简介:分别建立了钢弹簧浮置板轨道-桥梁耦合系统、弹性扣件轨道.桥梁耦合系统的有限元模型,分析比较了该2种轨道-桥梁耦合系统在不同桥梁支座下的振动特性。结果表明,桥梁弹性支座降低了系统的刚度,从而使系统的固有频率低于刚性支座下的固有频率;钢弹簧浮置板轨道.桥梁耦合系统的固有频率随着轨道板下弹簧刚度的增大而增大;扣件刚度的改变对于弹性扣件轨道-桥梁耦合系统的振动特性几乎没有影响;钢弹簧浮置板轨道-桥梁耦合系统以及弹性扣件轨道.桥梁耦合系统的固有频率均低于桥梁自身的固有频率。
简介:CorrosionbehaviourandbiofoulingcharacteristicsofmildsteelinthreedifferentcoastallocationsintheGulfofMannar,Indiahavebeenstudiedoveraperiodof24months.OysterfoulingwaspredominantatOpensea-Tuticorin,whilebarnaclefoulingwasdominantatbothMandapamandHarbour-Tuticorin.Therateofcorrosionfor24monthsexposureperiodwashighestatMandapam,wherefoulingwasminimal.Thesurfaceofthemildsteelwascharacterizedbyetchings&crevicesbeneaththehardfoulersattachedonit,atallthetestlocations.ThedepthofcrevicecausedbyhardfoulerswashigheratOpensea-TuticorinfollowedbyHarbour-TuticorinandMandapam.ThelossinultimatetensilestrengthwasmoreinOpensea-Tuticorinthantheothertwolocations.Corrosionbehaviourofmildsteelisdiscussedbasedonthevariationinthebiofoulingassemblageatthethreetestlocations.