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Shear capacity of inverted-U reinforced concrete bridge beams 倒u型钢筋混凝土桥梁梁抗剪承载力研究
IF 1.1 Q4 ENGINEERING, CIVIL Pub Date : 2022-04-13 DOI: 10.1080/13287982.2022.2060546
Mahes P. Rajakaruna, V. Vimonsatit, K. Wong
ABSTRACT Existing reinforced concrete inverted-U beam bridges in Western Australia built using standard beams designed by Public Works Department between 1957 and 1969 were found to have reinforcement anchorage detail at supports not adequate when assessed using recent design standards. Tests were carried out on six full-size bridge beams recovered from a bridge scheduled for replacement to determine whether the deficient detailing adversely affects the shear capacities of these beams. These beams were the longest of the series designed in 1957. In addition, the mean shear strengths of the five bridge beams to AS 5100.5–2004 and to the most recent design standard AS 5100.5–2017 were determined and these were compared with their corresponding test values. It was found from testing that the detail does not affect the shear strength much. The predicted mean shear capacities using AS 5100.5–2017 were found to be more conservative than the corresponding values using AS 5100.5–2004. This suggests the likelihood of low load ratings for shear using the latest design standard (based on the Modified Compression Field Theory) for existing reinforced concrete bridges designed to previous standards.
西澳大利亚现有的钢筋混凝土倒u型梁桥使用1957年至1969年由公共工程部设计的标准梁建造,在使用最新的设计标准进行评估时,发现支撑处的钢筋锚固细节不足。对从预定更换的桥梁中恢复的六个全尺寸桥梁梁进行了试验,以确定细节缺陷是否会对这些梁的剪切能力产生不利影响。这些梁是1957年设计的系列梁中最长的。此外,根据AS 5100.5-2004和最新设计标准AS 5100.5-2017,确定了五座桥梁梁的平均抗剪强度,并将其与相应的测试值进行了比较。试验结果表明,细部对抗剪强度影响不大。使用AS 5100.5-2017预测的平均抗剪能力比使用AS 5100.5-2004的相应值更为保守。这表明使用最新设计标准(基于修正压缩场理论)的现有钢筋混凝土桥梁的低剪切荷载等级的可能性。
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引用次数: 0
Methodology for development of AS 5216 using international harmonisation of construction products standard 采用建筑产品国际协调标准制定AS 5216的方法
IF 1.1 Q4 ENGINEERING, CIVIL Pub Date : 2022-04-03 DOI: 10.1080/13287982.2021.2019886
J. Lee, A. Amirsardari, L. Pham, E. Gad
ABSTRACT The adaptation of the design rules from one country for use in another country is becoming more frequent with growing international trade. For construction products, an individual country, however, still requires conformity assessment of the design rules to its own building regulation. Direct adoption of the design rule is usually not feasible due to differences in design format and material properties specifications. This paper demonstrates the process of adaptation of international design procedures to develop the Australian Standard AS 5216 for metal anchors (fasteners) in concrete. The original European design provisions has been adapted for Australian use. The paper outlines what factors need to be considered in the adaptation process for international harmonisation of structural design for metal anchors in concrete. Furthermore, the paper demonstrates the workability ofBV1 Verification Method in the Australian National Construction Code (NCC) and its limitations for the purpose of demonstration of conformity.
