East China Architectural Design and Research Institute

Shanghai, China

East China Architectural Design and Research Institute

Shanghai, China
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Ng C.W.W.,Hong Kong University of Science and Technology | Liu G.B.,Tongji University | Li Q.,Hong Kong University of Science and Technology | Li Q.,East China Architectural Design and Research Institute
Canadian Geotechnical Journal | Year: 2013

The long-term performance of a metro tunnel is obviously a major concern for the authority and designers responsible for its construction, as excessive tunnel settlement would affect the serviceability and safety of the entire metro system. In this study, measured long-term settlement of the 16.4 km long tunnel of Shanghai Metro Line 1 from 1994 to 2007 (a period of 12.5 years) is reported and discussed. The tunnel settlement was continuous with time, and reached a maximum of 288 mm. To assist in the investigation of the mechanisms of long-term tunnel settlement, records of groundwater pumping and subsurface soil compression between 1985 and 2007 are analyzed. Four possible causes - namely, effects of tunnel construction, cyclic loading due to running trains, secondary compression of soft clay, and groundwater pumping in sandy aquifers - are investigated. From the measurements of subsurface soil compression, it is revealed that the observed large tunnel settlement was mainly caused by the compression of sandy Aquifer IV due to groundwater pumping. The measured compression of sandy Aquifer IV accounted for about 65% of the maximum tunnel settlement of Line 1. Soil yielding due to an increase in effective stress was induced by a significant decline in groundwater level. The observed continuing settlement of the tunnel over the 12.5 years was the result of secondary compression (creep), which is a common feature of Aquifer IV at various locations in Shanghai.


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.


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.


Wang H.-R.,East China Architectural Design and Research Institute | Wang W.-D.,East China Architectural Design and Research Institute | Xu Z.-H.,East China Architectural Design and Research Institute
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

A simplified analysis method is proposed by Shanghai Technical Code for Excavation Engineering to evaluate excavation-induced damage of buildings. However, this method can not consider the main factors which affect the deformation of excavations. The simplified calculation formula considering system stiffness, excavation depth, excavation width for the maximum ground surface settlement is deduced by normalizing FEM results. The ground surface settlement profile behind the embedded walls is also provided. The validity of the simplified method of ground surface settlement prediction for excavations retained by embedded walls is verified by calculating several case histories in Shanghai. The ground surface settlement profile is used as the simplified analysis method to evaluate excavation-induced impact on surrounding environment. An example shows that this simplified method is suitable for analyzing excavation-induced impact on surrounding environment.


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.


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.


Wang W.-D.,Tongji University | Wang W.-D.,East China Architectural Design and Research Institute | Li Y.-H.,Tongji University | Wu J.-B.,East China Architectural Design and Research Institute
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

Super long bored piles are friction piles; thus establishing the appropriate pile-soil interface shear model is the key to reasonable and effective simulation analyze the load-movement characteristics of the pile. According to working trait of the super long bored pile shaft friction (τ) with the increasing of pile-soil relative movement (w), τ-w relationships are divided into the hardening and the softening types. Furthermore, the mobilized patterns of the pile shaft friction are divided into three types: the full hardening mobilized pattern, full softening mobilized pattern and hardening-softening mixed mobilized pattern. Hardening type and softening type pile-soil interface shear models are established for super long bored pile. The pile-soil interface shear models are introduced into FEM software using subroutine FRIC of ABAQUS. Single pile simulation example shows that the interface shear models are implemented in ABAQUS successfully. FEM simulation of field test piles is carried out using the established pile-soil interface shear models. The simulation results are similar to the measured results. It is shown that the established pile-soil interface shear models and FEM simulation have the rationality and feasibility to calculate the load-movement behavior of super long bored pile.


Mu L.-L.,Tongji University | Huang M.-S.,Tongji University | Wang W.-D.,East China Architectural Design and Research Institute
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

A simplified method of numerical analysis is developed to estimate the settlement and load distribution of capped pile foundations subjected to ground movements induced by tunneling in layered soil based on a two-stage method. In this method, the Loganathan analytical solution is used to estimate the free-field ground movements induced by tunneling at the first stage. At the second stage, composing the ground movement to the pile, the vertical movements governing equilibrium equations of piles are solved by finite difference method. The interactions between structural members, pile-soil, pile-raft, raft-soil and pile-pile interactions are modeled by means of the method in layered elastic half space though in case study there's no need to consider the raft-soil interaction. The validity of the proposed method is verified through comparisons with centrifuge tests, some published solutions for a single pile, pile groups and pile rafts subjected to ground movements induced by tunneling. Good agreements between these solutions are demonstrated. Responses of passive piles in layered soils and reduction of pile-soil interaction by pile deformation are analyzed.


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.


Wang W.-D.,East China Architectural Design and Research Institute | Wang H.-R.,East China Architectural Design and Research Institute | Xu Z.-H.,East China Architectural Design and Research Institute
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

Numerical analysis has become the most important method for analyzing and predicting the deformation of excavations in close proximity to sensitive properties. One of the key problems in a numerical analysis is to select proper soil constitutive models and their corresponding parameters. HS-Small model including HS model parameters and small strain parameters is suitable for numerical analysis of deep excavations because HS-Small model can not only reflect shear and compression hardening but also account for shear modulus attenuating with strain in tiny strain range. However, it is difficult to obtain the whole set of parameters of HS-Small model. Parameters of HS model which determined by soil tests are firstly checked through numerical analysis of five excavation histories in Shanghai area. Determination of some parameters of HS-Small model is then modified based on parameter sensitivity analysis. The most sensitive parameter is determined by back analysis of the field measurements of five case histories. Validity of the whole set of parameters of the HS-Small model is verified by numerical analysis of several typical excavations in Shanghai.

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