A seismic design method for reinforced concrete moment resisting frames using modal strength reduction factors

Muho, Edmond V.; Papagiannopoulos, George A.; Beskos, D.E.

doi:10.1007/s10518-018-0436-3

Cited by 12 publications

(4 citation statements)

References 24 publications

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“…In this regard, modal parameter identification (MPI), especially natural frequencies and damping ratios, of civil structures has demonstrated to be critical because these parameters can reflect vibration characteristics (Rainieri et al, 2018). MPI has been extensively applied in damage detection (Magalhães et al, 2012), modal updating (Bagheri et al, 2018), vibration control (Bakule et al, 2016), and seismic design (Muho et al, 2019). Because operational modal analysis is practical and inexpensive, an increasing number of researchers are exploring techniques using ambient vibration (Amezquita-Sanchez et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Modal parameter identification of structures based on short-time narrow-banded mode decomposition

Zhou

Zhang

et al. 2020

Advances in Structural Engineering

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The accurate estimation of natural frequencies and damping ratios is critical for civil structures. In this article, a method based on short-time narrow-banded mode decomposition is proposed to analyze the modal parameters of civil structures. In this approach, short-time narrow-banded mode decomposition is applied to identify time-varying structures with free vibration responses. On the contrary, by analysis of the weighting factors α and β, short-time narrow-banded mode decomposition is improved to estimate the parameter of time-invariant systems. In the case of enhanced short-time narrow-banded mode decomposition, the original short-time narrow-banded mode decomposition approach is modified in two ways. First, the instantaneous frequency term of the objective function is removed, and one weighting factor remains, that is, α in the objective function. Second, a technique is provided to automatically detect the optimum value of α. Two numerical examples, that is, a three-degree-of-freedom time-variant system and a simple model of the Lysefjord bridge are provided. In addition, an experiment with a real-life pedestrian bridge located at Tufts University, United States, is used to demonstrate the applicability of the proposed method. The analysis results indicate that the proposed method can easily identify high-quality natural frequencies and damping ratios.

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Section: Introductionmentioning

confidence: 99%

Modal parameter identification of structures based on short-time narrow-banded mode decomposition

Zhou

Zhang

et al. 2020

Advances in Structural Engineering

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“…All motions were selected from the PEER database (Pacific Earthquake Engineering Research Center (PEER), 2011) and classified based on their shear wave velocity to four groups of 25 motions corresponding to the four soil classes A, B, C, and D of EC8 ( 2004). Details about these motions can be found in Muho et al (2019).…”

Section: Creation Of Response Databank Of Rc Structuresmentioning

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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“…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: 99%

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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A seismic design method for reinforced concrete moment resisting frames using modal strength reduction factors

Cited by 12 publications

References 24 publications

Modal parameter identification of structures based on short-time narrow-banded mode decomposition

Modal parameter identification of structures based on short-time narrow-banded mode decomposition

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

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

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