世界桥梁
世界橋樑
세계교량
WORLD BRIDGE
2014年
4期
68-73
,共6页
铁路桥%钢箱叠合拱%矢跨比%拱肋内倾角%横撑连接方式%吊杆布置形式%拱肋系梁刚度比%力学性能%参数分析
鐵路橋%鋼箱疊閤拱%矢跨比%拱肋內傾角%橫撐連接方式%弔桿佈置形式%拱肋繫樑剛度比%力學性能%參數分析
철로교%강상첩합공%시과비%공륵내경각%횡탱련접방식%조간포치형식%공륵계량강도비%역학성능%삼수분석
railway bridge%steel box composite arch%rise-to-span ratio%inclination of arch rib%connecting way of lateral bracings%layout of hangers%ratio of arch rib and tie beam stiffness%mechanical behavior%parametric analysis
为了解结构设计参数对高速铁路钢箱叠合拱桥结构力学特性的影响，进而指导结构设计，以哈大高速铁路新开河桥（拱肋由上、下拱肋构成的新型桥梁）为工程背景，分析矢跨比、拱肋内倾角、横撑布置方式、吊杆布置形式、拱肋系梁刚度比等设计参数对该结构体系力学特性的影响。分析结果表明：矢跨比对拱脚内力影响较大，取值为1/5左右时较合理；拱肋内倾角对结构稳定与侧弯基频的影响较显著；横撑的数量、间距、刚度与布置方案对结构稳定性有显著影响，加强肋间横撑的横向或竖向连接均能有效地提高结构的稳定性；刚性吊杆的结构稳定性最好，柔性吊杆布置形式对结构竖弯基频与扭转基频影响较大；拱肋系梁刚度比对内力分布影响显著。
為瞭解結構設計參數對高速鐵路鋼箱疊閤拱橋結構力學特性的影響，進而指導結構設計，以哈大高速鐵路新開河橋（拱肋由上、下拱肋構成的新型橋樑）為工程揹景，分析矢跨比、拱肋內傾角、橫撐佈置方式、弔桿佈置形式、拱肋繫樑剛度比等設計參數對該結構體繫力學特性的影響。分析結果錶明：矢跨比對拱腳內力影響較大，取值為1/5左右時較閤理；拱肋內傾角對結構穩定與側彎基頻的影響較顯著；橫撐的數量、間距、剛度與佈置方案對結構穩定性有顯著影響，加彊肋間橫撐的橫嚮或豎嚮連接均能有效地提高結構的穩定性；剛性弔桿的結構穩定性最好，柔性弔桿佈置形式對結構豎彎基頻與扭轉基頻影響較大；拱肋繫樑剛度比對內力分佈影響顯著。
위료해결구설계삼수대고속철로강상첩합공교결구역학특성적영향，진이지도결구설계，이합대고속철로신개하교（공륵유상、하공륵구성적신형교량）위공정배경，분석시과비、공륵내경각、횡탱포치방식、조간포치형식、공륵계량강도비등설계삼수대해결구체계역학특성적영향。분석결과표명：시과비대공각내력영향교대，취치위1/5좌우시교합리；공륵내경각대결구은정여측만기빈적영향교현저；횡탱적수량、간거、강도여포치방안대결구은정성유현저영향，가강륵간횡탱적횡향혹수향련접균능유효지제고결구적은정성；강성조간적결구은정성최호，유성조간포치형식대결구수만기빈여뉴전기빈영향교대；공륵계량강도비대내력분포영향현저。
To investigate the impact of structural design parameters on the mechanical behavior of the high-speed railway steel box composite arch bridge and provide references to sample bridge , the Xinkaihe River Bridge on the Harbin-Dalian high-speed railway was taken as the sample bridge .The bridge takes a new type of structure ,the arch of which comprises the upper and lower arch ribs .T he impact of a series of design parameters on the mechanical behavior of such type of structure was analyzed ,including the rise-to-span ratio ,inclination of the arch ribs ,layout of the lateral bracings and the hangers and the ratio of the arch ribs and the tie beam stiffness .The re-sults of the analysis indicated that the rise-to-span ratio had prominent influence on the internal force of the arch springs and a rational value was considered around 1/5 .The inclination of the arch ribs showed significant impact on the stability and lateral bending fundamental frequency . T he amount ,spacing ,stiffness and layout of lateral bracings had obvious impact on the stability of the structure ,and strengthening the transverse and vertical connection of the lateral bracings be-tween the arch ribs would effectively enhance the stability of the structure .The rigid hangers had superior structural stability .The flexible layout of hangers showed great influence on the vertical fundamental frequency and torsional frequency of the structure .T he ratio of arch rib and tie beam stiffness had significant impact on the internal force distribution .
