Probabilistic Performance-Based Assessment for Critical Separation Distance of Adjacent Buildings: Theoretical Analysis

Wu, Qiaoyun; Yan, Huichao; Zhu, Hongping; Ding, Lan

doi:10.1061/(asce)cf.1943-5509.0001453

Cited by 10 publications

(2 citation statements)

References 33 publications

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“…For this purpose, a probabilistic seismic demand model (PSDM) in terms of the peak relative displacement between the adjacent structures was introduced. Finally, Wu et al [36] developed a probabilistic procedure to determine the critical separation distance. They assessed the pounding probability in 50 years in terms of the peak relative displacement between the adjacent structures.…”

Section: Introductionmentioning

confidence: 99%

A New Method for Defining the Optimal Separation Gap Distance and the Acceptable Structural Pounding Risk on Multistory RC Structures

Flenga,

Favvata

2024

Applied Sciences

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A proposal to control the structural pounding hazard imposed on multistory reinforced concrete (RC) structures is presented. The main goal is to guarantee the seismic performance of a structure with an acceptable (predefined) risk-targeted parameter without the need to eliminate structural pounding collisions. The key target parameters of this study are the annual probability of exceeding an engineering demand parameter (EDP) capacity level and the separation distance dg between adjacent structures. In this direction, a method that ensures the performance level of critical EDPs due to structural pounding conditions is proposed. The new method involves two decision frameworks that define (a) the optimal separation gap distance dg,minPt at a targeted value of pounding risk (probability per year) Pt (Decision A) and (b) the minimum acceptable structural pounding risk Pmindg,t at a targeted value of separation gap distance dg,t (Decision B). The demand parameters that are incorporated in the proposed method are the peak relative displacement δmax at the top level of colliding without considering pounding conditions and any other critical EDP due to the structural pounding effect. The overall method is based on two distinct acceptable performance objectives, the POs-δmax and the POs-EDP, defined as a function of P vs. dg. For this purpose, a seismic hazard curve compatible with Eurocode’s 8 hazard zone is adopted, and the corresponding demand hazard curves of δmax and EDP are developed. The proposed method is implemented to study the floor-to-floor structural pounding hazard of an eight-story RC frame taking into account different risk-targeted scenarios. The results show that the seismic risk (probability per year) of exceeding the EDP’s capacity level is significantly increased due to structural pounding in comparison to the case of no pounding. Calibration of the structural pounding risk can be obtained by adjusting the separation gap distance dg between the adjacent structures based on the acceptable POs. The POs-δmax is not always an accurate criterion for verifying the capacity level of the critical EDP. Finally, with the proposed method, a variety of POs-EDPs can be used to control the structural pounding risk in terms of dg,minPt and/or Pmindg,t.

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Section: Introductionmentioning

confidence: 99%

A New Method for Defining the Optimal Separation Gap Distance and the Acceptable Structural Pounding Risk on Multistory RC Structures

Flenga,

Favvata

2024

Applied Sciences

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“…Pounding damages to structures, observed in past and recent earthquakes such as the 1985 Mexico earthquake, the 1989 Loma Prieta earthquake, the 2011 Christchurch earthquake, and the 2015 Gorkha earthquake, etc., 1–4 have been demonstrated to be one of the major risks for buildings subjected to earthquake excitations. Past studies in literature related to seismic pounding issues of buildings may be classified into three groups: 1. analysis of behavior and mitigation of structural pounding, 5–20 2. evaluation of building separation required to avoid pounding, 21–28 and 3. probability or performance‐based pounding analysis and design for buildings 29–36 …”

Section: Introductionmentioning

confidence: 99%

Evaluation of critical separation distance to avoid seismic pounding between buildings: A spectral approach

Lin

2021

Earthq Engng Struct Dyn

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Determining a minimum separation distance required to avoid seismic pounding between adjacent buildings is a capacity‐demand design issue. This study developed a spectral approach to evaluate the expected minimum separation demand (referred to as the critical separation distance, [CSD]) to prevent pounding between buildings during strong earthquake motions. Presented firstly in this paper is an analytical procedure for evaluating the relative displacement process at the potential pounding location between two adjacent buildings during earthquake motions. The procedure is based on random vibration theory and modal analysis with application of the well‐known CQC rule. Subsequently, an approximate nonlinear closed‐form solution for evaluating CSD is derived, by means of a simplified spectral‐based procedure with introducing the concept of equivalent linearization of nonlinear hysteretic behavior and the effective correlation coefficients of the generalized coordinates of equivalent linearized systems to consider inelastic vibration phase between buildings. Finally, the CSDs between two buildings having different heights and the same height for various combinations of buildings with different fundamental periods are separately examined as verification examples of the proposed approach. The accuracy of solution is demonstrated by comparing computed results with corresponding numerical results from nonlinear response history analyses (RHAs). The results show that the proposed approach provides a reliable solution in predicting the separation demand of buildings during earthquake motions.

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Probabilistic seismic assessment of the pounding risk based on the local demands of a multistory RC frame structure

Flenga

Favvata

2021

Engineering Structures

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Probabilistic Performance-Based Assessment for Critical Separation Distance of Adjacent Buildings: Theoretical Analysis

Cited by 10 publications

References 33 publications

A New Method for Defining the Optimal Separation Gap Distance and the Acceptable Structural Pounding Risk on Multistory RC Structures

A New Method for Defining the Optimal Separation Gap Distance and the Acceptable Structural Pounding Risk on Multistory RC Structures

Evaluation of critical separation distance to avoid seismic pounding between buildings: A spectral approach

Probabilistic seismic assessment of the pounding risk based on the local demands of a multistory RC frame structure

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