摘要
为保证混合梁在钢混结合段内力传递平顺,本文以海南省琼海市博鳌乐城先行区乐城大桥为依托工程,通过模型试验和精细化有限元分析研究了自锚式悬索桥钢混结合段的受力特性。根据应力等效原则设计制作部分截面1∶4缩尺试验模型,分级加载至1.7倍承载力工况得到试验模型的应力、变形、破坏模式并与有限元分析结果对比,建立全桥截面节段模型分析钢混结合段的传力机理。结果表明:承载力工况下,乐城大桥钢混结合段受力合理、结构安全;该钢混结合段受负弯矩影响大,潜在破坏模式为钢梁顶板与混凝土梁顶板在钢-混连接面的分离;预应力钢束是保证弯矩传递的重要措施,其余钢梁内力通过承压板与剪力钉逐步传递至混凝土。本文研究成果可为同类桥梁的设计优化和施工监控提供参考。
We studied the structural performance of steel-concrete composite segments in a self-anchored suspension bridge through a model test based on the Lecheng Bridge in Lecheng Pioneer District,Boao,Qionghai City,Hainan Province,and refined finite element analysis to ensure the smooth transfer of internal force in steel-concrete composite segments in hybrid girders.First,a partial section 1∶4 scaled test model was designed and fabricated in accordance with the principle of stress equivalence between the original bridge and the scaled model.The specimen was then multistep loaded with up to 1.7 times the ultimate limit load.The stress,deformation,and failure modes obtained from the experiment were compared with those acquired from finite element analysis.Finally,a segmental model with a whole section width was established to explore the transmission mechanism of internal forces.Results showed that under load-bearing conditions,the stress distribution in the composite segment was rational,and the structure was safe.Given that the stress in this particular composite segment was highly affected by the hogging moment,the potential failure mode was the slip between the steel and concrete top flanges at the steel-concrete joint section.Prestress tendons were essential for bending moment transmission,whereas other internal forces were gradually transmitted to concrete by the bearing plate and shear studs.These results can provide references for the design optimization and construction control of similar bridges.
作者
陈华婷
李德旺
孙平宽
于德恩
张文学
CHEN Huating;LI Dewang;SUN Pingkuan;YU Deen;ZHANG Wenxue(Faculty of Urban Construction,Beijing University of Technology,Beijing 100124,China;China Highway Engineering Consulting Corporation,Beijing 100089,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2023年第5期837-846,856,共11页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(52278137)。
关键词
桥梁工程
自锚式悬索桥
钢混结合段
缩尺试验
有限元分析
受力性能
承载力
破坏模式
bridge engineering
self-anchored suspension bridge
steel-concrete composite segment
scaled model test
finite element analysis
structural performance
bearing capacity
failure mode