随着国际贸易的发展,一国设计规则在另一国使用的情况越来越多。然而,对于建筑产品,个别国家仍然要求对其自己的建筑法规的设计规则进行符合性评估。由于设计格式和材料性能规格的差异,直接采用设计规则通常是不可行的。本文阐述了采用国际设计程序制定澳大利亚混凝土金属锚(紧固件)标准AS 5216的过程。原来的欧洲设计条款已适应澳大利亚的使用。本文概述了在国际协调混凝土金属锚结构设计的适应过程中需要考虑的因素。此外,本文还论证了澳大利亚国家建筑规范(NCC)中bv1验证方法的可行性及其在符合性论证方面的局限性。
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引用次数: 1
Comparative study of analytical/semi-analytical methods for prediction of axial strength of cold-formed steel wall panels with sheathing 带护套冷弯型钢墙板轴向强度预测的解析/半解析方法比较研究
IF 1.1 Q4 ENGINEERING, CIVIL Pub Date : 2022-04-03 DOI: 10.1080/13287982.2021.2012388
Chanchal Sonkar, A. Mittal
ABSTRACT Load-bearing cold-formed steel (CFS) wall panels comprise of a stud (C-section), track (U-section) and sheathing. Sheathing is fastened to the CFS frame with self-drilling screws, which has an effect on the axial load-carrying capacity of panels. Experiments are complex and often expensive as they require use of different resources (raw material, manpower etc.). Therefore, conducting experiments is not always possible and an efficient design tool is necessary. Few studies are present in literature on comparing the effectiveness of available design methodologies. For the first time, an attempt is made to compare all the three (03) presented mathematical models together to predict the axial strength of CFS wall panels with sheathing. The present study examines the effectiveness of such analytical/semi-analytical tools, namely, Rayleigh-Ritz (R-R) method, Differential equation of equilibrium (DEEq) method and Constrained and Unconstrained Finite Strip Method – Direct Strength Method (CUFSM-DSM) for estimation of axial load-carrying capacity of sheathed CFS panels. The results show that CUFSM-DSM can be utilized meritoriously for evaluation of sheathed CFS wall panels.
承载冷弯型钢(CFS)墙板由螺柱(c型)、轨道(u型)和护套组成。护套是用自钻螺钉固定在CFS框架上的,这对面板的轴向承载能力有影响。实验是复杂的,往往是昂贵的,因为它们需要使用不同的资源(原材料,人力等)。因此,进行实验并不总是可能的,一个有效的设计工具是必要的。文献中很少有关于比较现有设计方法有效性的研究。本文首次尝试将3种(03)数学模型进行比较,以预测含护层的CFS墙板的轴向强度。本研究考察了这些分析/半分析工具的有效性,即瑞利-里兹(R-R)方法、平衡微分方程(DEEq)方法和有约束和无约束有限条法-直接强度法(CUFSM-DSM),用于估计受护CFS板的轴向承载能力。结果表明,cussm - dsm可以很好地用于护套CFS墙板的评价。
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引用次数: 2
Verification of shear and torsional strength of prestressed concrete girders predicted using Australian Standards 用澳大利亚标准预测预应力混凝土梁的抗剪和抗扭强度的验证
IF 1.1 Q4 ENGINEERING, CIVIL Pub Date : 2022-04-03 DOI: 10.1080/13287982.2021.2019884
H. Pham
ABSTRACT The design methodology for shear and torsional strength of reinforced and prestressed concrete beams have been changed recently following the release of AS5100-2017. The shear strength is now required to be computed based on the Modified Compression Field Theory. This is to align Australian practice with international practice. However, there have been many issues identified regarding this switch, especially for prestressed concrete girders. It is not clear to many engineers if the new methodology and formulations in AS5100-2017 do provide a better prediction of the shear strength. In this paper, the author set out to address this question by first explaining the basis of the formulation and the simplifications that have been made. To verify the model, a carefully selected database of published experimental data was collected and the test data was used to validate the accuracy of the code formulation. While the focus of this study is for shear strength of prestressed girders, shear and torsional strength for reinforced girders was also explored.
