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CFD modelling of initial stages of dam-break flow 溃坝水流初始阶段的CFD模拟
IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-08-22 DOI: 10.1139/cjce-2021-0493
Saeid Esmaeeli Mohsenabadi, I. Nistor, A. Mohammadian, Hossein Kheirkhah Gildeh
Cases of dam failures are seen almost every year globally, and the propagation of rapidly varying unsteady flows resulting from those dam failures has significant environmental and economic consequences. A three-dimensional Computational Fluid Dynamics model was created to solve unsteady Reynolds-Averaged equations to investigate the generation and propagation of dam-break flows and reflected flood waves in the presence of a trapezoidal bottom obstacle. The dam-breaks were modelled using OpenFOAM based on the Volume of Fluid method employing the Finite Volume Method, and the performance of various Reynolds-Averaged Navier-Stokes turbulence models, including the realizable k −  ε, SST k −  ω (Shear Stress Transport k − ω), and v2 −  f models, has been evaluated. To assess the capabilities of the different turbulence models, quantitative comparisons of numerical simulations with laboratory experiments were completed, and it was found that the SST k −  ω model performed better in predicting the free surface profiles and negative bore propagation speeds than the realizable k −  ε and v2 −  f models.
在全球范围内,几乎每年都会发生大坝溃坝事件,而这些大坝溃坝引起的快速变化的非定常流的传播具有重大的环境和经济后果。建立了三维计算流体力学模型,求解非定常reynolds - average方程,研究了存在梯形底障时溃坝流和反射洪波的产生和传播。采用基于流体体积法的OpenFOAM模型,采用有限体积法对溃坝进行了建模,并对各种reynolds - average Navier-Stokes湍流模型的性能进行了评估,包括可实现的k−ε、SST k−ω(剪切应力输运k−ω)和v2−f模型。为了评估不同湍流模型的能力,完成了数值模拟与室内实验的定量比较,发现SST k−ω模型比可实现的k−ε和v2−f模型在预测自由表面轮廓和负孔洞传播速度方面表现更好。
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引用次数: 0
Icing and aufeis in cold regions II: Consequences and mitigation 寒冷地区的结冰和降雪II:后果和缓解措施
IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-08-18 DOI: 10.1139/cjce-2023-0119
B. Turcotte, A. Dubnick, R. McKillop
The process of icing and the resulting layered ice masses, called aufeis, are caused by the freezing of overflow originating from groundwater or surface water. Aufeis can directly impact infrastructure and property, most commonly through winter ice formation and spring flooding within, against, and on the surface of hydraulic structures and transportation infrastructure. They also represent a safety concern for drivers. This geohazard often needs to be managed proactively and efficiently to mitigate associated risks. This paper provides an overview of the consequences of aufeis in northwestern Canada. A total of 50 existing and novel icing and aufeis mitigation approaches are described and classified. The context of applicability for each approach is identified, considering the source of water, the type of infrastructure, and its role in the formation of aufeis. Finally, future research avenues to support the development or improvement of aufeis risk reduction techniques are presented.
结冰的过程和由此产生的层状冰块,称为冰冰,是由地下水或地表水溢出的冻结引起的。洪水可以直接影响基础设施和财产,最常见的是冬季结冰和春季洪水在水工结构和交通基础设施的内部、外部和表面。它们也代表了司机的安全问题。这种地质灾害通常需要积极有效地管理,以减轻相关风险。本文概述了加拿大西北地区森林灾害的后果。共描述和分类了50种现有的和新的减轻结冰和积雪的方法。考虑到水源、基础设施的类型及其在水的形成中的作用,确定了每种方法的适用范围。最后,提出了未来的研究途径,以支持开发或改进降低风险的技术。
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引用次数: 0
River Ice Modeling for Hydropower Operations at Albeni Falls Dam, Idaho 爱达荷州阿尔贝尼瀑布大坝水电运行的河冰模型
IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-08-17 DOI: 10.1139/cjce-2023-0030
C. Engel, Jeremy Giovando, S. Daly
This paper presents a method to quantitatively assess the impact of ice-affected hydraulics on hydropower operations using the widely used HEC-RAS hydraulic model. The model was used to identify historical periods where downstream river ice growth reduced the net head on a US Army Corps of Engineers dam on the Pend Oreille River in Idaho, USA. The model was used to create curves of projected stage impacts based on border ice and continuous bank-to-bank ice-formation scenarios. The temperature modelling capabilities in HEC-RAS were used to hindcast ice formation periods on the river which were validated with shore-based webcam data. These results provide a framework that can be applied to other rivers with hydropower generation, particularly sites where an open water HEC-RAS model exists.
