NonLinear Analysis of Reinforced Concrete Shells Using Assumed Strain Elements  

Oleh:

Abdul-Razzak, A.A. ; Abdullah, S.M.

Jenis: Article from Journal - ilmiah nasional - tidak terakreditasi DIKTI
Dalam koleksi: SIGMA: Jurnal Sains dan teknologi vol. 6 no. 2 (Jul. 2003), page 123-133.
Topik: Assumed strain elements; compression; cracking; nonlinear analysis; reinforced concrete shells; stress-strain relationship

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: SS25.4 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

This paper describes the application of finite element method to investigate the behaviour of reinforced concrete shells in the pre-and post-crecking levels up to the ultimate load. Nine-node Lagrangian degenerate elements, which are the general shear in the orthogonal curvilinear coordinate system is used in the formulation to avoid shear and membrane-locking behaviour. A layered approach is adopted to discretize the concrete through the thickness. Both an elastic perfectly plastic and strain hardening plasticity approach have been employed to model the compressive behaviour of the concrete. The yield condition is formulated in terms of the first two stress invariants. The motion of the subsequent loading surfaces is controlled by the hardening rule, which is ex trapolated from the uniaxial stress-strain relationship given by a parabolic function. Concrete crushing is a strain-contolled phenomenon, which is monitored by a fracture surface similar to the yield surface. A smeared fixed crack approach is used to model the behaviour of the cracked concrete, coupled with a tensile strength criterion to predict crack initiation. Tension stiffening effect in the cracked concrete has been taken into account. An attention is given also to the post-cracking shear strength. The steel is considered either as an elastic perfectly plastic material or as an elastic-plastic material with linear strain hardening. Steel reinforcement is assumed to have similar response to tensile or compressive force.

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