NUMERICAL INVESTIGATION OF THE SPACE-TRUSS WITH REINFORCE OF THE STAMPED CONNECTION AFTER CALIBRATION MODEL IN EXPERIMENTAL STUDY

NUMERICAL INVESTIGATION OF THE SPACE-TRUSS WITH REINFORCE OF THE STAMPED CONNECTION AFTER CALIBRATION MODEL IN EXPERIMENTAL STUDY

Freitas, C. A. S. de; Cavalcante, O.R.O.; Araujo, R. M.; Sousa, G. M. Araújo e E. C.

Full Article:

Space trusses consist of bars tubular section linking in the 3D form in the end members. There are several types of connections to attach these members. The most popular is the staking endflattened connection. The reduced cost and the fast assemblage of the truss are among the advantages of the staking end-flattened connection on 3D trusses. However, such connections present disadvantages like eccentricities and stiffness weakening of the tubular members. Several accidents in space structures using this type of connection have also been reported in Brazil. This research presents suggestions to ensure greater safety for truss structures that use the typical node. It is proposed, initially, the use of reinforcement and constructive correction in the connection in order to increase its capacity. The bases for this are the reduction in the eccentricity and the increase in the rigidity of the typical node connection. In this work, based on computer simulations after experimental lab tests, small changes on the staking end-flattened connections such as reinforcement and eccentricity correction are evaluated. The results show an increase of 68% for local collapse and 17% for global collapse in the truss load carrying capacity when the suggested changes proposed in this article are used for the staking end-flattened connections.

Space trusses consist of bars tubular section linking in the 3D form in the end members. There are several types of connections to attach these members. The most popular is the staking endflattened connection. The reduced cost and the fast assemblage of the truss are among the advantages of the staking end-flattened connection on 3D trusses. However, such connections present disadvantages like eccentricities and stiffness weakening of the tubular members. Several accidents in space structures using this type of connection have also been reported in Brazil. This research presents suggestions to ensure greater safety for truss structures that use the typical node. It is proposed, initially, the use of reinforcement and constructive correction in the connection in order to increase its capacity. The bases for this are the reduction in the eccentricity and the increase in the rigidity of the typical node connection. In this work, based on computer simulations after experimental lab tests, small changes on the staking end-flattened connections such as reinforcement and eccentricity correction are evaluated. The results show an increase of 68% for local collapse and 17% for global collapse in the truss load carrying capacity when the suggested changes proposed in this article are used for the staking end-flattened connections.

Palavras-chave:

DOI: 10.5151/meceng-wccm2012-20176

Referências bibliográficas

• [1] American Institute of Steel Construction. AISC – LRFD – “Manual of steel construction”. Chicago, 1999.
• [2] Associação Brasileira de Normas Técnicas, NBR 8800 – “Projeto e execução de estruturas de aço de edifícios: método dos estados limites”. Rio de Janeiro, 1986.
• [3] European Commitee For Standardization. Eurocode 3. Design of steel structures. Part.1.1. General rules and rules for buildings 1992.
• [4] Freitas, C. A. S., Estudos experimental, numérico e analítico de conexões de estruturas espaciais em aço com correção e reforço na ligação típica estampada. Tese de doutorado, Departamento de Engenharia Civil e Ambiental, Universidade de Brasília, Brasília, 2008.
• [5] Freitas, C.A.S.; Bezerra, L.M.; Nagato, Y., Increasing load capacity of steel space trusses with staking end-flattened connections. Journal of constructional steel research – Elservier, 2008.
• [6] Souza, A. S. C., Analise teórica e experimental de treliças espaciais – Tese de Doutorado, Escola de Engenharia de São Carlos, EESC/USP, São Paulo, 2003.

Como citar:

Freitas, C. A. S. de; Cavalcante, O.R.O.; Araujo, R. M.; Sousa, G. M. Araújo e E. C.; "NUMERICAL INVESTIGATION OF THE SPACE-TRUSS WITH REINFORCE OF THE STAMPED CONNECTION AFTER CALIBRATION MODEL IN EXPERIMENTAL STUDY", p-4950-4966. In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1]. São Paulo: Blucher, 2014.
ISSN 23580828, DOI 10.5151/meceng-wccm2012-20176