大跨度钢桁梁柔性拱桥整体稳定性分析与参数研究  

OVERALL STABILITY ANALYSIS AND PAR AMETER STUDY OF A LONG-SPAN STEEL ARCH BRIDGE WITH TRUSS GIRDER

作　　者：刘郭周 亓艳生 傅中秋[2] 张留军 徐祥龙 张宏成 Liu Guo-zhou;Qi Yan-sheng;Fu Zhong-qiu;Zhang Liu-jun;Xu Xiang-long;Zhang Hong-cheng(Stecol Corporation,300384,Tianjin,China;Hohai University School of Civil Engineering and Transportation,210024,Nanjing,China;Powerchina Roadbridge Group Co.,Ltd.,100048,Beijing,China)

机构地区：[1]中国电建市政建设集团有限公司,天津300384 [2]河海大学土木与交通学院,南京210024 [3]中电建路桥集团有限公司,北京100048

出　　处：《建筑技术》2025年第5期536-540,共5页Architecture Technology

摘　　要：为探究大跨度钢桁梁柔性拱桥的稳定性能,研究建立钢桁梁柔性拱桥数值分析模型,分析矢跨比、宽跨比、横向风阻力、钢材弹性模量,及横撑位置等参数对整体稳定性的影响。计算结果表明,矢跨比设计为0.25时,钢桁梁柔性拱桥的稳定性能相对优越。保持桥梁跨度不变,增加桥宽能有效提高钢桁梁柔性拱桥的整体稳定性,当宽跨比由1/8增加至1/3,对应线弹性稳定系数λ_(e)与非线性稳定系数λ_(cr)分别由8.25及3.32增加至12.57及8.51。常见阵风作用下,钢桁梁柔性拱桥的稳定性能基本不受影响,但当遭遇强台风,其失稳风险显著提高,其中风速50 m/s及60 m/s对应的λ_(cr)相较风速20 m/s时分别降低28%及69%。钢材弹模的小范围离散会影响钢桁梁柔性拱桥稳定性,当弹性模量由220 GPa降低至200 GPa,对应λ_(e)与λ_(cr)分别由11.80及8.71下降至10.73及5.63。实际施工前建议开展材性试验,确保结构的稳定性能满足设计要求。除此之外,合理选择横撑类型及数目,或控制横撑长细比均能有效改善钢桁梁柔性拱桥的稳定性能。To study the stability of long-span steel arch bridge with truss,a numerical model was established for the steel arch bridge with truss.The influence of the rise-span ratio,width-span ratio,lateral wind resistance,steel elastic modulus,and bracing configuration on the stability of steel arch bridge with truss was investigated.The calculation results indicate that a rise-span ratio of 0.25 provides relatively superior stability for the steel arch bridge with truss.Keeping structural span constant,the overall stability of the steel arch bridge with truss can be improve by increasing structural width.When the width-span ratio increases from 1/8 to 1/3,the linear elastic stability coefficientλ_(e) and the nonlinear stability coefficientλ_(cr) increase from 8.25 and 3.32 to 12.57 and 8.51.The stable safety of the steel arch bridge with truss is generally unaffected under common wind effects.However,when encountering the strong wind effects,its stable safety decreases significantly,in whichλ_(cr) corresponding to wind speeds of 50m/s and 60m/s decreases by 28%and 69%compared to a wind speed of 20 m/s.A small change in the steel elastic modulus also affects the stability of the steel arch bridge with truss.When the elastic modulus decreases from 220GPa to 200GPa,theλ_(e) andλ_(cr) decrease from 11.80 and 8.71 to 10.73 and 5.63.Therefore,it is recommended to conduct material tests before on-site construction to ensure that the structural stability meets the design requirements.Additionally,the reasonable selection of bracing types,quantities,and slenderness ratios can further improve the stability of the steel arch bridge with truss.

关 键 词：钢桁梁柔性拱桥 线弹性稳定性 非线性稳定性 数值模拟 

分 类 号：TU758.11[建筑科学—建筑技术科学]