钢管组合大跨越输电塔线体系抗震减震分析研究-防灾减灾工程及防护工程专业论文.docxVIP

广州大学丁学硕士学位论文Abstract 广州大学丁学硕士学位论文 Abstract Towers with Large Crossing Transmission lines(TLCTL)are high·rise and long span structural systems，which are widely used important lifeline power engineering establishment．It has important economic and SOcial significance to remain TLCTLs main structures safe and reliable under accidental earthquake．TLCTL iS 3一dimensional complicated tower—line coupled vibration system．which have an obvious characteristic iS continuum that it consists of high—rise steel towers and long span transmission lines．At present，the high—voltage transmission towers which are TLCTLs main supporting parts， are usually assembled by steel angles at home and abroad．Lately,steel tube towers and combo steel tube towers are extensively adopted in transmission line engineering because steel tubes have good sectional mechanical property and beautiful external shapes．刀)e main reason to cause transmission tower to be failed is dynamic action besides static load． So to ensure TLCTL safe and reliable under accidental earthquake is paid more and more attention to by engineers and researchers． With ANSYS，a finite—element—method program，it is established a new analytical—numerical model combining beam and truss elements of combo steel tube TLCTL，which is one practical 220 kV transmission line eElga。neering over Pearl River． Dynamic characteristics of the TLCTL and single towers analyzed by subspace iteration method．By comparing the first period of theoretic value with that of approximate formula value，a revised approximate formula to estimate the 220SZK’S frec vibration period without cables is gained which improve result accuracy．Then，by analyzing parameter of the 1rICTL，s dynamic characteristics and single tower,qualitative coupled effects of the transmission lines on towers along transverse and longitudinal directions are obtained．In addition．by deducing the simplified fonnula of transmission lines tower which consulted interrelated theories and rescarches．a pra