相关实验视频
Updated: May 5, 2026

09:41
Blast Quantification Using Hopkinson Pressure Bars
Published on: July 5, 2016
8.9K
钢筋混凝土梁桥在落石冲击下的动态反应和损伤机制
Haoran Wang1, Wengao Lu2, Wenqing Zhan1
1School of Civil Engineering and Architecture, Guizhou Minzu University, Huaxi District, Guiyang, Guizhou, China.
Scientific reports
|February 11, 2025
概括
这项研究使用Abaqus对混凝土桥梁的落石影响进行了模型化. 结果显示,撞击位置,速度和半径显著影响桥梁损伤和动态反应,突显了桥梁设计中连接接头的重要性.
科学领域:
- 结构工程 结构工程
- 地质技术工程 地质技术工程
- 材料科学 材料科学 材料科学
背景情况:
- 钢筋混凝土 (RC) 结构易受动态负荷的影响,如岩石落.
- 了解撞击机制和损伤进展对于桥梁安全至关重要.
- 之前的研究往往缺乏对桥梁的复杂影响场景的详细分析.
研究的目的:
- 调查预应力混凝土箱梁桥在岩石落冲击下的动态反应和损伤机制.
- 为了验证混凝土塑料损伤模型在阿巴库斯的准确性,进行冲击分析.
- 为地震活跃或地质不稳定的地区的桥梁提供设计建议.
主要方法:
- 基于之前的光束冲击测试,在Abaqus开发了一个有限元模型 (FEM).
- 验证用于冲击负载分析的混凝土塑料损伤模型.
- 在30米跨度桥梁码头上模拟单个和多个岩石撞击的模拟,参数不同 (高度,半径,速度).
主要成果:
- 峰值曲时刻和剪切力发生在单块岩石落下的撞击点.
- 多次岩石落下造成累积损伤,拉伸损伤更为明显.
- 冲击力,位移,曲矩和剪切力随着岩石落下速度和半径的增加而增加.
- 连接接头被确定为对桥梁抵御岩石落影响的弹性至关重要.
结论:
- 该研究提供了一个验证的数值框架,用于分析岩石落对桥梁的影响.
- 研究结果强调,在桥梁设计中需要特别注意连接接头,以应对灾害.
- 结果为高风险地区RC梁桥的设计和修复提供了有价值的参考资料.
相关概念视频
Deformation of a Beam under Transverse Loading
968
Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
The insights from the bending moment diagram extend to...
968
Elastic Curve from the Load Distribution
588
The structural behavior of beams under distributed loads is critical for engineering analysis, which focuses on predicting how beams bend and react under such conditions. Different types of beams (e.g., cantilever, supported, or overhanging) behave differently under distributed load conditions.
For all beams, the analysis of the beam's reaction to distributed loads begins by understanding the relationship between a beam's load and the resulting shear forces and bending moments. Initially, this...
For all beams, the analysis of the beam's reaction to distributed loads begins by understanding the relationship between a beam's load and the resulting shear forces and bending moments. Initially, this...
588
Impact Loading on a Cantilever Beam
1.2K
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...
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
1.2K
Behavior of Concrete Under Compressive Load
949
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
949
Dynamic Modulus of Elasticity of Concrete
1.3K
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
1.3K
Effects of Creep
635
Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
635

