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Li J.-J.,Tongji University | Li J.-J.,Shanghai Jianke Project Management Co. | Huang M.-S.,Tongji University | Wang W.-D.,East China Architectural Design and Research Institute | Chen Z.,East China Electric Power Design Institute
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

Determination of the ultimate bearing capacity of an uplift pile under deep excavation has been paid much attention to by more and more geotechnical engineers. The theoretical analysis of this problem becomes a hot research topic recently. Unfortunately, due to the limitation of in-situ test conditions, it is almost impossible to obtain the ultimate uplift capacity of tension piles under deep excavation from field tests. Accordingly, centrifuge model tests on uplift piles under deep excavation are performed to examine the load transfer characters and the ultimate bearing capacity. The variation of displacement, friction resistance and internal axial force of the uplift piles before and after deep excavation is analyzed. And then the centrifugal model tests results are used to verify the rationality of the FEM and the limit equilibrium method. The calculated results by the two theoretical methods have good agreement with the results of centrifugal model tests. Source

Feng P.,Tsinghua University | Hu L.,Tsinghua University | Qian P.,East China Architectural Design and Research Institute | Ye L.,Tsinghua University
Composite Structures | Year: 2016

Combining Al (namely, aluminum alloy) and CFRP (carbon-fiber-reinforced polymer) jackets to form structural members can yield many advantages and a bilinear behavior, which can enhance their advantages and mitigate any disadvantages. CFRP-Al hybrid tubes, which are used as axial load members in spatial structures, are investigated in this study by using compression experiments and a theoretical analysis. Formulas that describe the compressive bearing capacity with and without local buckling before yielding are proposed for stub hybrid tubes. In addition, their compressive behaviors are simulated by using the finite element method (FEM). A good agreement in the test results is achieved. The effect of the number of pairs of CFRP layers, the diameter-thickness ratio (DT ratio) and width-thickness ratio (WT ratio), and the fiber direction are described based on finite element analysis (FEA). Finally, a design approach for compressive CFRP-Al hybrid stub tubes is proposed. © 2016 Elsevier Ltd. Source

Chang L.,Tongji University | Zhang X.,Tongji University | Cai Y.,East China Architectural Design and Research Institute
Building and Environment | Year: 2016

When persons open the door and enter the main control room of a nuclear power plant, toxic or radiological contaminants in the surrounding area can potentially be carried into the room, which will damage the personnel safety. However, an assumed amount of inleakage is adopted in habitability analysis, without further verification. Therefore, this paper aims to investigate the actual inleakage caused by a person entering the control room. In order to determine the exact inleakage volume, full-scale experiments with a real person were performed in an inner-outer rooms model. The air in the outer room (the unfiltered air) was marked with tracer gas, so that the inleakage volume can be easily distinguished. The results showed a linear relationship between the inleakage and the door swing time (from 3 s to 8 s), from which the inleakage volume of 0.628-1.023 m3 was estimated for a single entry. We attributed the total inleakage to two parts: door pumping volume and person additional volume. The pumping volume was estimated at 0.65 m3 with little variation, while the person additional volume was affected by swing time markedly. These inleakage data would be important information for the evaluation of control room habitability. © 2016 Elsevier Ltd. Source

Zhang J.,East China Architectural Design and Research Institute
Asia Ascending: Age of the Sustainable Skyscraper City - A Collection of State-of-the-Art, Multi-Disciplinary Papers on Tall Buildings and Sustainable Cities, Proc. of the CTBUH 9th World Congress | Year: 2012

Modern supertall buildings have become one of the vital icons in economic development and urbanization progress in mainland China as well as one of the major focuses in China's construction industry. This paper will review the context of modern supertall buildings rising in mainland China, comprehend developmental threads and stimuli, and analyze evolving advancements. These will have a guiding significance on the prediction and outlook of China's supertall future emerging trends. Source

Jiang X.-F.,East China Architectural Design and Research Institute | Jiang X.-F.,Tongji University | Chen Y.-Y.,Tongji University
Gongcheng Lixue/Engineering Mechanics | Year: 2010

Initial failure of local elements caused by accidental events may become a starting point of progressive collapse. Diferring from moment frames or bearing wall systems, the truss system widely used in public architectures with large-span is of low redundancy in nature. In order to raise its structural robustness, precise analysis and therefore valid design trategy shall be expected. As a case study, a steel truss roof is deeply investigated in this paper by numerical method, and the internal force redistribution after intial failure, dynamic effect and primay failure modes are studied. By post-intinial failure analysis, it is found there are three kinds of redistributary mechanisms for truss structure: rotation pin mechanism, sliding surface mechanism and long column mechanism. The concept of sensitive element and key element is conceived according to simplified mathematic models, which provides a simple measure to evulate the safety performance for such structural system. Source

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