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1、学位论文受冲击格构式钢拱弹塑性失稳数值模拟与试验研究StudyonElastic-plasticBuckingofSteelLatticeArchAffectedbyImpact:SimulationandExperiment本文首先使用ABAQUS/Explicit模拟了刚体横向冲击弹塑性格构式钢拱的过程，研究了各种因素对冲击响应的影响,得出：随着冲击速度的增加，刚体块嵌入格构拱拱顶钢管深度逐渐增大，冲击荷载最大峰值和冲击接触时间亦显著增大；随着质量比的增加，刚体块嵌入深度和冲击荷载最大峰值逐渐减小，接触时间增大；随着矢跨比的
2、增大，冲击荷载最大峰值和接触时间逐渐减小，刚体块嵌入深度增大；随着格构拱跨度的增大，冲击荷载最大峰值、接触时间和刚体块嵌入深度都逐渐增大；随着格构拱壁厚的增大，冲击荷载最大峰值逐渐增大，刚体块嵌入深度和接触时间逐渐减小。本文通过分析刚体冲击弹塑性格构式钢拱过程，提出了基于整体变形和内能判断弹塑性格构拱动力屈曲的判别准则。根据判别准则得出：随着冲击速度和刚体质量的增大，屈曲时间减小；随着刚体块的质量增大，临界冲击速度减小，当刚体块质量较大时，临界屈曲速度变化较小。采用应变电测技术对格构式钢拱在冲击作用下的动力响应进行试验研究，发现
3、格构式钢拱在落锤的冲击作用下结构破坏形式有两种情况，分别为：（1）支座处破坏；（2）弹塑性大变形破坏。在两种破坏形式下结构均发生整体失稳，且为平面外失稳。关键词：格构式钢拱，冲击荷载，接触时间，动力屈曲，试验研究IIIAbstractThispaperfirstlyusedABAQUS/Explicittosimulatetheprocessofelastic-plasticsteellatticearchtransverselyimpactedbyrigidbody,andtheimpactresponseeffectedby
4、variousfactorswasstudied.Themainconclusionsareasfollows:whenthevelocityofrigidbodyisincreasing,thedepthembeddedbyrigidbodyinsteeltubeofthelatticearchvaultchangeslarger,theimpactloadpeakvaluechangesgreater,thecontacttimepresentsansignificantincrease;withtheincreaseofm
5、assratio,namelythequalityoftherigidblockissmaller,thedepthembeddedbyrigidbodyinsteeltubeofthelatticearchvaultandtheimpactloadpeakvaluechangesmaller,thecontacttimechangesshorter;withtheincreaseofrise-to-spanratio,theimpactloadpeakvalueandthecontacttimehavedecreased,th
6、edepthembeddedbyrigidbodychangesgreater;withtheincreaseoflatticearchspan,theimpactloadpeakvalue,thecontacttimeandthedepthembeddedbyrigidbodyallhavedecreased;withtheincreaseoflatticearchwallthickness,thecontacttimeandthedepthembeddedbyrigidbodyhavedecreased,theimpactl
7、oadpeakvaluechangesgreater.Andthepaperanalyzedtheconclusionsinconsiderationoftheplasticdeformationandtheplasticdissipationenergy.Throughanalyzingtheprocessofelastic-plasticlatticearchimpactedbytherigidbody,thepaperproposedthedynamicbucklingjudgmentcriterionbasedonthe
8、overalldeformationandtheinternalenergy.Accordingtothejudgmentcriterion,themainconclusionsareasfollows:whenthevelocityofrigidbodyort
