Master Thesis Abstract

Parametric Study on Displacement-Based Design Method Procedures for RC Structures

Master Thesis Abstract

Yoppy Soleman. Parametric Study on Displacement-Based Design Method Procedures for Reinforced Concrete Structures (Supervised by Prof. Ir. Richard Toreh, M.Sc, PhD., and Prof. Dr. Ir. Jonie Tanijaya, M.Sc.). This thesis is based on the facts reported by some researchers in USA, Japan and New Zealand that the conceptual incompatibilty in Force/Strength-Based Method have produced analytical inconsistency in practice of earthquake resistant design and have implicated on lateral deformation excess. It is the displacement-based method, the new conceptual design that determines the structural performance based on deformation or displacement. The literature study covers four displacement based methods, i.e. DDBD (=Direct Displacement-Based Design), PM (=Proportioning Method for RC Structures), IDS (=Inelastic Design Spectra), CSM (=Capacity Spectrum Method), and two case implementations, as follows: (a) an eigth-storey symmetrical concrete ductile moment resistant frame, and (b) an eight-storey vertically unsymmetrical concrete ductile moment resistant frame. The analysis is focused on three aspects of displacement-based methods: 1. The base parameter problems (etiology) 2. The significance of the specific assumption or base parameter used from each procedures in relation to analysis and design results. 3. The verification of parameter consistency (especially for DDBD method) The study determines design spectra response on the maximum quake with an intensity of tremors which equals 0.40g PBA (peak base accelleration) constructed based on Newmark-Hall (1982) procedure and SeismoSignal application (2004). The variability of analysis and design results of all methods investigated is influenced by various level of structural analyst’s assumptions or interpretations, but especially predominant in two methods, i.e. IDS (A.K. Chopra) and CSM (S.A. Freeman).

Of the four methods studied, three procedures (DDBD – JMN Priestley, IDS – A.K. Chopra, CSM – S.A. Freeman) need the calculation of yield moment curvatures as the most important micro-design parameters and two procedures (IDS – A.K. Chopra, CSM – S.A. Freeman) requires the calculation of element detailing (reinforcement area) in early process, while the other two (DDBD – JMN Priestley, PM – J.P. Browning) the calculation of reinforcement area is given as design solution.

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© Yoppy Soleman, 2006


Sinopsis

Yoppy Soleman. Kajian Parameter dalam Beberapa Prosedur Desain Metoda Perpindahan pada Struktur Beton Bertulang (dibimbing oleh Richard Toreh dan Jonie Tanijaya). Thesis ini bertitik-tolak dari fakta-fakta yang dilaporkan oleh beberapa peneliti di USA dan Selandia Baru bahwa inkompatibilitas konseptual dalam metoda berbasis gaya/kekuatan (Force/Strength-Based Design) telah menghasilkan inkonsistensi analisis dalam praktek desain tahan gempa dan berimplikasi pada ekses deformasi lateral. Adalah metoda berbasis perpindahan (Displacement-Based Method), suatu konseptual desain baru, yang menentukan performa struktur berdasar parameter displasemen atau deformasi. Kajian literatur meliputi empat prosedur berbasis perpindahan, yakni: Desain Berdasar-Perpindahan Langsung atau DDBD (=Direct Displacement-Based Design), Metoda Pemroporsian Struktur Beton Bertulang atau PM (=Proportioning Method for RC Structures), Metoda Spektra Desain Inelastik atau IDS (=Inelastic Design Spectra), Metoda Spektra Kapasitas atau CSM (=Capacity Spectrum Method), dan dua implementasi kasus, sbb: (1) Struktur portal beton bertulang tahan momen simetrik berlantai 8, (2) Struktur portal beton bertulang non-simetrik vertikal berlantai 8. Analisis difokuskan pada tiga aspek dari metoda berbasis perpindahan: 1. Problem parameter dasar (etiologi) 2. Signifikansi penggunaan asumsi atau parameter dasar tertentu masing-masing prosedur terhadap hasil-hasil analisis dan desain 3. Verifikasi konsistensi parameter (khusus metoda DDBD).

Kajian ini menentukan tanggap spektra desain gempa maksimum dari intensitas gempa dengan PBA (Peak Base Accelleration) = 0.40g yang dikonstruksi berdasarkan prosedur Newmark-Hall (1982) dan aplikasi Seismosignal (2004). Variabilitas hasil analisis dan desain dalam semua metoda yang diteliti dipengaruhi oleh asumsi dan interpretasi analis struktur pada taraf yang berbeda-beda, tetapi terutama dominan dalam dua metoda, yaitu IDS (A.K. Chopra) dan CSM (S.A. Freeman). Dari keempat prosedur yang diteliti, tiga prosedur (DDBD – JMN Priestley, IDS – A.K. Chopra, CSM – S.A. Freeman) memerlukan perhitungan kurvatur momen luluh sebagai parameter mikro desain yang terpenting. Dari keempat prosedur yang diteliti, dua prosedur (IDS – A.K. Chopra, CSM – S.A. Freeman) mensyaratkan perhitungan pendetailan elemen pada awal proses, sementara dalam dua prosedur lainnya (DDBD – JMN Priestley, PM – J.P. Browning) perhitungan luas tulangan elemen struktural diberikan sebagai solusi desain.

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Master Thesis Abstract

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