Experimental Research on Preload Loss of Stainless Steel High-Strength Bolt Connections
-
摘要: 预紧力松弛规律是高强度螺栓连接的施拧工艺确定和质量检验的重要依据。对喷砂、拉丝、机械刻痕、喷涂抗滑移漆、热轧和镜面6种摩擦面处理工艺下,10组不锈钢高强度螺栓连接标准试件中螺栓预紧力进行了长时间跟踪。结果表明:在终拧完成后预紧力迅速衰退,且随着时间的推移松弛速率逐渐变缓,施拧后1 h的衰退量占总衰退量的50%,24 h后损失趋于平稳;摩擦面抗滑移系数越大,螺栓预紧力松弛也越多。对试验中所有试件的螺栓预紧力松弛规律进行了统计,拟合了松弛规律曲线。结果表明,对于试验中的试件,具有95%保证率的预紧力松弛最终值约为7.2%,该值与同等条件下钢结构高强度螺栓连接相近。基于此,建议不锈钢高强度螺栓连接预紧力检查在终拧6 h后、24 h前完成。Abstract: The law of preload loss is an important basis for determining tightening technology and quality inspection in high-strength bolt connections. The bolt preload of 10 groups of stainless steel high-strength bolted standard specimens was tracked for a long time under six kinds of faying surface treatments, such as the grit blasting, heavy brushing, mechanical scoring, anti-slip coating, hot rolling, and mirror surface. The results showed that the preload decreased rapidly after final tightening, with the loss rate gradually slowing over time. The preload loss within the first hour after the tightening accounted for 50% of the total loss, and the loss stabilized after 24 hours. Larger slip resistance coefficients of the friction surfaces resulted in greater bolt preload loss. The laws of bolt preload loss for all specimens in the test were statistically analyzed and fitted. The results showed that for the specimens in the test, the final loss of preload with a 95% assurance rate was about 7.2%, which was similar to that of high-strength bolted connections in steel structures under the same conditions. Based on the results of this study, it is suggested that the preload inspection of stainless steel high-strength bolt connections should be conducted within 6 to 24 hours after final tightening.
-
Key words:
- stainless steel /
- high-strength bolt connection /
- preload loss /
- experimental research
-
[1] 中国工程建设标准化协会. 不锈钢结构技术规程:CECS 410—2015[S]. 北京:中国计划出版社,2015. [2] 中华人民共和国住房和城乡建设部. 钢结构高强度螺栓连接技术规程:JGJ 82—2011[S]. 北京:中国标准出版社,2011. [3] 王元清,关建,张勇,等. 不锈钢构件螺栓连接摩擦面抗滑移系数试验[J]. 沈阳建筑大学学报(自然科学版),2013,29(5):769-774. [4] 郑宝锋,顾悦言,王嘉昌,等. 不锈钢板摩擦面抗滑移系数试验研究[J]. 建筑结构学报,2021,42(12):154-161. [5] STRANGHÖNER N,AFZALI N,de VRIES P,et al. Slip factors for slip-resistant connections made of stainless steel[J]. Journal of Constructional Steel Research,2019,152:235-245. [6] STRANGHÖNER N,AFZALI N,de VRIES P,et al.. Slip-resistant bolted connections of stainless steel[J]. Steel Construction,2017,10(4):333-343. [7] 王元清,杨璐,关建,等. 不锈钢螺栓应变松弛的长时间试验监测[J]. 沈阳建筑大学学报(自然科学版),2015,31(2):201-208. [8] AFZALI N,PILHAGEN J,MANNINEN T,et al. Preload losses in stainless steel bolting assemblies[J]. Steel Construction,2017,10(4):310-318. [9] AFZALI N,STRANGHÖNER N,PILHAGEN J,et al. Viscoplastic deformation behaviour of preloaded stainless steel connections[J]. Journal of Constructional Steel Research,2019,152:225-234. [10] 施刚,石永久,王元清,等. 钢结构端板连接高强度螺栓应变松弛的试验研究[J]. 施工技术,2003(11):15-17. [11] 施刚,金建钢,傅爱华. 钢结构大六角头高强度螺栓应变松弛分析[J]. 清华大学学报(自然科学版),2010,50(3):342-345. [12] 石永久,施刚,王元清,等. 高强度螺栓应变松弛的长时间试验监测[J]. 施工技术,2004(11):11-13. [13] 王嘉昌,郑宝锋,舒赣平,等. 不锈钢高强度螺栓受力性能试验研究[J]. 建筑结构学报,2021,42(11):195-202. [14] 中国国家标准化管理委员会. 不锈钢和耐热钢 牌号及化学成分:GB/T 20878—2007[S]. 北京:中国标准出版社,2007. -
点击查看大图
计量
- 文章访问数: 55
- HTML全文浏览量: 14
- PDF下载量: 1
- 被引次数: 0
登录
注册
E-alert
登录
注册
E-alert
下载: