The aim of this study is to analyze the effects of opening dimension in shear wall on the behavior of high-rise building structure due to earthquake load. The 20-story building prototype with shear wall placement as core wall with various sizes of opening are analyzed with the help of software MIDAS GEN, using equivalent lateral force and response spectrum method in X and Y direction. The shape of opening is square with width vary from 0.8 m – 1.3 m and height set at 2.2 m. This analysis will discuss structure’s natural time period, core wall distribution between shear wall and frame, lateral deflection, and story drift. The results show that the greater the opening will increase the natural time period by 1.72% and 1.67%, increase lateral deflection by 21.7932% and 23.5964%, and increase story drift by 24.6910% and 29.077% in each direction.
The aims from this study is to determine which story has the greatest effect on the structure by using a structural column from composite material that is consist of steel and concrete combined together. Using the help of MIDAS GEN software to do the structural analysis. 5 models were made to capture the lateral displacement due to earthquake loading using linear dynamic procedure. Model 1 is a steel only structure followed by next model using composite materials starting from the bottom 2 floors (model 2 ), 4 floors (model 3), 6 floor (model 4), all floors (model 5). From all of the models that is used, we can conclude that the bottom 2 story is the one that has greatest impact in lowering the lateral displacement.
In the world of construction the use of mild steel is increasing due to the relatively light material and has great strength. This makes the producers start to innovate with the addition of reinforcement to get greater strength. Mild steel is formed from the grinding process on steel plate sheets. Because its thin thickness makes mild steel susceptible to buckling. The use of mild steel as a structural component requires great strength with the addition reinforcement. This research will discuss the effect of embossment width and dimensions on the compressive strength values of mild steel by the finite element method. This thesis uses MIDAS FEA finite element method program. The channel profile used is 75 mm x 34 mm x 5 mm x 0,65 mm with length 2000 mm. Model used is with and without stiffener and embossment distance variation from 15 - 150 mm. Boundary condition used hinge-roller, loading use axial load. The results of the analysis found that the greater the embossment distance, the greater the compressive strength produced. failure that occurs in a stiffener model that has embossment is lateral buckling
The jetty is the most important facility in the port because it is connected between the sea and the land. The jetty structure consists of the upper structure (beams, plates and pile caps) and the lower structure (piles). The upper structure uses reinforced concrete as the base material and the lower structure can use steel or concrete material. In designing the piles on the jetty, the depth of the fixed point is not at the seabed depth, but below the seabed. It is necessary to conduct research on the depth of the pile fixed point at KNP jetty Southeast Sulawesi. Based on the OCDI 2002 (Overseas Coastal Area Development Institute of Japan) using the virtual fixed point method (1/β), the depth of the fixed point on the KNP jetty is 24 m, meanwhile according to the lateral spring method the KNP jetty has a fixed point depth of 25,6 m. and by adding a lateral spring to the pile in the virtual fixed point method, it can also make the model more efficient with a smaller deflection of 6,43% for deflection due to earthquake in the x direction and 7,25% for deflection due to earthquake in y direction. ABSTRAKDermaga merupakan fasilitas yang paling penting pada pelabuhan karena menghubungkan antara laut dan daratan. Struktur dermaga terdiri dari struktur atas (balok, pelat dan pile cap) dan struktur bawah (tiang pancang). Struktur atas menggunakan bahan dasar beton bertulang dan struktur bawah dapat menggunakan bahan baja atau beton. Dalam mendesain tiang pancang pada dermaga, kedalaman titik jepit tidak berada pada kedalaman seabed tetapi berada dibawah seabed. Perlu dilakukan penelitian tentang kedalaman titik jepit tiang pancang. Studi kasus yang dibahas pada penelitian ini adalah dermaga yang berlokasi di Kendari, Sulawesi Tenggara. Dermaga tersebut dikenal dengan nama dermaga “KNP”. Berdasarkan OCDI (Overseas Coastal Area Development Institute of Japan) tahun 2002 dengan menggunakan metode virtual fixed point (1/β) memiliki kedalaman titik jepit pada dermaga “KNP” sebesar 24 m, sedangkan menurut metode pegas lateral pada dermaga “KNP” memiliki kedalaman titik jepit sebesar 25,6 m dan dengan menambahkan pegas lateral pada tiang pancang dalam metode virtual fixed point juga dapat membuat model lebih efisien dengan defleksi yang lebih kecil sebesar 6,43% untuk defleksi akibat gempa arah x dan 7,25% untuk defleksi akibat gempa arah y.
ABSTRAKDengan letak Indonesia yang strategis secara geografis dan geologis, tanah di Indonesia memiliki potensi gempa yang berbeda-beda di setiap wilayahnya. Keadaan tersebut perlu diantisipasi agar dapat mencegah kerusakan fatal ataupun hal-hal yang tidak diinginkan akibat gempa bumi, sehingga perlu diketahui karakteristik tiap lapisan tanah di masing-masing titik pada lokasi tersebut. Salah satunya adalah dengan mengetahui cepat rambat gelombang geser yang didapatkan dari pengujian seismik. Pengujian seismik yang dilakukan pada penelitian ini ada Downhole Seismic, Crosshole Seismic, dan juga modifikasi alat P-S Suspension dengan kedalaman borehole 30 meter dan interval pengujian 1 meter. Demi kelancaran penelitian ini, ketiga pengujian tersebut dibantu dengan alat-alat pengujian dari Olson Instruments dan juga software Wingeo dan Microsoft Excel. Adapun lokasi pengujian yang bertempatkan di Kantor PT. Tarumanegara Bumiyasa. Setelah dilakukan pengolahan data, analisis, dan perbandingan hasil dari ketiga pengujian terhadap hasil berdasarkan data N-SPT dan Sondir dari rumus empiris, didapatkan bahwa pengujian Crosshole Seismic yang paling sesuai dan akurat untuk menentukan hasil cepat rambat gelombang geser. Sedangkan, modifikasi alat P-S Suspension belum dapat digunakan untuk pengujian ini berdasarkan hasil yang ditunjukkan melenceng jauh, khususnya pada kedalaman yang mendekati permukaan. Namun dapat dikembangkan lagi untuk penelitian selanjutnya dengan rancangan yang lebih baik, penambahan uji dengan arah piston yang mengarah ke geofon, dan juga lokasi yang lebih sunyi untuk mengetahui lebih maksimal apakah modifikasi alat P-S Suspension layak untuk digunakan atau tidak. Kata kunci: Downhole Seismic, Crosshole Seismic, P-S Suspension, cepat rambat gelombang geser, pengujian seismik 1. PENDAHULUAN Perbandingan Hasil Eksperimen Downhole Seismic, Crosshole Seismic, dan Modifikasi Alat P-S Suspension dengan Hasil Korelasi Data N-SPT dan CPT Gebby Pandu, et al. Adapun gelombang permukaan (body wave) terdiri dari gelombang Longitudinal dan gelombang Transversal, sedangkan gelombang permukaan terdiri dari gelombang Rayleigh dan gelombang Love.
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