高温下钢筋灌浆套筒连接件的连接性能研究
摘要
基于设定的升温曲线并结合顺序耦合法,采用有限元分析软件ABAQUS对高温下钢筋套筒灌浆连接件的连接性能进行数值模拟研究,提出受火温度对构件应力场分布和轴向抗拉荷载的影响规律。研究表明:在轴向拉伸荷载作用下,钢筋套筒灌浆连接构件中的钢筋应力值沿轴向方向由承载端向非承载端逐渐降低,最不利位置出现在钢筋承载端的第一个钢筋肋处;套筒的应力值沿轴向方向由套筒端部向中部逐渐增大,最不利位置出现在套筒与灌浆料接触的第一个套筒肋处;灌浆料的应力分布较为均匀。随着受火温度的升高,套筒内部的灌浆料将从三向受压状态逐渐转化为两向受压状态,钢筋套筒灌浆连接构件的轴向抗拉荷载随之降低。
引文
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[2]Nomura.K,Hara.N,Mutsuyoshi.H,Machida.A.Experimental study on joints of main bars in prestressed concrete formworks[C]//Proceedings,Japan Concrete Institute,1993,15(2):259-264.
[3]Ling Jen Hua,IzniSyahrizal Ibrahim,George Morcous.Feasibility study of grouted splice connector under tensile load[J].Construction and Building Materials Engineer Structures,2015,83:154-162.
[4]Ali A.Sayadi,Ahmad Baharuddin Abd.Rahman.The relationship between interlocking mechanism and bond strength in elastic and inelastic segment of splice sleeve[J].Construction and Building Materials,2014,55:227-237.
[5]Ahmad Baharuddin Abd.Rahman.Performance of grouted splice sleeves with tapered bars under axial tension[J].Applied Mechanics and Materials,2015,1176-1180.
[6]Lie T T,Barbaros Celikkol.Method to calculate the fire resistance of circular reinforced concrete columns[J].ACI Material Journal,1991,88(12):84-91.
[7]李引擎,马道贞,徐坚.建筑结构防火设计计算和构造处理[M].北京:中国建筑工业出版社,1991.
[8]李卫,过镇海.高温下混凝土的强度和变形性能的试验研究[J].建筑结构学报,1993,14(1):8-16.
[9]周文君,刘永军,王雪.套筒灌浆钢筋高温抗拉性能数值模拟[J].水利与建筑工程学报,2016,14(5):170-176.
[10]胡海涛,董毓利.高温时高强混凝土强度和变形的试验研究[J].土木工程学报,2002,35(6):44-47.