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THE STRUCTURAL AND CONSTRUCTION PERFORMANCES OF A LARGE-SPAN HALF STEEL-PLATE-REINFORCED CONCRETE HOLLOW ROOF 大跨度半钢板-钢筋混凝土空心屋面结构及施工性能研究
IF 1.7 3区 工程技术 Q3 Engineering Pub Date : 2019-01-01 DOI: 10.18057/IJASC.2019.15.1.3
M. Diao, Yi Li, Xinzheng Lu, H. Guan, Yun-Lun Sun
This paper proposes a new large span half steel-plate-reinforced concrete (H-SC) hollow roof structure for nuclear power plants. The roof composes of 23 I-shaped H-SC beams. Each H-SC beam consists of a steel plate assembly (a bottom plate, a web plate and a short top plate), which is cast inside an I-shaped reinforced concrete beam. This novel system not only has an equivalently high bearing capacity, stiffness and lower gravity load comparing with conventional RC roof, but also can be conveniently constructed by using the bottom plates as formworks. The numerical simulation was conducted to demonstrate its mechanical capacities and the influence of construction process. Firstly, a finite element (FE) model for the H-SC composes was built and a one-third scaled 12 meters large-span H-SC beam was tested to validate the proposed FE model and analyze the steel-concrete-interface bond-slip. Then, the numerical simulation was conducted to assess the effect of the construction process on the mechanical performance of the entire roof structure, in which the deactivation element and trace element techniques were used to simulate the deformation induced by the construction process. The results show that the deflection induced by the construction process accounts for 87% of the final deflection.
提出了一种新型的核电厂大跨度半钢板-钢筋混凝土(H-SC)空心屋面结构。屋顶由23根i形H-SC梁组成。每根H-SC梁由钢板组件(底板、腹板和短顶板)组成,浇筑在工字钢筋混凝土梁内。该系统不仅具有与传统RC屋面同等高的承载力、刚度和较低的重力荷载,而且可以方便地使用底板作为模板进行施工。通过数值模拟验证了其力学性能及施工过程的影响。首先,建立了H-SC组合物的有限元模型,并对1 / 3比例的12 m大跨度H-SC梁进行了试验验证,并对钢-混凝土界面粘结滑移进行了分析。然后,采用失活单元和微量元素技术模拟施工过程引起的变形,进行数值模拟,评估施工过程对整个屋面结构力学性能的影响。结果表明,施工过程引起的挠度占最终挠度的87%。
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引用次数: 0
MODIFICATIONS TO THE GLOBAL AND INTERACTIVE SHEAR BUCKLING ANALYSIS METHODS OF TRAPEZOIDAL CORRUGATED STEEL WEBS FOR BRIDGES 桥梁梯形波纹钢腹板整体和相互作用剪切屈曲分析方法的修正
IF 1.7 3区 工程技术 Q3 Engineering Pub Date : 2019-01-01 DOI: 10.18057/ijasc.2019.15.4.6
Sumei Liu, H. Ding, L. Taerwe, W. Corte
The value of the global shear buckling coefficient kg and the formula for the interactive shear buckling stress of corrugated steel webs (CSWs) are still the subject of debate. In this study, firstly, the analytical formulas for the global and interactive shear buckling stresses of CSWs are deduced by the Galerkin method. Simplified formulas for the global shear buckling coefficient kg for a four-edge simple support, for a four-edge fixed support, for two edges constrained by flanges fixed and the other two edges simply supported, and an interactive shear buckling coefficient table are given. Secondly, an elastic finite element analysis is carried out to verify the analytical formulas and to study the influence of geometric parameters on the shear buckling stress of CSWs. Finally, a design formula for the shear strength of CSWs which adopts the formulas for the global and interactive shear buckling stresses proposed in this paper is assessed. From a comparison between the shear strength calculated by this design formula, calculated by four previous design formulas and measured in a series of published test results, it is found that the considered design formula provides good predictions for the shear strength of CSWs and can be recommended. Received: Revised: Accepted: 15 January 2019 07 June 2019 13 June 2019
