| 引用本文: | 胡志坚,姚鹏飞,周知.预制拼装混凝土桥梁连接钢筋粘结锚固性能[J].哈尔滨工业大学学报,2021,53(3):82.DOI:10.11918/202002060 |
| HU Zhijian,YAO Pengfei,ZHOU Zhi.Bonding and anchoring properties of connecting steel bars of prefabricated concrete bridges[J].Journal of Harbin Institute of Technology,2021,53(3):82.DOI:10.11918/202002060 |
|
| 摘要: |
| 为分析预制拼装混凝土桥梁连接钢筋与混凝土之间的粘结锚固性能,以钢筋直径、混凝土强度、锚固长度为试验参数,制作了22个钢筋混凝土拉拔试件进行试验研究,并建立相应的钢筋混凝土粘结界面有限元模型,分析各参数对试件承载力与粘结强度的影响. 基于试验数据和有限元结果,拟合并推导了预制拼装混凝土桥梁连接钢筋的粘结强度计算公式,对比分析国内外规范钢筋锚固长度的相关规定,给出了不同混凝土强度等级条件下装配式混凝土桥梁连接钢筋的基本锚固长度建议值. 结果表明:对于预制拼装构件的连接钢筋,钢筋与混凝土粘结界面承载力与混凝土强度、钢筋直径和锚固长度呈正相关；界面粘结强度与混凝土强度呈正相关,与钢筋直径呈负相关,与锚固长度关联度较小,在计算其粘结强度时可以不考虑锚固长度和保护层厚度的影响. |
| 关键词: 钢筋混凝土界面 有限元参数化分析 粘结强度 装配式设计施工 锚固长度 |
| DOI：10.11918/202002060 |
| 分类号:U443.22 |
| 文献标识码:A |
| 基金项目:国家重点研发专项(2017YFC0806000); 江西省创新驱动“5511”项目(20165ABC28001)； 江西省交通科技项目(2017C0005) |
|
| Bonding and anchoring properties of connecting steel bars of prefabricated concrete bridges |
|
HU Zhijian,YAO Pengfei,ZHOU Zhi
|
|
(School of Transportation, Wuhan University of Technology, Wuhan 430063, China)
|
| Abstract: |
| To analyze the bonding and anchoring performance of the connecting steel bars of prefabricated concrete bridges and concrete, the steel bar diameter, concrete strength, and anchorage length were taken as test parameters, and 22 pullout test pieces were fabricated for experimental research. The finite element model of the reinforced concrete bonding interface was constructed to analyze the influence of various parameters on the bearing capacity and bonding strength of the test pieces. Based on the experimental data and finite element results, the bonding strength calculation formulas for the connecting steel bars of prefabricated reinforced concrete bridges were fitted and derived. The relevant regulations of domestic and foreign standards for the anchorage length of steel bars were compared and analyzed, and the recommended value for the basic anchorage length of connecting steel bars of prefabricated concrete bridges under different concrete strength levels was given. Results show that for the connecting steel bars of prefabricated components, the bearing capacity of the interface between steel bar and concrete had positive relations with concrete strength, steel bar diameter, and anchorage length. The interface bonding strength was positively correlated with concrete strength, negatively correlated with steel bar diameter, and had little relation with anchorage length. The influence of the anchorage length and the thickness of the protective layer can be ignored when calculating bonding strength. |
| Key words: reinforced concrete interface parametric finite element analysis bonding strength assembled design and construction anchorage length |
