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ID:33346565
大小:1.12 MB
页数:7页
时间:2019-02-25
《砂浆板冲击破坏试验研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、振动与冲击第34卷第6期JOURNALOFVIBRATIONANDSHOCKVol.34No.62015砂浆板冲击破坏试验研究1,21,211,21,2顾培英,邓昌,章道生,汤雷,王建(1.南京水利科学研究院,南京210029;2.水利部水科学与水工程重点实验室,南京210029)摘要:通过锤击、均匀冲击荷载试验,采用逐级递增循环冲击加载方式,研究冲击荷载下砂浆板的破坏特征及冲击力、冲击能与最大加速度响应间
2、关系。试验表明,二种冲击作用均使砂浆板跨中区域出现贯穿裂缝,呈脆性劈裂破坏形态,均匀冲击作用下破坏位置与跨中有一定偏移;锤击力时程经历主冲击、次冲击、卸载三阶段,加速度响应随锤击力增加而增加,裂缝贯穿后冲击力、加速度响应大幅减小;均匀冲击下加速度有二组响应区,响应随冲击能增加而增加,当冲击能达一定程度时响应大幅减小;继续增加冲击能,响应又会增加,并较快发生劈裂破坏,响应大幅减小;支座螺栓松动能缓冲部分冲击作用。关键词:冲击荷载;振动;破坏;砂浆板中图分类号:TV32文献标志码:ADOI:10.13465/
3、j.cnki.jvs.2015.06.034Damagetestsforacementmortarplateundershockload1,21,211,21,2GUPeiying,DENGChang,ZHANGDaosheng,TANGLei,WANGJian(1.NanjingHydraulicResearchInstitute,Nanjing210029,China;2.KeylaboratoryofWaterScienceandEngineering,MinistryofWaterResour
4、ces,Nanjing210029,China)Abstract:Hammeringanduniformshocktestsofacementmortarplatewereconducled.Theoppositesidesoftheplatewereelasticsupports.Throughcyclicshockswithamplitudeincreasing,thefailurefeatures,therelationshipbetweenshockforceandaccelerationresp
5、onse,andtherelationshipbetweenimpactenergyandaccelerationresponseoftheplatewerestudied.Theresultsshowedthatatransversecracknearbythemidspanoftheplateappears,itsfailurestateisbrittlesplitting;thelocationoffailureoffsetsthemidspanunderuniformshock;timehisto
6、rycurvesofthehammeringforceincludethreestagesofmajorshock,secondaryshockandunloading;theaccelerationresponseoftheplateincreaseswithincreaseinthehammeringforce,however,thehammeringforceandaccelerationresponsedecreaseobviouslyafterthetransversecrackappears;
7、therearetwogroupsofaccelerationresponseregionsunderuniformshock;theaccelerationresponseincreaseswithincreaseinimpactenergy;onceimpactenergyreachesacertainlevel,theaccelerationresponsedecreasesobviously;ifimpactenergycontinuouslyincreases,theaccelerationre
8、sponseincreasesagain,brittlesplittingfailureoccursrapidly,andtheaccelerationresponsedecreasesobviouslyagain;furthermore,supportboltlooseningcanabsorbsomeimpactenergy.Keywords:shockload;vibration;damage;cementmortarp
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