多腔矩形纤维增强复合材料约束混凝土组合短柱受压性能  

Compressive behavior of concrete-filled multi-cavity composite rectangular columns

作　　者：杨来运 方海[1] 谢红磊 李奔奔 YANG Laiyun;FANG Hai;XIE Honglei;LI Benben(College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学土木工程学院,南京211816

出　　处：《复合材料学报》2023年第12期6910-6921,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52078248,52208252)。

摘　　要：为改善矩形拉挤型材受力性能,提高混凝土约束效率,提出一种多腔矩形纤维增强复合材料约束混凝土组合短柱。对多腔矩形纤维增强复合材料管及其约束混凝土构件进行了轴压试验,研究了多腔结构及增设格构腹板对拉挤型材约束混凝土结构破坏模式、峰值承载力及其延性特征的影响。试验结果表明,多腔结构有效改善拉挤型材脆性破坏特征,构件破坏前有明显征兆;多腔结构有效改善拉挤型材受力性能及其混凝土约束效率,其中拉挤型材承载力平均提高53.08%,约束混凝土强度平均提高约27.45%。增设格构腹板有效改善材料界面粘结性能,延缓约束面层局部屈曲,提高结构整体变形能力,其中格构增强多腔混凝土组合构件延性系数平均为2.23,远高于无格构构件的1.88;增设格构腹板进一步提高多腔结构混凝土约束效率,结构具有更高的峰值承载力,其中多腔约束混凝土构件承载力最大提高21.17%,远高于无格构构件的7.44%。此外,提出一种简易计算模型,分别对多腔矩形纤维增强复合材料管及其约束混凝土构件的峰值承载力进行了理论计算,计算结果与试验较一致。Concrete-filled multi-cavity pultruded composite rectangular column are proposed to improve the mechanical performance of rectangular pultruded profiles and their confinement effectiveness on the concrete core.The axial compression tests were carried out on the concrete-filled multi-cavity composite rectangular columns and related multi-cavity pultruded tubes.The effects of applications of the multi-cavity structure and lattice-webs on the failure modes,bearing capacity and ductility of specimens were investigated.The results reveal that the multi-cavity structure effectively improves the brittle manner of pultruded tubes,and thus improves the mechanical performance and the confinement efficiency of pultruded profiles,with an average 53.08%increase in the peak load and an average 27.45%increase in the axial stress of confining concrete.Moreover,applications of lattice-webs have positive effects on improving the interface bonding performance and thus better deformation capacity of the structure is observed.The average ductility coefficient of concrete-filled specimens reinforced with lattice-webs is 2.23,higher than that of specimens without lattice-webs(1.88).Applications of lattice-webs further improve the confinement effectiveness of the multi-cavity structure on the concrete,thus increasing the peak load of specimens.The maximum increase in the peak load of the concrete-filled multi-cavity structure is 21.17%,which is much higher than 7.44%of specimens without lattice-webs.A simple design-oriented model was proposed to predict the peak load of concretefilled multi-cavity specimens and related multi-cavity pultruded tubes.The results are consistent with the test data.

关 键 词：纤维增强复合材料约束混凝土柱 多腔结构 格构腹板 轴压性能 峰值荷载 

分 类 号：TB332[一般工业技术—材料科学与工程]