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相关概念视频

Machines: Problem Solving II01:30

Machines: Problem Solving II

309
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.
309
Design Consideration01:22

Design Consideration

186
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
186
Frames: Problem Solving I01:24

Frames: Problem Solving I

472
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.
472
Upward Impending Motion01:21

Upward Impending Motion

295
A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
295
Eccentric Loading01:16

Eccentric Loading

373
Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
373
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

174
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
174

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相关实验视频

Updated: Jul 1, 2025

Author Spotlight: Development of a Standardized Acupuncture Tool Inspired by Advanced Techniques for Improved Safety and Precision
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按顺序加权的升降操作安全风险评估方法,考虑到合效应.

Kesheng Yan1,2, Lianghai Jin3,4, Xiaoyun Yu5,6

  • 1College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang, 443002, Hubei, China.

Scientific reports
|March 8, 2024
PubMed
概括

本研究引入了一个新的安全风险评估模型,用于起重操作,识别关键风险,如低安全意识和不适当的组件绑定. 这些发现加强了建筑项目的安全管理.

关键词:
合效应是一种合效应.互动矩阵是一种交互矩阵.联合顺序加权运营商 联合顺序加权运营商起重操作 起重操作安全风险 安全风险

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科学领域:

  • 建筑安全工程工程 建筑安全工程
  • 风险管理 风险管理
  • 工业安全 工业安全 工业安全

背景情况:

  • 起重操作在建筑中至关重要,但会带来重大安全风险.
  • 现有的起重操作安全控制措施需要提高准确性.
  • 准确评估安全风险程度对于提高安全控制水平至关重要.

研究的目的:

  • 开发一个全面的系统和模型来评估起重操作的安全风险.
  • 识别关键风险因素,确定起重操作中的安全风险水平.
  • 提供提升操作建筑安全管理和控制的参考.

主要方法:

  • 使用工作分解结构 (WBS) 和风险分解结构 (RBS) 来分解操作和风险.
  • 确定了与起重操作相关的16个安全风险因素.
  • 构建了一个安全风险评估模型,整合了风险合理论,联合顺序权重操作员和交互矩阵.

主要成果:

  • 该研究确定了高风险因素,包括"低安全意识导致工人非法操作"和"工人非法操作导致组件不当结合".
  • 评估表明,起重操作结构的整体风险水平显著.
  • 评估结果与芳古水电站项目的实际情况进行了验证.

结论:

  • 开发的评估系统和模型是合理和有效的,用于评估起重操作安全性.
  • 这些发现为改善建筑工地安全管理和控制提供了宝贵的见解.
  • 该方法提供了一个参考,以提高起重操作的整体安全性.