论文总字数：81754字

摘 要

纤维增强复合材料（FRP）是近些年来在土木工程领域尤其是桥梁工程中应用研究较多的一种新型材料，具有单向受力性能优秀的特点，适合用于桁架结构。桁架-混凝土组合结构梁桥也是最近几年国内外研究较多的新型组合梁桥。本文以FRP桁架-混凝土组合梁桥为研究对象，探讨这种组合梁桥的可行性，对结构选型、节点连接方式、受压腹杆的计算理论与设计方法进行研究，并进行了两种结构的FRP桁架-混凝土组合梁桥的设计。主要内容如下：

（1）FRP桁架-混凝土组合体系选型研究

针对不同的桁架桥结构形式及其受力特点，以桁架的承载形式、腹杆布置形式、桁架-混凝土组合形式为参数对桁架的力学性能进行分析，分析不同结构体系桁架-混凝土组合梁桥的工作机理和受力。为了充分发挥FRP材料在体系中的运用，在结构体系的研究基础上考虑FRP的性质，提出合理的桁架形式与组合形式。

（2）节点设计方法研究

对FRP-混凝土组合结构的桁架构件连接节点进行研究，推荐一种径向压应力作用下复合材料机械咬合连接构造，并对其受力性能及设计方法进行探讨。对腹杆与混凝土的连接节点进行研究，提出一种基于PBL连接的节点构造，并对其受力性能及设计方法进行探讨。

（3）腹杆设计方法研究

基于腹杆同时受拉、受压的设计要求，着重研究了腹杆的受压性能。对空心FRP腹杆轴心受压性能进行研究，结合现有理论给出设计建议。对FRP管约束混凝土腹杆的轴心受压性能进行研究，将核心混凝土单独受压与FRP管和核心混凝土共同受压的两种形式分开考虑，对现有的规范和理论进行计算对比，提出了优化的轴心受压理论，并给出设计方法。

（4）桁腹组合梁桥与板桁组合梁桥设计

提出了FRP桁架-混凝土桁腹组合梁桥与板桁组合梁桥的设计要点与设计流程，进行主梁截面、腹杆、弦杆、节点连接方式和预应力设计，以Midas软件进行计算并验算。

关键词：FRP桁架，板桁结构，桁腹结构，咬合连接，FRP约束混凝土腹杆

Research and Design of the FRP Truss-Concrete Deck Composite Girder Bridge with Span 40m

Bachelor Candidate：ZANG Peng-qiao

Supervisor：WANG Jing-quan

Abstract

Fiber reinforced polymer (FRP) is a kind of new material used more frequently in the field of civil engineering especially bridge engineering during recent years. Its axial strength is high and is suitable for truss structure. Truss-concrete composite girder bridge is also a new type of composite girder bridge in recent years. This paper take the FRP truss-concrete composite girder bridge as the research object, explore the feasibility of this combination, study structure selection, calculation theory and design method of joint connection and compression web member, and complete the design of two kinds of FRP truss-concrete composite girder bridge structure. The main contents are as follows:

1. Study of the selection of FRP truss-concrete composite bridge

This part is aimed at truss bridge with different structure and force characteristics, uses bearing form, structure form, composite form for parameters to study the mechanical properties of the truss, analyses working mechanism and mechanical characteristics of different structure system of truss-concrete composite girder bridge. In order to make good use of the FRP material in the system, this part considers the characteristics of FRP in the research of structure system and proposed two reasonable truss composite forms.

1. Research on the design method of joints

This part studies the truss member’s connections of FRP truss-concrete composite structure, proposes a kind of composite mechanical connection under the action of the pre-tightening force, and studies its mechanical behavior and design method. This part also researches on the connection between the truss web members and concrete, proposes a joint structure based on PBL connection and discusses its mechanical performance and design method.

1. Research on the design method of web members

Based on the design requirements of the truss web member under both compression and tension at the same time, this part emphasizes the study on the compression performance of the truss web member. The research on the axial compression of the hollow FRP truss web member is conducted and the design suggestion is given. The research on the axial compression performance of FRP tube confined concrete web members is conducted. It considers two forms of the core concrete overtaking compression alone and the FRP tube and the core concrete overtaking compression in the same time separately. This part calculates and compares the existing code and theory, proposes optimizations to axial compression theory and gives design methods.

1. The design of FRP-concrete bridge with plate truss structure and truss web structure

This part proposes key points and design process of FRP-concrete bridge with plate truss structure and truss web structure, conducts designs of girder, truss, chord, joints and proposes calculation with Midas software and check computation.

Key words：FRP Truss, Truss Web Structure, Plate Truss Structure, Pre-tightening tooth connection, Web member with FRP confined concrete

目录

摘要 I

Abstract II

目录 IV

第一章 绪论 1

1.1 FRP应用概述 1

1.1.1 FRP材料特性及其在桥梁中的应用 1

1.1.2 FRP桁架桥发展现状 2

1.2 桁架-混凝土组合桥结构体系 3

1.2.1 桁架-混凝土组合桥的基本结构体系 3

1.2.2 桁架-混凝土组合桥体系的应用与发展 4

1.3 FRP桁架-混凝土组合桥体系的研究意义与难点 6

1.3.1 FRP桁架-混凝土组合桥体系的研究意义 6

1.3.2 FRP应用到组合体系中的难点 7

1.3.3 桁架-混凝土组合体系的难点 7

1.4 主要研究内容 8

第二章 FRP桁架-混凝土组合体系选型研究 10

2.1 FRP桁架-混凝土组合体系选型的研究意义 10

2.2 不同桁架形式受力性能的研究 11

2.2.1 不同桁架承载形式的受力性能 11

2.2.2 不同桁架-混凝土组合形式的受力性能 11

2.2.3 不同桁架结构形式的受力性能 12

2.3 FRP桁架-混凝土组合结构的选型 13

第三章 节点设计方法 15

3.1 FRP桁架-混凝土组合结构节点研究意义 15

3.2 节点技术的发展综述 15

3.2.1 FRP复合材料节点连接技术 15

3.2.2 无弦杆的桁架-混凝土组合结构节点连接技术 17

3.3基于复合材料咬合连接的桁架节点研究 18

3.3.1桁架构件节点的作用机理与构造设计 18

3.3.2 径向压应力作用下咬合连接受力性能的理论分析 20

3.3.3 基于试验结果的预紧咬合连接设计方法 27

3.3.4 桁架构件节点研究总结 29

3.4 基于PBL连接的腹杆与混凝土埋置节点研究 29

3.4.1 混凝土与腹杆连接节点的作用机理与构造设计 29

3.4.2 PBL连接件的设计方法 30

3.4.3 PBL-栓钉连接件的设计方法 31

第四章 腹杆设计方法 32

4.1 现有FRP管受压与FRP管约束混凝土受压理论 32

4.1.1 拉挤FRP管材的受压性能 32

4.1.2 FRP管约束混凝土的轴压性能 32

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