本文提出了一种利用广泛使用的HEC-RAS水力模型定量评估受冰影响的水力对水电运行影响的方法。该模型被用于确定下游河流冰的增长减少了美国陆军工程兵团在爱达荷州彭德奥里耶河大坝净水头的历史时期。该模型被用于创建基于边界冰和连续两岸冰形成情景的预测阶段影响曲线。利用HEC-RAS的温度建模能力来预测河流上的结冰期,并通过岸基网络摄像头数据进行验证。这些结果提供了一个框架,可以应用于其他有水力发电的河流,特别是存在开放水域HEC-RAS模型的地点。
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引用次数: 0
Combined Settlement and Clogging in Drainage Sand Layer for Suspended Solids, Colloids and Inorganic Salts 悬浮物、胶体和无机盐在排水砂层中的联合沉降和堵塞
IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-08-17 DOI: 10.1139/cjce-2023-0064
Jiayu Ma, H. Lu, Kaifan Li, Meng Liu
A combined sedimentation test of suspended solids, colloids, and inorganic salts and a sand column blocking test were conducted, and mineral composition and grain characteristics of sediments were determined. Adsorption and flocculation reactions occurred in colloids (silver iodide) and inorganic salts (calcium chloride or aluminum sulfate), and final products were flocculation or flocculent network polymers. This increased the sedimentation rate of suspended matter by 8–18 times. Combined migration of suspended solids, colloids (silver iodide), and inorganic salts (calcium chloride or aluminum sulfate) significantly exacerbated silting of sand columns. Compared with sand column silting caused by pure SS, this combined migration more than halved sand column silting time and reduced hydraulic conductivity by nearly one order of magnitude.
进行了悬浮物、胶体和无机盐的联合沉降试验和砂柱堵塞试验,测定了沉积物的矿物组成和颗粒特征。胶体(碘化银)和无机盐(氯化钙或硫酸铝)发生吸附和絮凝反应,最终产物为絮凝或絮凝网状聚合物。这使悬浮物的沉降速率提高了8-18倍。悬浮固体、胶体(碘化银)和无机盐(氯化钙或硫酸铝)的联合迁移显著加剧了沙柱的淤积。与纯SS引起的砂柱淤积相比,这种联合迁移使砂柱淤积时间缩短了一半以上,并使导水率降低了近一个数量级。
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引用次数: 0
Impact of Concrete Masonry Unit Geometry on Masonry Assemblage Strength 混凝土砌体单元几何形状对砌体组合强度的影响
IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-08-09 DOI: 10.1139/cjce-2023-0121
Nitesh Chhetri, L. Feldman
An experimental investigation of 126 masonry prisms was conducted to assess the influence of concrete masonry unit web height on structural response. All prisms had the same overall geometry, were either grouted or left hollow, and included either: regular stretcher units with full-height webs, knock-out units with remaining web height conforming to typical Canadian practice, or knock-out units with remaining web height resulting in a calculated normalized web area approaching the minimum permissible in accordance with U.S. standard ASTM C90. Cracks in hollow prisms shifted from the centre of the exterior web face for those constructed with regular stretcher units to the web-face shell interface as the remaining web height decreased. The stability of the grout columns in grouted prisms reduced stress concentrations at the web-face shell interface and the effects of increased restraint with reduced height-to-thickness ratio.
