BTRC加固砖墙平面内抗剪力学性能及其增强机理研究

杨佩剑; 田稳苓; 卿龙邦; 李鑫波

doi:10.6052/j.issn.1000-4750.2022.01.0114

BTRC加固砖墙平面内抗剪力学性能及其增强机理研究

doi: 10.6052/j.issn.1000-4750.2022.01.0114

杨佩剑^1,,
田稳苓^1,,
卿龙邦^1, ,,
李鑫波^{2, 3,}

1.
河北工业大学土木与交通学院，天津 300401
2.
大连理工大学建设工程学部，辽宁，大连 116024
3.
海岸和近海工程国家重点实验室，大连理工大学，辽宁，大连 116024

基金项目: 国家自然科学基金项目(52022027)；河北省高层次人才资助项目(A202101011)

详细信息

作者简介:
杨佩剑(1990−)，男，河北涉县人，博士生，主要从事TRC加固砌体结构研究(E-mail: 13132276339@163.com)

田稳苓(1961−)，女，河北大城人，教授，博士，博导，主要从事新型材料、新型结构和结构加固研究(E-mail: wltian126@126.com)

李鑫波(1995−)，男，四川成都人，博士生，主要从事TRC加固砌体结构研究(E-mail: xinboli727@163.com)

通讯作者:
卿龙邦(1982−)，男，湖北天门人，教授，博士，博导，主要从事混凝土断裂与损伤力学研究(E-mail: qing@hebut.edu.cn)

中图分类号: TU364
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- HTML全文浏览量: 47
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- 被引次数: 0
出版历程
- 收稿日期: 2022-01-23
- 修回日期: 2022-07-08
- 网络出版日期: 2022-11-01
- 刊出日期: 2023-11-25

STUDY ON IN-PLANE SHEAR MECHANICAL PROPERTIES AND REINFORCEMENT MECHANISM OF BRICK WALL REINFORCED WITH BTRC

YANG Pei-jian^1
,,
TIAN Wen-ling^1
,,
QING Long-bang^{1
, ,},
LI Xin-bo^{2, 3
,}

1.
School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
2.
Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China
3.
State Key Laboratory of Costal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China

摘要

摘要: 为研究玄武岩纤维编织网增强混凝土(BTRC, basalt textile reinforced concrete)加固砖墙的抗剪性能及其增强机理，对BTRC加固砖墙进行了对角剪切试验研究，考察了单双侧加固、纤维编织网层数以及砌筑砂浆强度对抗剪性能提升效果的影响。试验结果表明：BTRC与砖墙协同工作良好，墙体的抗剪强度、刚度及变形能力显著提高；相同纤维编织网层数下，双侧加固优于单侧；随着纤维编织网层数的增加，双侧加固效果逐渐提升，而单侧加固效果无明显变化；对于低强度砂浆砌筑的墙体，BTRC亦可将墙体的灰缝滑移破坏模式转变为具有多缝开裂特征的对角拉伸破坏，加固效果显著。结合试验结果分析了BTRC加固砖墙受剪破坏过程的受力特征，提出了约束增强机理。基于试验结果和增强机理对BTRC加固砖墙的抗剪承载力计算方法进行了研究。
- 玄武岩纤维编织网增强混凝土 /
- 加固 /
- 砖墙 /
- 抗剪性能 /
- 增强机理
Abstract: In order to study the shear behavior and reinforcement mechanism of brick wall reinforced with basalt textile reinforced concrete (BTRC), the diagonal shear tests have been carried out on BTRC reinforced walls, and the effects of single-side vs. double-side reinforcement, the number of textile layers and the strength of masonry mortar on the improvement of shear resistance have been investigated. The test results show that the BTRC and brick wall work well together, and the shear strength, stiffness and deformation capacity of brick wall are significantly improved; under the same number of textile layers, double-side reinforcement has better effect than single-side reinforcement; with the increase of the number of textile layers, the reinforcement effect of double-side is gradually improved, while the reinforcement effect of single-side changes little; for brick walls built with low strength mortar, the BTRC also transforms the failure mode of slip cracking of mortar joint into diagonal tensile failure with multi-joint cracking characteristics, and the reinforcement effect is remarkable. The mechanical characteristics of BTRC reinforced brick wall were analyzed, and the restraint reinforcement mechanism was put forward. Based on the test results and the reinforcement mechanism, the calculation method of shear capacity of brick wall reinforced with BTRC was studied.
- basalt textile reinforced concrete /
- strengthening /
- brick wall /
- shear behavior /
- strengthening mechanism

