This paper presents nonlinear finite element analysis of eccentrically loaded circular Reinforced Concrete (RC) column confined with Carbon Fiber Reinforced Polymer (CFRP) wraps. The concrete constitutive model uses a plasticityfracture model which is restraint sensitive, utilize a non-constant plastic dilation rate, and is able to simulate the plastic volumetric compaction of concrete core under high confining pressure. For validation of the models, two available specimens from the literature are used in the validations. Excellent agreement between the numerical models and the available test results are obtained in this study. A detailed investigation on the confinement effectiveness of both external and internal confining devices are presented and discussed. This discussion of the confinement effectiveness is important to be included in the design formula.
This paper presents nonlinear finite element analysis of eccentrically loaded circular Reinforced Concrete (RC) column confined with Carbon Fiber Reinforced Polymer (CFRP). The purpose of this study is to validate the proposed plasticity-fracture model of Piscesa et. al. (2019) to model RC column confined with CFRP under eccentric loading. The software used in the simulation is and inhouse finite element package called 3D-NFLEA. Two available specimens in the literature are investigated and an existing numerical result is also included for comparison purposes. From the analysis and investigation, it was found out that the negative effect of confinement at the outer concrete region was caused by significant difference between the concrete dilation rate at the inner to the outer concrete core region. In addition, From the comparison, close agreement between the numerical models and the available test result are discovered in this study. As for the column ductility, it was found out that the column ductility was higher for column with larger initial load eccentricity.
Perkembangan pesat dan industrialisasi besar di kota metropolitan menyebabkan naiknya angka urbanisasi ke kota tersebut. Dengan minimnya lahan diperkotaan, perlu dikembangkan bangunan vertikal. Pengembangan ini rentan terhadap beban lateral seperti angin dan gempa. Dengan demikian, para insinyur harus solutif dalam memilih sistem mana yang digunakan untuk merancang bangunan. Pemilihan sistem harus mempertimbangkan aspek kekuatan dan efisiensi sistem struktur karena bangunan yang kuat menahan gaya gempa memerlukan biaya konstruksi yang sangat mahal. Apartemen Puncak Dharma Husada berkapasitas 40 lantai menggunakan kombinasi shearwall dan outrigger system. Outrigger merupakan elemen struktur terdiri dari balok setinggi satu lantai yang berfungsi untuk meningkatkan kekakuan keseluruhan bangunan sehingga dapat mereduksi dimensi balok dan kolom. Meningkatnya kekakuan juga dapat mengurangi periode dan simpangan bangunan. Pada tugas akhir ini, elemen outrigger dan belt truss, dimana outrigger dirancang sebagai balok tinggi beton bertulang dan belt truss yang dirancang sebagai struktur rangka yang terbuat dari baja.
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