通过对126块砌体棱镜的试验研究,探讨了混凝土砌体单元腹板高度对结构响应的影响。所有棱镜具有相同的整体几何形状,要么是灌浆的,要么是中空的,并且包括:具有全高腹板的常规拉伸单元,具有符合典型加拿大实践的剩余腹板高度的敲除单元,或具有剩余腹板高度的敲除单元,其计算的标准化腹板面积接近符合美国标准ASTM C90的最小允许。随着剩余腹板高度的降低,空心棱柱中的裂缝从腹板外表面的中心转移到腹板面壳界面。注浆柱的稳定性降低了腹板面壳界面处的应力集中,降低了高厚比增加的约束效应。
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引用次数: 0
Performance Evaluation of Petroleum Hard Pitch Modified with Rice Straw Bio-Oil 秸秆生物油改性石油硬沥青的性能评价
IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-08-04 DOI: 10.1139/cjce-2022-0467
Muskan Verma, Bharath Gottumukkala, A. Behl, Bhaskar Thallada, V. Kakade, J. Kumar
In a present study, bio-binder was made using the bio-oil obtained from rice straw and petroleum hard pitch to reduce the air pollution caused by the burning of waste rice straw in the field. The physical, rheological, and chemical tests were conducted on the viscosity grade binders (VG30 & VG40), petroleum hard pitch, and bio-binders prepared with a blending of petroleum hard pitch with 20 and 30 wt.%. The performance of bituminous mixes made with viscosity grade binders and bio-binder was evaluated by using the dynamic creep, resilient modulus, and tensile strength tests. The results of the frequency sweep and FTIR tests indicate that bio-binders have poor resistance to aging. The rut resistance of the bio-binder modified mix was better than that of the VG30 mix. There is no significant difference in moisture resistance of bituminous mixes prepared with bio-binder and viscosity grade binders.
以秸秆生物油和石油硬沥青为原料制备生物粘合剂,以减少秸秆焚烧对大气的污染。对粘度级粘结剂(VG30和VG40)、石油硬沥青和由20%和30%石油硬沥青混合而成的生物粘结剂进行了物理、流变学和化学测试。通过动态蠕变、弹性模量和拉伸强度试验,对粘度级粘结剂和生物粘结剂配制的沥青混合料的性能进行了评价。扫描和红外光谱测试结果表明,生物粘合剂的抗老化性能较差。生物粘结剂改性混合料的抗车辙性优于VG30混合料。生物粘结剂与粘度级粘结剂配制的沥青混合料的抗湿性无显著差异。
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引用次数: 0
Analysing delay factors in construction projects using Z-number approach: Insights from Pakistan 用z数方法分析建设项目中的延迟因素:来自巴基斯坦的见解
IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-08-03 DOI: 10.1139/cjce-2022-0310
M. Nadeem, Izhar Mithal Jiskani, Muhammad Salman Urwat, Salah Uddin, K. Akhtar, Nadar Hussain Khokhar
Delays are a pervasive challenge in the global construction industry, requiring more consideration to address project failure. This research proposes an improved methodology for analysing delays in the construction industry. Through a literature review, a set of 85 delay factors were identified and classified into five categories aligned with the various project phases: initiation, design, procurement, execution, and closeout. A method based on the Z-number theory was developed for the evaluation and prioritization of delay factors in the context of Pakistan. This approach incorporates expert judgment, confidence level, and experience to enhance the reliability of the evaluation. The research findings underscore the substantial influence of several critical factors on project delays. Specifically, factors such as cost inflation, contractor financial issues, inadequate project supervision and management, adverse weather conditions, insufficient skilled labour, delays in government document approvals, and unforeseen cost escalations during construction emerged as the foremost contributors to project delays.
延迟是全球建筑行业普遍存在的挑战,需要更多地考虑解决项目失败问题。这项研究提出了一种改进的方法来分析建筑业的延误。通过文献回顾,确定了85个延迟因素,并根据不同的项目阶段将其分为五类:启动、设计、采购、执行和结束。在巴基斯坦的背景下,开发了一种基于z数理论的延迟因素评估和优先排序方法。这种方法结合了专家判断、置信度和经验来提高评估的可靠性。研究结果强调了几个关键因素对项目延迟的重大影响。具体而言,诸如成本膨胀、承包商财务问题、项目监督和管理不足、恶劣天气条件、熟练劳动力不足、政府文件审批延迟以及施工期间不可预见的成本上升等因素成为项目延误的主要原因。
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引用次数: 0
The effect of climate change combined with clogged joints on bridge integrity in Canada. 气候变化和接缝堵塞对加拿大桥梁完整性的影响。
IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-08-03 DOI: 10.1139/cjce-2022-0295
Musab Nassar, L. Amleh
This study examines the impact of climate change combined with clogged expansion joints on the integrity of four typical I- and box-girder bridges in Canada. The investigation considers ten different climate regions across the country. The results reveal that the accumulation of debris, including compacted ice in expansion joints, poses a significant threat to bridge structures. Winnipeg and Saskatoon are identified as the most vulnerable regions to projected temperature changes with restricted movement, while Vancouver shows the lowest susceptibility. The study recommends classifying climate regions based on their vulnerability to climate change to facilitate resource allocation for bridge maintenance, rehabilitation, and replacement. Furthermore, a formula is introduced to assess and prioritize critical bridges in Canada's extensive inventory, offering a systematic and objective approach to efficient resource allocation for bridge maintenance, repair, and rehabilitation.
