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相关概念视频

Posttensioned Masonry Walls01:15

Posttensioned Masonry Walls

102

Post-tensioned masonry walls use high-strength steel rods or flexible tendons to enhance the strength and efficiency of masonry structures. These elements are securely anchored to the foundation and extend vertically either within the cores of the masonry units or between the masonry wythes. The construction process involves building the wall with these tensioning elements in place and allowing the mortar to fully cure.
Following the curing process, the tensioning begins. Steel rods are...
102
Expansion and Contraction in Masonry Walls01:19

Expansion and Contraction in Masonry Walls

325
Masonry walls are subject to slight expansion and contraction due to variations in temperature and moisture. Thermal movement in masonry is relatively straightforward to measure and plan for. On the other hand, moisture movement poses more of a challenge. New clay masonry units typically absorb water and expand over time under normal environmental conditions. Conversely, new concrete masonry units tend to shrink as they lose the excess moisture acquired during their production process.
To...
325
Masonry Loadbearing Walls01:16

Masonry Loadbearing Walls

82
Masonry load-bearing walls, constructed from materials like brick, stone, or concrete masonry units, serve as a crucial component in building structures by supporting the loads from floors and roofs and transferring them to the foundation. These walls, known for their compressive strength, can be reinforced or unreinforced to suit different building needs, accommodating both the dead and live loads while maintaining safety through lower working stresses compared to the materials' ultimate...
82
Method of Sections: Problem Solving II01:30

Method of Sections: Problem Solving II

868
Consider an arbitrary truss structure composed of diagonal, vertical, and horizontal members fixed to the wall. To calculate the force acting on members CB, GB, and GH, method of sections can be used. The loads and lengths of the horizontal and vertical members are known parameters, as shown in the figure.
868
Shear on the Horizontal Face of a Beam Element01:16

Shear on the Horizontal Face of a Beam Element

124
To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
124
Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

Unsymmetric Loading of Thin-Walled Members: Problem Solving

79
The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
79

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相关实验视频

Updated: May 10, 2025

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
09:58

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Published on: February 3, 2014

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基于云模型的工作面墙壁稳定性的评估研究.

Xichen Zhao1, Weiming Guan2, Jiayi Sun1

  • 1Geology and Mining Engineering, Xinjiang University, Ürümqi, 830017, Xinjiang, China.

Scientific reports
|April 21, 2025
PubMed
概括

这项研究引入了煤矿工作面墙壁稳定性的新评级系统,结合了专家经验和地质数据. 该模型准确地识别了测试矿的不稳定状态,改善了安全预测.

关键词:
云模型 云模型 云模型裂进化的演变.肋骨裂的情况 肋骨裂主观经验是主观的经验.墙壁稳定性识别 识别 墙壁稳定性识别

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相关实验视频

Last Updated: May 10, 2025

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科学领域:

  • 采矿工程 采矿工程 采矿工程
  • 地质技术工程 地质技术工程
  • 风险评估 风险评估

背景情况:

  • 预测煤矿工作面肋骨裂变的传统方法存在不确定性和模糊性.
  • 准确评估工作面墙壁的稳定性对于确保矿山安全和运营效率至关重要.

研究的目的:

  • 为工作面墙壁稳定性开发一种新的定量评级系统,将主观经验与客观数据相结合.
  • 建立可靠的标准来评估煤矿墙壁的稳定性,并提供一种新的分析方法.

主要方法:

  • 根据专家经验,煤质力学,生产条件和支岩相互作用,构建了一个评级系统.
  • 分析了诸如裂纹特征和声学反等模糊因素的数量.
  • 综合权重方法 (AHP-CRTIC-游戏理论) 和正常云模型用于分析和水平确定.

主要成果:

  • 开发的模型应用于新疆矿山的25,221工作面,将其墙壁稳定性分类为III级 (不稳定).
  • 这种分类与现场观测一致,验证了模型的科学准确性和有效性.
  • 该研究展示了一种分析工作面墙壁稳定性的新方法.

结论:

  • 拟议的评级系统提供了一个科学有效和有效的方法来评估煤矿工作面墙壁的稳定性.
  • 这项研究为加强煤矿安全管理和墙壁稳定性控制提供了宝贵的理论参考和技术支持.