论文总字数：29322字

摘 要

预应力纤维复合材料（Fiber Reinforced Polymer，FRP）贴片技术是一种新型有效的混凝土结构维修加固技术，具有轻质高强、易于施工、耐久性好等优点，已在包括我国在内的大多数国家的土木结构补强工程中得到广泛应用。然而，给贴片施加预应力通常需要沉重且复杂的夹具，这成为实际工程应用中的难题。形状记忆合金（Shape Memory Alloy，SMA）是一种新型合金类材料，具有超弹性、形状记忆等特点。现提出一种新方法，将预应变处理过的SMA纤维嵌入FRR覆盖贴片中，通过抑制其形状记忆效应来实现预应力的施加。该方法克服了与传统预应力施加相关的挑战，具有较大的研究意义及工程应用前景。

本文介绍SMA-FRP复合材料发展概念；通过理论分析、数值模拟，在Brinson本构模型的基础上，利用MATLAB软件进行SMA/FRP复合材料的形状记忆效应仿真分析；并通过试验对模拟效果进行对比分析。文中主要研究工作如下：

1. 总结SMA/FRP复合材料发展概念，介绍组成材料的物理力学性质。
2. 比较分析了从不同理论出发的SMA本构模型，并选择模型作为研究基础。
3. 通过理论推导得出SMA形状记忆效应计算表达式。
4. 利用MATLAB软件编写仿真程序。
5. 将SMA的受限回复试验数据与模拟结果拟合分析，对仿真程序进行优化。

关键词：纤维复合材料；形状记忆合金；形状记忆效应；仿真模拟

ABSTRACT

Externally bonded pre-stressed Fiber Reinforced Patch (FRP) reinforcement is a novel and effective concrete strengthening technique. With the advantages of lightweight and high strength, easy installation and good durability, it has been widely used in most countries including china. However, applying pre-stress to FRP typically requires heavy and complicated fixtures, which becomes a challenge in practical engineering applications. Shape Memory Alloy (SMA) is a new type of alloy material with Super Elasticity and Shape Memory Effect. This paper presents a new approach in which the pre-stressing force is applied by restraining the shape memory effect of SMA wires. The wires are subsequently embedded in an FRP overlay patch. This method overcomes the practical challenges associated with conventional pre-stressing, and has great research significance and engineering application prospects.

This paper presents the conceptual development of the SMA-FRP patch. Based on Brinson constitutive model, the shape memory effect simulation analysis of SMA/FRP composites is carried out by using MATLAB software, through theoretical analysis and numerical simulation. The simulation results are compared with experimental results. The main research work in the paper is as follows:

1. Presenting the conceptual development of SMA/FRP composite patch. Introduce the physical and mechanical properties of the main constituent materials.
2. Detailing several SMA constitutive models from different theories, and selecting one as the research basis.
3. Based on the Brinson one-dimensional model, the expression of SMA shape memory effect is obtained through theoretical analysis.
4. Using MATLAB software to construct simulation programs.
5. Compare the SMA's limited recovery test data with the simulation results and optimize the simulation program.

KEY WORDS: Fiber Reinforced Patch; Shape Memory Alloy; Shape Memory Effect; Simulation

目 录

摘 要 I

ABSTRACT II

目 录 III

第一章 绪论 1

1.1 研究背景 1

1.2 国内外研究现状 1

1.2.1 混凝土结构加固技术 1

1.2.2 FRP加固混凝土技术 2

1.2.3 SMA的研究与应用 3

1.3 主要内容及技术路线 5

1.3.1 论文内容 5

1.3.2 技术路线 6

1.4 本章总结 6

第二章 SMA/FRP复合材料 7

2.1 概念提出 7

2.2 纤维复合材料 8

2.3 形状记忆合金 10

2.3.1 宏观力学性能 10

2.3.2 微观相变机制 11

2.3.3 SMA的基本性能数据 13

2.4 环氧树脂 14

2.5 本章总结 15

第三章 形状记忆效应模拟 16

3.1 SMA本构模型 16

3.1.1 Tanaka模型 16

3.1.2 Liang模型 18

3.1.3 Brinson模型 19

3.2 受限回复分析 21

3.3 数值模拟 22

3.4 本章小结 27

第四章 试验结果与模拟分析 28

4.1 试验方案介绍 28

4.1.1 试验装置 28

4.1.2 试验准备 29

4.1.3 试验步骤 30

4.2 试验结果分析 30

4.2.1 数据对比 31

4.2.2 模拟效果分析 32

4.2.3 模型改进 33

4.3 本章小结 35

第五章 结论与展望 36

5.1 总结 36

5.2 不足与展望 36

参考文献 38

附 录 40

SME模型代码 40

剩余内容已隐藏，请支付后下载全文，论文总字数：29322字