火灾高温下新型单边螺栓连接剪切性能研究OA
Research on shear behavior of a new type of one-side bolted connection under high temperature in a fire
为了探究新型螺纹锚固单边螺栓能否适用于火灾高温环境下的抗剪连接,建立了剪切连接件有限元模型.通过常温下的连接件剪切试验对建立的有限元模型进行验证,采用恒温加载的方式开展有限元分析,设计了3种不同厚度的连接板,考虑了8种不同温度变化,通过改变材性对高温下钢材的屈服强度和刚度进行折减,系统研究了连接板的厚度及温度对连接件的剪切破坏模式、抗剪承载力和刚度等性能的影响;最后对中国现有规范中抗剪设计方法对该新型单边螺栓连接在火灾高温下的适用性进行了验证.结果表明:不同板厚的连接件可能出现孔壁承压破坏和螺栓剪切破坏2种破坏模式,火灾高温不会影响连接件的剪切破坏模式,但会降低其抗剪承载力和刚度,且降低程度与高温对钢材材性的折减程度基本一致;连接件的抗剪承载力和刚度随连接板厚度的增大而增大,但当其发生螺栓剪切破坏时,继续增大板厚对抗剪性能提高的效果有限;根据规范计算得到的连接件抗剪承载力为有限元结果的60%～80%,表明现有规范中的设计方法可用于计算其抗剪承载力,并具有足够的安全储备.该新型螺纹锚固单边螺栓可用于火灾高温下的抗剪连接,研究结果可为该类单边螺栓连接在火灾高温下的抗剪工程应用提供参考.
In order to explore whether the new type of one-side bolted connection through thread holes could be applied to shear connection in high-temperature environment in the fire,a finite element model of the shear connection was established.The established finite element model was verified by the results of the shear test that was carried out at ambient temperature.Steady state analysis was adopted in the finite element analysis.During the analysis,three different thicknesses of plates were designed,and eight different temperatures were considered,and the strength and stiffness of steal at high temperature were reduced by changing the material properties.Effects of the plate thickness and the temperature on shear failure mode,shear strength and stiffness of the connection were systematically investigated.Finally,the applicability of the shear design method in Chinese code for this new type of one-side bolted connection under high temperature in a fire was verified.Research results show that due to the difference in plate thickness,two failure modes might occur in the connection:bolt hole bearing failure and bolt shear failure.The high temperature will not affect failure mode of the connection,but it can reduce its shear strength and stiffness,and the degree of reduction is consistent with the degree of reduction in steel properties caused by the high temperature.The shear strength and stiffness of the connection increase with the increase of plate thickness.However,when bolt shear failure occurs,further increasing the plate thickness has a limited effect on improving the shear performance.The shear bearing capacity of the connection calculated by the code is 60%to 80%of the finite element analysis results.The design method in Chinese code can be used to calculate shear strength of the connection with sufficient security margin.This new type of one-side bolted connection through thread holes can be used for shear connections under high temperature in the fire.The research results can provide reference for the shear engineering application of this type of one-side bolt under high temperature in the fire.
朱绪林;尤洋;林明强;高莉;张岩
济南大学土木建筑学院,山东 济南 250022山东交通学院交通土建工程学院,山东 济南 250357济南大学土木建筑学院,山东 济南 250022济南大学土木建筑学院,山东 济南 250022济南大学土木建筑学院,山东 济南 250022
建筑与水利
金属结构单边螺栓剪切性能有限元分析螺纹锚固抗火
metal structureone-side boltshear behaviorfinite element analysisthread anchoragefire resistance
《河北工业科技》 2026 (2)
118-125,8
山东省自然科学基金(ZR2024ME215)
评论