钢管超高强石渣混凝土轴压短柱静力性能试验研究
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摘要
通过14个钢管超高强石渣混凝土短柱试件的轴压试验,考察其破坏形态,分析混凝土强度、试件的直径、径厚比等参数对其力学特性的影响。试验结果表明:以较低的水泥消耗量配制的超高强石渣混凝土填充至钢管内,钢管与核心混凝土界面密实,没有脱空的现象;在试验参数范围内,试件的套箍指标和混凝土强度是影响其静力特性的主要因素,试件的峰值荷载、低谷荷载及二次峰值荷载与核心混凝土的名义承载力(fcAc)之比基本与套箍指标成线性关系,但变化规律有别;试件的荷载-轴向平均应变曲线可以分为四个阶段,即弹性阶段、弹塑性阶段、荷载下降阶段和荷载回升阶段;套箍指标较小时,弹塑性段较短,下降段陡峭,峰值荷载后荷载下降幅值较大;套箍指标较大时,弹塑性上升段和荷载下降变形曲线较平缓,峰值荷载后荷载下降幅值较小;所有试件都呈剪切型的破坏特征,有较高的残余承载力和良好的延性;最后,给出了经回归分析得到与试验结果比较吻合的钢管超高强石渣混凝土短柱轴心受压承载力的计算公式。
Based on the experimental studies of 14 short steel tubular columns filled with ultra-high strength concrete mixed with stone-chip(abbreviated as SSTCFUSCMS),this paper describes the failure mode of this type of short columns subjected to axial load.The influences of the concrete strength,diameter and diameter-thickness ratio of the steel tube on the static properties of the specimens are also analyzed.It is found that it is possible to eliminate the disengaging at the interface of steel tube and the core concrete by filling ultra-high strength concrete mixed with stone-chip(abbreviated as USCMS) with reduced consumption of cement.Within the scope of the test parameters,both the confinement index and the concrete strength have great influence on the features of the SSTCFUSCMS specimens subjected to axial load.The respective ratios of the peak load,the lower yield load and the peak load in the ascent process of its carrying capacity to the nominal bearing capacity(i.e.fcAc) of the core concrete are almost linearly proportional to the confinement index of the specimens following different rules.Experimental results show that the load versus average strain curves of the specimens should be divided into four stages: the elastic deformation stage,the elasto-plastic deformation stage,the descent stage and the recovery stage of the loading carrying capacity.The specimens with lower confinement index exhibit a rapid softening process in the post-peak region with a towering peak and a shorter incremental portion plus the weak recovery in the forth stage.The specimens with higher confinement index exhibit a gradual softening process in the post-peak region with a chubby curve and a longer incremental portion plus the strong momentum of recovery in the forth stage.The experimental observations indicate that all specimens have high residual load carrying capacity and excellent ductility.Then the formula for predicting the ultimate load carrying capacity is developed by regression analysis based on the experimental results.The calculated results have a good agreement with the experimental results.
Based on the experimental studies of 14 short steel tubular columns filled with ultra-high strength concrete mixed with stone-chip(abbreviated as SSTCFUSCMS),this paper describes the failure mode of this type of short columns subjected to axial load.The influences of the concrete strength,diameter and diameter-thickness ratio of the steel tube on the static properties of the specimens are also analyzed.It is found that it is possible to eliminate the disengaging at the interface of steel tube and the core concrete by filling ultra-high strength concrete mixed with stone-chip(abbreviated as USCMS) with reduced consumption of cement.Within the scope of the test parameters,both the confinement index and the concrete strength have great influence on the features of the SSTCFUSCMS specimens subjected to axial load.The respective ratios of the peak load,the lower yield load and the peak load in the ascent process of its carrying capacity to the nominal bearing capacity(i.e.fcAc) of the core concrete are almost linearly proportional to the confinement index of the specimens following different rules.Experimental results show that the load versus average strain curves of the specimens should be divided into four stages: the elastic deformation stage,the elasto-plastic deformation stage,the descent stage and the recovery stage of the loading carrying capacity.The specimens with lower confinement index exhibit a rapid softening process in the post-peak region with a towering peak and a shorter incremental portion plus the weak recovery in the forth stage.The specimens with higher confinement index exhibit a gradual softening process in the post-peak region with a chubby curve and a longer incremental portion plus the strong momentum of recovery in the forth stage.The experimental observations indicate that all specimens have high residual load carrying capacity and excellent ductility.Then the formula for predicting the ultimate load carrying capacity is developed by regression analysis based on the experimental results.The calculated results have a good agreement with the experimental results.
引文
[1]蒲心诚.超高强高性能混凝土[M].重庆:重庆大学出版社,2004.(Pu Xincheng.Super high strength highperformance concrete[M].Chongqing:ChongqingUniversity Press,2004.(in Chinese))
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[4]Pierre Richard,Marcel Cheyrezy.Composition ofreactive powder concretes[J].Cement and ConcreteResearch,1995,25(7):1501-1511.
