Hasil Pencarian  ::  Simpan CSV :: Kembali

Abstrak :
Indonesia sebagai negara dengan risiko gempa bumi yang besar memiliki permasalahan yang tinggi pada kerusakan bangunan gedung akibat gempa. Hal tersebut perlu diselesaikan dengan menggunakan teknologi tahan gempa, dimana secara umum teknologi tahan gempa yang digunakan adalah shearwall namun dibeberapa bangunan gedung dapat menggunakan peredam. Pada penelitian ini akan menganalisis penggunaan teknologi peredam gempa berjenis viscoelastic rubber damper yang diaplikasikan pada bangunan gedung SGLC FT UGM berbasis risiko pada pelaksanaan teknologi tersebut untuk meningkatkan kinerja biaya. Penelitian bermula dengan mengidentifikasi komparasi antara teknologi tahan gempa shearwall dan viscoelastic rubber damper dari berbagai aspek, menganalisis aktivitas yang memiliki tujuan dan sasaran pada pekerjaan viscoelastic rubber damper, serta risiko-risiko pada pekerjaan tersebut. Metode yang digunakan pada penelitian ini adalah studi literatur, arsip, validasi pakar, dan pengolahan statistik. Analisis data yang digunakan pada penelitian ini adalah analisis deskriptif dan pengujian statistik untuk mendapatkan risiko dominan pada pekerjaan viscoelastic rubber damper pada bangunan gedung. ......Indonesia as a country with a large earthquake risk has a high problem of damage to buildings due to earthquakes. This needs to be solved by using earthquake-resistant technology, where in general the earthquake-resistant technology used is shearwall, but some buildings can use dampers. This study will analyze the use of earthquake damper technology of the viscoelastic rubber damper type which is applied to the SGLC FT UGM building which has risks in the implementation of this technology to improve cost performance. The research begins by identifying the comparison between earthquake resistant shearwall technology and viscoelastic rubber damper from various aspects, analyzing activities that have goals and objectives in viscoelastic rubber damper work, as well as the risks involved in the work. The methods used in this research are literature studies, archives, expert validation, and statistical processing. Data analysis used in this study is descriptive analysis and risk statistical testing to get the dominant effect on the work of viscoelastic rubber dampers in buildings.

Abstrak :
The flow behavior of fluids such as molten plastics, biological fluids, and paints is much more varied and complex than that of traditional Newtonian fluids. The role of numerical simulation in the study of such flows has increased tremendously over the past fifteen years, and the phenomena and numerical difficulties in complex flows have led to new and challenging mathematical questions. Studying such flows presents a host of problems, as well as opportunities for mathematical analysis, including questions of asymptotics, qualitative dynamics, and adequacy of numerical methods. Mathematical Analysis of Viscoelastic Flows presents an overview of mathematical problems, methods, and results relating to research on viscoelastic flows. This monograph is based on a series of lectures presented at the 1999 NSF-CBMS Regional Research Conference on Mathematical Analysis of Viscoelastic Flows. It begins with an introduction to phenomena observed in viscoelastic flows, the formulation of mathematical equations to model such flows, and the behavior of various models in simple flows. It also discusses the asymptotics of the high Weissenberg limit, the analysis of flow instabilities, the equations of viscoelastic flows, jets and filaments and their breakup, as well as several other topics.

Abstrak :
Dalam beberapa tahun terakhir, perangkat peredam telah dipelajari secara eksperimental untuk menggantikan balok kopel dengan tulangan diagonal, untuk mengurangi masalah kepadatan tulangan. Studi ini berfokus pada evaluasi efektivitas alat peredam Viscoelastic Damper (VD) dan Rotational Friction Damper (RFD), dengan studi kasus gedung kantor beton bertulang 15 lantai dengan sistem ganda (kolom-balok dan dinding geser). Analisis yang digunakan adalah analisis riwayat waktu nonlinier dengan 11 pasang gerakan tanah yang dicocokkan dengan spektrum respon Indonesia berdasarkan ASCE 41-17 dan ASCE 7-16. Pada analisa ini masing-masing peredam akan divariasikan dengan posisi yang berbeda dan variasi kapasitas properties dari damper. Hasil penelitian menunjukkan bahwa untuk model RFD peningkatan jumlah posisi damper, peningkatan kapasitas gaya damper, dan kapasitas displacement yang terpasang akan menurunkan performa elemen struktur utama, khususnya pada balok induk. Sedangkan pada model VD peningkatan jumlah posisi damper dan jumlah layer pada damper juga akan mengurangi performa dari balok induk, berbeda dengan model RFD, pada model VD terdapat peningkatan performa pada elemen dinding geser dan kolom walaupun masih didalam batasan yang diberikan. Penurunan performa tidak hanya terjadi pada performa lokal (elemen) saja, tetapi performa global (simpangan antar lantai) di beberapa lantai dan gaya geser tingkat khususnya pada model RFD. Penurunan global maupun lokal tersebut dapat mengurangi tingkat kerusakan struktur apabila gempa besar datang. Dari hasil analisis balok kopel yang menggunakan RFD lebih efektif dibandingkan dengan menggunakan VD dalam meningkatkan kinerja bangunan. ......In recent years, the damping device has been experimentally studied to replace the coupling beam with diagonal reinforcement, in order to reduce the problem of reinforcement congested. This study focuses on evaluating the effectiveness of the Viscoelastic Damper (VD) and Rotational Friction Damper (RFD), with a case study of a 15-story reinforced concrete office building with a double system (column-beam and shear wall). The analysis used is a nonlinear time history analysis with 11 pairs of ground motions matched to the Indonesian response spectrum based on ASCE 41-17 and ASCE 7-16. In this analysis, each damper will be varied with different positions and variations in the capacity properties of the damper. The results show that for the RFD model, increasing the number of damper positions and increasing the capacity of the installed damper force and displacement will reduce the performance of the main structural elements, especially on the main beam. Whereas in the VD model, increasing the number of damper positions and the number of layers on the damper will also reduce the performance of the main beam, in contrast to the RFD model, in the VD model there is an increase in the performance of the shear wall and column elements even though it is still within the given limits. Performance degradation did not only occur in local performance (elements), but global performance (story drift) in some floors and story shear especially in RFD models. The global and local decrease can reduce the level of structural damage in the event of a major earthquake. From the results of the analysis of coupling beams using RFD is more effective than using VD in improving building performance.

Abstrak :
This book presents a theoretical approach that allows the analysis of structures with magnetorheological and electrorheological layers, and shows, with the help of examples, how the mechanical behaviour of thin-walled laminated structures can be influenced. It consists of six chapters: Chapter 1 presents a brief overview of derivation approaches for theories of thin-walled structures, modelling of composites and modelling of laminated and sandwich structures. Chapter 2 describes the equivalent single layer model for thin laminated cylindrical shells, including the special cases of plates and beams. In addition to the classical mechanical properties, it also considers the electrorheological and magnetorheological properties. Chapter 3 presents the elastic buckling of laminated beams, plates, and cylindrical shells, discussing various problems, such as the influence of the boundary conditions, external loading and magnetic fields. It also suggests different approximations for asymptotic methods. Chapter 4 focuses on the free vibrations of elastic laminated beams, plates and cylindrical shells, investigating the influence of the boundary conditions and other factors. Chapter 5 presents the latest results concerning vibration of laminated structures composed of smart materials and discusses in detail the influence of electric and magnetic fields on smart structures. These results provide insights into the optimal design of these structures. Lastly, Chapter 6 features a short appendix presenting asymptotic estimates and series.