scholarly journals Challenges in Evaluating Seismic Collapse Risk for RC Buildings

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Jin Zhou ◽  
Zhelun Zhang ◽  
Tessa Williams ◽  
Sashi K. Kunnath
Keyword(s):  
Ground Motion ◽  
Seismic Vulnerability ◽  
Ground Motions ◽  
Primary System ◽  
Fragility Functions ◽  
Reinforced Concrete Frame ◽  
Ground Motion Selection ◽  
Concrete Frame ◽  
Frame Building ◽  
Seismic Collapse

AbstractThe development of fragility functions that express the probability of collapse of a building as a function of some ground motion intensity measure is an effective tool to assess seismic vulnerability of structures. However, a number of factors ranging from ground motion selection to modeling decisions can influence the quantification of collapse probability. A methodical investigation was carried out to examine the effects of component modeling and ground motion selection in establishing demand and collapse risk of a typical reinforced concrete frame building. The primary system considered in this study is a modern 6-story RC moment frame building that was designed to current code provisions in a seismically active region. Both concentrated and distributed plasticity beam–column elements were used to model the building frame and several options were considered in constitutive modeling for both options. Incremental dynamic analyses (IDA) were carried out using two suites of ground motions—the first set comprised site-dependent ground motions, while the second set was a compilation of hazard-consistent motions using the conditional scenario spectra approach. Findings from the study highlight the influence of modeling decisions and ground motion selection in the development of seismic collapse fragility functions and the characterization of risk for various demand levels.

Influence of ground motion duration on the dynamic deformation capacity of reinforced concrete frame structures

2021 ◽  
pp. 875529302110338
Author(s):  
Vishvendra Bhanu ◽  
Reagan Chandramohan ◽  
Timothy J Sullivan
Keyword(s):  
Reinforced Concrete ◽  
Ground Motion ◽  
Dynamic Deformation ◽  
Ground Motions ◽  
Geometric Mean ◽  
Deformation Capacity ◽  
Reinforced Concrete Frame ◽  
Moment Frame ◽  
Concrete Frame ◽  
Reinforced Concrete Frame Structures

This study investigates the influence of ground motion duration on the dynamic deformation capacity of a suite of 10 modern reinforced concrete moment frame buildings. A robust numerical algorithm is proposed to estimate the dynamic deformation capacity of a structure by conducting incremental dynamic analysis. The geometric mean dynamic deformation capacity of the considered buildings was, on average, found to be 26% lower under long duration ground motions, compared to spectrally equivalent short duration ground motions. A consistent effect of duration on dynamic deformation capacity was observed over a broad range of structural periods considered in this study. Response spectral shape, however, was found to not significantly influence dynamic deformation capacity. These results indicate that the effect of duration could be explicitly considered in seismic design codes by modifying the deformation capacities of structures.

Seismic Vulnerability of Reinforced Concrete Frame with Unreinforced Masonry Infill Due to Main Shock–Aftershock Earthquake Sequences

2015 ◽  
Vol 31 (3) ◽  
pp. 1427-1449 ◽  
Author(s):  
Solomon Tesfamariam ◽  
Katsuichiro Goda ◽  
Goutam Mondal
Keyword(s):  
Reinforced Concrete ◽  
Seismic Vulnerability ◽  
Main Shock ◽  
Ground Motions ◽  
Period Change ◽  
Reinforced Concrete Frame ◽  
Site Class ◽  
Concrete Frame ◽  
Rc Frames ◽  
Hazard Level

This paper presents a parametric study on the inelastic response of six-story reinforced concrete (RC) frames subjected to main shock–aftershock (MS-AS) ground motions. For this purpose, one bare frame (BF) and four masonry RC frames with two infill thicknesses (75 mm or 125 mm) and two infill patterns (open ground story or fully infilled) are considered. They are situated at site class C in Vancouver, Canada, and are designed for office occupancy according to the 2005 National Building Code of Canada. The five frames are subjected to 100 ensembles of MS-AS ground motions scaled to seismic hazard level corresponding to the return period of 2,500 years. For each sequence of earthquakes, change in the fundamental period ( T1) and inter-story drift (ISD) for both MS-AS sequences are quantified. The analysis results show that the period change and ISD were significant for BF, whereas the infilled frames sustained small damage with negligible change in T1.