[5]陈国灿.钢管聚丙烯纤维超高强石渣混凝土短柱的静力特性[J].武汉大学学报:工学版,2010,43(5):617-622.(Chen Guo-can,Experimental studieson the behaviors of PFRGSHSCUS filled with steel tubesshort columns subjected to axial load[J].EngineeringJournal of Wuhan University,2010,43(5):617-622.(in Chinese))
[6]陈国灿,徐志胜.高温后钢管超高强石渣混凝土短柱的轴压性能[J].三峡大学学报:自然科学版,2010,32(6):36-41.(Chen Guo-can,Xu Zhi-sheng.Experimental studies on the behaviors of GSHSCUSfilled with steel tubes short columns after hightemperature[J].Journal of China Three GorgesUniversity:Natural Science,2010,32(6):36-41.(inChinese))
[7]陈国灿.低碳超高强石渣混凝土的抗火性能研究[J].武汉工程大学学报,2010,32(11):36-41.(Chen Guo-can.Experimental studies on the frebehavior of geen super high strength concrete usedstone-chip at elevated temperature[J].Journal ofWuhan Institute Technology,2010,32(11):36-41.(inChinese))
[8]陈国灿.低碳超高强石渣混凝土的配制技术研究[J].湘潭大学学报:自然科学学报,2010,32(4):58-63.(Chen Guo-can.Experimental studies on themix technology of green super high strength concreteused stone-chip[J].Journal of Xiangtan University:Natural Science,2010,32(4):58-63.(in Chinese))
[9]冯乃谦.高性能混凝土与超高性能混凝土的发展和应用[J].施工技术,2009,38(4):1-6.(FengNaiqian.Development and application of highperformance concrete and ultra-high performanceconcrete[J].Construction Technology,2009,38(4):1-6.(in Chinese))
[10]蔡绍怀.现代钢管混凝土结构[M].修订版.北京:人民交通出版社,2007.(Cai Shaohuai.Modern steeltube confined concrete structures[M].RevisedEdition.Beijing:China Communications Press,2007.(in Chinese))
[11]田志敏,张想柏,冯建文,等.钢管超高性能RPC短柱的轴压特性研究[J].地震工程与工程振动,2008,28(1):99-107.(TIAN Zhimin,ZHANG Xiangbai,FENG Jianwen,et al.Characteristics of RPC-filledsteel tubular puncheons with ultra high performancesubjected to axial compressive loading[J].Journal ofEarthquake Engineering and Engineering Vibration,2008,28(1):99-107.(in Chinese))
[12]谭克锋,蒲心诚,蔡绍怀.钢管超高强混凝土的性能与极限承载能力[J].建筑结构学报,1999,20(1):10-20.(TAN Kefeng,PU Xincheng,CAI Shaohuai.Study on the mechanical properties of steel extra-highstrength concrete encased in steel tubes[J].Journal ofBuilding Structures,1999,20(1):10-20.(inChinese))
[13]谭克锋,蒲心诚.钢管超高强混凝土长柱和偏压柱的性能与极限承载力的研究[J].建筑结构学报,2000,21(2):12-19.(TAN Kefeng,PU Xincheng.Study on behavior and load bearing capacities of slendersteel tubular columns and eccentrically loaded steeltubular columns filled with extra-high strength concrete[J].Journal of Building Structures,2000,21(2):12-19.(in Chinese))
[14]钟善桐.高层钢管混凝土结构[M].哈尔滨:黑龙江科学技术出版社,1999.(ZHONG Shantong.Concretefilled steel tubular structures for high-rise buildings[M].Harbin:Heilongjiang Science and TechnologyPress,1999.(in Chinese))
[15]CECS 28:90钢管混凝土结构设计与施工规程[S].(CECS 28:90 Specification for design andconstruction of concrete-filled steel tubular structures[S].(in Chinese))
[16]CECS 104:99高强混凝土结构技术规程[S].(CECS 104:99 Technical specification for high-strength concrete structures[S].(in Chinese))
[17]Eurocode 4 Design of composite steel and concretestructures[S].
[18]AISC-LRFD(1999)Load and resistance factor designspecification for structural steel buildings[S].American Institute of Steel Construction,INC,1999.