波纹钢腹板的整体剪切屈曲系数kg的取值和相互作用剪切屈曲应力的计算公式仍然是争论的主题。本文首先利用伽辽金法推导了csw整体剪切屈曲应力和相互作用剪切屈曲应力的解析公式。给出了四棱简支、四棱固定支、两棱固定、两棱简支整体剪切屈曲系数kg的简化公式,以及相互作用剪切屈曲系数表。其次,进行弹性有限元分析,对解析公式进行验证,研究几何参数对csw剪切屈曲应力的影响。最后,采用本文提出的整体剪切屈曲应力和相互作用剪切屈曲应力计算公式,建立了csw抗剪强度设计公式。将该设计公式计算的抗剪强度与之前4个设计公式计算的抗剪强度以及一系列已发表的试验结果进行对比,发现所考虑的设计公式对csw抗剪强度具有较好的预测效果,可以推荐使用。收稿日期:修订日期:接受日期:2019年1月15日2019年6月07日2019年6月13日
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引用次数: 3
EXPERIMENTAL INVESTIGATION INTO THE CAPACITY OF COLD-FORMED SCREWED STEEL STRAP BRACING CONNECTIONS 冷弯螺纹钢带支撑连接承载力的试验研究
IF 1.7 3区 工程技术 Q3 Engineering Pub Date : 2018-12-01 DOI: 10.18057/IJASC.2018.14.4.3
M. Zeynalian, A. Shelley, H. Ronagh, S. Hatami
An experimental study on the behavior of cold formed steel (CFS) strap bracing connections is presented in this paper. 75 cold-formed steel strap bracing connections were examined. The connections maximum load capacity and the load-deformation behavior as well as the failure modes of the connections are investigated. The strap bracing connections included 0.55mm and 0.75mm cold-formed G550 steel and four different types of steel strap material. The connections behaviors are discussed and the design capacities calculated from different CFS design standards are compared to the experimental results of the connections. The results show that generally the monotonic tested connections capacities are lower than the cyclic capacities. Also, it is found that although the design provisions predict some of the behaviours of screwed connections, they are not fully suited to accurately predicting the ultimate behaviour of the strap bracing connections. Therefore, the recommended capacities for the strap bracing connections are based on the experimental results.
本文对冷弯型钢(CFS)带式支撑连接的性能进行了试验研究。检查了75个冷弯型钢带支撑连接。研究了连接的最大承载能力、荷载-变形行为以及连接的破坏模式。皮带支撑连接包括0.55mm和0.75mm冷弯G550钢和四种不同类型的钢带材料。讨论了连接的性能,并将不同CFS设计标准计算的设计承载力与连接的试验结果进行了比较。结果表明,一般情况下,单调试验连接的承载力小于循环试验连接的承载力。此外,研究发现,虽然设计规定预测了螺纹连接的一些行为,但它们并不完全适合于准确预测带式支撑连接的最终行为。因此,皮带支撑连接的推荐容量是基于实验结果。
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引用次数: 6
COMPOSITE EFFECT OF STUB SQUARE STEEL TUBED COLUMNS UNDER AXIAL COMPRESSION 方钢管短柱轴心受压的复合效应
IF 1.7 3区 工程技术 Q3 Engineering Pub Date : 2018-06-07 DOI: 10.18057/IJASC.2018.4.2.8
Xu-hong Zhou, Dan Gan, Jiepeng Liu, Y. Chen
The in-filled concrete of square tube confined concrete columns (tubed columns for short) is non-uniformly confined and the effectiveness of its confinement is reduced, leading to a complex composite effect. This paper discusses key parameters, including friction, width-to-thickness ratio and chamfered corner radius of steel tubes, which would affect the confinement of square tubes on in-filled concrete. Eighteen specimens with large width-to-thickness ratio and six RC counterparts were tested under axial compression. Four main system parameters were considered in the tests: 1) width-to-thickness ratio (60-160); 2) types of steel tubes (galvanized and ordinary); 3) interface between tube and concrete (reduced friction and not); and 4) with and without reinforcement cage. It was found that the square tubed RC and plain RC columns were characterized by the shear failure mode, but the ductility performance of the tubed columns was much better than the RC specimens. The axial load-carrying capacities of the specimens with smaller friction were slightly lower than those with larger friction. A finite element analysis (FEA) model was developed to analyze the influence of friction and corner radius on of square tubed columns. An effective section confining model considering effective utilization index of square steel tubes was developed to predict the axial load resistances. The results are satisfactory when comparing the predictions to the experimental and nonlinear finite element analysis results.
