An investigation of P-delta effect in conventional seismic design and direct displacement-based design using elasto-plastic SDOF systems

Pourali, Nasir; Khosravi, Horr; Dehestani, Mehdi

doi:10.1007/s10518-018-0460-3

Cited by 17 publications

(9 citation statements)

References 29 publications

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“…Figure 24a shows the graphical representation of regression analysis for proposed shear amplification factor (ω V Þ. Suggested equations for shear envelope are summarized in Equations (23)(24)(25).…”

Section: New Proposed Capacity Envelopsmentioning

confidence: 99%

“…Among different seismic design procedures, Direct Displacement‐Based Design (DDBD) has attracted the attention of many researchers in the recent years 18–26 . Priestley et al 10 firstly take the higher mode effect into account for direct displacement‐based design of shear walls.…”

Section: Introductionmentioning

confidence: 99%

“…Among different seismic design procedures, Direct Displacement-Based Design (DDBD) has attracted the attention of many researchers in the recent years. [18][19][20][21][22][23][24][25][26] Priestley et al 10 firstly take the higher mode effect into account for direct displacement-based design of shear walls. They proposed shear force and bending moment envelopes for capacity design of shear walls in DDBD procedure.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: New Proposed Capacity Envelopsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Paulay, 2 Bernal, 3 Miranda and Akkar, 7 Amara et al 8 ). The second approach, however, with the increasing popularity of displacement-based design methodologies, is also gaining attention, as shown by studies conducted by Asimakopoulos et al, 9 Belleri et al, 10 Pourali et al 11 and De Francesco and Sullivan. 12,13 In previous studies, as in some current codes and standards, there is no distinction between strength and displacement amplifications due to 𝑃Δ effects, as highlighted by Wei et al 14 This is likely to be the result of a direct (but improper) extension of the 𝑃Δ analysis of elastic systems to inelastic.…”

Section: Introductionmentioning

confidence: 99%

Accounting for hysteretic characteristics in P‐delta analysis of structures

Francesco

Sullivan

2023

Earthq Engng Struct Dyn

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Studies in the literature have shown that P‐delta () effects are highly influenced by the hysteretic characteristics of a structural system. However, international buildings and bridge codes prescribe ‐induced amplification factors, limits for negligible effects and limits for dynamic instability that neglect this influence. As a result, different margins of safety against actions are currently specified for different structural systems, with steel structures, for example, presenting reduced margins of safety with respect to concrete structures. Adopting a sub‐set of the PEER earthquake record database composed of 1964 earthquake records, this paper presents a statistical analysis of displacement amplification ratios for systems with different hysteretic models, fundamental periods and ductility levels. In terms of both elastic and inelastic stability coefficients, limit values of the stability coefficient for negligible effects and dynamic instability are proposed for the most common structural typologies, such as steel, well and poorly detailed reinforced concrete, and self‐centering structures. Analytical estimates of the median, 84th and 98th percentile values of the displacement amplification that take into account the combined effect of stability coefficient, ductility level and hysteretic properties are proposed.

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“…The P-Δ effect generally increases the displacement response of structures. It can even cause dynamic instability when the structure is subjected to severe seismic movements [8]. Regarding the irregularity of stiffness; Zhao, Hu y Long [9] mention that the vertical irregularity or height of a structure is introduced by abrupt changes or discontinuities in the configuration (such as dimension, soil mass, rigidity, resistance or their combination) along its vertical direction.…”

Section: Introductionmentioning

confidence: 99%

Influence of the P-delta Effect and Stiffness Irregularity on the Structural Behavior of Reinforced Concrete Buildings

Zavala

Torres

Moreno

2022

J. Phys.: Conf. Ser.

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In this research, the influence of the stiffness irregularity and the p-delta effect on the structural behavior of a reinforced concrete building is analyzed. The main objective is to determine the impact of the stiffness irregularity and the p-delta effect on the structural behavior in regular and irregular buildings. First, the linear dynamic analysis procedure is performed in order to determine the structural response in terms of drifts, shear force and moments per floor. Subsequently, we proceed with the nonlinear static analysis procedure to obtain the capacity curve of the structure. The post elastic stiffness and the overall ductility of the structure are determined from the capacity curve. Finally, a comparative analysis of the responses from the linear and nonlinear analysis is carried out to determine the percentage variation of the results. When analyzing the structures that consider the stiffness irregularity and the p-delta effect, variations of up to 16.50%, 11.00% and 14.00% have been obtained in drifts, shear force and moments per floor respectively, which are considerable values. When the p-delta effect is considered in structures with the presence of stiffness irregularity, there is a variation in stiffness of up to 59.85%. With this result it is explained that the p-delta effect produces a greater degradation of the overall stiffness of the structure.

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An investigation of P-delta effect in conventional seismic design and direct displacement-based design using elasto-plastic SDOF systems

Cited by 17 publications

References 29 publications

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

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

Accounting for hysteretic characteristics in P‐delta analysis of structures

Influence of the P-delta Effect and Stiffness Irregularity on the Structural Behavior of Reinforced Concrete Buildings

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