木质工字梁腹板端头压板稳定性初探  

End Instability of the Web of Wooden I-Joist under Perpendicular Loading

作　　者：袁福兴[1] 姚顺忠[1] 张宏健[1] 

机构地区：[1]西南林学院

出　　处：《林产工业》2009年第3期20-22,共3页China Forest Products Industry

基　　金：云南省国际合作暨科技兴贸计划(2006GH11);国家自然科学基金项目(30771684)联合资助

摘　　要：对木质工字梁(IJ)腹板端头压板失稳行为的试验结果表明:木大片刨花板(WWB)、竹大片刨花板(BWB)和胶合板(W-Ply)腹板的失稳均为极值点失稳,且都经历了弹性、弹塑性和屈曲阶段的变形;大片刨花类腹板的失稳破坏特征是层间剪切破坏,胶合板腹板的失稳破坏特征是表板折断破坏;失稳临界荷载的强弱顺序为:W-ply>BWB>WWB;失稳破坏荷载的大小顺序为:(W-Ply≈BWB)>WWB;失稳后残余承载能力的强弱顺序为:BWB>W-Ply>The tests of end instability of the web of wooden I-Joist under perpendicular loading were carried out with 3 kinds of material, waferboard （ WWB）, bamboo waferboard （ BWB ） and wood-plywood （W-Ply） being used as webs. Experiment results showed： all the webs made of different kinds of material had limiting maximum instability loading, and their deformation went through elastic, elasto-plastic and buckling stages successively; the main form of end instability of webs made of WWB or BWB was shearing rupture among the wafers, while that of W- Ply web was tensile fracture of surface veneer; the order of limiting instability load- ing, the order of end instability rupture loading and that of remanent load bearing capacity were W- Ply 〉 BWB 〉 WWB, （W-Ply ≈ BWB） 〉 WWB, and BWB 〉 W-Ply 〉 WWB, respectively.

关 键 词：木质工字梁 腹板 压板稳定性 

分 类 号：TS66[轻工技术与工程]