方管约束混凝土柱(以下简称管柱)的内填混凝土不均匀约束,降低了约束效果,导致复合效应复杂。本文讨论了影响方管对混凝土约束的关键参数,包括摩擦力、宽厚比和倒角半径。对18个大宽厚比试件和6个大宽厚比混凝土试件进行了轴压试验。试验中考虑了四个主要系统参数:1)宽厚比(60-160);2)钢管种类(镀锌和普通);3)管与混凝土界面(减少与不摩擦);4)有无加固笼。研究发现,方筒混凝土柱和普通混凝土柱均表现为剪切破坏模式,但筒混凝土柱的延性性能明显优于普通混凝土试件。小摩擦试件的轴向承载能力略低于大摩擦试件。建立了方管柱的有限元分析模型,分析了摩擦和转角半径对方管柱的影响。建立了考虑方钢管有效利用指标的有效截面约束模型,用于预测方钢管的轴向荷载抗力。将预测结果与实验结果和非线性有限元分析结果进行了比较,结果令人满意。
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引用次数: 6
Fire resistance of a damaged building employing buckling restrained braced system 采用屈曲约束支撑体系的受损建筑的耐火性能
IF 1.7 3区 工程技术 Q3 Engineering Pub Date : 2018-01-01 DOI: 10.18057/IJASC.2018.14.1.1
E. Talebi, M. Tahir, F. Zahmatkesh, A. Kueh, A. Said
This study investigates the influence of buckling restrained brace systems (BRBs) on the overall structural stability against fire following a severe incident, which caused the failure of a column on the first storey of a steel building. A four-storey moment frame fitted with the inverted-V arrangement of braces is modelled, considering a multi-hazard approach. This technique concentrates on a structural plane frame that is designed to meet the progressive collapse criteria according to the U.S. Department of Defense guidelines and assumes that an extreme event damaged a first-storey centre column, before the exposure to an ensuing fire. The performance of BRBs in preventing the global collapse of the structure due to a post-event fire is compared with that of ordinary concentric brace systems (OCBs). The results indicate that BRBs offer a higher global collapse time to the building owing to the greater stiffness they provide to the structural frame. The fire resistance provided by BRBs is restricted to the participation of bracing elements and framing girders afterwards. In the case of OCBs, columns contribute to the structural resistance prior to the full capacity of braces used. To conclude, it is found that BRBs are more capable in maintaining the stability of a damaged building against fire resulting from an extreme event than OCBs. © 2018, Hong Kong Institute of Steel Construction.
本研究探讨了在一次严重事故中导致钢结构建筑首层柱破坏的屈曲约束支撑系统(BRBs)对结构整体防火稳定性的影响。考虑到多危险的方法,建立了一个四层弯矩框架,该框架具有倒v型支撑布置。这种技术集中在一个结构平面框架上,该框架的设计符合美国国防部指导方针的渐进倒塌标准,并假设在暴露于随后的火灾之前,一个极端事件损坏了一楼的中心柱。并与普通同心支撑体系(ocb)进行了比较,分析了brb在火灾后防止结构整体倒塌的性能。结果表明,由于brb为结构框架提供了更大的刚度,因此它们为建筑物提供了更高的整体倒塌时间。brb提供的耐火性能仅限于支撑构件和框架梁的参与。在ocb的情况下,柱在使用支撑的全部容量之前有助于结构阻力。综上所述,brb比ocb更有能力在极端事件引起的火灾中保持受损建筑的稳定性。©2018,香港钢结构学会。
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引用次数: 8
Experimental study on evolution of residual stress in welded box-sections after high temperature exposure 焊接箱形截面高温暴露后残余应力演化的实验研究
IF 1.7 3区 工程技术 Q3 Engineering Pub Date : 2018-01-01 DOI: 10.18057/IJASC.2018.14.1.5
Weiyong Wang, Shiqi Qin, V. Kodur, Yuhang Wang
: Presence of residual stresses can significantly influence the stiffness and fatigue life of steel structures. The extent of residual stress that develops in welded box-shaped sections at room temperature is extensively studied. However, there is limited data on the development of residual stresses after fire exposure. Such fire exposure has great influence on the residual stress distribution due to temperature induced plastic deformation and creep strains in steel. In order to provide benchmark data for the theoretical models and post-fire design recommendations, this paper presents results from an experimental investigation on the post-fire residual stresses in welded box-shaped sections. The tests are carried out by sectioning method, and two types of commonly used steels, mild Q235 steel with a nominal yield stress of 235MPa and high strength Q460 steel with a nominal yield stress of 460MPa are considered. The residual stresses were evaluated after exposing the specimens to 200 ℃ , 400 ℃ , 600 ℃ and 800 ℃ and cooling down to room temperature. Data from the tests clear show that the residual stresses decrease significantly with increase in specimen temperature. Further, results from the tests are utilized to propose simplified relations for temperature induced residual stresses in welded box-section of Q235 and Q460 steels.
