H型钢-花旗松胶合木组合螺栓连接件抗剪性能试验研究

Experimental study on shear performance of bolted steel-timber composite connection between H-section Steel and Douglas-Fir Glulam

摘要

螺栓连接构造简单、安装便捷、性能可靠,是钢-木组合(steel-timber composite, STC)结构中最常用的连接件之一。文章对H型钢-花旗松胶合木组合螺栓连接件进行推出试验,研究螺栓直径和胶合木板厚对破坏模式、荷载-滑移曲线、抗剪刚度和抗剪承载力的影响,并采用欧洲屈服模型进行了承载力预测。结果表明:STC螺栓连接件的破坏模式为螺栓单铰和双铰屈服、螺栓剪断和木材劈裂破坏;随着长细比增加,极限滑移增大,螺栓的屈服模式从单铰向双铰过渡;螺栓直径增加20%,峰值荷载和屈服荷载分别增加了40.69%和74.06%。胶合木板厚度增加42.86%,峰值荷载和屈服荷载分别增加了25.90%和15.45%;螺栓连接件的峰值荷载显著大于同螺栓直径和板厚的螺钉与螺钉-灌浆块螺栓连接件;EC5推荐的计算公式能够准确的预测STC螺栓连接件的抗剪承载力,并且保留一定的安全裕度,计算结果与试验结果的相对误差范围为-21.33%~-4.84%。

Abstract

Boltes are among the most commonly used connectors in steel-timber composite (STC) structures because of their simple configuration, convenient installation, and reliable performance. In this study, push-out tests were conducted on H-section steel-Douglas-fir glulam composite bolted connections to investigate the effects of bolt diameter and glulam panel thickness on failure modes, load-slip curves, shear stiffness, and shear capacity. The European yield model was also used to predict the bearing capacity. The results show that the failure modes of STC bolted connections include single and double-hinges yielding of bolts, bolt shear failure, and timber splitting. As the slenderness ratio increased, the ultimate slip increased, and the bolt yielding mode shifted from single-hinge to double-hinge yielding. When the bolt diameter increased by 20%, the peak load and yield load increased by 40.69% and 74.06%, respectively. When the glulam panel thickness increased by 42.86%, the peak load and yield load increased by 25.90% and 15.45%, respectively. The peak load of bolted connections was significantly higher than that of screw and screw-grout block bolted connections with the same connector diameter and panel thickness. The EC5 formula accurately predicted the shear capacity of STC bolted connections while retaining a safety margin, with relative errors ranging from -21.33% to -4.84% between the test results and calculation results.

关键词

钢-木组合结构 / 螺栓连接件 / 推出试验 / 抗剪性能

Key words

steel-timber composite structure / bolted composite / push-out test / shear performance

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基金资助

济南市“新高校20条”自助培育创新团队项目(202228057)