Derivation of energy-based base shear force coefficient considering hysteretic behavior and P-delta effects

Uçar, Taner; Merter, Onur

doi:10.1007/s11803-018-0431-3

Cited by 9 publications

(3 citation statements)

References 31 publications

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“…In recent decades, many researchers have studied the idea of using energy-based methods as more reliable scientific methods in comparison with the conventional displacementbased methods [1][2][3]. In fact, the idea suggesting that structures collapse when the energy demand as a design parameter for an earthquake is greater than the amount provided by the structure, was introduced from the earliest days of earthquake engineering development [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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A New Method for Estimating the Input-Energy of MDOF Structures

Davarnia

Azar

2019

NMCE

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Input-energy is the amount of energy that is imposed by an earthquake on a structure and its correlation with structural damage has been studied and demonstrated by many researchers. Since studies concerning seismic energy in multi-degree-of-freedom systems are relatively limited compared with single-degree-of-freedom, in this paper, firstly a theoretical exact method is discussed to calculate the input-energy of the multi-degree-of-freedom elastic oscillators. It is proved that unlike the general rule in mechanics, the superposition theorem is valid for inputenergy in conventional modal analysis. To estimate the input-energy, an approach based on PHSA to predict the Fourier amplitude spectrum, is proposed. The results indicate that the modal mass ratio is not the only decisive parameter in input-energy. Modal input-energy decomposition also confirms the possibility of greater input-energy of higher modes in comparison with fundamental ones or the ones with the higher mass participation ratio, especially for tall buildings located in the near-field seismic zones.

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Section: Introductionmentioning

confidence: 99%

“…(1) which represents two MDOF oscillators are presented. The earthquakes used as input records are in Table(1). In the damped structure, the damping satisfies the Rayleigh's (classical) damping condition.…”

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confidence: 99%

A New Method for Estimating the Input-Energy of MDOF Structures

Davarnia

Azar

2019

NMCE

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“…They showed that the P-Delta effect reduces the lateral load associated to a displacement, afterward leading to a decrease in effective stiffness and an increase in the effective period. Ucar and Merter [14] proposed a modified energy-balance equation for the P-Delta effect by adding the external work of gravity loads. They concluded that by increasing the number of stories, with and without considering the P-Delta effect, energybased base shear force decreases.…”

Section: Introductionmentioning

confidence: 99%

Evaluation the P-Delta Effect on Collapse Capacity of Adjacent Structures Subjected to Far-field Ground Motions

2018

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In urban areas, adjacent structures can be seen in any insufficient distance from each other, because of economic and refusal of acquired minimum separation distance according to seismic previsions. Collapse capacity assessment of structures is one of the important objectives of performance-based seismic engineering. The purpose of this study is to consider the pounding phenomenon and P-Delta effect in seismic collapse capacity assessment of structures. For this purpose, 2-, 4-, 6- and 8-story adjacent structures with different conditions of separation distance among them, were modeled in the OpenSees software. Furthermore, Incremental Dynamic Analyses (IDAs) were performed using 78 far-field ground motion records to compute the collapse capacities of adjacent structures. The results obtained from IDAs for adjacent structures show that during pounding, taller structure reaches its collapse capacity earlier than shorter one. In addition, by considering the P-Delta effect and increasing the distance between adjacent structures, time of collapse and number of impacts increases. According to results, considering the P-Delta effect in modeling has significant influence in seismic collapse capacity assessment of pounding structures.

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A new method for scaling of earthquake records using input energy of structures

Davarnia

Azar

2020

Structural Design Tall Build

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SummaryNonlinear response history analysis is conducted as the most trusted and accurate method in the seismic analysis and design of buildings. Since the selection of appropriate records is inherent in this procedure, numerous attempts have been made to use earthquake records that represent a good prediction of future earthquakes. Scaling existing earthquake records is considered as one of the most important tools to fulfill this goal. This paper introduces a new method for scaling ground motion time histories in which elastic input energy is considered as intensity measure. In the new scaling procedure, the scale factor is obtained by minimizing the residual between the elastic input energy of structures for the desired records and the maximum probable input energy of the target spectrum. The efficiency and the accuracy of the proposed method are evaluated and compared with those resulting from the method of ASCE/SEI 7. The results demonstrate that the records scaled with the proposed method lead to more accurate and efficient demand parameters.

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Derivation of energy-based base shear force coefficient considering hysteretic behavior and P-delta effects

Cited by 9 publications

References 31 publications

A New Method for Estimating the Input-Energy of MDOF Structures

A New Method for Estimating the Input-Energy of MDOF Structures

Evaluation the P-Delta Effect on Collapse Capacity of Adjacent Structures Subjected to Far-field Ground Motions

A new method for scaling of earthquake records using input energy of structures

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