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Ye J.,Nanjing Southeast University | Pan J.,Nanjing Southeast University | Liu X.,Nanjing Southeast University | Liu X.,China Architecture Design and Research Group
Earthquake Engineering and Engineering Vibration | Year: 2011

Many studies have focused on horizontal ground motion, resulting in many coherency functions for horizontal ground motion while neglecting related problems arising from vertical ground motion. However, seismic events have demonstrated that the vertical components of ground motion sometimes govern the ultimate failure of structures. In this paper, a vertical coherency function model of spatial ground motion is proposed based on the Hao model and SMART 1 array records, and the validity of the model is demonstrated. The vertical coherency function model of spatial ground motion is also compared with the horizontal coherency function model, indicating that neither model exhibits isotropic characteristics. The value of the vertical coherency function has little correlation with that of the horizontal coherency function. However, the coherence of the vertical ground motion between a pair of stations decreases with their projection distance and the frequency of the ground motion. When the projection distance in the wave direction is greater than 800 meters, the coherency between the two points can be neglected. © 2011 Institute of Engineering Mechanics, China Earthquake Administration and Springer-Verlag Berlin Heidelberg.

Tong L.,Tongji University | Xu G.,Tongji University | Liu Y.,Hunan Provincial Architectural Design Institute | Yan D.,China Architecture Design and Research Group | Zhao X.-L.,Monash University
Thin-Walled Structures | Year: 2015

A diamond bird-beak T-joint is similar to a conventional T-joint except that the brace member and chord member both rotates 45°. Previous research demonstrated that the diamond bird-beak joint has better static and fatigue behaviour than a conventional joint. Experimental testing has been reported by the authors to determine the stress concentration factors (SCFs) of diamond bird-beak SHS T-joints. This paper fills the knowledge gap through FE analysis, parametric study and proposed SCF formulae for such joints. Three-dimensional finite element (FE) models were developed and validated by experimental data. The FE model was utilized for parametric study on SCFs for diamond bird-beak SHS T-joints to investigate the influence of key non-dimensional geometric parameters β (ratio of brace width to chord width), 2γ (ratio of chord width to chord thickness) and τ (ratio of brace thickness to chord thickness). Finally SCF formulae were proposed for diamond bird-beak SHS T-joints under four loading cases, namely axial force and in-plane bending in the brace, as well as axial force and in-plane bending in the chord. © 2014 Elsevier Ltd.

Yang S.-L.,China Architecture Design and Research Group | Diao B.,Beihang University
Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | Year: 2011

Ultra-high performance fiber reinforced concretes (UHPFRC) with compressive strength over 100 MPa were confected by using steel fibers, such as kink end type, flat end type and wavy type. Doped fiber volume ratios were 1.0%, 2.0%, 2.5% and 3.0% respectively. The influences of steel fiber shapes and doped volume ratios on the fluidity, compressive strength, flexural strength, fracture energy and bending toughness of UHPFRC were researched through cube compressive tests and beam flexural tests. Experiment result shows that when doped fiber volume ratios are from 1.0% to 2.5%, UHPFRC with flat end steel fiber has the best flexural strength, fracture energy and bending toughness. When doped fiber volume ratio is 3.0%, UHPFRC with kink end type steel fiber has the best flexural strength, fracture energy and bending thoughness. When doped fiber volume ratio is 2.0%, UHPFRC with flat end type steel fiber has the best construction performance and mechanical performances. When doped fiber volume ratios are from 1.0% to 3.0%, the compressive strength of UHPFRC with wavy type steel fiber is highest than the, but its flexural strength and fracture energy are lowest.

Nie J.,Tsinghua University | Zhu L.,Tsinghua University | Fan J.,Tsinghua University | Fan Z.,China Architecture Design and Research Group | Liu X.,China Architecture Design and Research Group
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2013

An experimental research was conducted on seismic behavior of steel plate shear walls, in order to support the design of the Tianjin International Financial Conference Hotel. Three model specimens of four story steel plate shear wall with 1:5 scale were tested under low-cycle reverse load. One specimen with wall panels with openings was designated as SPSW-1, the second one with wall panels without openings was designated as SPSW-2, and the third one with wall panels with openings and an interior column was designated as SPSW-3. [-shaped and-shaped stiffeners were attached to wall panels of specimens. The test results show that steel plate shear walls have good strength, ductility and energy dissipation capacity, and the strength and stiffness of steel plate shear walls can be obviously reduced due to openings and improved due to the interior column. Stiffeners can be used to reinforce the openings so that the stiffness and stability of steel plate shear walls can be significantly enhanced.

Li B.,Chongqing University | Yao R.,Chongqing University | Yao R.,University of Reading | Wang Q.,China Academy of Building Research | Pan Y.,China Architecture Design and Research Group
Energy and Buildings | Year: 2014

Designing for indoor thermal environmental conditions is one of the key elements in the energy efficient building design process. This paper introduces a development of the Chinese national Evaluation Standard for indoor thermal environments (Evaluation Standard). International standards including the ASHRAE55, ISO7730, DIN EN, and CIBSE Guide-A have been reviewed and referenced for the development of the Evaluation Standard. In addition, over 28,000 subjects participated in the field study from different climate zones in China and over 500 subjects have been involved in laboratory studies. The research findings reveal that there is a need to update the Chinese thermal comfort standard based on local climates and people's habitats. This paper introduces in detail the requirements for the thermal environment for heated and cooled buildings and free-running buildings in China. © 2014 Elsevier B.V.

