防灾减灾工程学报2023，Vol.43Issue(6)：1331-1345,15.DOI:10.13409/j.cnki.jdpme.20220504004
复式钢管混凝土柱装配式连接锚固性能试验研究
Experimental Study on Anchorage Performance of Fabricated Connec-tion of Composite-sectioned Concrete-filled Steel Tubular Column
摘要
Abstract
The traditional prefabricated RC structures were anchored by cement injection,but incom-plete grouting posed significant safety risks.In order to solve the connection problem of the assembled composite-sectioned concrete-filled steel tubular(CS-CFST)structure and explore a more convenient and reliable connection mode,this paper applied the connection mode of grouting first and then insert-ing reinforcement to connect the assembled CS-CFST columns,and systematically studied the an-chorage performance of the reinforcement in the assembled CS-CFST columns under this connection mode.By designing 36 groups of grouting before inserted rebar anchorage specimens of CS-CFST col-umns and using pull-out test method,the influence of seven factors on the anchorage performance of the grout anchored steel bars in the CS-CFST columns were systematically studied,including rebar di-ameter,position and rebar anchorage length,prefabricated hole form and diameter,grouting material strength and concrete strength.The results show that:(1)Three typical failure modes are identified,including the inserted rebar being pull out without yielding,the inserted rebar being pull out after yield-ing,and the tensile rupture of the inserted rebar.(2)The stress process of mortar anchor reinforce-ment in grouting material is mainly divided into four stages:elastic stage,yield stage,strengthening stage and failure stage.(3)The anchorage performance improves with larger prefabricated hole diame-ters and stronger grouting material and concrete.(4)The ultimate bearing capacity and ultimate bond stress of the anchored rebar in the corner are larger than those in the middle of the steel side;(5)The anchorage length of the fabricated connection of concrete filled steel tubular composite column is rec-ommended to be determined according to GB50010-2010,and the dimeter of the prefabricated holes is more than 2 times of the inserted rebar diameter,and no less than 32mm.关键词
复式钢管混凝土柱/锚固性能/拉拔试验/灌浆插筋/黏结应力Key words
composite-sectioned concrete-filled steel tubular column/anchorage performance/put-out test/grouting before inserted rebar/bond stress分类
建筑与水利引用本文复制引用
范光明,王卫华,徐哲人,蔡敏伟..复式钢管混凝土柱装配式连接锚固性能试验研究[J].防灾减灾工程学报,2023,43(6):1331-1345,15.基金项目
国家自然科学基金项目(51208217)、福建省自然科学基金项目(2014J01195)、泉州市科技计划项目(2017T002)资助 （51208217）
