低温下栓钉连接件抗剪承载力的数值模拟研究

FINITE ELEMENT ANALYSIS OF SHEAR CAPACITY OF STUD CONNECTIONS AT LOW TEMPERATURE

为研究低温下栓钉连接件的抗剪承载力,通过有限元软件ABAQUS建立低温推出试验模型,并进行低温推出试验验证有限元模型的准确性。通过56个模型参数化分析,得出研究结论:栓钉连接件的抗剪承载力随温度降低而提高,在-20,-40,-60℃时相较于常温下分别提高12.1%、18.6%和24.2%;低温环境下,混凝土强度是栓钉连接件抗剪承载力的主要影响因素,而栓钉自身强度对连接件整体抗剪承载力的影响较小。在严寒地区组合结构的设计中,建议在已有的承载力设计公式基础上,引入混凝土低温影响系数。

In order to study the shear capacity of stud connectors at low temperature,a finite element model was established by software ABAQUS,and the accuracy of the model was verified by push-out test at different low temperatures.Through the parametric analysis of 56 models,the results showed that the shear capacity of the stud connectors increased by 12.1%,18.6%and 24.2%at-20℃,-40℃and-60℃,respectively.Concrete strength was the main factor of shear capacity of stud connectors at low temperature,however,studs had little effect on the structure.Based on the existing shear capacity design formula,the low temperature influence coefficient of concrete could be introduced,which could better provide reference for the design of composite structures in severe cold regions.