A direct displacement-based seismic design method using a MDOF equivalent system: application to R/C framed structures

Muho, Edmond V.; Jia, Qingxuan; Beskos, D.E.

doi:10.1007/s10518-020-00857-5

Cited by 23 publications

(16 citation statements)

References 16 publications

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“…3). More details about the 𝐷𝐷𝐵𝐷 procedure can be found in Calvi and Sullivan (2008), Sullivan et al (2012), Muho et al 2020 andKalapodis et al (2022). Then, aiming at achieving a fair comparison, the same frame is also designed according to EC8 (2004).…”

Section: Numerical Examplementioning

confidence: 99%

“…The first is associated with the replacement of the original multi-degree-of-freedom (𝑀𝐷𝑂𝐹) structure by a single-degree-of-freedom (𝑆𝐷𝑂𝐹) one, which entails significant loss of modeling accuracy. To this end, (Muho et al 2020) developed an improved version of the 𝐷𝐷𝐵𝐷 method, regarding the seismic design of moment resisting frames (𝑀𝑅𝐹𝑠) made of R/C, which employs an equivalent 𝑀𝐷𝑂𝐹 system, produced with the aid of deformation dependent equivalent modal damping ratios (Muho et al 2019). The work of Muho et al (2020) was expanded in steel plane i) moment resisting frames (𝑀𝑅𝐹𝑠), ii) eccentrically braced frames (𝐸𝐵𝐹𝑠) and iii) buckling restrained braced frames (𝐵𝑅𝐵𝐹𝑠) by Kalapodis et al (2022).…”

Section: Introductionmentioning

confidence: 97%

“…To this end, (Muho et al 2020) developed an improved version of the 𝐷𝐷𝐵𝐷 method, regarding the seismic design of moment resisting frames (𝑀𝑅𝐹𝑠) made of R/C, which employs an equivalent 𝑀𝐷𝑂𝐹 system, produced with the aid of deformation dependent equivalent modal damping ratios (Muho et al 2019). The work of Muho et al (2020) was expanded in steel plane i) moment resisting frames (𝑀𝑅𝐹𝑠), ii) eccentrically braced frames (𝐸𝐵𝐹𝑠) and iii) buckling restrained braced frames (𝐵𝑅𝐵𝐹𝑠) by Kalapodis et al (2022). The second drawback of the 𝐷𝐷𝐵𝐷 method regards the simplistic expressions, provided for the calculation of the yield drift, which is the catalyst for an accurate derivation of the displacement profile of the structure.…”

Section: Introductionmentioning

confidence: 97%

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First Yield Inter-storey Drift Ratios of Composite (Steel/concrete) and Steel Frames for the Purposes of the Direct Displacement Based Design Method

Serras

Kalapodis

Muho

2022

Preprint

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The present work provides expressions about the Inter-storey Drift Ratios at the damage state of the first yield (IDRy). The proposed expressions are compatible with i) composite (steel/concrete) moment resisting frames (MRFs), ii) steel MRFs, iii) steel eccentrically braced frames (EBFs) and iv) steel buckling restrained braced frames (BRBFs) for soil types B and D. These expressions have been derived by means of statistical and regression analysis incorporating a large databank composed by numerous IDR values that correspond to the first yield of the aforementioned under-study frames. The databank has been produced after extensive dynamic analyses, considering a plethora of seismic recordings compatible with different soil types. The validity of these expressions is proved through an indicative number of numerical examples. Most importantly, the proposed expressions may constitute a very useful tool towards the direct displacement based design (DDBD), where the existing equations for the calculation of the IDRy are crude and oversimplified, leading to unreliable results. The superiority of the proposed expressions over those stipulated in the DDBD code is verifying through an additional numerical example.

