| 引用本文: | 余琼,白汶鑫,唐子鸣,郭霖,范宝秀,张志,陈振海.套筒灌浆搭接及对接接头高应力反复拉压试验[J].哈尔滨工业大学学报,2024,56(1):151.DOI:10.11918/202308027 |
| YU Qiong,BAI Wenxin,TANG Ziming,GUO Lin,FAN Baoxiu,ZHANG Zhi,CHEN Zhenhai.Mechanical test of grouted sleeve lapping connector and butt connector under high stress repeated tension-compression loading[J].Journal of Harbin Institute of Technology,2024,56(1):151.DOI:10.11918/202308027 |
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| 套筒灌浆搭接及对接接头高应力反复拉压试验 |
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余琼1,白汶鑫1,唐子鸣1,郭霖2,范宝秀2,张志3,陈振海3
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(1.同济大学 土木工程学院,上海 200092;2.山西建筑工程集团有限公司,太原 030006; 3.山西二建集团有限公司,太原 030013)
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| 摘要: |
| 为比较套筒灌浆搭接及对接接头间力学性能差异,进行了41个搭接接头和20个对接接头的单拉及高应力反复拉压试验。结果表明:单拉及高应力反复拉压时,两种接头均能实现最大力下总伸长率大于6%、延性系数大于4,强度基本满足规范要求；高应力反复拉压后单拉时,两种接头承载力均有所提高,但接头初始刚度和延性下降；防偏转措施可减少搭接接头残余变形,但其约束刚度有限,搭接接头残余变形略大于对接接头,防偏转搭接接头及对接接头残余变形基本满足规范要求；高应力反复拉压后单拉时,搭接接头套筒中部截面在加载前期纵向受拉、环向受压,加载后期纵向受压、环向受拉,对接接头套筒加载过程中均为纵向受拉、环向受压；高应力反复拉压结束后单拉时,防偏转、不防偏转搭接接头套筒中部截面近钢筋侧最大纵向拉应变分别为对接接头的0.10~0.39倍、0.13~0.18倍,最大环向压应变分别为对接接头的0.09~0.49倍、0.02~0.32倍,搭接接头对套筒材性要求较低；钢筋直径相同时搭接接头材料成本较对接接头降低约35%。 |
| 关键词: 搭接接头 对接接头 单向拉伸 高应力反复拉压 防偏转 |
| DOI：10.11918/202308027 |
| 分类号:TU375 |
| 文献标识码:A |
| 基金项目:上海市科技计划项目(21ZR1468300) |
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| Mechanical test of grouted sleeve lapping connector and butt connector under high stress repeated tension-compression loading |
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YU Qiong1,BAI Wenxin1,TANG Ziming1,GUO Lin2,FAN Baoxiu2,ZHANG Zhi3,CHEN Zhenhai3
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(1.College of Civil Engineering, Tongji University, Shanghai 200092, China; 2.Shanxi Construction Engineering Group Co. Ltd., Taiyuan 030006, China; 3.Shanxi Erjian Group Co. Ltd., Taiyuan 030013, China)
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| Abstract: |
| In order to compare the mechanical performance differences between grouted sleeve lapping connectors and butt connectors, uniaxial tensile and high stress repeated tension-compression tests were conducted on 41 lap connectors and 20 butt connectors. Results showed that under uniaxial tension and high stress repeated tension-compression loading, the total elongation ratio with maximum force of two kinds of connectors was greater than 6% and the ductility coefficient was greater than 4. The strength basically met the requirements of the codes. Under uniaxial tension after high stress repeated tension-compression, the bearing capacity of both connectors increased, while the initial stiffness and ductility of the specimens decreased. Moreover, the residual deformation of the lap connector was reduced by the anti-deflection measures, but the measured value of the residual deformation of the lap connector was slightly larger than that of the butt connector due to the limited constraint stiffness of the anti-deflection measures. However, the residual deformation of the lap connector and the butt connector of anti-deflection generally met the requirements of the specification. After high stress repeated tension-compression, during uniaxial tension testing, the middle section of the sleeve of the lap connector was longitudinally compressed and circumferentially stretched in the early stage of loading. In the later stage of loading, it experienced longitudinal stretch and circumferential compression, while the sleeve of the butt connector was longitudinally stretched and circumferentially stretched throughout the loading process. In the case of uniaxial tension after high stress repeated tension-compression, the maximum longitudinal tensile strain of the middle section of the sleeve near the bar side of the anti-deflection and non-deflection lap connector was 0.10 to 0.39 times and 0.13 to 0.18 times of the butt connector, respectively. Furthermore, the maximum circumferential compressive strain was 0.09 to 0.49 times and 0.02 to 0.32 times of the butt connector, respectively, which indicated that the lap connector had relatively low requirements on the material of the sleeve. When the diameter of rebar was the same, the material cost of the lap connector was about 35% lower than that of the butt connector. |
| Key words: grouted sleeve lapping connector grouted sleeve butt connector uniaxial tension high stress repeated tension and compression anti-deflection |
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