随着AS5100-2017的发布,钢筋和预应力混凝土梁的抗剪和抗扭强度的设计方法最近发生了变化。目前要求根据修正压缩场理论计算抗剪强度。这是为了使澳大利亚的做法与国际惯例保持一致。然而,关于这种转换,特别是预应力混凝土梁,已经发现了许多问题。对于许多工程师来说,AS5100-2017中的新方法和配方是否能够更好地预测抗剪强度,这一点尚不清楚。在本文中,作者着手解决这个问题,首先解释了公式的基础和所作的简化。为了验证该模型,我们收集了一个精心挑选的已发表实验数据数据库,并使用测试数据来验证代码制定的准确性。本文的研究重点是预应力梁的抗剪强度,同时也对钢筋梁的抗剪和抗扭强度进行了探讨。
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引用次数: 0
Numerical calculation on the seismic performance of a steel frame beam-to-column joint with welding residual stress 考虑焊接残余应力的钢框架梁柱节点抗震性能的数值计算
IF 1.1 Q4 ENGINEERING, CIVIL Pub Date : 2022-04-03 DOI: 10.1080/13287982.2021.2022448
Longyu Cai, Wei Zhang, Z. Liu
ABSTRACT Residual stress has almost always been an essential issue associated with welded structural steel. In this paper, thermal elastic–plastic finite element method (FEM) is adopted to calculate the welding residual stress of a steel frame beam-to-column, and then the calculated residual stress is applied to the subject as an initial condition to calculate its mechanical behaviour. Both monotonic loading and cyclic loading are designed to simulate the seismic behaviour of the structure. Bonora damage model [41–44] is used to calculate the initiation and propagation of the crack. Finally, the hysteretic curve of the structure under cyclic loading is obtained. The results show that the main component of the welding residual stress along weld fillers of the steel frame beam-to-column is longitudinal tensile stress, and the magnitude of the residual tensile stress in welding stable zone is about 1.2 times of the material yield stress. Welding residual stress mainly affects the ductility and fracture behaviour of the steel frame beam-to-column. Under monotonic loading, the drift ratio of crack initiation with welding residual stress is reduced by 9% compared with that without welding residual stress. Under cyclic loading, when welding residual stress is taken into account, the crack initiates a little earlier than when welding residual stress is not considered. Compared with monotonic loading, crack initiates much easier when the structure is subjected to cyclic loading.
残余应力几乎一直是与焊接结构钢相关的一个基本问题。本文采用热弹塑性有限元法对某钢框架梁柱的焊接残余应力进行了计算,并将计算得到的残余应力作为初始条件应用于主体,计算其力学行为。设计了单调荷载和循环荷载来模拟结构的抗震性能。采用Bonora损伤模型[41-44]计算裂纹的起裂和扩展。最后,得到了结构在循环荷载作用下的滞回曲线。结果表明:钢框架沿焊缝填充物方向的焊接残余应力主要为纵向拉应力,焊接稳定区残余拉应力的大小约为材料屈服应力的1.2倍;焊接残余应力主要影响钢框架梁柱的延性和断裂性能。单调加载下,有焊接残余应力的裂纹萌生漂移比无焊接残余应力的裂纹萌生漂移比减小9%。在循环荷载作用下,考虑焊接残余应力时,裂纹产生时间略早于不考虑焊接残余应力时。与单调加载相比,结构在循环加载下更容易产生裂纹。
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引用次数: 1
Probabilistic constitutive law for masonry veneer wall ties 砌体贴面墙铰的概率本构律
IF 1.1 Q4 ENGINEERING, CIVIL Pub Date : 2022-04-03 DOI: 10.1080/13287982.2021.2021628
I. B. Muhit, M. Stewart, M. Masia
ABSTRACT In a masonry veneer wall system, tie strengths and stiffnesses vary randomly and so are not consistent for all ties throughout the wall. To ensure an economical and safe design, this paper uses tie calibration experimental approach in accordance with the standard AS2699.1 to investigate the tie failure load under compression and tension loading. Probabilistic wall tie characterisations are accomplished by estimating the mean, coefficient of variation and characteristic axial compressive and tensile strength from 50 specimens. The displacement across the cavity is recorded, which resulted the complete load versus displacement response. Using the maximum likelihood method, a range of probability distributions are fitted to tie strengths at different displacement histogram data sets, and a best-fitted probability distribution is selected for each case. The inverse cumulative distribution function plots are also used along with the Anderson-Darling test to infer a goodness-of-fit for the probabilistic models. An extensive statistical correlation analysis is also conducted to check the correlation between different tie strengths and associated displacement for both compression and tension loading. Based on the findings, a wall tie constitutive law is proposed to define probabilistic tie behaviour in numerical modelling.