残余应力的存在会显著影响钢结构的刚度和疲劳寿命。对焊接箱形截面在室温下产生的残余应力进行了广泛的研究。然而,关于火灾暴露后残余应力发展的数据有限。由于温度引起的塑性变形和蠕变应变对钢的残余应力分布有很大的影响。为了给理论模型和火灾后的设计建议提供基准数据,本文给出了焊接箱形截面火灾后残余应力的实验研究结果。试验采用截面法进行,考虑了两种常用钢材,即标称屈服应力为235MPa的低碳钢Q235和标称屈服应力为460MPa的高强钢Q460。分别在200℃、400℃、600℃和800℃温度下对试样进行残余应力测试,并将其冷却至室温。试验数据清楚地表明,随着试样温度的升高,残余应力显著降低。进一步利用试验结果,提出了Q235和Q460钢焊接箱形截面温度残余应力的简化关系式。
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引用次数: 1
Thermal modelling of load bearing cold-formed steel frame walls under realistic design fire conditions 火灾工况下冷弯型钢框架承重墙的热模拟
IF 1.7 3区 工程技术 Q3 Engineering Pub Date : 2017-06-01 DOI: 10.18057/ijasc.2017.13.2.5
Anthony Ariyanayagam, K. Poologanathan, M. Mahendran
Cold-formed Light gauge Steel Frame (LSF) walls lined with plasterboards are increasingly used in the building industry as primary load bearing components. Although they have been used widely, their behaviour in real building fires is not fully understood. Many experimental and numerical studies have been undertaken to investigate the fire performance of load bearing LSF walls under standard fire conditions. However, the standard fire time-temperature curve given in ISO 834 [1] does not represent the fire load present in typical modern buildings that include considerable amount of thermoplastic materials. Some of these materials with high in calorific values increase the fire severity beyond that of the standard fire curve. Fire performance studies of load bearing LSF walls exposed to realistic design fire curves have also been limited. Therefore in this research, finite element thermal models of LSF wall panels were developed to simulate their fire performance using the recently developed realistic design fire time-temperature curves [2]. Suitable thermal properties were proposed for plasterboards and insulations based on laboratory tests and available literature. The developed finite element thermal models were validated by comparing their thermal performance results with available realistic design fire test results, and were then used in a detailed parametric study. This paper presents the details of the developed finite element thermal models of load bearing LSF wall panels under realistic design fire time-temperature curves and the results. It shows that finite element thermal models of LSF walls can be used to predict the fire performance including their fire resistance rating with reasonable accuracy for varying configurations of plasterboard lined LSF walls exposed to realistic design fire time-temperature curves.
衬有石膏板的冷成型轻钢框架(LSF)墙在建筑行业中越来越多地用作主要承重构件。尽管它们已经被广泛使用,但人们对它们在实际建筑火灾中的行为还没有完全了解。已经进行了许多实验和数值研究来研究在标准火灾条件下承载LSF墙的火灾性能。然而,ISO 834[1]中给出的标准火灾时间-温度曲线并不能代表包括大量热塑性材料的典型现代建筑中存在的火灾荷载。其中一些热值高的材料会使火灾严重程度超过标准火灾曲线。暴露在真实设计火灾曲线下的LSF承重墙的火灾性能研究也受到限制。因此,在本研究中,开发了LSF墙板的有限元热模型,以使用最近开发的真实设计火灾时间-温度曲线来模拟其火灾性能[2]。根据实验室测试和现有文献,提出了石膏板和隔热材料的合适热性能。通过将开发的有限元热模型的热性能结果与现有的真实设计火灾试验结果进行比较,对其进行了验证,然后将其用于详细的参数研究。本文详细介绍了在实际设计火灾时间-温度曲线下开发的LSF承重墙板有限元热模型及其结果。研究表明,对于暴露在真实设计火灾时间-温度曲线下的石膏板内衬LSF墙的不同配置,LSF墙有限元热模型可用于预测火灾性能,包括其耐火等级,具有合理的精度。
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引用次数: 13
Structural performance of boltless beam end connectors 无螺栓梁端连接件的结构性能
IF 1.7 3区 工程技术 Q3 Engineering Pub Date : 2017-01-01 DOI: 10.18057/ijasc.2017.13.2.4
S. Shah, N. Sulong, R. Khan, M. Z. Jumaat
This study examines the structural performance of beam end connectors used as connection device in semi-rigid boltless beam-to-column connections (BCCs) in steel pallet racks (SPRs). A total of six types of specimens were tested which were distinguished by the three different types of beam end connector (BEC) thicknesses and two different numbers of tabs in the (BEC). The experimental testing was performed using double-cantilever test method and the moment-rotation (M-θ) behavior of the connections and key failure modes were evaluated. The influence of variation in the thickness and the number of tabs of the BEC on the behavior of connection was also investigated. Increased connector thickness enabled the connector tabs to sustain higher failure moment. The findings showed that by varying the geometrical properties, the stiffness of the connection was affected at a higher rate as compared to the strength of the connection. A non-linear three dimensional (3D) finite element (FE) model was developed to simulate the experimental investigations. The FE model showed a close agreement with experimental results.
