scholarly journals Force Based Design and Direct Displacement Based Design for Dual System Structure

2019 ◽  
Vol 19 (3) ◽  
pp. 162
Author(s):  
Annisaa Dina Puspita ◽  
Anis Rosyidah
Keyword(s):  
Shear Force ◽  
Damage Control ◽  
Performance Level ◽  
Dual System ◽  
Reinforcement Ratio ◽  
System Structure ◽  
Building Structures ◽  
Base Shear ◽  
Direct Displacement Based Design ◽  
Displacement Based

The Force Based Design (FBD) and the Direct Displacement-Based Design (DDBD) are methods for designing seismic-resistant buildings. Building structures designed, are expected to be suitable with the purpose and usefulness of a building. For this reason, this study compares the performance of dual system structures using the DDBD and FBD methods that aim to prove better performance with consideration of safety against users during an earthquake. This research method uses design analysis method to compare the value of the base shear force, reinforcement ratio, and performance level using software for static nonlinear pushover analysis. The results showed the value of the base shear force x direction of the DDBD method was 17.57% smaller than the FBD method, whereas for the y direction the DDBD value was greater than 9.38% of the FBD. The value of the reinforcement ratio of the beam, column and shear wall results is greater DDBD than FBD. The actual drift of the DDBD and FBD methods is slightly different. So that both are at the same level of performance, namely damage control. The performance level has not reached the performance target of life safety design in DDBD, but the structure has met the level performance requirements for offices.

Direct Displacement-Based Design of a RC wall-steel EBF dual system with added dampers

2009 ◽  
Vol 42 (3) ◽  
pp. 167-178 ◽  
Author(s):  
Timothy J. Sullivan
Keyword(s):  
Linear Time ◽  
Design Method ◽  
Design Procedure ◽  
Time History ◽  
Dual System ◽  
System Structure ◽  
Design Solution ◽  
Equivalent Viscous Damping ◽  
Direct Displacement Based Design ◽  
Displacement Based

An innovative application of Direct Displacement-Based Design (DBD) is presented for a modern 8-storey dual system structure consisting of interior concrete walls in parallel to a number of large steel eccentrically braced frames, fitted with visco-elastic dampers at link positions. The innovative DBD methodology lets the designer directly control the forces in the structure by choosing strength proportions at the start of the design procedure. The strength proportions are used to establish the displaced shape at peak response and thereby establish the equivalent single-degree-of-freedom system design displacement, mass and effective height. A new simplified formulation for the equivalent viscous damping of systems possessing viscous dampers is proposed which also utilises the strength proportions chosen by the designer at the start of the process. The DBD approach developed is relatively quick to use, enabling the seismic design of the 8-storey case study structure to be undertaken without the development of a computer model. To verify the ability of the design method, non-linear time-history analyses are undertaken using a suite of spectrum-compatible accelerograms. These analyses demonstrate that the design solution successfully achieves the design objectives to limit building deformations, and therefore damage.

Direct Displacement-Based Design of a RC wall-steel EBF dual system with added dampers

2011 ◽  
Vol 44 (3) ◽  
pp. 167-178 ◽  
Author(s):  
Timothy J. Sullivan
Keyword(s):  
Linear Time ◽  
Design Method ◽  
Design Procedure ◽  
Time History ◽  
Dual System ◽  
System Structure ◽  
Design Solution ◽  
Equivalent Viscous Damping ◽  
Direct Displacement Based Design ◽  
Displacement Based

An innovative application of Direct Displacement-Based Design (DBD) is presented for a modern 8-storey dual system structure consisting of interior concrete walls in parallel to a number of large steel eccentrically braced frames, fitted with visco-elastic dampers at link positions. The innovative DBD methodology lets the designer directly control the forces in the structure by choosing strength proportions at the start of the design procedure. The strength proportions are used to establish the displaced shape at peak response and thereby establish the equivalent single-degree-of-freedom system design displacement, mass and effective height. A new simplified formulation for the equivalent viscous damping of systems possessing viscous dampers is proposed which also utilises the strength proportions chosen by the designer at the start of the process. The DBD approach developed is relatively quick to use, enabling the seismic design of the 8-storey case study structure to be undertaken without the development of a computer model. To verify the ability of the design method, non-linear time-history analyses are undertaken using a suite of spectrum-compatible accelerograms. These analyses demonstrate that the design solution successfully achieves the design objectives to limit building deformations, and therefore damage.

