钢管约束竹-混凝土组合柱轴压力学性能  

Compressive performance of bamboo scrimber and concrete-filled steel tube columns

作　　者：韦宝幸 魏洋[1] 王高飞 邢泽 林煜 WEI Baoxing;WEI Yang;WANG Gaofei;XING Ze;LIN Yu(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学土木工程学院,南京210037

出　　处：《复合材料学报》2024年第6期3115-3128,共14页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52378244,52308257);江苏省自然科学基金(BK20231028,BK20230399);江苏省重点研发计划(BE2020703)。

摘　　要：将轻质高强的重组竹埋入钢管混凝土柱(CFST)的核心形成钢管约束竹-混凝土组合柱(BCFST),期望利用钢管的约束作用充分发挥重组竹的抗压强度并延缓其劈裂破坏。为研究BCFSTs的轴压性能,在3组BCFSTs轴压试验的基础上,采用ABAQUS有限元软件建立了相应的模型进行了非线性有限元分析。通过比对试件的破坏形式、荷载-位移曲线等结果,验证了有限元模型的可靠性与适用性;基于验证后的有限元模型,对重组竹尺寸和钢管径厚比两个关键设计变量进行参数化分析。结果表明:在相同钢管壁厚的钢管混凝土柱中,增大重组竹截面尺寸可以抑制荷载-位移曲线峰值点后的下降过程,BCFSTs的峰值承载力相较于CFST的提升范围均在8%以上,最大提升16%;试件的极限荷载呈现明显增长趋势,BCFSTs的极限承载力相较于CFST的最大提升可达到33.2%。钢管壁厚的增加使重组竹和混凝土受到的环向约束增强,核心截面强度得以提高,钢管壁厚由4.5 mm变化为6.0 mm时,试件极限荷载最大提升18.2%。The light and high strength bamboo scrimber was buried in the core of concrete-filled steel tube column(CFST)to form bamboo scrimber and concrete-filled steel tube column(BCFST),which was expected to give full play to the compressive strength of the bamboo scrimber and delay its crushing and splitting.In order to study the axial compression performance of BCFSTs,on the basis of three groups of axial compression tests,the corresponding model was established by using ABAQUS finite element software and the nonlinear finite element analysis wascarried out.The reliability and applicability of the finite element model were verified by comparing the failure forms and load-displacement curves of the specimens.Based on the verified finite element model,the two key design variables of bamboo scrimber dimension and diameter to thickness ratio of steel tube were parameterized.The analysis results show that:For CFSTs with the same wall thickness,increasing the dimension of bamboo scrimber can inhibit the decline of load-displacement curve after peak point.Compared with CFSTs,the peak load of BCFSTs is increased by more than 8%,and the maximum increase is 16%.The ultimate load of the specimens show a clear growth trend,and the ultimate bearing capacity of the specimens with built-in bamboo scrimber could reach 33.2%compared with that of the CFSTs.With the increase of wall thickness of steel tube,the circumferential constraint of bamboo scrimber and concrete is strengthened,and the core section strength is improved.When the wall thickness of steel tube changes from 4.5 mm to 6.0 mm,the ultimate load of the specimen is increased by 18.2%.

关 键 词：钢管混凝土柱 组合柱 重组竹 约束 竹-混凝土 有限元模型 轴压承载力 

分 类 号：TU398.6[建筑科学—结构工程] TB332[一般工业技术—材料科学与工程]