西南交通大学学报
西南交通大學學報
서남교통대학학보
JOURNAL OF SOUTHWEST JIAOTONG UNIVERSITY
2014年
5期
779-786
,共8页
钢管混凝土%试验研究%有限元法%耐火性能
鋼管混凝土%試驗研究%有限元法%耐火性能
강관혼응토%시험연구%유한원법%내화성능
concrete-filled steel tube%experimental research%finite element method%fire resistance performance
为探讨轴心受压方形截面钢管混凝土叠合柱的耐火性能,对4根轴心受压方形截面钢管混凝土叠合柱进行了试验研究,并对火灾荷载比、截面含管率和截面边长等对耐火性能的影响进行了有限元分析。研究结果表明:当火灾荷载比减小、截面含管率和截面边长增大时,火灾作用下试件的轴向膨胀变形增大,轴向压缩变形减小;在相同的升温曲线和火灾时间作用下,截面边长增大时,柱内温度降低;含管率变化对柱内温度场影响较小。火灾荷载比、截面边长和长细比是影响轴心受压方形截面叠合柱耐火性能的主要因素;含管率、纵筋配筋率和材料强度变化对轴心受压方形截面叠合柱耐火性能的影响较小。
為探討軸心受壓方形截麵鋼管混凝土疊閤柱的耐火性能,對4根軸心受壓方形截麵鋼管混凝土疊閤柱進行瞭試驗研究,併對火災荷載比、截麵含管率和截麵邊長等對耐火性能的影響進行瞭有限元分析。研究結果錶明:噹火災荷載比減小、截麵含管率和截麵邊長增大時,火災作用下試件的軸嚮膨脹變形增大,軸嚮壓縮變形減小;在相同的升溫麯線和火災時間作用下,截麵邊長增大時,柱內溫度降低;含管率變化對柱內溫度場影響較小。火災荷載比、截麵邊長和長細比是影響軸心受壓方形截麵疊閤柱耐火性能的主要因素;含管率、縱觔配觔率和材料彊度變化對軸心受壓方形截麵疊閤柱耐火性能的影響較小。
위탐토축심수압방형절면강관혼응토첩합주적내화성능,대4근축심수압방형절면강관혼응토첩합주진행료시험연구,병대화재하재비、절면함관솔화절면변장등대내화성능적영향진행료유한원분석。연구결과표명:당화재하재비감소、절면함관솔화절면변장증대시,화재작용하시건적축향팽창변형증대,축향압축변형감소;재상동적승온곡선화화재시간작용하,절면변장증대시,주내온도강저;함관솔변화대주내온도장영향교소。화재하재비、절면변장화장세비시영향축심수압방형절면첩합주내화성능적주요인소;함관솔、종근배근솔화재료강도변화대축심수압방형절면첩합주내화성능적영향교소。
In order to research the fire resistance performance of concrete-filled steel tube reinforced concrete (CFSTRC)square columns under axial loading,fire resistance tests of four CFSTRC square columns subjected to axial load were conducted. The effects of axial loading level,steel tube area ratio and side length of cross section on the fire resistance performance were discussed by numerical simulations. The research results show that axial expansion deformations of CFSTRC square columns increase and their axial compression deformations decrease with minishing of axial loading level and raisings of steel tube area ratio and side length of cross section under fire exposure. Under the same elevated temperature curve and fire exposure time,a large side length of cross section will result in low temperature inside the square columns,and steel tube area ratio has a slight influence on the temperature distribution of CFSTRC square columns. Axial loading level,side length of cross section and slenderness ratio have great effects on the fire resistance performance of CFSTRC square columns under axial loading,while steel tube area ratio,reinforcement ratio and material strength have a slight influence on the fire resistance performance.