China Architecture Design and Research Group
China Architecture Design and Research Group
Zhu L.,Beijing University of Civil Engineering and Architecture |
Yang K.,Beijing University of Civil Engineering and Architecture |
Bai Y.,Monash University |
Sun H.,China Architecture Design and Research Group |
Wang M.,Zhong Neng Power Technology Development Company Ltd
Thin-Walled Structures | Year: 2017
This paper studies steel circular hollow section (CHS) X-joints by conducting experiments on the axial compressive strength of unreinforced and reinforced X-joints with external stiffening rings. Three pairs of unreinforced and reinforced X-joints were tested to compare their compressive load capacity. The diameter ratios (β) between the brace and the chord β were 0.25, 0.51 and 0.73 respectively. The experimental setup, parameters and results are presented. The failure modes and load-displacement curves of the unreinforced and reinforced X-joints were compared. It was shown that external stiffening rings greatly increased the axial compressive load capacity of the X-joints, by 86%, 75%, and 58% respectively. Finite element modelling accurately predicted the structural responses of the X-joints with and without external stiffening rings. © 2017 Elsevier Ltd
Zhang J.,Beijing Jiaotong University |
Li B.,Beijing Jiaotong University |
Shan W.,Beijing Jiaotong University |
Yang Q.,Beijing Jiaotong University |
Fan Z.,China Architecture Design and Research Group
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2017
High-frequency-pressure-integration tests were carried out in a wind tunnel to investigate wind load characteristics on smooth cantilevered roof and wavy-shaped cantilevered roof, both of which have the same size. The effects of wavy-shaped roof surface have been evaluated in wind tunnel test. Wind pressure distribution shows that, wavy shape does not change the main mechanism of wind load, but intensifies the separation on the front edge of the roof. Bending moment coefficient is a controlling factor for the wind-resistance design of the main roof structure, and can be derived from integration. Relative to the smooth surface cantilevered roof, the mean bending moment coefficient of the wavy-shaped cantilevered roof is increased by 23% and the RMS (root mean square) of bending moment coefficient of the wavy-shaped cantilevered roof is increased by 20%, under the most unfavorable wind direction angle. But wavy shape decreases the energy concentration of the fluctuating wind load when reduced frequency is between 0.1 and 0.2. Wavy shape has strong influence on the extreme wind pressure, since wind uplift on wavy-shaped cantilevered roof is 13% larger than that on smooth surface cantilevered roof, which is the controlling factor of the wind-resistant design of cladding structures. The influence of wavy shapes should be considered for the wind-resistant design of the wavy-shaped cantilevered roof to ensure safety. © 2017, Editorial Office of Journal of Building Structures. All right reserved.
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.
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.
Ju X.,China Architecture Design and Research Group
Energy Procedia | Year: 2014
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. 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.