摘要
在活性粉末混凝土(Reactive powder concrete,RPC)预制管内浇注混凝土,并在RPC预制管和内部混凝土中均配置纵向钢筋,形成一种新型组合柱——RPC预制管混凝土组合柱。采用平截面假定,并结合已有的RPC、混凝土和钢筋材料本构模型,推导了该新型柱大偏压受力状态的承载力计算式。分别采用该承载力计算式和Opensees纤维模型对两种截面的新型柱承载力进行了对比分析,两种方法的计算结果较为接近。基于柱梁承载力比、RPC预制管中钢筋等级等参数,采用Opensees纤维模型分析了配有该新型柱的RC框架的抗震性能。结果表明:当RPC预制管中配置的钢筋等级提高至HRB400及以上时,结构耗能能力和延性系数均有较大程度的提高;当柱梁承载力比不超过1.2时,随柱梁承载力比的增加,结构抗震性能改善效果不明显,而当柱梁承载力比为1.5及以上时,结构抗震性能随柱梁承载力比的增加会有明显的提升。
An innovative column,named concrete-filled precast RPC tubular column,was presented in this paper.In this composite column,concrete was casted into precast RPC tube and steel bar were arranged in both concrete filled inside and precast RPC tube.Using the assumption of plane section,the formulas on bearing capacity was obtained for this column with large eccentricity compression based on the prescribed constitutive laws of RPC,concrete and steel.Bearing capacity analysis was performed for the columns with 2 different sections by the obtained formulas and the Opensees fiber model,respectively.The capacity results obtained by these two methods were closed to each other.Considering variations of parameters:the ratio of column bearing capacity to beam bearing capacity and steel grade arranged in precast RPC tube,seismic performance of RC frames with the columns was also analyzed by the Opensees fiber model.It showed that:the energy dissipation and ductility can be improved dramatically with the steel grade equal to or higher than HRB400 arranged in precast RPC tube;with the increase of the ratio of column bea-ring capacity to beam bearing capacity,the seismic performance can be improved minorly when the ratio not larger than 1.2,but can be improved dramatically when the ratio equal to or larger than 1.5.
作者
蒋友宝
吴林华
陈治茂
JIANG Youbao;WU Linhua;CHEN Zhimao(School of Civil Engineering,Changsha University of Science and Technology,Changsha 410114)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2017年第23期90-95,共6页
Materials Reports
基金
国家自然科学基金(51678072)
"湖湘青年英才"支持计划(2016RS3030)
