Wang W.,Tongji University |
Zhou Q.,Tongji University |
Zhou Q.,CITIC General Institute of Architectural Design and Research Co. |
Chen Y.,Tongji University |
And 2 more authors.
Journal of Constructional Steel Research | Year: 2013
This paper presents an experimental investigation on two full-scale tension-only concentrically braced beam-through frames (TOCBBTFs) with through beam bolted connections. This type of TOCBBTF system features cold-formed square-tube section columns connected to H-section through beams by bolted end plate. It is commonly used in low-rise prefabricated buildings. Two two-story, four-span by one-span TOCBBTFs subjected to design vertical load were cyclically loaded horizontally to examine the seismic behavior. Stable behavior was observed up to a story drift angle of 1/10. The cyclic behavior was characterized by a linear response, followed by a slip range and a significant hardening response. Deteriorating pinched hysteresis was observed due to the occurrence of cyclic brace compression buckling and tension yielding. The structural damage evolution, ductility, stiffness and shear force distribution of the TOCBBTFs were investigated. Moreover, the finite element software ABAQUS was used to investigate the behavior of TOCBBTF by nonlinear analysis. Semi-rigid analysis produced the most reasonable prediction including initial lateral stiffness and peak story shear. The calibrated numerical models can be employed to launch further studies for this structural system. © 2012 Elsevier Ltd. All rights reserved.
Shi G.,Tsinghua University |
Fan H.,CITIC General Institute of Architectural Design and Research Co. |
Bai Y.,Monash University |
Zheng J.,Beijing Building Construction Research Institute
Proceedings of the Institution of Civil Engineers: Structures and Buildings | Year: 2015
Damage such as cable pre-stress loss and anchorage failure may occur in a glass curtain wall structure supported by single-layer plane cable net but the influence on overall structural responses has not yet been identified. A finiteelement model considering the stiffness contribution from glass panels is established to study the effects of two forms of damage: pre-stress loss and anchorage failure. The accuracy and reliability of the numerical model are validated experimentally, and the effects of stiffness of the glass panel on stress distributions are discussed. Compared to experimental results, the finite-element model has sufficient accuracy to quantify the damage effects. The contribution from bending stiffness of glass panels to overall structural stiffness is identified as about 10.6% and that from the glass panel membrane effect is about 12.2%. The modelling approach is extended to describe a realistic 15 × 3 15 m glass curtain wall structure. The corresponding parametric analysis demonstrates that the stiffness contribution from glass panels depends on certain design parameters (e.g. number of glass grids and overall span), but can be ignored for structures with more than ten grids. In the investigated structures with 6~15 grids, almost no difference was found between the effects of damage on the glass curtain wall structure and on the pure supporting cable net structure. © ICE Publishing: All rights reserved.
Wen P.F.,Wuhan University of Technology |
Xu P.P.,Citic General Institute of Architectural Design and Research Co. |
Ding K.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2014
It is one of the keys that determining reasonable damping block geometry in the process of designing the extrusion dies. In this paper, the finite element software POLYFLOW was used to simulate the flow process of tread rubber in the head channel. In addition, the orthogonal experiment method was adopted for the optimum design of the damping block in the head channel. After optimum design, the flow velocity of rubber melt becomes more uniform in the full width at the head outlet. Consequently, the warping deformation of the rubber, which flow through the head channel, is also significantly reduced. © (2014) Trans Tech Publications, Switzerland.
Zha X.,Harbin Institute of Technology |
Wan C.,Harbin Institute of Technology |
Fan Y.,CITIC General Institute of Architectural Design and Research Co. |
Ye J.,Lancaster University
Computational Materials Science | Year: 2013
This paper presents a numerical approach using the discrete element method (DEM) to simulate failure modes of metal skinned sandwich panels subjected to uniform pressure. The panels were modeled by assemblies of small size particles that interact with each other through contacts. Different constitutive laws are introduced for the contacts to represent the stiffness and strength characteristics of the metal panels and the core materials. Parametric studies are conducted first to assess the influence of particle radius and friction coefficient on the numerical predictions. The model is then used to predict the mechanical behavior of four sandwich panels with different geometry. The panels are also tested in the laboratory and the test results are compared with the predictions. The comparisons suggest that the DEM model can be used as an alternative tool to predict stiffness and strength of sandwich composites. Moreover the approach can predict detailed local damage and failure modes, which is an advantage over the conventional numerical methods, such as the finite element method. © 2012 Elsevier Ltd. All rights reserved.
Li B.,Harbin Institute of Technology |
Dong Y.-L.,Harbin Institute of Technology |
Dong Y.-L.,Huaqiao University |
Lou Y.-J.,CITIC General Institute of Architectural Design and Research Co. |
Wan L.,Northwestern Architectural Design Institutes
Gongcheng Lixue/Engineering Mechanics | Year: 2015
In order to further understand the fire behavior of concrete floor slabs, a fire test on six continuous panels (two by three) was performed in a full-scale steel-framed building via a self-made furnace and some experimental devices. The test building, the design of furnace and experimental contents are introduced, meanwhile relevant experimental phenomena and failure characteristics are recorded. The experimental data including the furnace temperatures, temperature distributions as well as vertical and horizontal displacements of panels and steel beams are also investigated. The experimental results indicate that the temperature gradient is large during the heat-up stage and a temperature lag appears during the cooling-down stage for the heated panels. For the heated steel beams, there is clear temperature gradient during the early heating-up stage but during the cooling-down stage the temperature tends to uniform. Furthermore, the steel beams in fire do not show partial buckling or failure due to the constraints provided by other structural elements. Therefore, the steel beams exhibit better fire-resistant performance in this test than in standard fire tests. In addition, the heated panels at different positions present distinctive deformations due to different boundary constraints. Due to the arc action of heated steel beams, some deflection curves of the heated panels appear plateau during the heating-up stage. Besides, cracking characteristics of the panels are concerned with the fire intensity and boundary constraints, but they do not depend on whether the steel beams around the panels are fired or not. ©, 2015, Tsinghua University. All right reserved.
