Studi Komparasi Sistem Isolasi Dasar High-Damping Rubber Bearing dan Friction Pendulum System pada Bangunan Beton Bertulang

Bambang Budiono, Andri Setiawan

Abstract


Abstrak. Perkembangan dari perencanaan bangunan tahan gempa pada beberapa dekade terakhir telah melahirkan suatu inovasi baru yang disebut sistem isolasi dasar. Dua jenis sistem isolasi dasar yang telah banyak digunakan adalah High-Damping Rubber Bearing (HDRB) dan Friction Pendulum System (FPS). Tujuan dari studi ini adalah membandingkan kinerja HDRB dan FPS pada kondisi perpindahan rencana dan riwayat pembebanan gempa yang sama serta mempelajari pengaruh kekangan khusus maupun menengah pada bangunan yang sudah dilengkapi dengan sistem isolasi dasar. Digunakan lima model studi berupa gedung perkantoran hipotetikal dua puluh lima lantai dengan sistem struktur berupa sistem ganda yang terletak di daerah Jakarta dengan kondisi tanah sedang. Digunakan analisis non-linear riwayat waktu (NLTHA) dengan memanfaatkan tujuh buah riwayat gempa yang telah diskalakan terhadap respon spektra target baik pada Design Basis Earthquake (DBE) maupun Maximum Credible Earthquake Risk Category (MCER). Parameter-parameter yang dibandingkan meliputi perpindahan atap, gaya geser dasar, perpindahan antar lantai, kondisi kerusakan sendi plastis, rasio redaman efektif, dan kemampuan
disipasi energi inelastik dari kedua perangkat tersebut. Berdasarkan parameter-parameter tersebut, perangkat FPS terbukti dapat bekerja lebih baik dibandingkan dengan HDRB dalam mereduksi gaya gempa. Selain itu, efek kekangan terbukti tidak lagi memberikan pengaruh yang signifikan pada gedung yang sudah dilengkapi dengan sistem isolasi dasar.

Abstract. Development of earthquake resistant building design in recent decades has produced a new invention called base isolation system. Two types of base isolation system that has been widely used are high-damping rubber bearing (HDRB) and friction pendulum system (FPS). The purpose of this study is to compare the performance of both base isolation devices on same design displacement and earthquake load and to learn the effect of both special and intermediate detailing on the buildings which have been equipped with the base isolation devices. Five hypothetical office building model, 25-story tall, with dual system structure which is located in Jakarta with medium soil condition will be introduced. Nonlinear time history analysis (NLTHA) with seven ground motion which have been scaled both to Design Basis Earthquake (DBE) and Maximum Credible Earthquake Risk Category (MCER) target spectra will be used. The measured parameters included roof drift, base shear, inter-story drift, plastic hinges damage, effective damping ratio, and energy dissipation capacity for both devices. Based on these parameters, it has been proved that FPS works more effectively when compared to HDRB in reducing seismic damage. Besides, effect of confinement is no longer significant for buildings which have been equipped with base isolation devices.

Keywords


Sistem isolasi dasar; High-Damping rubber bearing; Friction pendulum system; Mekanisme; Disipasi energi; Design basis earthquake (DBE); Maximum credible earthquake risk Category (MCER); Analisis non-linear riwayat waktu

Full Text:

PDF

References


Bridgestone Corporation, 2013, Seismic Isolator for Buildings : Multi Rubber Bearing. Tokyo, Japan: Bridgestone Corporation.

CSI Perform-3D, 2012, Nonlinear Analysis and Performance Assessment for 3D Structures V.5.0.0. California, USA: Computer and Science, Inc., S/N: C1FBFBY21526JER License owned by Prof. Bambang Budiono of ITB.

EZ Frisk 7.62, 2013, License owned by Ir. I Wayan Sengara, MSCE, Ph.D of ITB.

FEMA P-751 Chapter 12, 2012, Seismically Isolated Structures. Washington, D.C., USA: Federal Emergency Management Agency.

FEMA 356, 2000, Prestandard and Commentary for Seismic Rehabilitation of Buildings. Washington, D.C., USA: Federal Emergency Management Agency.

Jose, L.A., Juan, C., De La Llera, dan Jose, A.I., 1998, Modelling Aspects of Structures Isolated With The Frictional Pendulum System. USA: John Wiley & Sons, Ltd.

Kelly, T., 2001, Base Isolation of Structures: Design Guidelines. Wellington, New Zealand: Holmes Consulting Group.

PEER Berkeley, 2000, Strong Motion Database. California, USA: University of California.

Powell, Graham, 2012, Performance Based Design Using Nonlinear Analysis. California, USA: Computer & Structures, Inc. Educational Services.

SNI 2847:2013, 2013, Persyaratan Beton Struktural untuk Bangunan Gedung. Jakarta, Indonesia: Badan Standardisasi Nasional.

SNI 1726:2012, 2013, Tata Cara Perencanaan Ketahanan Gempa untuk Struktur Bangunan Gedung dan Non Gedung. Jakarta, Indonesia: Badan Standardisasi Nasional.

SNI 1727-1989, 1989, Tata Cara Perencanaan Pembebanan untuk Rumah dan Gedung. Jakarta, Indonesia: Badan Standardisasi Nasional.

Villaverde, R., 2009, Fundamental Concepts of Earthquake Engineering. Boca Raton: CRC Press.




DOI: http://dx.doi.org/10.5614%2Fjts.2014.21.3.1

Refbacks

  • There are currently no refbacks.


web
analytics

Lisensi Creative Commons

This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License