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Section: Numerical Examplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

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First Yield Inter-storey Drift Ratios of Composite (Steel/concrete) and Steel Frames for the Purposes of the Direct Displacement Based Design Method

Serras

Kalapodis

Muho

2022

Preprint

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“…The ID R max values of Equations 1–3 are assumed to be known given that the structure was designed directly for a target IDR. This is true for a building designed by displacement-based methods, such as the direct displacement-based design (Muho et al, 2020a; Priestley et al, 2007). However, structures designed by force-based design methods, such as the method of EC8 (2004), do not have a specific target IDR.…”

Section: Proposed Expressions To Estimate the Pfa Distribution At Different Performance Levelsmentioning

confidence: 99%

“…Hence, PFA is directly associated with the maximum deformation value of the structure in terms of the interstory drift ratio (IDR). Thus, it can be used in line with the various PBSD methods, such as the direct displacement-based design methods (Muho et al, 2020a; Priestley et al, 2007), to design NSCs complying with the deformation limits or performance levels of the supporting structure. The shapes of the PFA profiles are described here by a few line segments connected at key points on floor levels.…”

Section: Introductionmentioning

confidence: 99%

Deformation-dependent peak floor acceleration for the performance-based design of nonstructural elements attached to R/C structures

et al. 2021

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This study introduces a simple and efficient method to determine the peak floor acceleration (PFA) at different performance levels for three types of plane reinforced concrete (RC) structures: moment-resisting frames (MRFs), infilled–moment-resisting frames (I-MRFs), and wall-frame dual systems (WFDSs). By associating the structural maximum PFA response with the deformation response, the acceleration-sensitive nonstructural components, and the building contents, can be designed to adhere to the performance-based seismic design of the supporting structure. Thus, the proposed method can accompany displacement-based seismic design methods to design acceleration-sensitive nonstructural elements to comply with the deformation target of the supporting structure. The PFA response shape is represented by line segments defined by key points corresponding to certain floor levels. These key points are defined by explicit empirical expressions developed herein. The maximum PFA response is correlated with the maximum interstory drift ratio (IDR) and other vital characteristics of the supporting structure such as the fundamental period. The proposed expressions are established based on extensive nonlinear dynamic analyses of 19 MRFs, 19 WFDSs, and 19 I-MRFs under 100 far-fault ground motions scaled to capture different deformation targets. Realistic examples demonstrate the efficiency of the proposed method to assess the PFA response at a given IDR, making the method suitable in the framework of performance-based design.

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Seismic force demand on RC shear walls for direct displacement‐based design

Abdi

Khosravi

Jafarieh

2022

Structural Concrete

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This article aims to investigate seismic force demand on RC shear walls which are designed using direct displacement-based design (DDBD) method. For this purpose, first 12 shear walls were designed using DDBD approach and then were modeled nonlinearly in OpenSees using fiber section elements. Each wall was subjected to 45 artificial ground motions and the seismic force demand, including the shear force and the bending moment, were determined along the wall height. The nonlinear dynamic analysis results indicated that the seismic force demand was significantly amplified relative to the design forces. This amplification, which was due to the higher mode effects, is mainly a function of structural period and ductility demand. To find new shear and moment envelopes for capacity design, two envelop shapes compatible with internal force pattern along the wall height were selected. Then, the required equations were presented for envelope parameters based on the regression analysis of the results. The comparison of seismic force demand with proposed and previous envelopes indicates the superiority of new proposed envelopes for DDBD approach.

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A direct displacement-based seismic design method using a MDOF equivalent system: application to R/C framed structures

Cited by 23 publications

References 16 publications

First Yield Inter-storey Drift Ratios of Composite (Steel/concrete) and Steel Frames for the Purposes of the Direct Displacement Based Design Method

First Yield Inter-storey Drift Ratios of Composite (Steel/concrete) and Steel Frames for the Purposes of the Direct Displacement Based Design Method

Deformation-dependent peak floor acceleration for the performance-based design of nonstructural elements attached to R/C structures

Seismic force demand on RC shear walls for direct displacement‐based design

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