The Influence of near-Fault Ground Motions on the Seismic Response of Reinforced Concrete Frame

2011 ◽  
Vol 90-93 ◽  
pp. 2633-2639
Author(s):  
Chang Hao Zhang ◽  
Wei Wang ◽  
Hu Wang ◽  
Xun Tao Wang
Keyword(s):  
Reinforced Concrete ◽  
Ground Motion ◽  
Ground Motions ◽  
Time History ◽  
Far Field ◽  
Base Shear ◽  
Reinforced Concrete Frame ◽  
Structural Dynamic ◽  
Concrete Frame ◽  
Near Fault

This paper examined the engineering characteristics of the near-fault ground motion. The four-story reinforced concrete frame was designed under Code for seismic design of building (GB50011-2010).The SAP2000 software was applied to model it, and the nonlinear time history analyses of structure were implemented. Near-fault ground motions with forward directivity and fling-step and far field ground motions were selected as seismic inputs．The results show that in terms of some structural dynamic response parameters, such as the vertex displacement, between the corner of the layer displacement, and the base shear et al., the structural responses to the ground motion with near-fault are increased by considerable magnitudes when the seismic responses of structures step into the elastic-plastic stage, compared with far-field ground motion, and the influence of damaging the mid-lower structure is significantly greater.

Ground motion selection for the evaluation of residual inter-story drifts in moment-resisting reinforced concrete frame buildings

2020 ◽  
Vol 136 ◽  
pp. 106217
Author(s):  
Federico Valenzuela-Beltrán ◽  
Alfredo Reyes-Salazar ◽  
Edén Bojórquez ◽  
Robespierre Chávez ◽  
Juan Bojórquez ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Ground Motion ◽  
Reinforced Concrete Frame ◽  
Ground Motion Selection ◽  
Concrete Frame ◽  
Frame Buildings ◽  
Moment Resisting ◽  
Selection For

Evaluation of SCEC CyberShake Ground Motions for Engineering Practice

2019 ◽  
Vol 35 (3) ◽  
pp. 1311-1328 ◽  
Author(s):  
Ganyu Teng ◽  
Jack Baker
Keyword(s):  
Los Angeles ◽  
Ground Motion ◽  
Ground Motions ◽  
Response Spectra ◽  
Building Design ◽  
Empirical Models ◽  
Soil Conditions ◽  
Engineering Practice ◽  
Ground Motion Selection ◽  
Promising Source

This paper evaluates CyberShake (version 15.12) ground motions for potential application to high-rise building design in the Los Angeles region by comparing them against recordings from past earthquakes as well as empirical models. We consider two selected sites in the Los Angeles region with different underlying soil conditions and select comparable suites of ground motion records from CyberShake and the NGA-West2 database according to the ASCE 7-16 requirements. Major observations include (1) selected ground motions from CyberShake and NGA-West2 share similar features, in terms of response spectra and polarization; (2) when selecting records from Cyber-Shake, it is easy to select motions with sources that match the hazard deaggregation; (3) CyberShake durations on soil are consistent with the empirical models considered, whereas durations on rock are slightly shorter; (4) occasional excessive polarization in ground motion is produced by San Andreas fault ruptures, though those records are usually excluded after the ground motion selection. Results from this study suggest that CyberShake ground motions are a suitable and promising source of ground motions for engineering evaluations.

Evaluation of the seismic performance of a code-conforming reinforced-concrete frame building—from seismic hazard to collapse safety and economic losses

2007 ◽  
Vol 36 (13) ◽  
pp. 1973-1997 ◽  
Author(s):  
Christine A. Goulet ◽  
Curt B. Haselton ◽  
Judith Mitrani-Reiser ◽  
James L. Beck ◽  
Gregory G. Deierlein ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Seismic Hazard ◽  
Seismic Performance ◽  
Economic Losses ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Frame Building

scholarly journals Assessment of Seismic Vulnerability of Reinforced Concrete Frame buildings

2018 ◽  
Vol 149 ◽  
pp. 02036
Author(s):  
Cherifi Fatiha ◽  
Farsi Mohammed ◽  
Kaci Salah
Keyword(s):  
Reinforced Concrete ◽  
Seismic Vulnerability ◽  
Reinforced Concrete Frame ◽  
Nonlinear Method ◽  
Seismic Risk Analysis ◽  
Building Inventory ◽  
Concrete Frame ◽  
Capacity Curves ◽  
The North ◽  
Frame Buildings

The seismic activity remains strong in the north of Algeria since no less than 30 earthquakes per month are recorded. The large number of structures built before the introduction of the seismic standards represents a high seismic risk. Analysis of damage suffered during the last earthquakes highlighted the vulnerability of the existing structures. In this study the seismic behavior of the existing buildings in Tizi-Ouzou city, located in the north of Algeria, is investigated. To make this assessment, a database was created following a building inventory based on a set of technical folders and field visits. The listed buildings have been classified into different typologies. Only reinforced concrete frame buildings are considered in this paper. The approach adopted to estimate structures damage is based on four main steps: 1) construction of capacity curves using static nonlinear method “push-over”, 2) estimate of seismic hazard, 3) determination of performance points, and finally 4) deduction of damage levels.

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