The effect of element strength assignment on the torsional response of stiffness-eccentric systems

2013 ◽  
Vol 40 (7) ◽  
pp. 655-662
Author(s):  
George K. Georgoussis
Keyword(s):  
Structural Design ◽  
Shear Force ◽  
Ground Motions ◽  
Building Structures ◽  
Centre Of Mass ◽  
Base Shear ◽  
Structural Behaviour ◽  
Torsional Response ◽  
Building Models ◽  
Storey Building

Building structures of low or medium height are usually designed with a pseudostatic approach using a base shear much lower than that predicted from an elastic spectrum. Given this shear force, the objective of this paper is to evaluate the effect of the element strength assignment (as determined by several building codes) on the torsional response of inelastic single-storey eccentric structures and to provide guidelines for minimizing this structural behaviour. It is demonstrated that the expected torque about the centre of mass (CM) may be, with equal probability, positive (counterclockwise) or negative (clockwise). This result means that the torsional strength should also be provided in equal terms in both rotational directions, and therefore the base shear and torque (BST) surface of a given system must be symmetrical (or approximately symmetrical). In stiffness-eccentric systems, appropriate BST surfaces may be obtained when a structural design is based on a pair of design eccentricities in a symmetrical order about CM, and this is shown in representative single-storey building models under characteristic ground motions.

Impact of Damping Scaling Factors on Direct Displacement-Based Design

2016 ◽  
Vol 32 (2) ◽  
pp. 843-859 ◽  
Author(s):  
Cuiyan Kong ◽  
Mervyn J. Kowalsky
Keyword(s):  
Response Spectra ◽  
Equivalent Linearization ◽  
Base Shear ◽  
Limit States ◽  
Scaling Factors ◽  
Equivalent Viscous Damping ◽  
Direct Displacement Based Design ◽  
Displacement Response Spectra ◽  
Performance Limit States ◽  
Displacement Based

Damping scaling factors (DSFs) play an important role in direct displacement-based design (DDBD) as they provide a means to establish displacement response spectra for damping values beyond 5%. Response spectra for multiple damping values are needed for DDBD as the approach relies on equivalent linearization, expressed in the form of effective stiffness and equivalent viscous damping, to establish design forces for prescribed performance limit states. In the past, DSFs based on the Eurocode have been employed for DDBD; however, recent research has resulted in more robust DSF models. This paper examines the accuracy of the current DSF equation used in DDBD across the parameters that are important for structural design. A nonlinear regression analysis is performed based on the data obtained by the Rezaeian et al. (2014) model, and a base shear adjustment factor (SAF) is proposed for application to the DDBD base shear equation.

scholarly journals EVALUASI KINERJA STRUKTUR GEDUNG DUAL SYSTEM BERBASIS KINERJA

2018 ◽  
Vol 1 (2) ◽  
pp. 91
Author(s):  
Dave Fernando Indotjoa ◽  
Daniel Christianto ◽  
Hadi Pranata
Keyword(s):  
Dual System ◽  
Performance Based Design ◽  
Direct Displacement Based Design ◽  
Fema 356 ◽  
Displacement Based

Struktur penahan gaya gempa secara umum memakai konsep Force Based Design. Konsep dari Force Based Design hanya berdasarkan kondisi elastis struktur dan tidak sesuai dengan kondisi sebenarnya dimana struktur gedung mengalami kondisi inelastis ketika mengalami peristiwa gempa. Sehingga perlu dilakukan analisis evaluasi kinerja struktur untuk mengetahui kinerja gedung ketika mencapai kondisi inelastis yang merupakan konsep Performance Based Design. Dalam penilitian ini terdapat dua metode yang dipakai untuk analisis gedung ketika mengalami kondisi inelastis, yaitu metode Direct Displacement Based Design dan metode analisis Pushover. Tujuan dalam penelitian ini untuk mengidentifikasi dan membandingkan kinerja struktur bangunan antara metode-metode tersebut. Penelitian digunakan program ETABS untuk mengetahui berapa besar gaya dan perpindahan yang dapat ditahan oleh struktur. Melalui program ETABS dapat diketahui pula level kinerja struktur bangunan tersebut. Tipe struktur bangunan yang dimodelkan berupa bangunan dengan sistem ganda. Bangunan terbuat dari beton bertulang, jarak bentang arah memanjang 53.7 m, jarak bentang arah memendek 36.2 m, dengan ketinggian 64.5 m, tinggi tiap lantai 4.3 m. Penelitian mengacu pada SNI 1726:2012, ATC-40, FEMA 356, dan FEMA 440.

