East China Architectural Design & Research Institute Co.

Shanghai, China

East China Architectural Design & Research Institute Co.

Shanghai, China
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Shi G.,Tsinghua University | Zhu X.,East China Architectural Design & Research Institute Co.
Gongcheng Lixue/Engineering Mechanics | Year: 2017

The constitutive model of steel under monotonic loading is the basis for structure analysis. In order to calculate the response of high-strength steel structures and to analyze the member behaviour more accurately and to give some references to engineers when applying high-strength steel, this paper updated the parameters of the multi-linear constitutive model of high-strength steel and presented a nonlinear constitutive model based on the Ramberg-Osgood model by means of summarizing the experiment results and by carrying out lots of tensile tests. It has been proved that a nonlinear constitutive model could simulate the stress-strain relationship of high-strength steel under monotonic loading well by comparison with the experiment data. Moreover, to give a consideration to both accuracy and efficiency, a revised multi-linear constitutive model is proposed, which could present the nonlinear material property of high-strength steel and show the similarity in the meantime. © 2017, Engineering Mechanics Press. All right reserved.


Zhang X.,East China Architectural Design & Research Institute Co.
Engineering Science and Technology, an International Journal | Year: 2017

More and more high rising buildings emerged in modern cities, but emergency evacuation of tall buildings has been a worldwide difficult problem. In this paper, a new evacuation device for high rising buildings in fire accident was proposed and studied. This device mainly consisted of special spiral slideway and shunt valve. People in this device could fast slide down to the first floor under gravity without any electric power and physical strength, which is suitable for various emergency evacuation including mobility-impaired persons. The plane simulation test has shown that human being in alternative clockwise and counterclockwise movement will not become dizzy. The evacuated people should wear protection pad, which can prevent slider from being injured by surface friction with the slide, and eliminate the friction coefficient difference caused by different clothes and slide surface. The calculation results show that the evacuation speed of the new device is much faster than traditional staircases. Moreover, such new evacuation device can also be used as a means of vertical transportation in high-rise buildings partly. People can take it from any floor to ground floor directly, which not only save time for waiting for the lifts but also save the power. The new evacuation system is of simple structure, easy to use, and suitable for evacuation and partly used as vertical downwards traffic, which shows light on solving world-wide difficulties on fast evacuation in high-rise buildings. © 2017 Karabuk University


Yuan S.,East China Architectural Design & Research Institute Co. | Jiang H.,Tongji University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2017

The influence of different types of coupling beams on seismic performance of a frame-core tube structure was studied by modal analysis, response spectrum analysis and time-history analysis of two RC frame-core tube structures with different types of coupling beams under different levels of earthquake ground motions with the aid of the structural analysis software PERFORM-3D. The effects of the type of coupling beams on the seismic performance of the structure were analyzed by comparing the performance parameters such as the structural dynamic characteristics, displacement, and force responses of the structure, the dissipated energy and the structural damage of the structure under rare earthquake. The study indicates that the energy-dissipation capacity of different types of coupling beams is considerably different, and the type of coupling beams has significant effect on the overall seismic performance of the structure. The input seismic energy is mostly dissipated by the flexure-dominant coupling beams so that the core tube itself has dual seismic defense lines. The seismic performance of the structure with the flexure-dominating coupling beams is better than that of the structure with shear-dominating coupling beams. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.


Sun F.,Tongji University | Ran M.,Tongji University | Zhou J.,East China Architectural Design & Research Institute Co. | Huang J.,Tongji University | And 3 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2017

In the exterior frame of a super high-rise building, an inclined column and a side column, both being concrete-filled steel tubular columns, intersect with a small angle of 12° to form a huge joint with a height over six stories, and the joint is also connected with six floor beams. Unbalanced axial force exists in the side column over the joint, resulting in unfavorable shear load along the crossover joint. The inclined column is subjected to extremely large axial force. In order to validate its load transfer mechanism, a large-scale test on the joint was conducted in four stages considering the most unfavorable load combination of 1.2 times gravity load and 1.3 times design earthquake action. The test result shows that: in the first stage with design load, the specimen remains in elastic state; secondly, a large increase of unbalanced axial force in the side column has some influence on in-plane lateral displacement and little effect on out-of-plane lateral displacement; thirdly, the specimen remains safe during transition from compression-shear load to tension-shear load through unloading the axial load on the inclined column; lastly the specimen reaches its load carrying capacity which is over twice the design load, and the failure mode exhibits local bulge at both ends of the inclined column due to buckling under compression. There is no obvious deformation within the joint region up to failure, indicating that the design of the crossover joint satisfies the 'strong-joint-weak-member' requirement of Chinese design code. Interior vertical stiffeners and interior steel rings make the steel tubes and concrete work together, preventing obvious shear failure in the joint in the whole process. A 3-D nonlinear finite element model was developed to simulate the mechanical behavior of the crossover joint. The load-deformation curves and failure mode predicted by finite element analyses show good agreement with those of the experiment. © 2017, Editorial Office of Journal of Building Structures. All right reserved.


Shi G.,Tsinghua University | Zhu X.,East China Architectural Design & Research Institute Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2016

In the current Chinese steel structure design codes, there is only the design value for Q345 GJ steel. In order to complete the design values of other grades of GJ steel (mainly Q390GJ, Q420GJ and Q460GJ steels), this paper analyzes the reliability of domestic steel plates for building structures. Based on the statistical research on the material properties of Q390 GJ, Q420 GJ and Q460 GJ steels and the researches on the uncertainties of geometrical parameters and models of steel structures, the statistical parameters of GJ steel resistance uncertainty were calculated. Utilizing the check-point method, the partial factors for resistance of GJ steel under different load combinations were then obtained. Varying patterns of the partial factors for resistance were also analyzed. After comparisons and trials, this paper has suggested the partial factors for resistance and design values of strength of GJ steel under different circumstances. The reliability of the above design values was calibrated. The result shows that, the design values which are suggested in this paper satisfy the demands in the Unified standard for reliability design of engineering structures (GB 50153-2008) and have sufficient reliability. © 2016, Science Press. All right reserved.