本研究考察了气候变化结合堵塞伸缩缝对加拿大四座典型工字钢箱梁桥完整性的影响。这项调查考虑了全国十个不同的气候区。研究结果表明,包括膨胀缝压实冰在内的碎片堆积对桥梁结构构成了重大威胁。温尼伯和萨斯卡通被确定为最易受预测温度变化影响的地区,移动受限,而温哥华的易感性最低。该研究建议根据气候变化的脆弱性对气候区域进行分类,以促进桥梁维护、修复和更换的资源分配。此外,介绍了一个公式来评估和优先考虑加拿大广泛的库存中的关键桥梁,为桥梁维护,维修和修复提供了一个系统和客观的方法来有效分配资源。
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引用次数: 1
Integrated FAHP-FDEMATEL for Determining Causal Relationships in Construction Crew Productivity Modeling 基于FAHP-FDEMATEL的施工人员生产率模型因果关系分析
IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-08-01 DOI: 10.1139/cjce-2022-0425
N. Kedir, A. Fayek
Construction crew productivity is affected by the motivation of the crew performing given activities and by situational/contextual factors forming the dynamic construction environment. The literature lacks a comprehensive analysis of causal relationships between crew motivation and situational/contextual factors for dynamic modelling of crew productivity. The contributions of this paper are 1) identifying a set of criteria for performing expert weight assignment for heterogenous group experts in productivity research, 2) proposing an integrated fuzzy analytic hierarchy process–fuzzy decision-making trial and evaluation laboratory (FAHP-FDEMATEL) approach that provides a systematic, structured method for determining causal relationship mapping between factors affecting crew productivity, and 3) proposing an approach for identifying cause-and-effect groups amongst the situational/contextual factors and crew motivation, which can further be used to formulate strategic productivity improvement solutions. The proposed methodology is demonstrated using a case study on an actual industrial construction project in Alberta, Canada.
施工人员的生产效率受到船员进行特定活动的动机和形成动态施工环境的情景/语境因素的影响。文献缺乏对船员动机和情景/语境因素之间因果关系的全面分析,无法对船员生产力进行动态建模。本文的贡献在于:1)确定了一套执行专家权重分配的标准,用于生产率研究中的异质组专家;2)提出了一种综合模糊层次分析法-模糊决策试验和评价实验室(FAHP-FDEMATEL)方法,该方法为确定影响机组生产率的因素之间的因果关系映射提供了系统的结构化方法。3)提出在情景/情境因素和机组动机中识别因果关系组的方法,并进一步用于制定战略性生产力改进解决方案。本文以加拿大阿尔伯塔省的一个实际工业建设项目为例,对所提出的方法进行了论证。
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引用次数: 0
Sustainability Performance of Interior Wall Types Used in Canada: A Life Cycle Thinking-based Comparison 加拿大使用的内墙类型的可持续性能:基于生命周期思维的比较
IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-08-01 DOI: 10.1139/cjce-2022-0517
Kartik P. Patel, Rajeev Ruparathna
The wall system constitutes a large portion of the material used in building construction. Although non-structural interior walls cover more surface area within a building, published literature has mainly focused on the performance assessment of exterior walls. The aim of this research is to examine the life cycle environmental, social, and economic performance of interior wall construction methods (i.e., concrete block masonry, wood stud gypsum, and steel stud gypsum) used for Industrial, Commercial, and Institutional buildings. The findings indicated that the environmental, social, and economic performance of concrete block masonry wall is 49%, 23%, and 18% higher than the next best alternative. This research has generated important information that can be used in material specification for greener building design.
墙体系统构成了建筑施工中使用的材料的很大一部分。虽然非结构性内墙在建筑物内占据了更多的表面积,但已发表的文献主要集中在外墙的性能评估上。本研究的目的是检查用于工业、商业和公共机构建筑的内墙施工方法(即混凝土砌块、木钉石膏和钢钉石膏)的生命周期环境、社会和经济性能。研究结果表明,混凝土砌块砌体墙的环境、社会和经济性能比次优选择分别高出49%、23%和18%。本研究为绿色建筑设计的材料规范提供了重要信息。
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引用次数: 0
期刊
Canadian Journal of Civil Engineering
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