Stiffness reduction factors for geometric and material nonlinearity of reinforced concrete beams and columns subject to short term loading

• Type: Article in International Conference Proceedings Book
• Date: 2009

Authors

Sousa, AC (Author) Other; Pereira, M (Author) Other; Rui Carneiro de Barros (Author) FEUP

Conference proceedings International

Title: Proceedings of the Twelfth International Conference on Civil Structural and Environmental Engineering Computing

TWELFTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING

Funchal, Madeira, Portugal, 1-4 September 2009

Indexing

Scopus - 0 Citations

Other information

Authenticus ID: P-008-JAW

Abstract (EN): The assessment of second-order effects according to Eurocode 2 can be done according to three methods: the general method; method based in nominal stiffness; method based in nominal curvature. The first is based on a nonlinear analysis taking into account both geometric and material nonlinearities in which the effects of material plasticity, cracking, creep and shrinkage are taken into consideration through adequate constitutive laws. In the nominal stiffness method, second-order effects are estimated through a set of expressions that amplify the first order moments according to the relation between the axial load and the critical buckling load. The assessment of the buckling load is made taking into consideration the combined effect of geometric and material nonlinearity on the structural element by means of an effective flexural stiffness. This paper compares the expressions presented in Eurocode 2 with numerical trials conducted on a series of columns over a range of eccentricities of both equal, equal and opposite, and opposite and one half of each other; it also presents a series of numerical trials that aim to evaluate the appropriate stiffness reduction in ultimate limit state of beams. To this end, several types of sections, end restraints, and mechanical reinforcement ratios are modeled. © Civil-Comp Press, 2009.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 23