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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. Source

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. Source

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. Source

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. Source

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. Source

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