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图 1 玄武岩纤维编织网

Figure 1. Basalt textile

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图 2 对角剪切试验装置

Figure 2. Test apparatus for diagonal shear

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图 3 A类砂浆砌筑墙体破坏形态

Figure 3. Failure mode of masonry wall with A mortar

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图 4 B类砂浆砌筑墙体破坏形态

Figure 4. Failure mode of masonry wall with B mortar

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图 5 剪应力-应变曲线

Figure 5. Shear stress-strain curve

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图 6 有效刚度平均值

Figure 6. Average value of effective stiffness modulus

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图 7 等效双线性模型

Figure 7. Equivalent bilinear model

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图 8 BTRC加固砌体对角剪切破坏特征

Figure 8. Diagonal shear failure characteristics of masonry reinforced with BTRC

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表 1 砖块和砌筑砂浆抗压强度

Table 1. Compressive strength of brick and masonry mortar

材料	抗压强度/MPa	变异系数/(%)
烧结砖	6.88	23.1
A类砂浆	10.91	13.0
B类砂浆	5.87	10.6

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表 2 玄武岩纤维编织网力学性能

Table 2. Mechanical properties of basalt textile

纤维方向	抗拉强度/ MPa	弹性模量/ GPa	极限应变/ (%)	纤维束理论面积/mm²
纬向	1641.76	75.31	2.18	0.188
经向	1243.99	55.78	2.23	0.188
注：纤维束的理论截面面积(A_f)公式为：A_f=T_ex/D_f，其中，T_ex为纤维束线密度，由厂家提供，528 g/1000 m；D_f为纤维束的密度，由厂家提供，2.8 g/cm³。

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表 3 BTRC基体配合比

Table 3. BTRC matrix mix proportion

材料	P.O 42.5	粉煤灰	硅灰	细砂	粗砂	减水剂	水
含量/(kg·m⁻³)	472	168	35	460	920	4.4	262

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表 4 试件参数

Table 4. Parameters of specimen

试件组	砂浆类型	加固形式	纤维编织网层数
UA	A类	未加固	—
TA1	A类	单侧加固	1
TA2	A类	单侧加固	2
TA3	A类	双侧加固	1
TA4	A类	双侧加固	2
UB	B类	未加固	—
TB	B类	双侧加固	1

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表 5 试验结果

Table 5. Results of tests

试件组	试件编号	开裂荷载/ kN	开裂应变/ (%)	峰值荷载/ kN	峰值荷载对应应变/(%)	抗剪强度/ MPa	抗剪强度平均值/MPa	抗剪强度提高率/(%)	屈服应变/ (%)	极限应变/ (%)	延性系数
UA	UA-1	−	−	132.05	−	0.79	0.83	对比组	−	−	1.00
UA	UA-2	−	−	144.18	−	0.87	0.83	对比组	−	−	1.00
TA1	TA1-1	140.93	0.049	201.33	0.142	1.21	1.25	50.64	0.069	0.217	3.14
TA1	TA1-2	150.34	0.046	214.77	0.158	1.29	1.25	50.64	0.068	0.289	4.24
TA2	TA2-1	145.54	0.050	207.92	0.182	1.25	1.30	56.67	0.077	0.269	3.49
TA2	TA2-2	157.39	0.057	224.84	0.172	1.35	1.30	56.67	0.073	0.373	5.11
TA3	TA3-1	186.87	0.047	266.96	0.201	1.60	1.57	89.06	0.064	0.444	6.93
TA3	TA3-2	178.70	0.051	255.28	0.191	1.53	1.57	89.06	0.070	0.45	6.47
TA4	TA4-1	214.66	0.061	306.65	0.173	1.84	1.87	124.71	0.071	0.85	11.97
TA4	TA4-2	219.86	0.049	314.08	0.376	1.89	1.87	124.71	0.065	0.88	13.48
UB	UB-1	−	−	115.66	−	0.70	0.65	对比组	−	−	1.00
UB	UB-2	−	−	99.89	−	0.60	0.65	对比组	−	−	1.00
TB	TB-1	151.05	0.039	215.78	0.143	1.30	1.24	92.01	0.055	0.285	5.22
TB	TB-2	138.66	0.042	198.09	0.148	1.19	1.24	92.01	0.061	0.421	6.91

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表 6 试验值和计算值对比

Table 6. Comparison between calculated value and test value

试件组	砌体贡献值 V_m/kN	加固层贡献值 V_f/kN	计算值 (V_m+V_f)/kN	试验值/kN
TA3	16.1	11.1	27.2	261.1
TA4	16.1	22.1	38.2	310.4
TB	12.7	11.1	23.8	206.9

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表 7 初步优化后计算值

Table 7. Calculated value after preliminary optimization

试件组	初步优化后砌体贡献值 $V_{\rm{m}}' $/kN	初步优化后加固层贡献值 $ {V'_{\text{f} } } $/kN	初步优化后计算值 ($ V'_{\rm{m} }+{V'_{\text{f} } } $)/kN	试验值/kN
TA3	80.9	60.5	141.4	261.1
TA4	80.9	120.4	201.3	310.4
TB	71.4	60.5	131.9	206.9

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表 8 优化后计算值与试验值对比

Table 8. Comparison between calculated value and test value after optimization

试件组	优化后计算值/kN	试验值/kN	优化后计算值/试验值
TA3	258.7	261.1	0.991
TA4	307.1	310.4	0.989
TB	196.9	206.9	0.952

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