<p>Flat slab adalah pelat beton bertulang yang didukung oleh kolom ditambah drop panel atau mungkin kolom ditambah kepala kolom atau tanpa kepala kolom dan drop panel. Metode desain dan analisis flat slab yang akan digunakan adalah metode desain langsung dimana metode tersebut adalah menentukan tebal minimum pelat yang tinjau berdasarkan mutu baja yang akan digunakan pada analisis ini. Distribusi momen pada analisis dengan metode desain langsung menghasilkan momen total yang kemudian akan didistribusi ke masing-masing panel untuk lajur kolom dan lajur tengah. Kegagalan geser (punching shear) terjadi pada area penampang kritis di sekitar kepala kolom dan drop panel sehingga kekuatan geser akan dihitung berdasarkan nilai kekuatan geser yang terjadi dan akan di kontrol dengan kekuatan geser dari mutu beton yang digunakan. Dalam tulisan ini desain dan analisis akan dilakukan secara numerik berdasarkan SNI 2847:2019 dengan menggunakan software Matlab. Selanjutnya hasil analisis yang telah diperoleh dari software Matlab menunjukan bahwa panel internal yang didesain aman dari kegagalan punching shear.</p>
Shear walls are structural walls designated as part of an earthquake force-resisting system, which also serves to increase the stiffness of the structure and absorb large shear forces as the height of the structure increases. When shear walls are placed in the right and strategic position, shear walls can be used economically to provide horizontal load resistance. In this paper, the 7-storey symmetrical building structure is modelled and analyzed using ETABS v.9.7.4 software. Analysis was carried out on four structural models with variations in the proposed shear wall locations. The model without shear walls was used as a controller for the normal model. This paper aims to optimize the location of the shear wall in a 7-storey symmetrical building structure. Furthermore, the results of the analysis of the structure of the building without shear walls and variations in the location of the shear walls were obtained using the ETABS v.9.7.4 software. The analysis results show that model 3 is a better location for shear walls to be applied to the review structure. Abstrak Shear wall merupakan dinding struktur yang ditetapkan sebagai bagian dari sistem penahan gaya gempa, juga berfungsi menambah kekakuan struktur dan menyerap gaya geser yang besar seiring dengan semakin tingginya struktur. Ketika shear wall diletakan pada posisi yang cocok dan strategis, shear wall dapat digunakan secara ekonomis untuk menyediakan tahanan beban horisontal yang diperlukan. Dalam tulisan ini struktur gedung simetris 7 tingkat dimodelkan dan dianalisis menggunakan software ETABS v.9.7.4. Analisis dilakukan pada 4 model struktur dengan variasi letak shear wall yang diusulkan. Untuk model normal yaitu model tanpa shear wall digunakan sebagai pengontrol. Tulisan ini bertujuan untuk mengoptimalkan letak shear wall pada struktur gedung simetris 7 tingkat. Selanjutnya, hasil analisis struktur gedung tanpa shear wall dan dengan variasi letak shear wall menggunakan software ETABS v.9.7.4 telah diperoleh. Hasil analisis menunjukan bahwa model 3 merupakan letak shear wall yang lebih baik untuk diterapkan pada struktur tinjauan.
Struktur balok merupakan tipe elemen struktural yang penting untuk para profesional konstruksi serta mayoritas insinyur wajib akrab dengan balok. Tipe struktur balok yang dibahas dalam tulisan ini merupakan struktur balok sederhana (simple beam). Dalam menghitung gaya-gaya serta deformasi struktur secara numerik memerlukan waktu yang lebih lama serta memerlukan ketelitian yang baik. Pada masa yang semakin canggih ini, telah tersedia bermacam software serta aplikasi yang dapat digunakan untuk mendapatkan gaya-gaya dalam serta deformasi struktur dengan cepat dan akurat. Salah satu software yakni SAP2000 dan salah satu aplikasi yakni Easy Beam dapat digunakan untuk mendapatkan gaya-gaya dalam serta deformasi struktur dengan cepat dan akurat. Dalam tulisan ini struktur balok sederhana dimodelkan serta dianalisis menggunakan software SAP2000 dan aplikasi Easy Beam. Tulisan ini bertujuan untuk membandingkan hasil analisis dengan software SAP2000 dan aplikasi Easy Beam khususnya balok sederhana. Selanjutnya, hasil analisis dengan software SAP2000 dan aplikasi Easy Beam telah diperoleh serta telah bahas. Hasil analisis menunjukan bahwa nilai-nilai yang diperoleh tidak memiliki perbedaan yang signifikan. Kata kunci— simple beam, Easy Beam analysis, SAP2000
Various structural factors that contribute to damage during an earthquake are vertical irregularities, irregularities in strength and stiffness, mass irregularities, torsional irregularities, and so on. Over the past decade, performance-based design (PBD) procedures have become one of the most critical areas in earthquake engineering. The pushover procedure is divided into two parts; the first is the displacement target for the erected building. The target is the estimated displacement of the top of the building when exposed to the design earthquake excitation. Then a pushover analysis is carried out on the building until the top removal is equal to the target displacement. Second is the type of controlled force in which the total amount of force acting is estimated and applied to the structure, and analysis is carried out. The various performance levels for a building are expressed in terms of the base shear carried versus the roof displacement. If all the plastic hinges formed are within the CP limit, the structure is said to be safe. On the other hand, if the plastic hinge formed exceeds the CP limit, the structure is said to have collapsed. This paper proposes a 2D reinforced concrete frame with three models with variations of vertical irregularity. This paper aims to see the nonlinear behavior of reinforced concrete frames with vertical irregularities through the pushover method using SAP2000 software. Furthermore, the analysis results show that the skeleton is susceptible to increasing vertical irregularity. As the vertical irregularity increases, the percentage of the plastic hinge crossing the boundary increases. The analysis results also show that model 2 has better behavior.
Structural systems that do not use a beam as the main component were first developed by Turner in 1906. This structural system is better known as a flat slab. The flat slab structure is supported by column heads and drop panels, or without drop panels, or without column heads. Several building codes such as IS 456: 2000, ACI 318-08, ACI 318-19, EC 2:2004, and NZS 3101 (Part 1):2006 provide guidance for designing flat slab systems under gravity loads only. However, many flat slab buildings are also built in areas with high earthquakes which can cause the collapse of buildings due to earthquake loads. In this paper the 10-level flat slab building structure design results are analyzed using nonlinear time history response analysis with the help of OpenSees Navigator software using several earthquake records, namely Kobe (Japan, 1995), Imperial Valley (California, 1979) and Tabas (Iran, 1978) which has been adjusted to the design spectra of the city of Yogyakarta. From the results of the analysis using OpenSees Navigator, it was found that the story drift that occurred was still within the limits required in the regulations, so that the building being reviewed was still within the limits of life safety design.
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