li C.,Shanghai Xiandai 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.