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相关概念视频

Impact Loading on a Cantilever Beam01:13

Impact Loading on a Cantilever Beam

401
The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
401
Impact Strength of Concrete01:21

Impact Strength of Concrete

212
Impact strength in concrete is a critical measure that reflects the material's capability to endure the forces applied during pile driving and when supporting machinery foundations that experience impulsive loads. It is also essential when handling precast concrete components to prevent accidental damage. The impact strength is assessed by observing the concrete's resistance to repeated impacts and energy absorption capacity. A key indicator of significant damage to concrete is when it...
212
Design Example: Joints in Concrete Pavements01:28

Design Example: Joints in Concrete Pavements

186
Concrete pavement joints are essential for maintaining the structural integrity and longevity of pavement by controlling where and how the pavement cracks. These joints can be categorized based on their functions, such as contraction or control joints, construction joints, isolation joints, and expansion joints.
Contraction joints are typically formed by sawing a groove into the concrete shortly after it has hardened. This creates a weakened vertical plane, deliberately encouraging cracking at...
186
Impact Loading01:19

Impact Loading

202
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
202
Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

122
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
122
Tensile Strength Considerations of Concrete01:16

Tensile Strength Considerations of Concrete

132
Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen...
132

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Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
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在桥梁混凝土甲板上以代为基础的冲击力识别.

Maria Rashidi1, Shabnam Tashakori2, Hamed Kalhori3,4

  • 1Centre for Infrastructure Engineering, Western Sydney University, Kingswood, NSW 2747, Australia.

Sensors (Basel, Switzerland)
|November 25, 2023
PubMed
概括
此摘要是机器生成的。

本研究引入了一种改进的方法来识别对钢筋混凝土结构的影响力,这对于结构健康监测至关重要. 使用低通波器的兰德韦伯方法准确地重建了撞击事件及其位置.

关键词:
兰德韦伯的方法桥梁混凝土甲板的甲板.冲击力识别 冲击力识别影响本地化影响本地化.代规范化的代规范化结构健康监测 结构健康监测

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科学领域:

  • 土木工程 土木工程是指土木工程.
  • 结构健康监测 结构健康监测
  • 计算力学 计算力学 计算力学

背景情况:

  • 钢筋混凝土甲板在桥梁和铁路中至关重要,但易受冲击损坏的影响.
  • 准确的冲击识别对于结构健康监测至关重要,但由于传感器放置的局限性而具有挑战性.
  • 反向识别方法是有希望的,但往往患有不良位置.

研究的目的:

  • 开发和验证一种有效的反向识别方法,用于对钢筋混凝土甲板的冲击力.
  • 为了提高冲击本地化和时间历史重建的准确性.
  • 为了解决结构影响分析中反向问题的错误性质.

主要方法:

  • 应用Landweber代规范化方法用于冲击力识别.
  • 将低通波器集成到Landweber程序中,以改善重建.
  • 为准确性评估制定标准化重建错误指标.
  • 使用高斯形状来自动定位冲击力.

主要成果:

  • 提出的基于Landweber的方法成功地识别了冲击力,包括本地化和时间历史重建.
  • 纳入低通波器显然增加了重建的准确性.
  • 标准化错误指标为评估识别性能提供了可靠的手段.
  • 在桥甲板上的实验验证证证了开发的技术的有效性.

结论:

  • 用低通波器增强的Landweber方法提供了一种可靠且计算效率高的解决方案,用于在民用结构中识别冲击力.
  • 拟议的技术在结构健康监测方面取得了重大进展,使得能够更好地评估影响事件.
  • 正如研究中所讨论的那样,最佳的传感器放置和规则化代是成功识别影响的关键因素.