Hu X.,Wuhan University |
He H.,CITIC General Institute of Architectural Design and Research Co. |
Jiang W.,Wuhan University
Resources, Environment and Engineering - 2nd Technical Congress on Resources, Environment and Engineering, CREE 2015 | Year: 2016
Structures subjected to violent ground shaking may be left in a displaced condition. This residual or permanent displacement may render the structures unsafe or irreparable. This paper presents the results of a parametric study aimed to construct the constant-ductility Residual Displacement Ratio (RDR) response spectrum of bilinear Single- Degree-of-Freedom (SDOF) systems subjected to strong earthquake ground motions. The RDRs, which are defined as the ratios between the residual displacement and the yield displacement, were computed using nonlinear time history analyses of bilinear SDOF systems subjected to 100 scaled ground motions. The results were statistically organized to establish the constant-ductility RDR response spectrum. © 2016 Taylor & Francis Group, London.
He Y.,Hunan University |
Zhou X.,Hunan University |
Zhou X.,Chongqing University |
Liu D.,Hunan University |
Liu D.,CITIC General Institute of Architectural Design and Research Co.
Thin-Walled Structures | Year: 2014
The structural configuration and method of analysis of the single-layer inverted catenary cylindrical reticulated shell are introduced in this paper, and the elastic as well as elastic-plastic stability of this kind of reticulated shell is then investigated. The stability of the structures with different types of grid patterns is compared, and the reasonable grid pattern is hence recommended. The structural buckling mode and ultimate load-carrying capacity are studied in detail by parametric analysis. Influence of various factors on structural ultimate load is investigated, and the fitting formula of ultimate load is thus presented. Comparison analysis between the inverted catenary and circular cylindrical reticulated shells is also carried out. The work will provide guidance in theory for practical applications of this kind of structure. © 2014 Elsevier Ltd.
Yu G.,Huazhong University of Science and Technology |
Zhang B.,Huazhong University of Science and Technology |
Ding X.,CITIC General Institute of Architectural Design and Research Co.
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | Year: 2015
In order to enhance the performance of phosphorous (P) adsorption onto bamboo charcoal (BC), a novel aluminum modified bamboo charcoal (Al-BC) was fabricated with aluminum chloride solution by aluminum salt hydrolysis coprecipitation method. The physicochemical properties before and after modified bamboo charcoal were determined. And the characteristics of P adsorption onto Al-BC and BC were investigated in batch tests. The results show that the P adsorption process can be described well as Freundlich and Langmuir isotherms, and Freundlich equation is better fitted than Langmuir equation. Adsorption capacity of Al-BC is 10.0 mg·g-1, which is about 1.3 times that of BC. The adsorption well follows Lagergren-second order models. The effect of pH on P adsorption is distinct and the acidic conditions are favor for P adsorption. Humid acid has obviously negative influence on P adsorption, while NO3-has no obvious inhibitory effect on P adsorption. © 2015, Huazhong University of Science and Technology. All right reserved.
Hu P.,Huazhong University of Science and Technology |
Yu Z.,CITIC General Institute of Architectural Design and Research Co. |
Zhu N.,Huazhong University of Science and Technology |
Lei F.,Huazhong University of Science and Technology |
Yuan X.,Huazhong University of Science and Technology
Energy and Buildings | Year: 2013
A vertical U-tube ground heat exchanger can be utilized to exchange heat with the soil in ground source heat pump systems. The outlet temperature of the working fluid through the U-tube is an important characteristic parameter of heat transfer process. It is quantified by an effectiveness coefficient of ground heat exchanger in this paper. A multipole model based upon the multipole theory is developed inside the borehole with a cylindrical heat source outside the borehole, considering the working fluid temperature variety along the U-tube and its heat convection. The model overcomes the boundary shape limitation of traditional analytic model and could analyze the temperature field in complex profile and boundary, such as the two branch pipes of GHE. The experimental validation of the multipole model has been performed. A dynamic simulation was conducted to evaluate the influence of a number of parameters on thermal effectiveness. The effect of some important characteristic factors on the heat transfer performance of ground heat exchangers is analyzed. The results may provide the references for design of ground source heat pump system in actual projects. © 2013 Elsevier B.V. All rights reserved.
Fu Y.,Wuhan University of Science and Technology |
Zhou X.,Wuhan University of Science and Technology |
Zhou H.,CITIC General Institute of Architectural Design and Research Co.
Applied Mechanics and Materials | Year: 2013
Make an analysis and points out that the engineering conditions of variable speed working condition of water pump in line with the proportionality law are as follows: non-back-pressure system, all parallel pumps changing speed synchronously(including a single variable speed pump system) and fixed pipeline characteristic curve. Energy saving effect analysis of variable speed pumps should be based on the energy consumption comparison of the pump variable speed control to other flow control methods in conditions of achieving the same flow, but not to the design working condition. © (2013) Trans Tech Publications, Switzerland.