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Supervised by Ministry of Industry and Information Technology of The People''s Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:Qiu Zhao,Yang Du,Wenping Cai,Ming Yang,Rui Dong.Experimental Study on Shear Behavior of New-Type Steel-Concrete Composite Bridge Deck[J].Journal of Harbin Institute Of Technology(New Series),2018,25(6):66-77.DOI:10.11916/j.issn.1005-9113.18026.
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Experimental Study on Shear Behavior of New-Type Steel-Concrete Composite Bridge Deck
Qiu Zhao, Yang Du, Wenping Cai, Ming Yang,Rui Dong
(College of Civil Engineering, Fuzhou University, Fuzhou 350108, China)
Abstract:
To alleviate deck fatigue failure and regular pavement damage, which are congenital deficiencies of highway steel bridge deck structure, this paper proposes a new type of composite bridge deck, consisting of steel tubular connectors and steel-reactive powder concrete (RPC). Push-out tests were conducted to study the new deck's shear performance. During the experimental process, specimens were divided into two groups which are composed of steel tubular connectors with or without penetrative bars set in. Then, researchers analyzed destroyed models and mechanisms of the composite structure under shear forces. Results showed that test models in two groups, once destroyed, displayed similar shear fracture, which appeared on the lower margin of the steel tubular wall along the welds. Meanwhile, RPC under the connector, for varied tests, was crushed at the same stage, although the large shear and bending deformation just occurred on connectors with penetrative bars. Additionally, shear capacity of specimens with penetrative bars, compared with the ones without bars, unexpectedly decreased by 20%, but the structural ductility was 1.75 times as much, and the ductility coefficients of specimens were all larger than 3.5, demonstrating certain deformation capacity.
Key words:  composite bridge deck  push-out tests  RPC  steel tubular connectors  failure mode
DOI:10.11916/j.issn.1005-9113.18026
Clc Number:TU997
Fund:
Descriptions in Chinese:
  

新型钢-混凝土组合桥面板抗剪性能的试验研究

赵秋,杜阳,蔡文平,杨明,董锐

(福州大学 土木工程学院,福州 350108)

创新点说明:

1)活性粉末混凝土力学性能优越,厚度一般为4~6 cm,去掉保护层后极短的栓钉较难提供足够的拉拔力,从而会降低该组合桥面板的使用效率和耐久性,且其它传统的截面高度较大的连接件在空间分布及受力性能上仍需考究。因此本文提出一种既能够布置在超薄RPC板中,同时也能够提高拉拔力的钢管抗剪连接件。

2)新型桥面板构造工作机理:利用管内活性粉末混凝土和贯通钢筋所起的销栓作用在界面提拱有效的抗拉拨和抗剪力。同时钢管侧壁薄,贯穿短钢管连接件的钢筋能最大限度的布置在RPC层的顶部,充分发挥钢筋网在RPC层中作用。

研究目的:

提出一种既能够满足布置在超薄RPC板中,同时也能够提高拉拔力的钢管抗剪连接件。

研究方法:

1)本文对钢管连接件进行推出试验,探索钢管连接件在钢-RPC组合桥面板中抗剪受力性能。

2)以钢管连接件是否贯穿钢筋为控制变量,抗剪试验共设计2组试件,每组包含3个试件。

3)为保证均匀加载及更好的获取下降段,采用微机控制电液伺服压剪试验机进行加载。

结果:

1)未贯穿钢筋的钢管连接件组合桥面板推出试件,在界面剪力作用下,钢管下方混凝土较大面积被压碎,钢管焊缝根部全截面屈服断裂,最终钢管内与管外混凝土产生剪切断裂,钢管携管内混凝土被拔出。

2)贯穿钢筋的钢管连接件组合桥面板推出试件,在界面剪力作用下,管内钢筋阻止钢管与混凝土的相对滑移,使得管内钢筋被拉拔发生屈服变形。随着相对滑移值增加,钢管内外RPC被压碎,最后钢管下缘被剪切断裂。

3)贯穿钢筋的钢管连接件相比未贯穿钢筋的钢管连接件的抗剪承载力降低约20%,屈服抗剪承载力降低21.4%,弹性阶段的抗剪刚度降低8.6%。钢筋网贯穿钢管连接件后对构件延性提高非常明显,延性系数提高1.75倍。

结论:

1)两组试件的延性系数均大于3.5,说明钢管连接件具有良好的耗能能力。

2)两组钢管连接件破坏模式均表现为下缘焊缝附近的钢管剪切断裂,该部位为该连接件受力最薄弱区域。

3)为便于钢管内RPC 填充密实,钢管长度宜设置为40~80 mm。

关键词:组合桥面板,推出试验,RPC,钢管剪力连接件,破坏模式

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