超高性能混凝土增强钢筋混凝土组合柱偏压性能试验研究  

Experimental Research on Mechanical Properties of UHPC-RC Composite Columns Under Eccentric Compression

作　　者：刘磊[1,2] 何真 汪鹏[4] 蔡新华 孟凡冰 罗滔[4] LIU Lei;HE Zhen;WANG Peng;CAI Xinhua;MENG Fanbing;LUO Tao(State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,China;Shandong Chunhe New Materials Research Inst.Co.,Ltd.,Rizhao 276800,China;School of Intelligent Construction,Wuchang University of Technology,Wuhan 430040,China;College of Civil Engineering,Xijing University,Xi’an 710123,China)

机构地区：[1]武汉大学水资源工程与调度全国重点实验室,武汉430072 [2]山东春禾新材料研究院有限公司,山东日照276800 [3]武昌理工学院智能建造学院,武汉430040 [4]西京学院土木工程学院,西安710123

出　　处：《工业建筑》2024年第3期153-160,共8页Industrial Construction

基　　金：国家“973”重点基础研究发展计划资助项目(2015CB655101);山东省自然科学基金项目(ZR2021ME002)。

摘　　要：利用超高性能混凝土(UHPC)等量取代钢筋混凝土(RC)偏压柱受拉侧一定厚度混凝土,制作了8个UHPC-RC组合柱(包括2个RC对比柱),研究偏心距、UHPC层厚度和UHPC层配筋等对组合柱开裂性能、极限承载力和延性的影响规律,结果表明:与对比柱相比,UHPC显著提高了组合柱抗裂性能,不同程度延缓裂缝出现,且受拉区呈典型“多缝开裂”破坏形态;随着UHPC层厚度增加和UHPC层配筋增强,组合柱的极限承载力和延性均不同程度提高;建立了UHPC-RC组合偏压柱的极限承载力计算模型,理论计算值与试验值吻合较好。Eight UHPC-RC(ultra-high performance concrete-reinforced concrete)composite columns(including two RC contrast columns)were fabricated by using ultra-high performance concrete(UHPC)to replace certain thickness of ordinary concrete on the tensile zone of reinforced concrete(RC)columns.The influence of eccentricity,UHPC layer thickness and UHPC layers with or without steel bars on cracking performance,ultimate bearing capacity and ductility of composite columns was studied.The results showed that UHPC layers significantly improved the crack resistance of RC columns,delayed the occurrence of cracks to different degrees,and presented the typical multi-cracks on the tensile side of UHPC-RC composite columns.The ultimate bearing capacity and ductility of UHPC-RC composite columns were improved to various extends,with the increase of UHPC layer thickness and combination of UHPC layers and steel reinforcing bars(R-UHPC).The formula of calculating the ultimate bearing capacity of UHPC-RC composite columns was proposed,and it showed a good agreement between the calculated values and the experimental results.

关 键 词：超高性能混凝土 组合柱 偏心受压 抗裂性能 极限承载力 

分 类 号：TU375.3[建筑科学—结构工程]