强地震作用后养护期混凝土力学性能模拟
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摘要
通过模拟试验研究强地震作用后养护期混凝土力学性能的变化情况,以及早强剂对养护期混凝土抗震性能的影响.结果表明:养护初期,混凝土的应力与应变呈线性变化关系,随着荷载增加而逐渐变为非线性关系;地震作用对受振时龄期短于一定时间的混凝土的抗压强度影响显著;早强剂含量越高,则混凝土的硬化速度越快.
Curing concrete's mechanical properties under the strong earthquake action and the influence of early strength agent on the seismic resistance of curing concrete were researched through simulating test.The results show that: ① the stress-strain relationship is linear at initial stage,then becomes nonlinear with the increasing load;② the compressive strength of seismic vibrated concrete sample is significantly lower than that of common sample,so seismic vibration has a significant effect to concrete sample when curing time is less than certain time;③ the early strength agent content has a clear effect on concrete in gelled state,the higher the content of early strength agent is,the faster the concrete hardens.
Curing concrete's mechanical properties under the strong earthquake action and the influence of early strength agent on the seismic resistance of curing concrete were researched through simulating test.The results show that: ① the stress-strain relationship is linear at initial stage,then becomes nonlinear with the increasing load;② the compressive strength of seismic vibrated concrete sample is significantly lower than that of common sample,so seismic vibration has a significant effect to concrete sample when curing time is less than certain time;③ the early strength agent content has a clear effect on concrete in gelled state,the higher the content of early strength agent is,the faster the concrete hardens.
引文
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[2]Issa M A,Yousif A A,Issa M A.Effect of construc-tion loads and vibrations on new concrete bridge decks[J].Journal of Bridge Engineering,2000,5(3):249-258.
[3]Su D,Fujino Y,Nagayama T,et al.Vibration of rein-forced concrete viaducts under high-speed train pas-sage:Measurement and prediction including train-via-duct interaction[J].Structure and Infrastructure Engi-neering,2010,6(5):621-633.
[4]Kwan A K H,Zheng W,Ng I Y T.Effects of shockvibration on concrete[M].USA:ACI Mater J,2005:405-413.
[5]张瀑,鲁兆红.地震时未达龄期混凝土的处置[J].施工技术,2008(12):75-77.ZHANG Pu,LU Zhao-hong,Treatment of early ageconcrete in earthquake[J].Construction Technology,2008(12):75-77.
[6]金南国,金贤玉,钱在兹.早期混凝土静力与动力损伤特性的研究试验研究[J].浙江大学学报,1997(3):372-379.JIN Nan-guo,JIN Xian-yu,QIAN Zai-zi,Study ondamage characteristics of early concrete under staticand dynamic load[J].Journal of Zhejiang University,1997(3):372-379.
[7]黄政宇,赵俭英.混凝土配合比速查手册[M].北京:中国建筑工业出版社,1999:208.
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