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相关概念视频

Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

103
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
103
Factors Affecting Workability01:24

Factors Affecting Workability

95
The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
95
Quantifying Work02:30

Quantifying Work

19.8K
As a system undergoes a change, its internal energy can change, and energy can be transferred from the system to the surroundings, or from the surroundings to the system. 
19.8K
Workability of Concrete01:25

Workability of Concrete

135
The workability of concrete is a crucial property that affects its handling, placing, and finishing during construction. It describes the ease with which concrete can be mixed, placed, compacted, and finished. Workability is primarily concerned with the concrete's movement and its ability to resist internal friction and external resistance from molds and reinforcements during the application process.
Concrete's workability is determined by its resistance to internal forces that arise...
135
Design Example: Sustainability in Concrete Building01:26

Design Example: Sustainability in Concrete Building

201
As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
201
Design Example: Dimensioning of Concrete Masonry Construction01:13

Design Example: Dimensioning of Concrete Masonry Construction

128
For the construction of a storeroom using concrete masonry units, it's essential to align the dimensions of the structure with the actual sizes of the blocks and the intended mortar joints. On the site in question, there's a stockpile of concrete masonry blocks with a nominal size of eight by eight by sixteen inches, which are to be used in the construction of the storeroom.
The site engineer has laid out a plan for the storeroom with external dimensions of twelve feet in length and...
128

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相关实验视频

Updated: Jul 27, 2025

Spatial Multiobjective Optimization of Agricultural Conservation Practices using a SWAT Model and an Evolutionary Algorithm
11:53

Spatial Multiobjective Optimization of Agricultural Conservation Practices using a SWAT Model and an Evolutionary Algorithm

Published on: December 9, 2012

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在COVID-19背景下,通过多目标优化模型在建筑项目中评估劳动力调度效率.

Federico Corral1, Eric Forcael2, Rodrigo Linfati1

  • 1Department of Industrial Engineering, Universidad del Bío-Bío, Concepción, Chile.

Heliyon
|June 9, 2023
PubMed
概括
此摘要是机器生成的。

随着COVID-19大流行,建筑工人计划受到了重大影响. 雇佣额外的员工被证明比支付加班更昂贵,突出了对优化调度模型的需求.

关键词:
在 COVID-19 疫情中,建筑项目 建筑项目多目标优化多目标优化时间表编制 时间表编制劳动力 劳动力 劳动力 劳动力

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A Quantitative Fitness Analysis Workflow
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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

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相关实验视频

Last Updated: Jul 27, 2025

Spatial Multiobjective Optimization of Agricultural Conservation Practices using a SWAT Model and an Evolutionary Algorithm
11:53

Spatial Multiobjective Optimization of Agricultural Conservation Practices using a SWAT Model and an Evolutionary Algorithm

Published on: December 9, 2012

13.0K
A Quantitative Fitness Analysis Workflow
11:39

A Quantitative Fitness Analysis Workflow

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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
08:36

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科学领域:

  • 建设管理建设管理.
  • 运营研究 运营研究
  • 工业工程 工业工程 工业工程

背景情况:

  • 由于COVID-19大流行,建筑行业受到劳动力距离限制的约束,破坏了正常运营.
  • 项目经理因偏差时间和在流行病条件下招聘新员工而面临更高的成本.

研究的目的:

  • 开发和评估一个数学模型,用于在COVID-19限制下安排劳动力.
  • 量化COVID-19对建筑项目的财务影响,特别是劳动力成本.

主要方法:

  • 制定了一个多目标混合整数线性编程模型.
  • 用权衡和epsilon约束方法来解决模型.
  • 实验包括实验设计和与真实公司的案例研究.

主要成果:

  • 雇佣额外的员工增加了额外的工作时间成本高达104.25%.
  • 维持基线劳动力和承担加班费用被发现是更经济的.
  • 该研究量化了COVID-19限制对劳动力安排的成本影响.

结论:

  • 开发的数学模型可以帮助建筑行业的决策制定有关COVID-19相关成本.
  • 这项研究为建筑行业提供了一种主动的方法来应对大流行引起的挑战.
  • 优化劳动力安排对于减轻健康危机期间的财务影响至关重要.