| 基于位移控制CFRP板新型锚具锚固性能研究 |
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| 引用本文： | 龙佩恒,史文浩,侯苏伟,焦驰宇,许颢迈.基于位移控制CFRP板新型锚具锚固性能研究[J].中国公路学报,2021,34(5):76-85. |
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| 作者姓名： | 龙佩恒 史文浩 侯苏伟 焦驰宇 许颢迈 |
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| 作者单位： | 1. 北京建筑大学 土木与交通工程学院, 北京 100044;2. 北京建筑大学 北京未来城市设计 高精尖创新中心, 北京 100044;3. 同济大学 土木工程防灾国家重点实验室, 上海 200092 |
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| 基金项目： | 北京市教委科技计划一般项目（KM202010016015）；国家自然科学基金项目（51508019）；北京建筑大学双塔计划-建大英才项目（JDYC20160206）；北京建筑大学市属高校基本科研业务费专项资金项目（X18115，X18091） |
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| 摘 要： | 为探究通过位移控制施加预紧力的CFRP板锚具的锚固性能，明确静载作用下锚具的锚固效率及CFRP板的受力机理，对新型曲面夹持式锚具进行设计，锚具构件由钢制夹板以及限位板组成。夹板通过弧面设计避免端口效应产生的剪切破坏，通过改变限位板厚度，控制夹板挤压位移，以达到调控预紧力的目的。通过8组16次试件锚具静载试验，探究限位板厚度在1.65~2.00 mm，夹板挤压位移在0.30~0.65 mm时CFRP板的锚固效率、应变、变形量、相对滑移以及总位移。结合ANSYS有限元软件，对锚具在不同限位板厚度控制下CFRP板的张拉应力以及锚固效率进行分析，对锚具静载试验进行对比。研究结果表明：锚具静载试验，当夹板挤压位移在0.30~0.45 mm时，破坏形态为滑脱，达到0.5 mm时CFRP板发生纵向劈裂破坏；夹板横向两侧位移0.65 mm时，发生由横向两侧向中部的爆炸式破坏，最大试验锚固效率为89%；夹板挤压位移在0.3~0.65 mm时，CFRP板变形量为1.41~2.95 mm，滑移量在0.7~2.1 mm之间，总位移未超过4 mm，锚固性能越好滑移量越小；有限元模拟最大锚固效率为91%，CFRP板位移对比差值未超过5%。；由于CFRP板回缩及夹板变形带来一定的应力损失，损失大小建议取张拉应力的7.67%；试验同时发现，CFRP板为正交异性板，其横向宽度较大，张拉时受纵向剪应力影响比较大，因此设计时需尽量避免横向出现的挤压应力不均；对CFRP板纵向剪应力进行分析，得到主要影响参数夹板厚度的最优范围在35~40 mm之间。
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| 关 键 词： | 桥梁工程 锚固性能 静载试验 CFRP板锚具 应力损失 滑移 |
| 收稿时间： | 2019-08-26 |
Anchorage Performance of a New Carbon Fiber Board Anchor Based on Displacement Control |
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| LONG Pei-heng,SHI Wen-hao,HOU Su-wei,JIAO Chi-yu,XU Hao-mai.Anchorage Performance of a New Carbon Fiber Board Anchor Based on Displacement Control[J].China Journal of Highway and Transport,2021,34(5):76-85. |
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| Authors: | LONG Pei-heng SHI Wen-hao HOU Su-wei JIAO Chi-yu XU Hao-mai |
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| Affiliation: | 1. School of Civil and Transportation Engineering, Beijing University of Architecture, Beijing 100044, China;2. Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Architecture, Beijing 100044, China;3. State Key Laboratory of Civil Engineering Disaster Prevention, Tongji University, Shanghai 200092, China |
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| Abstract: | In order to explore the anchoring performance of carbon fiber-reinforced polymer (CFRP) plate anchors with preload force through displacement control, the anchoring efficiency of anchors and force mechanism of CFRP plates under static load were studied. Novel curved clamping anchors were designed and anchored in this study. The component is composed of a steel splint and limiting plate. The splint avoids shear damage caused by the port effect through the curved surface design, and controls the clamping displacement of the splint by changing the thickness of the limiting plate to regulate the pre-tightening force. Through 8 groups of 16 specimen anchorage static load tests, the anchorage efficiency, strain, deformation, and relative slip of the CFRP plate were investigated when the thickness of the limit plate was 1.65-2.00 mm and displacement of the splint was 0.30-0.65 mm. Combined with ANSYS finite element software, the tensile stress and anchoring efficiency of CFRP plates under different thickness controls of anchors were analyzed, and the static load tests of the anchors were compared. The results are as follows. In the static load test of anchors, when the displacement of the splint is between 0.30 and 0.45 mm, the failure mode is slippage, and the longitudinal splitting failure of the 0.5-mm CFRP plate occurs. When the lateral displacement of the splint is 0.65 mm, explosive failure occurs in the lateral direction on both sides toward the middle, and the maximum test anchoring efficiency is 89%. When the splint extrusion displacement is 0.3-0.65 mm, the deformation of the CFRP plate is 1.41-2.95 mm, the slip is 0.7-2.1 mm, and the total displacement is no more than 4 mm. The better the anchoring performance, the smaller the slip amount; the maximum anchoring efficiency of the finite element simulation is 91%, and the displacement difference of the CFRP plate does not exceed 5%. Owing to the shrinkage of the CFRP plate and deformation of the anchor, a loss of 7.67% of the tensile stress is recommended. The test also found that the CFRP plate is an orthotropic plate with a large lateral width and is subjected to tension. The longitudinal shear stress has a large influence. In the design, it is necessary to avoid the uneven extrusion stress in the lateral direction. The longitudinal shear stress of the CFRP plate was analyzed, and the optimal range of the main influence plate thickness is 35-40 mm. |
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| Keywords: | bridge engineering anchoring performance static load test carbon fiber board anchorage stress loss slip |
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