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Blast modelling of steel frames with simple connections

Blast modelling of steel frames with simple connections
Blast modelling of steel frames with simple connections
This paper is concerned with the problem that structural joints in whole-frame models cannot at present be modelled in sufficiently minute detail to realistically represent their behaviour. It is well recognised that the structural joints represent the weakest link in building frames; therefore frame models are potentially inaccurate in a critical area. The impact of this research is in the development of an accurate frame modelling approach that achieves a realistic treatment of joint response without significantly increasing the computational requirements. The method utilises simplified connection models using rate dependent non-linear springs which, when assembled, allow a realistic representation of the connection behaviour. The method is found to be capable of modelling strain-rate dependent material property effects with a high degree of accuracy; as well as coping adequately with the force and rotation combinations which develop during blast response. Increased rotation rate, which occurs as a response to blast loading, is shown to modify the rotational stiffness in joints which can in turn lead to increased dynamic shear forces. Structural models which over-simplify joint stiffness and which ignore strain rate effects are shown to lead to potentially unsafe solutions
0733-9445
04013027-[11pp]
Stoddart, E.P.
b0c11411-0cff-4cd6-99a9-ec282ecd625e
Byfield, M.P.
35515781-c39d-4fe0-86c8-608c87287964
Tyas, A.
1ccff495-33f4-42f4-8aee-3bd791ae401e
Stoddart, E.P.
b0c11411-0cff-4cd6-99a9-ec282ecd625e
Byfield, M.P.
35515781-c39d-4fe0-86c8-608c87287964
Tyas, A.
1ccff495-33f4-42f4-8aee-3bd791ae401e

Stoddart, E.P., Byfield, M.P. and Tyas, A. (2012) Blast modelling of steel frames with simple connections. Journal of Structural Engineering, n/a, 04013027-[11pp]. (doi:10.1061/(ASCE)ST.1943-541X.0000778).

Record type: Article

Abstract

This paper is concerned with the problem that structural joints in whole-frame models cannot at present be modelled in sufficiently minute detail to realistically represent their behaviour. It is well recognised that the structural joints represent the weakest link in building frames; therefore frame models are potentially inaccurate in a critical area. The impact of this research is in the development of an accurate frame modelling approach that achieves a realistic treatment of joint response without significantly increasing the computational requirements. The method utilises simplified connection models using rate dependent non-linear springs which, when assembled, allow a realistic representation of the connection behaviour. The method is found to be capable of modelling strain-rate dependent material property effects with a high degree of accuracy; as well as coping adequately with the force and rotation combinations which develop during blast response. Increased rotation rate, which occurs as a response to blast loading, is shown to modify the rotational stiffness in joints which can in turn lead to increased dynamic shear forces. Structural models which over-simplify joint stiffness and which ignore strain rate effects are shown to lead to potentially unsafe solutions

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More information

e-pub ahead of print date: 22 November 2012
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 350218
URI: https://eprints.soton.ac.uk/id/eprint/350218
ISSN: 0733-9445
PURE UUID: fb8b32a5-8389-4aef-9a9a-9ed647b1acbc
ORCID for M.P. Byfield: ORCID iD orcid.org/0000-0002-9724-9472

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Date deposited: 20 Mar 2013 16:35
Last modified: 18 Jul 2019 00:57

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