Nonlinear Analysis of Reinforced Concrete Plates  

Oleh:

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

Jenis: Article from Journal - ilmiah nasional - tidak terakreditasi DIKTI
Dalam koleksi: SIGMA: Jurnal Sains dan teknologi vol. 5 no. 1 (Jan. 2002), page 9-18.
Topik: Compression; cracking; nonlinear analysis; reinforced concrete plates; stree-strain relationship; tension stiffening

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: SS25.3 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

In the present work, the finite element method has been used to investigate the behavior of reinforced concrete slabs in the pre- and post-cracking levels up to ultimate load. Nine-node Lagrangian degenerate elements, which are the general shear deformable elements, have been employed. An assumed transverse shear strain is used in the formulation to overcome the shear locking. 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 behavior of the concrete. The yield condition is formulated in terms of the first two stress invariants. The motion of the subsequent loading surface is controlled by the hardening rule, which is extrapolated from the uniaxial stress-strain relationship defined by a parabolic function. Concrete crushing is a strain-controlled phenomenon, which is monitored by a fracture surface similar to the yield surface. A smeared fixed crack approach is used to model the behavior of the cracked concrete, coupled with a tensile strength criterion to predict crack initiation. An attention is given also to the post-cracking shear strength. The steel is considered ered either as an elastic perfectly plastic material or as an elastic plastic material with linear strain hardening. Steel reinforcement is assumed to have similiar tensile and compressive stess-strain relationship. Several copmputer programs coded in FORTRAN language are written to implement the present study. These programs are arranged to give a complete listing of stresses and deformation in every concrete or steel layer. Several examples for which experimental results are published are analyzed, using the proposed model and showed good agreement with the numerical results.

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