功能梯度混凝土受弯构件形成机制和力学性能研究

邓江东; 彭展翼

doi:10.6052/j.issn.1000-4750.2022.01.0021

功能梯度混凝土受弯构件形成机制和力学性能研究

doi: 10.6052/j.issn.1000-4750.2022.01.0021

邓江东^,,
彭展翼

广州大学土木工程学院，广州 510006

基金项目: 国家自然科学基金项目(51978183)

详细信息

作者简介:
彭展翼(1993−)，男，广东人，博士生，主要从事结构抗震研究(E-mail: Pengzhanyi@e.gzhu.edu.cn)

通讯作者:
邓江东(1979−)，男，山东人，研究员，博士，博导，主要从事结构抗震研究(E-mail: jddeng@gzhu.edu.cn)

中图分类号: TU311
计量
- 文章访问数: 262
- HTML全文浏览量: 59
- PDF下载量: 80
- 被引次数: 0
出版历程
- 收稿日期: 2022-01-05
- 修回日期: 2022-04-18
- 网络出版日期: 2022-05-06
- 刊出日期: 2023-09-06

FORMULATION MECHANISM AND MECHANICAL PERFORMANCE OF FUNCTIONALLY GRADED FLEXURAL CONCRETE MEMBERS

DENG Jiang-dong^,,
PENG Zhan-yi

Civil Engineering College, Guangzhou University, Guangzhou 510006, China

摘要

摘要: 基于理论分析提出了一种功能梯度混凝土受弯构件，通过梯级FRP筋+钢筋混合配筋，构建同地震弯矩分布梯度相适应的构件抗弯承载能力分布梯度，使多个功能梯度段进入塑性状态，以更充分利用构件的抗震能力。功能梯度可以有效控制构件塑性的分布和发展程度，确保发生延性的破坏模式，并实现较好的损伤自恢复性。功能梯度混凝土受弯构件的变形能力大幅提高，侧向承载力增大，极限刚度降低，抗震性能显著增强。模型试验证明了功能梯度混凝土受弯构件理念的可行性及其力学效果，也验证了所提功能梯度构建方案的有效性和工程实用性。
- 功能梯度混凝土受弯构件 /
- 形成机制 /
- 力学性能 /
- 理论分析 /
- 模型试验
Abstract: Based on a theoretical analysis, a new functionally graded flexural concrete member (FGFCM) is proposed. Through the combined reinforcement of graded FRP bars and steel bars, the distribution gradient of the flexural load-bearing capacity along the member is adapted to the load distribution gradient. Then multiple functionally graded segments in the FGFCMs reach their plastic state, and the functional gradient is formed to more utilize the seismic capacity of the members. The distribution and development degree of the plasticity in the FGFCMs can be effectively controlled to achieve the ductile failure mode and better recoverability. The functional gradient greatly improves the deformation capacity, increases the lateral bearing capacity, reduces the ultimate stiffness, and enhances the seismic performance of the members. The model experiment proved the feasibility of the FGFCMs and their mechanical effects, and verified the effectiveness and engineering practicability of the proposed construction scheme to form the functional gradient.
- functionally graded flexural concrete members /
- formation mechanism /
- mechanical performance /
- theoretic analysis /
- model experiment

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图 1 截面的弯矩-曲率关系

Figure 1. The bending moment-curvature relationship of the sections

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图 2 抗弯功能梯度的形成条件

Figure 2. Formation conditions of the flexural functional gradient

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图 3 各功能梯度段底截面塑性发展过程

Figure 3. The development process of section curvature in functionally graded segments

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图 4 梯级数量对构件性能的影响

Figure 4. The influence of the number of functionally graded segments on the mechanical performance

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图 5 各试件配筋方案 /mm

Figure 5. Reinforcement plan of each specimen

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图 6 试验加载方式

Figure 6. Test loading method

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图 7 试件破坏形态

Figure 7. Failure modes of the specimens

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图 8 各试件裂缝宽度分布

Figure 8. Crack width distribution of each specimen

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图 9 试件侧向力-变形曲线

Figure 9. Lateral force-deformation curves of specimens

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表 1 试件关键对比参数

Table 1. Key comparison parameters of specimens

试件名称	试件类型	功能梯度梯级个数	梯级序号	各梯级底端距构件固结端的距离/m	纵筋配置	配筋率/(%)
试件名称	试件类型	功能梯度梯级个数	梯级序号	各梯级底端距构件固结端的距离/m	纵筋配置	钢筋	FRP筋
试件A	传统钢筋混凝土构件	−	−	0.00	4 16 mm钢筋	1.29	−
试件B	功能梯度构件	2个梯级	1^st	0.00	4 14 mmGFRP筋+4 16 mm钢筋	1.29	0.98
试件B	功能梯度构件	2个梯级	2^nd	0.70	4 16 mm钢筋	1.29	−
试件C	功能梯度构件	3个梯级	1^st	0.00	10 6 mmCFRP筋+4 16 mm钢筋	1.29	0.45
			2^nd	0.50	6 6 mmCFRP筋+4 16 mm钢筋	1.29	0.27
			3^rd	0.85	4 16 mm钢筋	1.29	−

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表 2 材料性能实测值

Table 2. Measured values of material performance

材料	力筋直径/ mm	圆柱体抗压强度/MPa	屈服强度/ MPa	极限强度/ MPa	极限应变
混凝土	−	48.5	−	−	−
钢筋	16	−	477.5	621.0	−
GFRP筋	14	−	−	498.6	0.0195
CFRP筋	6	−	−	2213.8	0.0176

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表 3 试件关键力学性能

Table 3. Key mechanical performance of specimens

试件编号	形成塑性铰的个数	侧向承载力/ kN	极限位移/ mm	极限刚度/ (kN/mm)
A	1	16.8	92.6	0.161
B	2	20.2	202.3	0.100
C	3	21.4	230.1	0.093

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