本研究考察了在钢托盘架(SPRs)的半刚性无螺栓梁柱连接(BCCs)中用作连接装置的梁端连接器的结构性能。共测试了6种试件,通过3种不同的梁端接头厚度和2种不同的梁端接头接头数来区分。采用双悬臂梁试验方法进行了试验测试,并对节点的矩转(M-θ)行为和关键破坏模式进行了评估。还研究了BEC的厚度和卡数的变化对连接行为的影响。增加的连接器厚度使连接器卡片能够承受更高的失效力矩。研究结果表明,与连接强度相比,通过改变几何特性,连接的刚度受到的影响更大。建立了一个非线性三维有限元模型来模拟实验研究。有限元模型与实验结果吻合较好。
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引用次数: 7
Optimum position of steel outrigger system for high rise composite buildings subjected to wind loads 风荷载作用下高层复合建筑钢支腿系统的最佳位置
IF 1.7 3区 工程技术 Q3 Engineering Pub Date : 2016-06-03 DOI: 10.18057/ijasc.2016.12.2.4
S. Fawzia, T. Fatima
The responses of composite buildings under wind loads clearly become more critical as the building becomes taller, less stiff and more lightweight. When the composite building increases in height, the stiffness of the structure becomes more important factor and introduction to belt truss and outrigger system is often used to provide sufficient lateral stiffness to the structure. Most of the research works to date is limited to reinforced concrete building with outrigger system of concrete structure, simple building plan layout, single height of a building, one direction wind and single level of outrigger arrangement. There is a scarcity in research works about the effective position of outrigger level on composite buildings under lateral wind loadings when the building plan layout, height and outrigger arrangement are varied. The aim of this paper is to determine the optimum location of steel belt and outrigger systems by using different arrangement of single and double level outrigger for different size, shape and height of composite building. In this study a comprehensive finite element modelling of composite building prototypes is carried out, with three different layouts (Rectangular, Octagonal and L shaped) and for three different storey (28, 42 and 57-storey). Models are analysed for dynamic cyclonic wind loads with various combination of steel belt and outrigger bracings. It is concluded that the effectiveness of the single and double level steel belt and outrigger bracing are varied based on their positions for different size, shape and height of composite building.
复合建筑在风荷载下的响应显然变得越来越重要,因为建筑变得更高,更少的刚性和更轻的重量。当组合建筑的高度增加时,结构的刚度成为更重要的因素,通常采用带桁架和支腿系统来为结构提供足够的侧移刚度。迄今为止的研究工作大多局限于混凝土结构支腿体系的钢筋混凝土建筑,建筑平面布置简单,建筑高度单一,风向单一,支腿布置水平单一。在建筑平面布局、高度和支腿布置方式不同的情况下,组合建筑支腿水平在侧向风荷载作用下的有效位置研究工作还比较缺乏。本文的目的是通过对不同尺寸、形状和高度的组合建筑采用不同的单层和双层支腿布置,确定钢带和支腿系统的最佳位置。在这项研究中,对复合材料建筑原型进行了全面的有限元建模,三种不同的布局(矩形、八角形和L形)和三种不同的楼层(28层、42层和57层)。分析了钢带和支腿支撑不同组合形式下的动态旋风风荷载模型。结果表明,对于不同尺寸、形状和高度的组合建筑,单级钢带和双级钢带及支腿支撑在不同位置的作用是不同的。
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引用次数: 8
Axial Force And Deformation Of A Restrained Steel Beam In Fire : Description and validation of a simplified analytical procedure 火灾中约束钢梁的轴向力和变形:简化分析程序的描述和验证
IF 1.7 3区 工程技术 Q3 Engineering Pub Date : 2016-01-01 DOI: 10.18057/IJASC.2016.12.2
N. Iqbal, Tim Heistermann, M. Veljković, Fernanda Lopes, A. Santiago, L. Silva
Structural fire design is exceedingly adopting the performance based approach. There are evidentadvantages of this approach compared to the prescriptive methods from codes. An analytical procedure, ...
结构防火设计多采用基于性能的方法。与来自代码的规定性方法相比,这种方法有明显的优点。分析程序,…
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引用次数: 4
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Advanced Steel Construction
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