沙漠砂替代率对沙漠砂混凝土动态特性影响数值模拟.pdf

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1、2017年第3期(总第329期)Number3in2017(TotalNo．329)混凝土Concrete理论研究THEORETICALRESEARCHdoi：t0．3969／j．issn．1002-3550．2017．03．016沙漠砂替代率对沙漠砂混凝土动态特性影响数值模拟刘海峰，王亿颖，宋建夏(宁夏大学土木与水利工程学院，宁夏银川750021)摘要：沙漠砂混凝土动态特性非常复杂。将沙漠砂混凝土看作水泥砂浆和粗骨料组成二相复合材料，利用ANsYs／LS．DYNA对试件尺寸、沙漠砂替代率和粗骨料体积含量不同

2、沙漠砂混凝土动态破坏过程进行模拟，分析试件尺寸、沙漠砂替代率和粗骨料体积含量对沙漠砂混凝土动态特性影响规律，并对沙漠砂替代率不同沙漠砂混凝土动态破坏模式进行探讨。研究表明：随着沙漠砂替代率增加，沙漠砂混凝土峰值应力呈先增大后减小趋势，沙漠砂替代率20％时，沙漠砂混凝土峰值应力达到最大；随着试件尺寸增大，沙漠砂混凝土峰值应力逐渐减小；保持沙漠砂替代率和试件尺寸不变，随着粗骨料体积含量增加，沙漠砂混凝土峰值应力呈先增大后减小趋势。关键词：沙漠砂混凝土；数值模拟；沙漠砂替代率；峰值应力中图分类号：TU528．01文

3、献标志码：A文章编号：1002—3550(2017)03—0063—05NumericalsimulationofdynamicpropertiesofdesertsandconcretewithvariousdesertsandreplacementratiosunderimpactloadingLIUHaifeng，WANGYiying，SONGJianxia(SchoolofCivilandHydraulicEngineering，NingxiaUniversity，Yinchuan750021，Chi

4、na)Abstract：Thedynamicpropertiesofdesertsandconcreteareverycomplex．Desertsandconcretewasconsideredasatwo-phasecompositeconsistingofcementmortarandcoarseaggregate．Thefailureprocessesofdesertsandconcretewithdifferentspecimendimension，desertsandreplacementrati

5、oandthefractionofcoarseaggregateparticleunderimpactloadingsweresimulatedbymeansofANSYS／LS—DYNAsotb,vare．Theinfluenceofspecimendimension，desertsandreplacementratioandthefractionofcoarseaggregatepanicleonthedynamicpropertiesofdesertsandconcretewereanalyzed．Th

6、efailuremodeofdesertsandconcretewithvariousdesertsandreplacementratioswasdiscussed．Simulatedresultsshowthatwimtheenhancementofdesertsandreplacementratio．thepeakstressofdesertsandconcreteincreasesfirstly，andthendeclines．Whendesertsandreplacementratioisequalt

7、o20％，thepeakStressofdesertsandconcretereachesthemaximumvalue．Thepeakstressesofdesertsandconcretedeclinewiththespecimendimension．Desertsandreplace—meritratioandspecimendimensionbeingkeptunchanged，thepeakstressofdesertsandconcretewithvariousdesertsandreplacem

8、entra-tioincreasesfirstly．andthendeclineswinlthefractionofcoarseaggregateparticle．Keywords：desertsandconcrete；numericalsirnulation；desertsandreplacementratio；peakstress0引言混凝土作为一种建筑材料，以其施工方便、耐久性好、价格低廉等优