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The application of high strength material is used to limit the width of the column under the floor of a high-rise building. High strength concrete column specimens with dimensions of 600x600x1800 mm will be modeled using the ABAQUS program with constant axial load and lateral displacement. High strength concrete specifications 70 MPa, high strength longitudinal reinforcing bar (SD685) and high strength transverse reinforcing bar (SD785) were used in this study. The constant axial load input used is 0.1Agf'c with the lateral displacement load until it fails. The purpose of this study was to determine the behavior of force-displacement relationship of high strength reinforced concrete columns that occurred due to the monotonic lateral displacement load and low axial load. Modelling of concrete elements using solid CD38R and reinforcig bar using T2D3 truss elements with mesh 100x100 mm. High strength concrete column modeling results show that the prediction of FEA high quality concrete columns has a good correlation with the experimental results for column stiffness.Kata kunci: Kolom mutu tinggi, beban aksial, pemodelan, elemen hingga Abstrak Penerapan material mutu tinggi mulai digunakan untuk membatasi luas kolom dilantai bawah struktur gedung tinggi. Spesimen kolom beton mutu tinggi dengan dimensi 600x600x1800 mm akan dimodelkan menggunakan program bantu ABAQUS dengan beban aksial secara konstan dan lateral displacement. Spesifikasi beton mutu tinggi 70 MPa, tulangan longitudinal mutu tinggi (SD685) dan tulangan transversal mutu tinggi (SD785) digunakan pada penelitian ini. Input beban aksial konstan yang digunakan adalah 0,1Agf'cdengan beban lateral displacement sampai gagal. Tujuan penelitian ini adalah untuk mengetahui perilaku hubungan force terhadap displacement kolom beton bertulang mutu tinggi yang terjadi akibat beban perpindahanlateral monotonik dan beban aksial rendah. Pemodelan elemen beton menggunakan solid CD38R dan tulangan menggunakan elemen truss T2D3 dengan mesh 100x100 mm. Hasil pemodelan kolom beton mutu tinggi menunjukkan bahwa prediksi FEA kolom beton mutu tinggi mempunyai korelasi yang baik dengan hasil eksperimen untuk kekakuan kolom.

This paper investigates the possibility of using a multi-surface plasticity model to predict shear failure in reinforced concrete beams. The analysis is carried out using the in-house software called 3D-NLFEA. The constitutive model for the concrete material is based on the plasticity-fracture model, which had previously developed to simulate the behavior of concrete cover spalling in reinforced concrete columns.To obtain the asymmetric shear failure pattern, random material properties imperfection for each meshed element is used. Two beams available in the literature are investigated and compared with the analysis results using 3D-NLFEA. From the comparisons, excellent agreement between the analysis and the test result was obtained. 3D-NLFEA can predict the peak load accurately. The peak load prediction only varies 2.19% for beam OA1 and 3.28 % for beam OA2, and it was lower than the test results. The failure crack patterns also show a typical diagonal crack extension from the support to the loading steel plate.

This study presents the ductility evaluation of reinforced concrete column made of normal-strength material using various empirical stress-strain model with nonlinear sectional fiber based analysis. The purpose is to evaluate the confinement requirement for reinforced concrete column under high axial load level. The concrete strength considered in the analysis are varies from 30 to 70 MPa while the steel reinforcing bar yield strength considered is only 400 MPa. The ductility is evaluated by using the customized ductility index measurement. The ratio of the concrete cover to the concrete core is set to 0.1 but not more than 40 mm. Attard and Setunge's concrete constitutive model is used in this investigation. Cover spalling behavior is considered in the analysis by including the restrained shrinkage effect on the concrete strength and the softening behavior. From this study, it was found that extra confinement is necessary to maintain the expected minimum level of ductility.