Zheng X.,Tianjin University | You S.,Tianjin University | Yang J.,Tianjin University | Chen G.,China Architecture Design and Research Group
Energy and Buildings | Year: 2014

Seawater heat pump (SWHP) systems are considered as an ideal approach to heat and cool buildings in coastal areas due to its attractive advantages of high efficiency, low carbon emission and using renewable energy instead of electricity for heating and cooling. A great many of SWHP systems have been applied in residential and commercial buildings successfully. In this paper, models describing the coupled seepage and heat transfer process of beach well infiltration intake systems for a SWHP were established and validated by field experiment. In addition, the performance of the beach well infiltration intake system was simulated. And effect of the parameters related to the beach well and the operation of the system on pumping water temperature was explored through a series of simulations. As a result, application of SWHP systems with beach well infiltration intake system in coastal areas in China is feasible due to the favorable geographical conditions and environment. © 2013 Elsevier B.V. All rights reserved.

Lu Y.,China Architecture Design and Research Group | Xu L.,Beijing Jiaotong University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

A nonlinear seismic damage control strategy of tall building structures using MR dampers is proposed. The basic control equation based on central difference method is derived, the semi-active control platform is developed through the secondary development of LS-DYNA program, and the structure and the nonlinear semi-active control system integrated modeling, analysis and design are realized. Taking a 15-story steel frame-steel plate shear wall (SPSW) structure as example, the dynamic responses and damage process of the structures with and without MR dampers are analyzed, results indicate that the control platform is numerically stable with fast solution speed and high precise. The relative displacement, residual displacement and damage of each story are all significantly reduced, the damage distribution is more extender, and the global seismic performance is increased after MR damper is employed.

Fan Z.,China Architecture Design and Research Group | Yang S.,China Architecture Design and Research Group | Luan H.,China Architecture Design and Research Group
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2011

Based on the development of research on the design of spatial structure joints in China and other countries in recent years, the revision work of the National Standard, 'Code for design of steel structures' (GB 50017-2003) and the author's project practice, the paper comprehensively reviews the research progress of bolted spherical joint and welded spherical joint, intersecting round pipe and intersecting rectangular pipe joint, high strength bolted connection plate joint, cast steel joint, spherical steel bearing, laminated rubber bearing, radial spherical plain bearing, and connecting bridge bearing, etc. in spatial structures. This paper studies the selection points of joint form, the basic principles of the joint design, the requirement of all the joints aforementioned about steel performance and analyzes the effect of joint stiffness, the estimation method of joint weight, the processing technology and quality control points. The problems that need attention in the design of all the joints aforementioned and the corresponding improvement measures are elaborated in this paper. Some examples of representative joint calculation, analysis and engineering application are given. Finally, this paper points out the development trend of the spatial structure joints design and research in the future.

Li Z.,China Architecture Design and Research Group | Hatzigeorgiou G.D.,Democritus University of Thrace
Soil Dynamics and Earthquake Engineering | Year: 2012

This paper examines the development of a simple and effective concrete damage model for earthquake engineering applications. This constitutive model consists of a modified uniaxial version of the Faria-Oliver model and takes into account most of the basic traits of concrete under monotonic static and dynamic loading, like the different response under compression and tension, the stiffness reduction with the increase of external loading and the appearance of softening behavior. A fiber beam-column element is investigated, which adopts the proposed concrete damage model and the Menegotto-Pinto approach for steel rebars. Then, these constitutive models are implemented into the ABAQUS general purpose finite element program to provide simple and effective computational tools for the seismic inelastic analysis of general 3-D reinforced concrete (RC) framed structures. The proposed method is demonstrated and verified by characteristic numerical examples where it is shown that the proposed damage model can describe successfully the complicated behavior of reinforced concrete under extreme seismic loads. © 2011 Elsevier Ltd.

Turpan area is one of the harsher climate areas in the world. It belongs to the continental desert climate in warm temperate zone, the highest temperature is up to 48.3 in summer (2008) and the lowest temperature in winter is low to -28.9 (1998). The number of days of wind speed more than 17.0 m/s are 80.3 on average and the annual rainfall is only 16mm[1]. However, Turpan area is rich in solar energy resources and the annual sunshine hours are 3200 on average. Thus the key to architecture design is how to withstand extreme climate conditions and make full use of solar energy resources. The case integrates active solar systems and passive solar effect is achieved simultaneously, such as shading, ventilation, insulation, etc. The effect such as sheltering from the wind, guiding the wind and shading sunlight is achieved by setting up semi-translucent PV curtain and certain number of cavity on exterior wall. More, the solar ventilation system between the PV curtain wall and exterior wall can take away the heat generated from the PV curtain wall and interior rooms; PV skylight roof can adjust the illumination of the atrium to avoid too low or too high illumination; The extruding PV curtain wall can block sunlight radiation on the underlying window to achieve self-shading. © 2014 Published by Elsevier Ltd.

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