在柱子和框架中评估P-Δ (P-Delta) 效应,使用基于光束-柱子微分方程的解的两循环方法
Rodrigo Bird Burgos1, Lucas Encarnação Silva2
1Department of Structures and Foundations, Rio de Janeiro State University, R. São Francisco Xavier, 524, Maracanã, Rio de Janeiro, Brazil.
MethodsX
|December 15, 2023
概括
本研究介绍了一种简化的方法来分析结构中的P-Delta效应,避免复杂的离散和代方案. 新方法为理解结构非线性行为提供了一个教学上有趣的替代方案.
科学领域:
- 结构工程 结构工程
- 计算力学 计算力学 计算力学
- 非线性分析 非线性分析
背景情况:
- 在结构分析中,P-Delta效应是一个关键的非线性现象,特别是在薄型梁柱中.
- 这种效应源于轴负荷对结构的变形形状的影响,增加曲时刻,并可能导致不稳定.
- 传统的分析方法,如有限元素方法,通常涉及复杂的离散和代方案 (例如,牛顿-拉普森),这可能具有挑战性,特别是在教育环境中.
研究的目的:
- 提出一种简化,具有教学价值的方法,用于对P-Delta效应进行非线性分析.
- 开发一种方法,避免离散和代解决者的复杂性.
- 为结构工程师和学生提出一个替代的计算策略.
主要方法:
- 为了简化非线性分析,采用了一种新的两循环方法.
- 一个触角刚度矩阵是直接从束柱微分方程的同质解中导出的.
- 拟议的方法与传统的两循环方法进行比较,该方法使用立方 (赫米蒂安) 多项式和P-Delta效应的伪侧面负载近似.
主要成果:
- 提出的简化非线性分析方法为传统方法提供了可行的替代方案.
- 触角刚度矩阵的直接导出简化了计算过程.
- 这一比较证实了新方法在捕获P-Delta现象方面的有效性.
结论:
- 开发的简化非线性分析方法为计算P-Delta效应提供了更容易获得的方法.
- 这种方法增强了非线性结构分析对学生的教学价值.
- 该方法为实际工程应用提供了一个计算效率高的替代方案.
相关概念视频
Frames: Problem Solving I
486
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.
486
Double Resonance Techniques: Overview
214
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
214
Column Efficiency: Plate Theory
648
Band broadening in a chromatography column is measured by its efficiency. This is determined by the number of theoretical plates (N). Theoretical plate theory states that a separation column consists of a continuous series of imaginary plates where solute equilibration occurs between stationary and mobile phases.
A higher number of theoretical plates signifies better column efficiency and improved separation capabilities. Plate height affects bandwidth and separation quality; it is inversely...
A higher number of theoretical plates signifies better column efficiency and improved separation capabilities. Plate height affects bandwidth and separation quality; it is inversely...
648
Euler's Formula for Pin-Ended Columns
322
In structural engineering, the stability of columns under compressive axial loads is a critical consideration, described as buckling. A typical example involves a column PQ, which is pin-connected at both ends and subjected to a centric axial load F applied at one end, with a reaction force of F' = -F at the other end. Here, it is crucial to understand that when an applied load exceeds the critical load, buckling occurs as the system becomes unstable.
To calculate the critical load,...
To calculate the critical load,...
322
Column Efficiency: Rate Theory
348
The rate theory of chromatography provides quantitative insight into the shapes and widths of elution bands. These bands are based on the random-walk mechanism governing molecular migration within a column. The Gaussian profile of chromatographic bands arises from the cumulative effect of random molecular motions as they progress through the column.
During elution, a solute molecule experiences numerous transitions between stationary and mobile phases, exhibiting irregular residence times in...
During elution, a solute molecule experiences numerous transitions between stationary and mobile phases, exhibiting irregular residence times in...
348
Frames: Problem Solving II
236
Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.
236


