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相关概念视频

Design Example: Alignment of a Road Line Using GIS01:17

Design Example: Alignment of a Road Line Using GIS

47
The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
47
Machines: Problem Solving II01:30

Machines: Problem Solving II

308
Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
308
Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

110
In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...
110
Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving01:29

Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving

48
Mechanistic models play a crucial role in algorithms for numerical problem-solving, particularly in nonlinear mixed effects modeling (NMEM). These models aim to minimize specific objective functions by evaluating various parameter estimates, leading to the development of systematic algorithms. In some cases, linearization techniques approximate the model using linear equations.
In individual population analyses, different algorithms are employed, such as Cauchy's method, which uses a...
48
Frames: Problem Solving I01:24

Frames: Problem Solving I

468
Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
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Design of Prismatic Beams for Bending01:23

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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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开发一个模糊的双目标编程和MCDM模型,以优化桥梁维护战略.

Fereydoon Shojaei1, Heidar Dashti Naserabadi2, Mohammad Javad Taheri Amiri3

  • 1Department of Civil Engineering, Islamic Azad University, Qeshm Branch, Qeshm, Iran.

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概括
此摘要是机器生成的。

这项研究优化了伊朗巴博尔萨尔的桥梁维护,使用多目标模型. 增加的预算优先考虑更昂贵的维修,以对桥梁可靠性和网络性能产生更大的影响.

关键词:
桥梁维护成本 桥梁维护成本预算上的约束.生命周期成本 生命周期成本MOPSO MOPSO 的意思是维护战略 维护策略 维护策略优化模型的优化模型.用户成本 用户成本

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科学领域:

  • 土木工程 土木工程是指土木工程.
  • 运输工程 运输工程
  • 运营研究 运营研究

背景情况:

  • 桥梁是重要的城市基础设施,需要持续维护.
  • 有效的桥梁维护确保了网络功能,并最大限度地降低了用户成本.
  • 城市桥梁网络在平衡维护成本,用户影响和可靠性方面面临挑战.

研究的目的:

  • 为桥梁维护和维修策略制定一个多目标优化模型.
  • 考虑预算限制,生命周期成本,用户成本 (交通延误,车辆费用) 和网络可靠性.
  • 优化伊朗巴博尔萨尔桥梁的维护决策.

主要方法:

  • 制定了桥梁维护的多目标优化模型.
  • 采用多目标粒子群优化算法来解决问题.
  • 对预算水平和成本参数 (每小时成本,车辆的时间价值) 进行了敏感性分析.

主要成果:

  • 优化模型有效地在预算限制下平衡竞争目标.
  • 预算水平的增加导致了更多的更昂贵的维修.
  • 更昂贵的维护干预措施对整体桥梁性能和网络可靠性产生了更显著的积极影响.

结论:

  • 开发的模型为战略性桥梁维护规划提供了一个强大的框架.
  • 预算分配对维护策略的选择产生重大影响,有利于高影响力维修.
  • 优化维护计划对于确保城市桥梁网络的长期可靠性和成本效益至关重要.