Stiffness, strength and rotation capacity of a certain class of joints in steel structures with composite slabs

Wioleta Barcewicz

Abstract

Investigations of the present PhD thesis concern the behaviour of a certain class of semi-rigid composite steel-concrete beam-to-column joints. The class of bolted end-plate joints considered herein uses end-plates of the thickness being smaller than that used nowadays in practical applications and ranging from 40 to 60% of the bolt diameter as well as applied to unstiffened column web panels. The concrete slab is cast on the dip-profiled sheeting, using the Cofraplus 60 composite flooring. The present dissertation is an effort of a complex research including analytical, numerical and experimental joint behaviour parts in which the influence of the thickness and the height of endplates as well as the reinforcement ratio is examined and discussed in details. The experimental investigations of the considered class of composite end-plate joints are carried out in order to observe the important behavioural issues of joints and their components under increasing loads and to identify the main deformation sources and failure modes. The purpose is to determine experimentally the M-f relationships. They are used as the basis for the comparison with models developed to predict the joint behaviour. A verification of the analytical models describing the behaviour of the composite steelconcrete joints is presented. The first model is based on the recommendations according to Eurocodes, while the second one is a generalized proposal in which some parameters describing the shape of M-f curve in the elastic and inelastic regions are re-evaluated. Both models are compared with the experimental M-f curves of tested beam-to-column joints. From this comparison, one can conclude that the reinforcement ratio is the decisive parameter for the analytical model to be proposed. Numerical simulations are carried out to study the behaviour of steel and composite joints with the usage of general purpose FE software ABAQUS. A validation exercise is conducted by comparing the results obtained numerically with those recorded in the experimental investigations. Comparison is made in terms of the moment-rotation characteristics of these joints. Obtained FE results show a good agreement between the predicted and measured responses, which gives a confidence that the FE technique developed is capable of predicting the composite joints responses with an acceptable degree of accuracy from the engineering practice point of view.
Diploma typeDoctor of Philosophy
Author Wioleta Barcewicz (FCE / ICE)
Wioleta Barcewicz,,
- The Institute of Civil Engineering
Title in EnglishStiffness, strength and rotation capacity of a certain class of joints in steel structures with composite slabs
Languagepl polski
Certifying UnitFaculty of Civil Engineering (FCE)
Disciplineconstruction / (technology domain) / (technological sciences)
Defense Date14-07-2010
Supervisor Marian Giżejowski (FCE / ICE)
Marian Giżejowski,,
- The Institute of Civil Engineering

Internal reviewers Wojciech Żółtowski (FCE)
Wojciech Żółtowski,,
- Faculty of Civil Engineering
External reviewers Jerzy Ziółko - [Uniwersytet Technologiczno-Przyrodniczy im. Jana i Jędrzeja Śniadeckich w Bydgoszczy (UTP)]
Jerzy Ziółko,,
-
- Uniwersytet Technologiczno-Przyrodniczy im. Jana i Jędrzeja Śniadeckich w Bydgoszczy
Pages351
Keywords in Englishxxx
Abstract in EnglishInvestigations of the present PhD thesis concern the behaviour of a certain class of semi-rigid composite steel-concrete beam-to-column joints. The class of bolted end-plate joints considered herein uses end-plates of the thickness being smaller than that used nowadays in practical applications and ranging from 40 to 60% of the bolt diameter as well as applied to unstiffened column web panels. The concrete slab is cast on the dip-profiled sheeting, using the Cofraplus 60 composite flooring. The present dissertation is an effort of a complex research including analytical, numerical and experimental joint behaviour parts in which the influence of the thickness and the height of endplates as well as the reinforcement ratio is examined and discussed in details. The experimental investigations of the considered class of composite end-plate joints are carried out in order to observe the important behavioural issues of joints and their components under increasing loads and to identify the main deformation sources and failure modes. The purpose is to determine experimentally the M-f relationships. They are used as the basis for the comparison with models developed to predict the joint behaviour. A verification of the analytical models describing the behaviour of the composite steelconcrete joints is presented. The first model is based on the recommendations according to Eurocodes, while the second one is a generalized proposal in which some parameters describing the shape of M-f curve in the elastic and inelastic regions are re-evaluated. Both models are compared with the experimental M-f curves of tested beam-to-column joints. From this comparison, one can conclude that the reinforcement ratio is the decisive parameter for the analytical model to be proposed. Numerical simulations are carried out to study the behaviour of steel and composite joints with the usage of general purpose FE software ABAQUS. A validation exercise is conducted by comparing the results obtained numerically with those recorded in the experimental investigations. Comparison is made in terms of the moment-rotation characteristics of these joints. Obtained FE results show a good agreement between the predicted and measured responses, which gives a confidence that the FE technique developed is capable of predicting the composite joints responses with an acceptable degree of accuracy from the engineering practice point of view.
Thesis file
Barcewicz.pdf 47.97 MB

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