Discrete Numerical Study on Type II Fracture of Partially Detached Concrete Panels in Cold Region  

作　　者：Huayi Zhang Maobin Song Lei Shen Nizar Faisal Alkayem Maosen Cao 

机构地区：[1]College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing,210024,China [2]Haihe River,Huaihe River and Xiaoqinghe River Basin Water Conservancy Management and Service Center of Shandong Province,Jinan,250100,China [3]College of Mechanics and Engineering Science,Hohai University,Nanjing,211100,China

出　　处：《Structural Durability & Health Monitoring》2025年第1期167-191,共25页结构耐久性与健康监测（英文）

基　　金：supported by the Project on Excellent Post-Graduate Dissertation of Hohai University,Nanjing,China(422003508);the Postgraduate Research&Practice Innovation Program of Jiangsu Province,China(SJCX23_0187;422003287);the National Natural Science Foundation of China(52250410359);Young Elite Scientists Sponsorship Program by Jiangsu Provincial Association for Science and Technology(TJ-2023-043).

摘　　要：When the upper chord beam of the beam-string structure(BSS)is made of concrete-filled steel tube(CFST),its overall stiffness will change greatly with the construction of concrete placement,which will have an impact on the design of the tensioning plans and selection of control measures for the BSS.In order to accurately obtain the bending stiffness of CFST beam and clarify its impact on the mechanical properties of composite BSS during con-struction,the influence of some factors such as height-width ratio,wall thickness of steel tube,elasticity modulus of concrete,and friction coefficient on the bending stiffness are analyzed parametrically by the numerical simula-tion technology based on an actual project.The calculation formula of the equivalent bending stiffness of CFST is also established through mathematical statistical simulation.Then,the equivalent bending stiffness is introduced into the construction and use stages of the composite BSS,respectively,and the mechanical properties such as prestress-tensioning control value,structural deformation,and internal force of key members are comparatively analyzed when adopting two different construction plans.Moreover,the optimal construction plan of concrete placementfirst and then prestress-tensioning is proposed.

关 键 词：Beam-string structure(BSS) concrete-filled steel tube(CFST) bending stiffness timing of concrete placement prestress-tensioning 

分 类 号：TU528[建筑科学—建筑技术科学]