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ID:27346456
大小:2.01 MB
页数:9页
时间:2018-12-02
《带约束拉杆方形薄壁钢管竹胶合板组合空芯柱轴心抗压性能.doc》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、[键入文字][键入文字][键入文字]带约束拉杆方形薄壁钢管/竹胶合板组合空芯柱轴心抗压性能赵卫锋1,屈鹏1,周靖2,龙志林*1(1.湘潭大学土木工程与力学学院,湘潭411105;2.华南理工大学亚热带建筑科学国家重点实验室,广州510640)摘要:为解决方形薄壁钢管/竹胶合板组合空芯柱(SBCC)抗压易开胶失效的问题,提出一种新型的带横向约束拉杆的方形薄壁钢管/竹胶合板组合空芯柱(SBCCB)。对9根SBCCB进行了轴心抗压试验,考察了SBCCB受压破坏形态,分析了SBCCB试件的截面尺寸、长细比和截面组合方式对其开胶荷载和极限承载荷载的影响,
2、并与已有SBCC的极限压应力进行了比较。试验结果表明:SBCCB的轴心抗压失效破坏主要为柱端及柱身横向约束拉杆之间的竹胶合板开胶破坏和竹胶合板材料破坏,其极限荷载不仅与截面尺寸和长细比相关,而且受截面组合方式影响。设置横向约束拉杆可有效减缓试件的开胶破坏,改变极限破坏模式,显著提高极限承载力;与SBCC的极限压应力相比,SBCCB极限压应力平均提高26%。通过非线性回归分析,建立SBCCB轴心抗压承载力计算公式。关键词:竹胶合板;薄壁方钢管;约束拉杆;组合空芯柱;轴心抗压;极限承载力中图分类号:TB332;TU366.1文献标志码:AAxial
3、compressionbehaviorofsquarethin-walledsteeltube/bambooplywoodcompositehollowcolumnwithbindingbarsZhaoWeifeng1,QuPeng1,ZhouJing2,LongZhilin*1(1.CollegeofCivilEngineeringandMechanics,XiangtanUniversity,Xiangtan411105,China;2.StateKeyLaboratoryofSubtropicalBuildingScience,South
4、ChinaUniversityofTechnology,Guangzhou510641,China)Abstract:Anewtypeofsquare,thin-walledsteeltube/bambooplywoodcompositehollowcolumnwithbindingbars(SBCCB)wasproposedtosolvetheissuethatthegeneralthin-walledsteeltube/bambooplywoodcompositehollowcolumn(SBCC)wasliabletothegluefai
5、lureundercompressiveload.9SBCCBswereusedtoperformtheaxialcompressiontests.ThefailuremodesofSBCCBloadedwereinvestigated,andtheinfluencesofthenetcross-sectionalarea,slendernessratioandsectionalcombinationmodeofSBCCBonthecrackloadandultimatebearingloadofSBCCBwereanalyzed.Theult
6、imatecompressivestressofSBCCBwascomparedtothatoftheexistingSBCC.TheresultsindicatethatthecompressivedamageofSBCCBsareprimarilythebrokendamagetobambooplywoodmaterialandthegluefailurebetweenthematrixinterfacesattheendofcolumnandthemiddleofcolumnbetweenbindingbars.Theultimatebe
7、aringcapacityisnotonlyrelatedtothenetcross-sectionalareaandslendernessratio,butalsorelatedtothesectionalcombinationmodeofSBCCB.Thebindingbarscaneffectivelysuppressthegluefailure,changetheultimatefailuremodeandsignificantlyimprovetheultimatecarryingcapacityofSBCCB.Comparedwit
8、htheSBCCs,theultimatecompressivestressofSBCCBscanbeaveragelyincreasedby26%.
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