摘要
玻璃钢纤维增强复合材料管-石粉地聚物混凝土-钢管组合柱(DSTC-GC)是一种将废弃大理石粉地聚物混凝土代替普通混凝土而得到的一种新型组合柱。以玻璃钢纤维增强复合材料(GFRP)及钢管的外直径与管厚、混凝土类型、截面空心率等为参数共设计制作了11根试件并开展了轴压性能研究。结果表明:DSTC-GC试件出现三种典型破坏形态,试件曲线呈典型的双线性强化,较普通混凝土DSTC试件发现荷载-钢管应变曲线出现平缓屈服台阶。GFRP及钢管对试件力学性能及变形影响显著,合理的空心率有利于提高DSTC-GC试件材料的使用效率及延性。废弃石粉在DSTC-GC试件中的掺量为50%(质量分数)时试件的轴压性能较好,而普通混凝土DSTC试件轴压性能优于DSTC-GC。基于试验结果,建立了f_(cc)/f_(c0)、ε_(cc)/ε_(c0)及λ_(t)之间的函数关系,对比发现Gao等模型更适用DSTC-GC试件承载力计算。
Glass fiber reinforced polymer tube-stone dust geopolymer concrete-steel tubular columns(DSTC-GC)is a new type of composite column obtained by replacing ordinary concrete with waste marble dust geopolymer concrete.A total of 11 specimens were designed and manufactured to study the axial compression performance of glass fiber reinforced polymer(GFRP)and steel tube thickness,concrete type,section hollow ratio and other parameters.The results show that the DSTC-GC specimen has three typical failure modes,and the curve of the specimen shows typical bilinear strengthening.Compared with the ordinary concrete DSTC specimen,it is found that the load-steel tube strain curve has a gentle yield step.GFRP and steel tube have obvious influence on the mechanical properties and deformation of the specimens.Reasonable hollow ratio is beneficial to improve the efficiency and ductility of DSTC-GC specimens.When the content of waste stone powder is 50%(mass fraction),the axial compression performance of DSTC-GC specimen is better,while the axial compression performance of ordinary concrete DSTC specimen is better than that of DSTC-GC.Based on the test results,the functional relationship between f_(cc)/f_(c0),ε_(cc)/ε_(c0) andλt is established.It is found that Gao et al.s model is more suitable for the bearing capacity calculation of DSTC-GC specimens.
作者
王痛快
赵琪
雷婷
杨文伟
WANG Tongkuai;ZHAO Qi;LEI Ting;YANG Wenwei(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Ningxia Center for Research on Earthquake Protection and Disaster Mitigation in Civil Engineering,Yinchuan 750021,China;School of Architecture and Electrical Engineering,Hezhou University,Hezhou 542899,Guangxi,China;Xinhua College of Ningxia University,Yinchuan 750021,China)
出处
《材料导报》
CSCD
北大核心
2023年第23期250-258,共9页
Materials Reports
基金
国家自然科学基金(52168025)
宁夏自然科学基金(2021AAC03116)
广西贺州市科技开发计划(贺科攻1908006)
广西重点研发计划(桂科AB22036002)。
