摘要
为研究波纹钢腹板PC组合箱梁中所使用的Twin-PBL剪力键的抗剪承载能力,明确剪力键与混凝土之间在加载全过程中的变形协调关系,采用静载推出试验方法,完成了4组8个Twin-PBL剪力键试件的试验研究。结果表明,当开孔钢板孔径为30mm时,随着贯穿钢筋直径从14mm增大至16mm,剪力键的抗剪承载能力有显著提高;当贯穿钢筋直径为16mm时,随着开孔孔径从30mm减少至20mm,剪力键的抗剪承载能力明显下降;开孔钢板厚度对剪力键的抗剪承载能力影响不大。各试件的荷载-滑移趋势具有相似性,且表现出良好的延性,剪力键开孔钢板的孔间传力符合加载受力的传递机理。通过国内外学者推荐的承载力公式计算值与此次试验的实测值对比,发现部分推荐公式高估了Twin-PBL剪力键的承载能力。因此,提出了一个新的抗剪承载力计算公式,能够为剪力键的设计安全性提供理论参考。
In order to research the bearing capacity of Twin-PBL shear connectors which are widely used in PC compos- ite box girder with corrugated steel webs, clarifying the coordinated relations of deformation between shear connectors and concretes during whole loading process, eight Twin-PBL shear connector models were made and experimented in push- out test. The results show that, When the size of holes on steel plate is 30 mm, the bearing capacity of connectors has sig nifieantly development with the diameter of reinforced-throughout increases from 14 mm to 16 mm. when the diameter of reinforced-throughout is 16mm, the bearing capacity of connectors has apparently decline with the size of holes on steel plate decreases from 30 mm to 20mm. The thickness of steel plate has little influence to the bearing capacity of connec- tors. All specimens＇ load slip curves get a similar trend and show a good ductility, the load transfer mechanism between holes on steel plate is reasonably. Through the contrast between calculated results and measured results, some formulae which are recommended by domestic and overseas scholars overestimate the hearing capacity of connector. Thus, a new formula is proposed which can estimate the test results well and provide theoretical references for design safety of Twin- PBL shear connector.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2013年第8期98-102,123,共6页
Journal of Wuhan University of Technology
基金
国家交通运输部建设科技项目(2011318812970)
陕西省自然科学基金(2012JQ7004)
