角钢连接件力学性能及混凝土脱空对其影响研究  

EXPERIMENTAL STUDY ON THE MECHANICAL PERFORMANCE OF ANGLE SHEAR CONNECTORS WITH AND WITHOUT CONCRETE GAPS

作　　者：唐亮[1] 樊健生[2,3] 聂建国 邱盛源[2,3] 徐国平 宋神友 TANG Liang;FAN Jian-sheng;NIE Jian-guo;QIU Sheng-yuan;XU Guo-ping;SONG Shen-you(CCCC Highway Consultants Co.,Ltd.Beijing 100088,China;Key Laboratory of Structural Engineering and Vibration of China Education Ministry,Tsinghua University,Beijing 100084,China;Beijing Engineering Research Center of Steel and Concrete Composite Structures,Tsinghua University,Beijing 100084,China;Guangdong Highway Design Institute Co.,Ltd.,Guangzhou,Guangdong 510507,China)

机构地区：[1]中交公路规划设计院有限公司,北京100088 [2]清华大学土木工程安全与耐久教育重点试验室,北京100084 [3]北京市钢与混凝土组合结构工程技术研究中心,北京100084 [4]广东省公路勘察规划设计院,广州510507

出　　处：《工程力学》2020年第10期45-55,115,共12页Engineering Mechanics

基　　金：国家重点研发项目(2018YFC0809600,2018YFC0809602);国家杰出青年基金项目(51725803)。

摘　　要：对于采用角钢连接件的钢壳沉管隧道结构,上翼缘板和角钢相连部位不利于混凝土流通、振捣和排气,浇筑时易产生混凝土脱空现象。基于实际工程和规范建议设计了9组足尺推出试件,包含3种脱空深度(0 mm、10 mm及20 mm)。为了减少试验本身的离散性,每组均有3个试件,共计27个试件。试验中所有试件均发生混凝土压溃破坏,相比于无脱空试件,脱空试件的混凝土压溃区域更小且角钢变形更大。相比于无脱空试件,脱空深度为10 mm和20 mm时,连接件的承载力折减可达16.5%和37.5%,刚度折减可达48.4%和70.6%。比对文献中62组试件以及文中3组试件的试验结果发现,Kiyomiya和Kimura提出的回归公式具有较高的准确度和较小的离散性,日本《钢-混凝土三明治结构设计指南》的公式则比较保守;此外基于现有试验数据通过参数回归的方式,提出了新的角钢连接件承载力计算公式,该公式具有更好的精度和适用性。在该文中提出的回归公式和混凝土脱空力学模型的基础上,提出了考虑混凝土脱空的角钢连接件承载力修正公式,通过文献中3组试件及该文6组试件进行验证,结果表明该修正公式具有较高的准确度和较小的离散性。Because it is difficult for the flow,vibration and gas exhaust of concrete,gaps may exist near the welded regions of angle shear connectors.Based on the engineering practice and standard provisions,a test on nine groups of full-scale push-out specimens of three different gap depths(0,10 mm and 20 mm)was conducted.To reduce the discreteness,there were three duplicate specimens in each group.All specimens failed in concrete crushing in the test.Compared with the specimens without a gap,the crushing area was smaller and the deformation of the angle steel was larger in the specimens with a gap.The concrete gap had a significant influence on the strength and stiffness of the angle shear connectors.Compared with that of the specimens without a gap,the strength was decreased by 16.5%and 37.5%and the stiffness was decreased by 48.4%and 70.6%for the specimens with a gap of 10 mm and 20 mm,respectively.Different formulas in the literature were verified based on 62 groups of specimens in other papers and 3 groups of specimens in the current test.The formula proposed by Kiyomiya and Kimura was found to have good accuracy and small discreteness,while the formula proposed by《Design Code for Steel-Concrete Sandwich Structures》in Japan was conservative.A new shear strength empirical formula was proposed based on the existing experimental data,which showed better accuracy and applicability.Based on the new shear strength formula and a mechanical model considering the concrete gap,a shear strength corrected formula for angle shear connectors with concrete gaps was proposed.The proposed corrected formula was verified based on 3 groups of specimens in other papers and 6 groups of specimens in the current test and was found to have good accuracy and small discreteness.

关 键 词：钢壳沉管隧道 角钢连接件 混凝土脱空 推出试验 受剪性能 

分 类 号：TU398.9[建筑科学—结构工程]