Steel joints under extreme events: behaviour under fire and seismic actions

Funder

Organizational Unit

Publications

Experimental behaviour of standardised European end plate beam-to-column stel joints under arbitrary cyclic loading

Publication . Nogueiro, Pedro; Silva, Luís Simões; Bento, Rita; Simões, Rui

This work presents the results of the study of the six experimental tests of standardised end-plate beam-to-column steel joints under arbitrary cyclic loading. The experimental programme is divided into two groups, varying the column section size. Each group has the first monotonic test and two more cyclic tests with arbitrary loading. The results are presented in terms of M-Ø curves, main mechanical joint properties and same relevant illustrations are presented. Finally, some conclusions can be drawn.

2006Conference object

Open access

Comportamento cíclico de ligações metálicas

Publication . Nogueiro, Pedro

O interesse da investigação do comportamento de estruturas metálicas solicitadas a acções sísmicas é um tema actual constantemente lembrado por notícias que nos mostram a ocorrência frequente de sismos nas mais diversas regiões do mundo. Neste trabalho de doutoramento, descreve-se a execução de um programa experimental de ensaios de ligações metálicas à escala real, dividido em quatro séries totalizando um total de 13 ensaios, solicitados a acções cíclicas. Procurou-se com este programa de ensaios, conhecer e caracterizar o comportamento real das ligações ensaiadas. Paralelamente ao trabalho experimental, desenvolveu-se a implementação numérica de um modelo matemático, que permite simular o comportamento real das ligações metálicas. Este modelo foi incorporado num software de cálculo automático, para assim ser possível o estudo e análise da contribuição do comportamento real das ligações no comportamento global da estrutura. Os ensaios experimentais levados a cabo neste trabalho, a par dos ensaios experimentais desenvolvidos por outros autores, permitiram definir os parâmetros de calibração do modelo implementado. Por fim, e com base no trabalho desenvolvido, estudou-se a influência do comportamento real das ligações no desempenho sísmico de três estruturas metálicas solicitadas a acções sísmicas.

2009Doctoral thesis

Open access

Numerical implementation and calibration of a hysteretic model for cyclic response of end-plate beam-to-column steel joints under arbitrary cyclic loading

Publication . Nogueiro, Pedro; Silva, Luís Simões; Bento, Rita

This work presents the implementation and calibration of Modified Richard-Abbott model for cyclic response of four end-plate beam-to-column steel joints under arbitrary cyclic loading. The joints parameters are found and the comparison between the analytical hysteretic results and the experimental hysteretic results is made, as well as the hysteretic energy dissipated evaluated for each cycle and obtained for both type of analyses.

2006Conference object

Open access

Residual strength of a steel-concrete composite structure subjected to a design seismic event by fire

Publication . Nogueiro, Pedro; Santiago, Aldina; Silva, Luís Simões; Bento, Rita; Vila Real, Paulo M.M.

This paper presents a numerical investigation of the residual strength of a typical PR momentresistant multi-storey steel framed structure, subjected to a design seismic event followed by fire. In order to allow a calibration with some real results from fire tests on a natural scale, the architectural and structural definitions of the eight-storey steel Cardington building were chosen as the reference case, adapted to deal with basic seismic requirements. The seismic action was simulated with an artificial accelerogram with PGA of 0.6g, chosen to achieve significant energy dissipation in the joints. The adopted fire event is limited to an isolated compartment and it is defined as the natural fire observed during a full-scale fire test carried out at the BRE. Finally, the results are discussed in terms of robustness requirements for extreme events.

2005Conference object

Open access

Calibration of model parameters for the cyclic response of end-plate beam-to-column steel-concrete composite joints

Publication . Nogueiro, Pedro; Silva, Luís Simões; Bento, Rita; Simões, Rui

Composite joints, considering the composite action of steel and concrete, exhibit, in general, high strength and high ductility. As a consequence, the use of this type of joint has been increasing in many countries, especially in those that are located in earthquake-prone regions. In this paper, a hysteretic model with pinching is presented that is able to reproduce the cyclic response of steel and composite joints. Secondly, the computer implementation and adaptation of the model in a spring element within the computer code Seismosoft is described. The model is subsequently calibrated using a series of experimental test results for composite joints subjected to cyclic loading. Finally, typical parameters for the various joint configurations are proposed.

2009Journal article

Open access