在砌体贴面墙体系统中,粘结条的强度和刚度随机变化,因此在整个墙体中粘结条的强度和刚度并不一致。为了保证设计的经济性和安全性,本文采用了符合AS2699.1标准的拉杆标定实验方法,对拉杆在压缩和拉伸载荷作用下的破坏载荷进行了研究。通过估计50个试件的平均值、变异系数和特征轴向抗压和抗拉强度,完成了概率壁系特征。记录跨空腔的位移,从而得到完整的荷载-位移响应。利用最大似然法,拟合了不同位移直方图数据集上的锚固强度的概率分布范围,并为每种情况选择一个最合适的概率分布。逆累积分布函数图也与安德森-达林检验一起用于推断概率模型的拟合优度。还进行了广泛的统计相关分析,以检查在压缩和拉伸加载下不同的连接强度和相关位移之间的相关性。在此基础上,提出了壁结本构律来定义数值模拟中的概率壁结行为。
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引用次数: 4
Bond-slip Behaviour of Deformed Rebars in Normal and High Strength Concrete at Elevated Temperature-a review 高温下普通和高强混凝土中变形钢筋粘结滑移行为的研究进展
IF 1.1 Q4 ENGINEERING, CIVIL Pub Date : 2022-03-30 DOI: 10.1080/13287982.2022.2055816
S. H. Buch, R. Suhail
ABSTRACT A comprehensive review is undertaken in this study in order to determine the bond-slip behaviour of deformed rebars in normal and high strength concrete at elevated temperatures. The experimental as well as numerical works are reviewed, and the effect of different parametric variations on bond-slip behaviour at elevated temperatures is reviewed.
摘要:为了确定高温下普通和高强度混凝土中变形钢筋的粘结滑移行为,本研究进行了全面的审查。回顾了实验和数值工作,并回顾了不同参数变化对高温下粘结滑移行为的影响。
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引用次数: 2
Editorial address 编辑地址
IF 1.1 Q4 ENGINEERING, CIVIL Pub Date : 2022-03-20 DOI: 10.1097/00000658-194302000-00001
N. Lam
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引用次数: 0
Influence of modified two-stage mixing approaches on recycled aggregate treated with a hybrid method of treatment 改良两段混合方式对混合法处理再生骨料的影响
IF 1.1 Q4 ENGINEERING, CIVIL Pub Date : 2022-03-17 DOI: 10.1080/13287982.2022.2048479
A. Verma, V. S. Babu, A. S.
ABSTRACT The depletion of natural resources occurs at a rapidly decreasing rate due to the growing demand for concrete. Therefore, the current research study uses recycled aggregate (RA) in concrete as a replacement for natural aggregate (NA) after proper treatment. The fresh, hardened, and durability properties have been examined in the current work. The adherent mortar over recycled aggregate (RA) makes it lower grade due to increased water absorption and lower strength. Based on Literature, natural aggregate concrete (NAC) has better strength and durability properties than recycled aggregate concrete (RAC). While making concrete using RA, using a two-stage mixing approach (TSMA) improves RAC properties better than the normal mixing approach (NMA). This study examines the influence of different mixing methods on concrete made from treated recycled aggregate(TRA). Four different mixing variants (viz. NMA, TSMA, TSMA1, TSMA2) were used in this work. The natural aggregate (NA) was replaced with TRA at various replacement levels in all variants, including 0%, 25%, 50%, 75%, and 100% in a control mix of M40. Based on the experimental results, the mixing method TSMA2 improved the various properties like strength and interfacial transition zone (ITZ) of TRA concrete compared to all other mixing techniques considered.
