权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Analysis and Design of Energy Absorbing Flexurally Loaded Pultruded Tubes

吸能弯曲加载拉挤管的分析与设计

基本信息

批准号：
9713566
负责人：
Lawrence Bank
金额：
$ 18.92万
依托单位：
University of Wisconsin-Madison
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-03-01 至 2002-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9713566&HistoricalAwards=false
关键词：
Analysis Design Energy Absorbing Flexurally

项目摘要

9713566 Bank This project will study the energy-absorption capacity of composite material tubes when loaded in bending. The ability to absorb energy in flexural deformation is required in framed structural systems. This flexural energy absorption capacity is a central tenant of the design philosophy of steel and reinforced concrete structures, since it allows these structures to develop "plastic-hinge" mechanisms prior to failure. Such "hinges" provide reserve capacity, overall ductility, and an all-important safeguard against catastrophic failure. It is the objective of this project to demonstrate that pseudo-plastic hinges can develop in composite material tubular beams, thus, imparting to composite structural frames an energy- absorption capacity analogous to that found in conventional steel or reinforced concrete frames. The mechanism by which a composite material tubular beam develops "stable" energy absorption is, however, very different from that of a steel or reinforced concrete beam. In these conventional beams, the energy absorption is obtained due to irreversible plastic strain in the elasto-plastic materials. It is the purpose of this study to show that in a composite material tubular beam, energy is absorbed in a stable manner by progressive "tearing failure" at the tube corners, and that this provides the beam with a behavior analogous to that of an elasto-plastic beam. Such a phenomenon has recently been reported but an in-depth study has not been conducted. This research will investigate the phenomenon in-depth, by use of experimentation and numerical modeling, and provide recommendations for design. ***

9713566 Bank 该项目将研究复合材料管在弯曲载荷下的能量吸收能力。框架结构系统需要具有吸收弯曲变形能量的能力。这种弯曲能量吸收能力是钢结构和钢筋混凝土结构设计理念的核心，因为它允许这些结构在失效之前形成“塑性铰链”机制。这种“铰链”提供了储备能力、整体延展性以及防止灾难性故障的重要保障。该项目的目的是证明假塑性铰链可以在复合材料管梁中发展，从而赋予复合结构框架类似于传统钢或钢筋混凝土框架的能量吸收能力。然而，复合材料管梁产生“稳定”能量吸收的机制与钢或钢筋混凝土梁的机制非常不同。在这些传统梁中，能量吸收是由于弹塑性材料中的不可逆塑性应变而获得的。本研究的目的是表明，在复合材料管状梁中，能量通过管角处的渐进“撕裂破坏”以稳定的方式被吸收，这为梁提供了类似于弹塑性梁的行为。最近有报道称这种现象，但尚未进行深入研究。这项研究将通过实验和数值建模深入研究这一现象，并为设计提供建议。 ***