论文部分内容阅读
通过试验研究,验证现行交错孔洞平板螺栓连接受拉极限承载力计算方法(等面积法及s2/(4g)法)的准确性。进行了16个足尺双列交错孔洞平板螺栓连接试验,试验参数包括交错孔洞纵向间距、横向间距及材料特性。试验结果表明,16个试件破坏于横向截面或交错截面,并且随孔洞纵向间距的增加,破坏形式没有如等面积法及s2/(4g)法所预测的具有从交错截面向横向截面转变趋势,等面积法及s2/(4g)法均无法准确判断连接的破坏形式。试验结果同时表明钢材延性对破坏形式及承载力有较大的影响,这主要是钢材的较低延性将引起螺栓孔洞附近钢板因应力集中而过早破坏。当交错孔洞纵向间距较大时,等面积法及s2/(4g)法预测的受拉极限承载力明显高估了由试验所得的实际承载能力。基于试验结果及理论分析,提出了一种修正s2/(4g)法,利用其得出的预测值与试验值符合较好。
Through the experimental study, the accuracy of the calculation method (equal area method and s2 / (4g) method) of the tensile ultimate bearing capacity of the cross-linked bolt holes is verified. Sixteen full-length double-row staggered hole plate bolts were tested. The test parameters included the longitudinal, transverse and material properties of the interlaced holes. The experimental results show that 16 specimens destructed transversely or cross-sectionally and the failure modes did not have the tendency to change from the cross-section to the transverse direction as predicted by the equal-area method and the s2 / (4g) method as the longitudinal spacing of the holes increased , Equal area method and s2 / (4g) method can not accurately judge the damage form of connection. The test results also show that the ductility of steel has a greater impact on the form of failure and bearing capacity, which is mainly due to the lower ductility of steel will cause premature failure of the steel plate near the bolt hole due to stress concentration. When the longitudinal spacing of staggered holes is larger, the ultimate load carrying capacity predicted by the equal area method and the s2 / (4g) method significantly overestimates the actual carrying capacity obtained from the test. Based on the experimental results and theoretical analysis, a modified s2 / (4g) method is proposed, and the predicted value obtained by the method is in good agreement with the experimental data.