由于对混凝土的需求不断增长,自然资源的消耗正在迅速减少。因此,本研究在混凝土中采用再生骨料(RA)替代经过适当处理的天然骨料(NA)。在目前的工作中,研究了其新鲜、硬化和耐用性能。再生骨料(RA)的粘结砂浆由于吸水率增加而强度降低,使其等级降低。文献表明,天然骨料混凝土(NAC)比再生骨料混凝土(RAC)具有更好的强度和耐久性。在使用RA制造混凝土时,使用两阶段混合方法(TSMA)比普通混合方法(NMA)更好地改善RAC性能。本研究考察了不同的搅拌方法对处理过的再生骨料(TRA)混凝土的影响。在这项工作中使用了四种不同的混合变体(即NMA, TSMA, TSMA1, TSMA2)。天然骨料(NA)在所有变体中以不同的替代水平被TRA替代,包括0%、25%、50%、75%和100%的M40对照混合物。实验结果表明,与所有其他混合技术相比,TSMA2混合方法提高了TRA混凝土的强度和界面过渡区(ITZ)等各项性能。
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引用次数: 2
Influence of incinerated biomedical waste ash and waste glass powder on the mechanical and flexural properties of reinforced geopolymer concrete 焚烧生物医学废灰和废玻璃粉对增强地聚合物混凝土力学和抗弯性能的影响
IF 1.1 Q4 ENGINEERING, CIVIL Pub Date : 2022-03-03 DOI: 10.1080/13287982.2022.2044613
S. A, M. M, A. K, C. A., K. R.
ABSTRACT An extensive experimental study was implemented to investigate the structural and material properties of Waste Glass Powder (WGP) as fine aggregate in Incinerated Bio-Medical Waste Ash (IBWA) – Ground Granulated Blast Furnace Slag (GGBFS) based Geopolymer Concrete (GPC). The research was based on the compressive, splitting tensile and flexural efficiency of GGBS-based geopolymer concrete mixed with IBWA as binder and WGP as fine aggregate. To determine the concrete strength, four different types of proportions were designed as beams and columns. The mechanical properties such as compressive strength and splitting tensile strength and flexural properties for beams such as deflection, ductility factor, flexural strength, and toughness index, and flexural properties for columns such as load-carrying capacity, stress-strain behaviour, and load-deflection behaviours were calculated. Comparative analyzes were performed to assess the efficiency of Waste Glass Powder and Incinerated Biomedical Waste Ash in GGBS-based geopolymer concrete against Reinforced Cement Concrete (RCC). The findings showed that the Waste Glass Powder and Incinerated Bio-Medical Waste Ash embedded in GGBS-based Geopolymer concrete exhibited the highest fracture energy, as predicted from the mechanical bond between the waste materials and the GGBS-based Geopolymer concrete.
摘要:通过实验研究了废玻璃粉(WGP)作为细骨料在焚烧生物医疗废弃物灰(IBWA) -磨粒高炉渣(GGBFS)基地聚合物混凝土(GPC)中的结构和材料性能。研究了以IBWA为粘结剂,WGP为细骨料的ggbs基地聚合物混凝土的抗压、劈裂、拉伸和弯曲效率。为了确定混凝土的强度,设计了四种不同比例的梁和柱。计算了梁的抗压强度和劈裂抗拉强度等力学性能和挠曲性能,如挠度、延性系数、挠曲强度和韧性指数,以及柱的挠曲性能,如承载能力、应力-应变行为和荷载-挠曲行为。对比分析了废玻璃粉和焚烧生物医学废灰在ggbs基地聚合物混凝土中对钢筋水泥混凝土(RCC)的性能。研究结果表明,废玻璃粉和焚烧后的生物医疗废弃物灰分在ggbs基地聚合物混凝土中表现出最高的断裂能,这与废料与ggbs基地聚合物混凝土之间的力学键合预测一致。
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引用次数: 6
期刊
Australian Journal of Structural Engineering
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