方钢管玄武岩纤维再生混凝土短柱偏压性能研究  

STUDY ON THE ECCENTRIC COMPRESSIVE PERFORMANCE OF BASALT-FIBER REINFORCED RECYCLED AGGREGATE CONCRETEFILLED SQUARE STEEL TUBULAR STUB COLUMNS

作　　者：张向冈 杨俊娜[2] 丁亚红 薛建阳[4] 王兴国[2] ZHANG Xiang-gang;YANG Jun-na;DING Ya-hong;XUE Jian-yang;WANG Xing-guo(State Key Laboratory of Building Safety and Built Environment,Beijing 100013,China;School of Civil Engineering,Henan Polytechnic University,Jiaozuo,He’nan 454003,China;National Engineering Research Center of Building Technology,Beijing 100013,China;School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an,Shaanxi 710055,China)

机构地区：[1]建筑安全与环境国家重点实验室,北京100013 [2]河南理工大学土木工程学院,河南焦作454003 [3]国家建筑工程技术研究中心,北京100013 [4]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《工程力学》2022年第1期45-58,共14页Engineering Mechanics

基　　金：建筑安全与环境国家重点实验室暨国家建筑工程技术研究中心开放课题项目(BSBE2019-06);国家自然科学基金项目(U1904188);河南省重点研发与推广专项项目(212102310288);河南省高校基本科研业务费专项项目(NSFRF200320,NSFRF200328)。

摘　　要：为研究方钢管玄武岩纤维再生混凝土短柱的偏压性能,以再生粗骨料取代率、玄武岩纤维掺量、再生混凝土强度等级、偏心距为变化参数,设计并制作8个短柱试件,进行偏压静力加载试验。观察了试件破坏过程及形态,获取了荷载-位移、荷载-应变等重要关系曲线。分析了设计参数对试件承载力的影响趋势,建立了试件偏心受压的有限元分析模型,并建议了试件偏心受压承载力的设计计算方法。结果表明:方钢管玄武岩纤维再生混凝土短柱受力过程均经历了弹性、弹塑性和塑性-下降阶段,所有试件荷载-柱中侧向挠度曲线形状较为相似,在达到峰值荷载之后,柱中侧向挠度增加较快;试件的峰值承载力随着取代率或偏心距的增加而减小,随着核心再生混凝土强度等级的增大而增大;该文所建立的方钢管玄武岩纤维再生混凝土短柱有限元模型能够有效地对其偏压力学性能进行全过程分析。To study the eccentric compressive performance of basalt-fiber reinforced recycled aggregate concrete-filled square steel tubular stub columns,eight specimens with different replacement ratios of recycled coarse aggregates,basalt fiber dosages,recycled aggregate concrete strength grades,and eccentricities were tested under eccentric static loading.The failure process and modes were observed.The load-displacement curves,loadstrain curves and a series of important relation curves were obtained.The influence trend of the design parameters on the strengths of the specimens was analyzed.A finite element model under eccentric compression was established.The design method for calculating the eccentric compression strength of the specimens was suggested.It is shown that the failure process is made up of an elastic stage,an elastic-plasticity stage and a plastic-decline stage.The shapes of the load-deflection curves of all specimens were similar.The lateral deflection of the columns increased rapidly after reaching the peak load.The peak strengths of the specimens decreased with the increase of the replacement ratio and eccentricity,and increased with the increase of the core recycled aggregate concrete strength grade.The finite element model of a basalt-fiber reinforced recycled aggregate concrete-filled square steel tubular stub column was established,which can effectively analyze the whole process of its eccentric compression.

关 键 词：方钢管再生混凝土 玄武岩纤维 短柱 偏心受压 承载力 有限元分析 

分 类 号：TU398.9[建筑科学—结构工程]