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（1 臺(tái)州職業(yè)技術(shù)學(xué)院建筑工程學(xué)院, 臺(tái)州 318000; 2 鄭州大學(xué)土木工程學(xué)院, 鄭州 450001）

［摘要］將一種新型的抗剪栓釘——雙釘頭型栓釘，應(yīng)用于鋼-混凝土組合桁架梁。通過有限元分析采用雙釘頭型栓釘?shù)匿?/span>-混凝土組合桁架梁的抗彎承載力，比較了采用雙釘頭型栓釘和傳統(tǒng)栓釘?shù)匿?/span>-混凝土組合桁架梁的受力特性。由于雙釘頭型栓釘加強(qiáng)了栓釘?shù)撞康膭偠?，可提高栓釘抗剪承載力。采用雙釘頭型栓釘對(duì)鋼-混凝土組合桁架梁彈性剛度的影響可以忽略，但鋼-混凝土組合桁架梁塑性階段的剛度會(huì)有明顯提高，同時(shí)其抗彎承載能力也有一定提高。對(duì)比分析表明，采用雙釘頭型栓釘對(duì)非完全抗剪連接的鋼-混凝土組合桁架梁受力性能的提高比完全抗剪連接的大。在設(shè)計(jì)非完全抗剪連接的鋼-混凝土組合桁架梁時(shí)，建議采用雙釘頭型栓釘。鋼-混凝土組合桁架梁彈性階段的有效寬度系數(shù)近似不變，塑性階段有效寬度系數(shù)隨荷載增加逐漸增大。相同條件下，寬跨比和高跨比越大，塑性階段有效寬度系數(shù)越小。

［關(guān)鍵詞］鋼-混凝土組合桁架梁； 雙釘頭型栓釘； 抗彎性能； 有效寬度系數(shù)； 有限元分析

中圖分類號(hào)：TU317+.1, TU398文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2015)11-0065-05

Study on bending behavior of steel-concrete composite truss girder with

double-nut stud shear connectors

Wang Yang1, Zhang Meng2

(1 School of Civil Engineering, Taizhou Vocational & Technical College, Taizhou 318000,China;

2 School of Civil Engineering, Zhengzhou University, Zhengzhou 450001,China)

Abstract:A new type of stud shear connector—double-nut stud shear connector can be used in steel-concrete composite truss girder (SCCTG). Finite element analysis method was used to evaluate the bending behavior of SCCTG with double-nut stud shear connectors. Comparison between mechanical characteristics of SCCTG with double-nut stud shear connectors and SCCTG with traditional studs was conducted. Double-nut stud shear connectors strengthen the stiffness of the bottom stud and enhance the shearing capacity of studs. The elastic stiffness impact of SCCTG with double-nut stud shear connectors can be ignored, but the stiffness of SCCTG in plastic stage  is improved remarkably and bearing capacity can be improved. Comparative analysis shows that double-nut stud shear connector can get more mechanical characteristics improvement for partial shear connection steel-concrete composite truss girder than for full shear connection steel-concrete composite truss girder. Double-nut stud shear connector is recommended when designing the partial shear connection steel-concrete composite truss girder. In addition, effective width factor of

steel-concrete composite truss girder

 almost remains unchanged in elastic stage. Effective width increases as load increases in plastic stage. In the same condition, the greater the width-span ratio and depth-span ratio are, the smaller the effective width factor in plastic stage is.

Keywords:steel-concrete composite truss girder； double-nut stud shear connector; bending behavior； effective width factor； finite element analysis

*浙江省自然科學(xué)基金項(xiàng)目（Y1100387），浙江省高職高專院校專業(yè)帶頭人專業(yè)領(lǐng)軍項(xiàng)目（lj2013143）。

作者簡(jiǎn)介：汪洋，博士，副教授，Email: wangyang96@126.com。

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