文档介绍:上海交通大学
硕士学位论文
纤维材料加固(增强)木梁抗弯性能研究
姓名:王锋
申请学位级别:硕士
专业:结构工程
指导教师:董石麟;陈务军
20050101
摘要
纤维材料加固增强木梁抗弯性能研究
摘要
结构加固已成为近几年来结构研究的热点问题之一在我国保存
着大量的古木建筑这些建筑具有极高的艺术和历史价值合理地保
护此类建筑是结构加固的重点研究方向之一针对于此论文在试验
的基础上对纤维材料加固增强木梁抗弯性能进行了研究
试验部分包括 4 根木梁 TB1 TB4 的抗弯性能试验其中
TB1 梁为未采用加固措施的梁作为参照梁 TB2 为 CFRP 布材加固
梁 TB3 为预应力 CFRP 布材加固梁 TB4 为 GFRP 筋材加固增强梁
和木材材性试验木材抗弯弹性模量测定木材抗弯强度测定木材
顺纹抗压强度测定以及木材顺纹抗拉强度测定试验证明加固后
的梁延性提高在抗弯能力方面分别提高 10 25 . 关于 TB3 梁预
应力施加作者提出几种施加方案考虑到试验室条件和费用等问题
试验中采用预弯法 Pre-flex 施加预应力
分析部分在前人关于木材材性本构关系基础上进行改进提出
新的木材材性本构关系这种本构关系简单实用分析中作者采用
两种分析方法一种以我国现行木结构设计规范 GBJ 5 88 为
基础的线弹性分析另一种以改进后木材本构关系为基础参照
ASTM 有关规定进行的非线性分析两种分析结果同试验结果吻合较
I
摘要
好误差基本不超过 10 .另外研究中针对预弯法施加预应力将施
加预应力大小同外力之间建立关系并给出粘结纤维界面应力的解析
解
此外为全面了解纤维材料加固增强木结构的性能论文给
出了纤维加固增强木结构的推荐研究方向
关键词纤维材料结构加固木结构抗弯性能结构分析结构
试验
II
摘要
RESEARCH ON FLEXURAL REINFORCEMENT
OF TIMBERS USING FRP
ABSTRACT
Repair and rehabilitation of structures is ing increasingly for
timber structures due to material deterioration and limited capacity to
modate modern load levels. In China, there are many timber
structures need to repair for their artistic and historic value. Hence,
research on flexural reinforcement of timbers using fiber-reinforced
polymers (FRP) has been proposed in this dissertation.
In the part of experiment of this dissertation, there are four timber
beams: Beam TB1 is plain timber beam as an reference beam; Beam TB2
was reinforced with carbon fiber-reinforced polymers (CFRP); Beam
TB3 was further strengthened with prestress CFRP; and the last Beam
TB4 has been strengthened with glass fiber-reinforced polymer bars
(GFRP). In addition, wood mechanical behaviors experiment has been
done. The experiment results showed that the failure model will change
from brittle tension to a more pression-initiated failure and the
III
摘要
flexural strength may be increased by 10 to 25 percent with the proposed
technique. The author also proposed the meas