交替支撐塔架主角鋼單肢計算長度系數(shù)研究.pdf

1、浙江大學(xué)建筑工程學(xué)院碩士學(xué)位論文交替支撐塔架主角鋼單肢計算長度系數(shù)研究姓名：羅澎申請學(xué)位級別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：童根樹20100118浙江大學(xué)碩士學(xué)位論文2010摘要EffectiveLengthofLegAngleswithAlternateSupportsinTransmissionTowersAbstractAngleiswidelyusedindesignofthevariousstructures，suchasroo

2、ftruss，raincovertransmissiontowerandSOonButduetothemonosymmetricaloftheanglesection，italwaysneedtoconsidertheeffectoftorsiontothebucklingloadinthedesignofcompressivemembers，becauseofthis，thecriterionusethemethodofconvers

3、iontheslendemessratioButtothebracedanglemembers，theeffectivelengthcannotsimplytakeasthegeometricallength【4】，SOthismethodcannotbeusedinthedesignofthebracedanglesdirectlyTothiskindofthestructure，Codefordesignofsteelstructu

4、re(GB500172003)didnotgivethespecificcalculatemethodortheeffectivelengthfactor，onlyintheCodefordesignoftallslenderstructures(GBJl3590)orthevariousreckoners，wecanfindtherequestoftheeffectivelengthfactorandtothetransmission

5、towerthat謝thalternatesupports，theeffectivelengthfactoris12，andtheradiusofgyrationtakealongtheparallelaxesButthereisnotanyexplanationtothevalueof12Inliterature[15]，withoutconsideringtheeffectoftorsiontheregivessomebucklin

6、gloadsofangelmembersindifferentspans、Ⅳithalternatesupports，andwecanfindthattheeffectivelengthfactorofthemisabout12Sowecanknowthatthevalue12inthecodeiscalculatedonlyconsiderthebendbyignoringtheeffectoftorsionHoweverInlite

7、rature【9】，byconsideringtheeffectoftorsiontothebucklingload，theregivestheeffectivelengthfactoroftheangleinKshapestructureAnditindicatesthattheeffectoftorsiontothebucklingloadishuge，anditwillchangeaswellastheslendernessrat

8、ioandflakinessratiosocannotsimplyuseaconstantvaluetodesignortakethegeometricallengthastheeffectivelengthfactortocalculateTherefore，tothetransmissiontower、Ⅳithalternatesupports，becauseofthesuppon，itcannotignoretheeffectof