[2]陈国灿.低碳超高强石渣混凝土的力学性能试验研究[J].佳木斯大学学报:自然科学版,2010,28(5):693-697.(Chen Guo-can.Experimental studies on themechanical properties of green super high strengthconcrete used stone-chip[J].Journal of JiamusiUniversity:Natural Science Edition,2010,28(5):693-697.(in Chinese))
[3]陈国灿,徐志胜.预制钢管超高强石渣混凝土叠合柱的轴压试验[J].厦门大学学报:自然科学版,2010,49(6):819-825.(Chen Guo-can,Xu Zhi-sheng.Experimental studies on the axial pressure behaviors ofcomposition columns reinforced with the prefabricatedGSHSCUS filled with steel tubes[J].Journal of XiamenUniversity:Natural Science,2010,49(6):819-825.(in Chinese))
[4]Pierre Richard,Marcel Cheyrezy.Composition ofreactive powder concretes[J].Cement and ConcreteResearch,1995,25(7):1501-1511.
[5]陈国灿.钢管聚丙烯纤维超高强石渣混凝土短柱的静力特性[J].武汉大学学报:工学版,2010,43(5):617-622.(Chen Guo-can,Experimental studieson the behaviors of PFRGSHSCUS filled with steel tubesshort columns subjected to axial load[J].EngineeringJournal of Wuhan University,2010,43(5):617-622.(in Chinese))
[6]陈国灿,徐志胜.高温后钢管超高强石渣混凝土短柱的轴压性能[J].三峡大学学报:自然科学版,2010,32(6):36-41.(Chen Guo-can,Xu Zhi-sheng.Experimental studies on the behaviors of GSHSCUSfilled with steel tubes short columns after hightemperature[J].Journal of China Three GorgesUniversity:Natural Science,2010,32(6):36-41.(inChinese))
[7]陈国灿.低碳超高强石渣混凝土的抗火性能研究[J].武汉工程大学学报,2010,32(11):36-41.(Chen Guo-can.Experimental studies on the frebehavior of geen super high strength concrete usedstone-chip at elevated temperature[J].Journal ofWuhan Institute Technology,2010,32(11):36-41.(inChinese))
[8]陈国灿.低碳超高强石渣混凝土的配制技术研究[J].湘潭大学学报:自然科学学报,2010,32(4):58-63.(Chen Guo-can.Experimental studies on themix technology of green super high strength concreteused stone-chip[J].Journal of Xiangtan University:Natural Science,2010,32(4):58-63.(in Chinese))
[9]冯乃谦.高性能混凝土与超高性能混凝土的发展和应用[J].施工技术,2009,38(4):1-6.(FengNaiqian.Development and application of highperformance concrete and ultra-high performanceconcrete[J].Construction Technology,2009,38(4):1-6.(in Chinese))
[10]蔡绍怀.现代钢管混凝土结构[M].修订版.北京:人民交通出版社,2007.(Cai Shaohuai.Modern steeltube confined concrete structures[M].RevisedEdition.Beijing:China Communications Press,2007.(in Chinese))
[11]田志敏,张想柏,冯建文,等.钢管超高性能RPC短柱的轴压特性研究[J].地震工程与工程振动,2008,28(1):99-107.(TIAN Zhimin,ZHANG Xiangbai,FENG Jianwen,et al.Characteristics of RPC-filledsteel tubular puncheons with ultra high performancesubjected to axial compressive loading[J].Journal ofEarthquake Engineering and Engineering Vibration,2008,28(1):99-107.(in Chinese))
[12]谭克锋,蒲心诚,蔡绍怀.钢管超高强混凝土的性能与极限承载能力[J].建筑结构学报,1999,20(1):10-20.(TAN Kefeng,PU Xincheng,CAI Shaohuai.Study on the mechanical properties of steel extra-highstrength concrete encased in steel tubes[J].Journal ofBuilding Structures,1999,20(1):10-20.(inChinese))
[13]谭克锋,蒲心诚.钢管超高强混凝土长柱和偏压柱的性能与极限承载力的研究[J].建筑结构学报,2000,21(2):12-19.(TAN Kefeng,PU Xincheng.Study on behavior and load bearing capacities of slendersteel tubular columns and eccentrically loaded steeltubular columns filled with extra-high strength concrete[J].Journal of Building Structures,2000,21(2):12-19.(in Chinese))
[14]钟善桐.高层钢管混凝土结构[M].哈尔滨:黑龙江科学技术出版社,1999.(ZHONG Shantong.Concretefilled steel tubular structures for high-rise buildings[M].Harbin:Heilongjiang Science and TechnologyPress,1999.(in Chinese))
[15]CECS 28:90钢管混凝土结构设计与施工规程[S].(CECS 28:90 Specification for design andconstruction of concrete-filled steel tubular structures[S].(in Chinese))
[16]CECS 104:99高强混凝土结构技术规程[S].(CECS 104:99 Technical specification for high-strength concrete structures[S].(in Chinese))
[17]Eurocode 4 Design of composite steel and concretestructures[S].
[18]AISC-LRFD(1999)Load and resistance factor designspecification for structural steel buildings[S].American Institute of Steel Construction,INC,1999.
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