CFRP网格修复后多层砌体结构墙体的抗震性能

陶毅; 古金本; 信任; 姚继涛

doi:10.3969/j.issn.0258-2724.20170491

CFRP网格修复后多层砌体结构墙体的抗震性能

doi: 10.3969/j.issn.0258-2724.20170491

基金项目: 国家自然科学基金资助项目（51408478，51561135004，51508456）；中国博士后基金资助项目（2015M572529）

详细信息

作者简介:
陶毅（1982—），男，副教授，研究方向为高性能建筑材料应用，E-mail：y.tao@xauat.edu.cn

通讯作者:
信任（1983—），男，副教授，研究方向为结构抗震与减震加固工程，E-mail：xinren@xauat.edu.cn

中图分类号: TU364
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出版历程
- 收稿日期: 2017-07-10
- 修回日期: 2018-04-23
- 网络出版日期: 2018-05-22
- 刊出日期: 2019-12-01

Seismic Performance of Multi-storey Masonry Wall Repaired by Carbon Fiber Reinforced Polymer Grids

摘要

摘要: 为了研究碳纤维增强复合材料（CFRP）网格加固砌体结构的破坏机理及加固效果，通过拟静力试验将一片3层砌体开洞墙体加载至破坏，在破坏集中区域单面粘贴CFRP网格进行加固之后再次进行拟静力试验，以最小加固量为指标对加固前后墙体的抗震性能进行了对比分析，并提出了相应的加固建议. 研究结果表明：采用CFRP网格修复可以有效地阻止和延缓墙体受剪斜裂缝的出现及开展，从而提升了墙体的抗震性能，若以抗剪承载力完全恢复为指标，建议最小修复面积为22%；修复后墙体的破坏模式与修复位置相关，本试验以CFRP网格剥离及窗间墙破坏为主，破坏由低至高逐层发生，同层墙肢范围内，由未修复区向修复区发展；考虑窗间墙破坏易引起结构整体破坏和倒塌，因此应优先修复剪力较大层的窗间墙区域，并提供必要的加强措施.
- 多层砌体结构 /
- 碳纤维增强复合材料（CFRP）网格 /
- 抗震修复 /
- 拟静力试验
Abstract: To study the failure mechanism and repair effect of plain masonry structure repaired by carbon fiber reinforced polymer (CFRP) grids, firstly, a three-storey masonry wall with openings was destroyed under the pseudo-static action, then, the areas where the cracks intensively occurred in destroyed masonry wall were repaired by CFRP grids, at last, the pseudo-static action was retested. The seismic performances of the masonry wall prior to and after repair were compared according to the lower limit of repair requirements, and the repairing suggestions were proposed. The results show that CFRP grids can effectively retard or prevent the occurrence of masonry shear diagonal cracks, and then the seismic resistance of masonry walls is developed. The lower limit of repair area is 22% when the shear bearing capacity fully restored is the indicator. The failure modes of the walls after repaired are related to the repair positions, the CFRP grids debonding and piers failure are the majority failure modes of the test. The failures initiate layer by layer from low to high, and develop from the unrepaired to the repaired zones on the same floor. The piers failure is most likely to cause the structure failure or even collapse, therefore, CFRP grids need to be preferentially applied to the piers where the shear stress is relative large, the additional strengthening measures are also essential.
- masonry structure /
- carbon fiber reinforced polymer (CFRP) grid /
- seismic repairing /
- peseudo static test

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图 1 多层砌体开洞墙体模型

Figure 1. Description of multi-storey unreinforced masonry wall with openings

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图 2 试验加载装置

Figure 2. Test setup

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图 3 试验加载方式

Figure 3. Loading method

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图 4 量测系统

Figure 4. Measuring system

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图 5 URM墙体最终破坏情况

Figure 5. URM wall at the test end

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图 6 CFRP网格加固震损墙体

Figure 6. URM wall repaired by CFRP grids

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图 7 加固墙体最终破坏情况

Figure 7. CRM wall at the test end

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图 8 加固墙体细部破坏情况

Figure 8. Failure of the CRM wall

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图 9 墙体滞回曲线

Figure 9. Hysteresis curves of wall

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图 10 骨架曲线

Figure 10. Skeleton curves

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图 11 墙体各层刚度退化

Figure 11. Rigidity degeneration of each floor

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图 12 墙体整体实际骨架及理想骨架曲线

Figure 12. Idealized and actual skeleton curves of masonry walls

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图 13 墙体各层耗能

Figure 13. Energy dissipation of each floor

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图 14 墙体层间位移角

Figure 14. Layer displacement angles of walls

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表 1 砌体抗压强度

Table 1. Compressive strength of masonry wall MPa

材料	抗压强度
砂浆	8.6
黏土砖	17.8
混凝土立方体	35.6

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表 2 材料性能

Table 2. Material properties

材料	抗拉强度/MPa	弹性模量/GPa	厚度/mm	断裂伸长率/%
CFRP网格	4 300	240.0	0.047	1.49（X 方向），1.50（Y 方向）
CFRP布	4 153	242.0	0.167	1.72
环氧树脂胶	30	4.5		0.90

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