焊钉连接件抗剪承载力试验研究

为建立组合桥梁使用的大尺度焊钉连接件抗剪承载力设计计算方法,通过26组71个焊钉连接件模型推出试验比较分析了混凝土抗压强度及焊钉的抗拉强度、直径、长度等对焊钉连接件抗剪承载力的影响;基于国内外255个模型推出试验结果提出了双折线型焊钉连接件抗剪承载力计算式.研究结果表明,焊钉连接件抗剪承载力在混凝土强度较高时仍取决于焊钉杆部与混凝土的组合作用;提出的设计计算式在常用的混凝土强度等级C35～C60范围内能够更合理地偏于安全的计算焊钉连接件抗剪承载力;可适用于使用混凝土强度等级C15～C80、焊钉长径比大于4且直径9～30mm、长度50～400mm的组合桥梁结构焊钉连接件的设计.

EXPERIMENTAL STUDY OF SHEAR CAPACITY OF STUD CONNECTOR

A great number of model tests were carried out to build up a method for calculating the shear capacity of large diameter stud connector used in high strength concrete for bridge structures. A comparative study was made of 26 groups consisting of 71 stud connector models to explore the influence of different parameters such as the concrete compressive strength, the stud diameter, the stud tensile strength and the stud length on the shear capacity of stud connectors. Formulas to calculate the shear capacity of stud connector were proposed based on the worldwide 255 test results. The results show that the shear capacity of stud connector in high strength concrete is still based on the composite behavior of the stud and the concrete. Besides, the proposed formulas are more reasonable and safe in predicting the shear capacity of stud connector in a commonly used concrete which ranges from C35 to C60. These formulas are suitable for the analysis of stud connector with the diameters of 9 mm to 30 mm and the lengths of 50 mm to 400 mm as well as the ratio of stud length and diameter over 4, used in concrete with cubic compressive strength from 15.0 MPa to 80.0 MPa.