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Influence of loading ratio on flat slab connections at elevated temperature:A numerical study

Frontiers of Structural and Civil Engineering 2020年第3期14卷 664-674页

作者： Rwayda Kh.S.AL-HAMD martin gillie Safaa Adnan MOHAMAD Lee S.CUNNINGHAM Mechanical Aerospace and Civil Engineering DepartmentSchool of EngineeringThe University of ManchesterManchester M139PLUK Prosthetics and Orthotics Engineering Deparment College of EngineeringAl-Nahrain UniversityBaghdad 10011Iraq Deparment of Mechanical and Consrruction Engineering Northumbria UniversityNewcastleNE18STUK Department of Highway and Transporation Engineering Al-Mustansiriyah UniversityBaghdad 10011lraq

For reinforced concrete members subjected to high temperature,the degree of in-service loading,commonly expressed as the loading ratio,can be highly influential on the structural *** particular,the loading ratio may be pivotal in relation to the phenomenon of load-induced thermal *** its potentially pivotal role,to date,the influence of the loading ratio on both material and structural behavior has not been explored in *** practice,real structures experience variation in imposed loading during their service life and it is important to understand the likely response at elevated temperatures across the loading *** this paper,the effect of the loading ratio is numerically investigated at both material and structural level using a validated finite element *** model incorporates a proposed constitutive model accounting for load-induced thermal strain and this is shown to outperform the existing Eurocode 2 model in terms of *** the validated model,the specific case of flats slabs and the associated connections to supporting columns at various loading ratios are *** the cases examined,a marked difference in the structural behavior including displacement direction was captured from low to high loading ratios consistent with experimental observations.

关键词： concrete finite clements fire load-induced thermal strain punching shear

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