摘要
为探究非规则空间异型钢-拱梁组合体系桥的静力及动力承载性能,采用有限元分析软件Midas Civil建立某大桥的空间三维模型,通过数值仿真模拟动力及静力荷载试验,分析拱梁组合体系桥拱肋、主梁关键截面内力、变形及应变分布规律,结合主要受力构件特征截面影响线分布,给出静力荷载的布设位置及加载方法,并验算讨论加载效率。研究结果表明:在试验荷载作用下,空间异型钢拱-梁组合体系桥拱肋在1#跨和2#跨拱脚最大正弯矩分别为1 032.1 kN·m、1 704.8 kN·m,在1#跨中和2#跨中最大负弯矩分别为-464.1 kN·m、-2 670.8 kN·m,主梁在1#跨中、1#墩顶和2#跨中最大正(负)弯矩分别为2 136.7 kN·m、-2 063.4 kN·m和3 748.6 kN·m, 4#(1#跨中)和8#吊杆(2#跨中)最大轴力分别为131.2 kN和241.9 kN,不同特征截面荷载效率为0.87~1.01,满足现行桥梁荷载试验要求。制定的静动力荷载试验方案合理可行,分级加载可确保荷载试验安全、高效。空间异形钢拱-梁组合体系桥造型美观,静力承载能力高,动力性能优越。
Static and dynamic load-carrying performance of irregular spatially shaped steel arch-beam composite system bridge,a 3D finite element was developed using the Midas Civil.Numerical simulations were conducted to simulate dynamic and static load tests,analyzing the internal force,deformation,and strain distribution patterns of key sections in the arch ribs and main beams of the arch-truss composite system bridge.By combining the influence line distributions of characteristic cross-sections of the primary load-bearing components,the optimal placement positions and loading methods for static loads were explored and proposed,and the loading efficiency was verified and discussed.The research results indicate that under the action of experimental loads,the maximum positive bending moments of the spatially shaped steel arch-beam composite system bridge at the arch feet of spans#1 and#2 are 1032.1 kN·m and 1704.8 kN·m,respectively.The maximum negative bending moments at the arch top of spans#1 and#2 are-464.1 kN·m and-2670.8 kN·m,respectively.The maximum positive(negative)bending moments of the main beam at the mid span#1,pier top#1,and mid span#2 are 2136.7 kN·m,-2063.4 kN·m,and 3748.6 kN·m,respectively.The maximum axial forces of the suspension rods of#4 and#8 are 131.7 kN·m and 241.9 kN,respectively,with different characteristic section load efficiencies ranging from 0.87 to 1.01,meet the current requirements for bridge load testing.The formulated static and dynamic load testing scheme is reasonable and feasible,and graded loading can ensure safe and efficient load testing.The spatial irregular steel arch-beam composite system bridge has a beautiful appearance,high static bearing capacity,and superior dynamic performance.
作者
翟朝龙
张新军
王建望
ZHAI Chaolong;ZHANG Xinjun;WANG Jianwang(China Railway First Group Co.,Ltd.,Xi'an,Shaanxi 710055,China;School of Architectural Engineering,Yan'an University,Yan'an,Shaanxi 716000,China)
出处
《水利与建筑工程学报》
2025年第3期165-171,共7页
Journal of Water Resources and Architectural Engineering
基金
陕西省自然科学基础研究计划项目(2023-JC-YB-437)。
关键词
异型结构
拱梁组合体系
荷载试验
有限元分析
special structure
arch-beam composite system
load testing
finite element analysis
