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.
Pembahasan mengenai pemodelan numerik dilakukan untuk mengevaluasi perilaku dinding bata beton berlubang akibat beban aksial. Pemodelan bata beton berlubang menggunakan elemen 3 dimensi dengan 8 nodal. Meshing 20 x 20 mm digunakan pada pemodelan. Pada pemodelan ini constraint yang digunakan untuk menghubungkan antar bata beton berlubang adalah tie constraints. Parameter elastik dan inelastik diperoleh dari persamaan tegangan regangan tekan beton. Evaluasi pemodelan numerik ditinjau dari perilaku kegagalan yang terjadi pada bata beton berlubang. Hasil dari pemodelan menunjukan bata beton bertulang mengalami retakan vertikal ditunjukan dengan adanya konsentrasi tegangan vertikal di tengah badan. Kegagalan tekan terjadi pada sambungan mortar antar bata beton berlubang.Kata-kata kunci: Kerusakan Tekan, Dinding Bata Beton
This paper presents the chemical and mechanical properties of Corypha utan leaf fiber (CULF) subjected to different chemical treatments for reinforced composite materials. Natural fibers are currently considered as an alternative constituent for composite reinforcement due to their friendly environment character. The CULF were chemically treated during a pre-fabrication process using NaOH, and 3-(Trimethoxysilyl) propyl methacrylate was introduced at three different concentrations of 0%, 5%, and 10%, respectively. All the chemical treatments on CULF were observed using Fourier Transform Infrared (FTIR) Spectroscopy. Furthermore, vacuum bagging method with unsaturated polyester was used to manufacture CULF as composite reinforcement. Tensile and bending tests were carried out to collect mechanical properties data of the produced CULF reinforced composites. The data obtained could support further study in the area and development of natural fiber-reinforced composite.
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