Zhou Y.,Tongji University | Miao C.,Tongji University | Yan F.,East China Architectural Design & Research Institute Co. | Liu Q.,East China Architectural Design & Research Institute Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2015

Coupled shear walls with steel reinforced concrete (SRC) coupling beams have recently been applied in practical projects. Nonetheless, no clear requirement is specified in current codes on key parameters such as steel ratio of this technology. This research performed cyclic loading tests on coupled shear walls using SRC coupling beams with variable steel ratio. Finite element analysis with software of ABAQUS and variable parametric analysis were further conducted. The results of experiments and finite element analysis show that better failure mode and higher deformability, energy dissipation capacity and ultimate horizontal bearing capacity of shear walls with SRC coupling beams can be observed than those of shear walls with reinforced concrete (RC) coupling beams. And from the results of finite element analysis with ABAQUS, it can be concluded that the optimal steel ratio in the beams ranges from 4% to 8% and the web area of the steel should be increased. ©, 2015, Science Press. All right reserved.


Zhang Y.,Tongji University | Wu J.-B.,East China Architectural Design & Research Institute Co. | Cai Y.-C.,Tongji University
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

Geddes's method is widely applied to estimate the settlement of pile group in China with its simple principle and easy realization. However, Geddes's method has its own obvious shortcomings. The influence of pile diameter is not considered in Geddes's method which can produce great stress concentration on the pile tip. Moreover, the distribution of shaft resistance of long piles under vertical working load is quite different from the suggested one of Geddes's method. In order to solve these problems, based on Geddes's method, a modified assumptions is presented, i.e. the end resistance uniformly distribute on the pile tip and the shaft resistance distributes on the side surface of the pile. Mathematical integration and Gauss integration are applied to estimate additional stress in the soil, which can significantly decrease the influence of stress concentration. Meanwhile, calculation formula of additional stress in the soil of bilinear distribution pattern is deduced by the combination of Geddes's method. Case studies show that the settlement predicted by modified Geddes's method is smaller than that predicted by Geddes's method. ©, 2015, Academia Sinica. All right reserved.


Hou S.-N.,East China Architectural Design & Research Institute Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

Based on the horizontal static load tests on 57 single-piles of 12 sites in Shanghai, the bearing capacity of single pile under the action of horizontal load is studied. According to the test data, the effects of different pile diameters, and different loading methods and grouted pile stress characteristics of prestressed hollow are explored. For the architectural engineering, the larger pile diameter or the pile diameter enlarging top within a certain range are suggested to optimize the design of horizontal bearing capacity of singe pile. The loading test is suggested by the single cycle constant speed horizontal loading method; the safety of prestressed hollow core can be used as filling pile top horizontal bearing capacity. The study results will be useful for the design of lateral bearing capacity of single pile. ©, 2015, Academia Sinica. All right reserved.


Gao C.,East China Architectural Design & Research Institute Co. | An D.,East China Architectural Design & Research Institute Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2016

Theoretical and case studies were carried out for several outstanding issues in the engineering application of dissipative BRB. The main factors and technical parameters were discussed for the technology selection of this kind of BRB. The reasonable matching relationship between the yield capacity and axial rigidity of BRB, as well as the matching relationship between yield deformation and BRB's length were analyzed. The effective range of the two types of defined matching coefficients were given. The impact of BRB's yielding on the whole structural response index was analyzed. It was suggested that the possible structural performance degradation under rare earthquake be evaluated in the schematic design, and avoid considering the BRB's dual role of stiffness adjustment and energy consuming at the same time, or make the BRB reach yielding stage under design level earthquake. Through the calculation formula derivation of the additional damping ratio and the parametric analysis, the basic rule of the BRB's energy dissipation effect is clarified: the additional damping ratio is affected by both the structure itself and the BRB's parameters and the BRB's story shear ratio is the main controlling parameter. The additional damping ratio does not always increase with the increase of earthquake action, which has the maximum value corresponding to a seismic action. The problem about how to ensure the structure and BRB's safety in rare earthquake if the BRB reachs yielding stage from frequent earthquake is discussed, the deformation requirements in different systems and suggestions for devices improvement are given. The study results can provide theoretical reference for dissipative BRB's reasonable and efficient application in engineering. © 2016, Editorial Office of Journal of Building Structures. All right reserved.


Fang L.,East China Architectural Design & Research Institute Co. | Jin G.,Tongji University | Li J.,Tongji University | Wang Z.,Tongji University
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2015

Based on the experimental results of eleven T-shaped RC short columns subjected to axial load and reasonable assumptions, the core concrete in T-shaped cross sections was divided into several regions. The analytic derivation of the effective transverse confined pressure was provided, and the equivalent uniaxial constitutive relationship was constructed for core concrete of the divided regions. The load versus strain curves of the specimens were calculated by the proposed constitutive relationship. The calculated results agreed well with the experimental results. The effects of the stirrup spacing, diameter, and yield stress of transverse reinforcement on lateral confinement were investigated in T-shaped cross sections. The results show that the stirrup spacing, diameter and yield stress of transverse reinforcement has significant influence on the axial load versus strain curves. The axial load, peak strain, and strain ductility increase, compared with the condition without the lateral confinement of transverse reinforcement. © 2015, Science Press. All right reserved.

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