scholarly journals Evaluasi Geser Dasar Minimun pada SNI 1726-2012

2019 ◽  
Vol 10 (2) ◽  
pp. 166-184
Author(s):  
Johnny Setiawan ◽  
Iswandi Imran
Keyword(s):  
Linear Time ◽  
Damage Control ◽  
Time History ◽  
Time History Analysis ◽  
Performance Level ◽  
Life Safety ◽  
Base Shear ◽  
History Analysis ◽  
Story Drift ◽  
Immediate Occupancy

Terdapat cukup banyak perubahan pada SNI 1726-2012, salah satunya adalah adanya persyaratanbatas geser dasar minimum (minimum base shear) yang tidak ada pada peraturan sebelumnya.Metode yang akan dilakukan adalah bangunan gedung dengan klasifikasi ketinggian rendah,sedang dan tinggi akan dianalisis dengan menerapkan geser dasar minimum dan tanpa geser dasarminimum. Analisis yang akan digunakan adalah analisis ragam spektrum respons (ResponsSpectrum Analysis, RSA), analisis respons riwayat waktu (Time History Analysis, THA) dananalisis respons riwayat waktu non linier (Non Linear Time History Analysis, NLTHA). Hasilanalisis menunjukkan bahwa pada peraturan SNI 1726-2012 dengan adanya persyaratan batasangeser dasar minimum dapat menjamin kinerja struktur sesuai dengan yang diharapkan.Kekhawatiran adanya batasan geser dasar minimum pada SNI 1726-2012 akan membuat desainmenjadi tidak ekonomis, ternyata tidak terbukti karena tidak memberikan pengaruh signifikanpada hasil desain, khususnya untuk bangunan dengan kategori ketinggian rendah dan sedang.Untuk bangunan dengan klasifikasi bangunan tinggi, analisis dan desain dengan memperhitungansyarat batasan geser dasar minimum dan tanpa memperhitungkan geser dasar minimum dapatmemberikan hasil desain yang baik, tetapi pengecekan pada Level Kinerja (Performance Level)sesuai dengan story drift menunjukkan bahwa analisis dengan memperhitungkan syarat geser dasarminimum memberikan hasil dengan level kinerja yang cukup baik yaitu Immediate Occupancy(IO) hingga Damage Control (DO), sedangkan tanpa memperhitungkan geser dasar minimummemberikan hasil dengan level kinerja yang kurang baik yaitu Life Safety (LS) hingga StructuralStability (SS). Sedangkan pada level kinerja elemen struktur, analisis tanpa memperhitungkangeser dasar minimum menyebabkan banyak elemen struktur yang berada pada level kinerjaCollapse Prevention (CP).

An improvement of direct displacement-based design approach for steel moment-resisting frames controlled by fluid viscous dampers

2021 ◽  
pp. 136943322199249
Author(s):  
Mahsa Noruzvand ◽  
Mohtasham Mohebbi ◽  
Kazem Shakeri
Keyword(s):  
Performance Level ◽  
Design Approach ◽  
Excellent Performance ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frames ◽  
Earthquake Records ◽  
Direct Displacement Based Design ◽  
Moment Resisting ◽  
Displacement Based ◽  
Spectral Velocity

Direct displacement-based design (DDBD) method is one of the most effective methods for performance-base design of structures that has been also employed to design structures controlled by fluid viscous damper (FVD). In previous studies, a modified DDBD has been developed to apply the higher mode effects as well as difference between spectral velocity and pseudo-spectral velocity on the design velocity of FVD. To this end, two constants were defined to correct the damping coefficient of FVD that these correction constants had been determined in a non-classical and iterative manner. In this study, a new classical method is proposed for determining these constant such that no iteration is required in DDBD. In order to be able to introduce this design approach as a reliable framework, its performance is validated under different sets of earthquake records and this design approach is also developed for structures controlled by nonlinear FVD. Steel moment-resisting frames with different numbers of stories have been designed using this method. For comparison, structures have been also designed based on DDBD proposed in previous researches. The results show that DDBD approach improved in this study is capable to achieve the design performance level under different sets of earthquake records and this design approach has more effective performance than previous design methods. Performance of steel moment-resisting frames equipped with nonlinear FVD also shows excellent performance of this design approach in achievement of desirable performance level. Therefore, DDBD approach proposed in this study can be introduced as a new classical and reliable framework because of its simplicity and excellent performance under different sets of earthquakes.

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