摘要
在各向异性弹性力学的基础上,根据Tsai-Wu强度准则建立加固木柱屈服荷载和屈服应变的计算公式,进行15根FRP加固木柱的轴心抗压性能试验,详细探讨受载后试件的工作机理和破坏模式。试验结果表明,FRP横向加固木柱可提高木柱的抗压承载力,改善木柱的延性;三层GFRP可提高木柱承载力和峰值应变分别达21.82%和94.95%;加固木柱达到极限荷载时,横向加固层没有出现拉断现象,其横向应变并未达到横向加固层的极限应变,仅为FRP极限拉应变的10%左右。通过分析峰值应变比和约束刚度比的关系,提出加固木柱极限承载力和峰值应变的计算公式。经比较,计算值和试验结果吻合较好。
Based on anisotropic elastic mechanics and Tsai-Wu criterion, formulas to predict the yield load and yield strain of strengthened timber columns were established. The compressive behavior of 15 cylindrical timber columns that are externally wrapped by FRP sheets were tested. The work mechanism and failure modes of the specimens were discussed in details. The results show that FRP can effectively improve the compressive bearing capacity and ductility of the timber columns by strengthening it laterally. Capability and peak strain of timber columns wrapped laterally by three sheets of FRP are higher than those of unstrengthened columns by about 21.82% and 94.95%, respectively. The lateral strengthening sheets are not fractured, and its hoop strain is only about 10% of the ultimate strain. According to the relationship between the peak strain ratio and the confined stiffness ratio, expressions of the ultimate load and the peak strain have been proposed. By comparison, the predictions of the formulas agree well with test data.
出处
《土木工程学报》
EI
CSCD
北大核心
2012年第8期48-54,共7页
China Civil Engineering Journal
基金
国家科技支撑计划(2020BAK69B28)
关键词
FRP
加固
木柱
极限荷载
峰值应变
FRP
strengthen
timber column
ultimate load
peak strain
