scholarly journals Rapid assessment of peak storey drift demands on reinforced concrete frame buildings

2019 ◽  
Vol 52 (3) ◽  
pp. 109-118
Author(s):  
Timothy J. Sullivan
Keyword(s):  
Reinforced Concrete ◽  
Linear Time ◽  
Rapid Assessment ◽  
Time History ◽  
Seismic Assessment ◽  
Rc Frame ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Frame Buildings ◽  
Rc Frame Buildings

The peak storey drift demands that an earthquake imposes on a building can be assessed through a detailed engineering seismic assessment or recorded if a building is instrumented. However, for the rapid seismic assessment of a large number of buildings, it is desirable to have a simplified means of estimating storey drift demands. Consequently, this paper proposes a simplified means of quickly estimating storey drift demands on reinforced concrete (RC) frame buildings. Expressions for peak storey drift demand as a function of ground motion intensity are developed by utilising concepts and simplifications available from displacement-based seismic design and assessment methods. The performance of the approach is gauged by comparing predicted storey drift demands with those obtained from rigorous non-linear time-history analyses for a number of case study buildings. The promising results suggest that the approach proposed will be useful for rapidly assessing the likelihood of damage to a range of drift-sensitive elements in modern RC frame buildings.

scholarly journals Cost effectiveness of code base shear requirements for reinforced concrete frame structures

1978 ◽  
Vol 11 (2) ◽  
pp. 85-93
Author(s):  
D. G. Elms ◽  
D. Silvester
Keyword(s):  
Reinforced Concrete ◽  
Time History ◽  
Capital Cost ◽  
Base Shear ◽  
Reinforced Concrete Frame ◽  
Total Cost ◽  
Concrete Frame ◽  
Earthquake Losses ◽  
Frame Buildings ◽  
Code Base

The appropriateness of the overall base shear levels prescribed by
 the New Zealand Loadings Code NZS4203:1976 is investigated for reinforced concrete frame buildings. Six-storey structures were designed to different base shear levels and total costs were computed: total cost takes account of capital cost, averaged direct economic loss due to earthquakes, and indirect earthquake losses. Damage levels were obtained from computer time-history analyses. It is shown that the code base shear levels are
 of the right order of magnitude for reinforced concrete frame buildings, but that the total cost of such buildings is insensitive to design
base shear level. The increase in capital cost of a concrete frame building due to earthquake design requirements is of the order of 4%.

scholarly journals Seismic behavior and retrofitting of reinforced concrete moment resistant frames

2021 ◽  
Author(s):  
Shahram Talebi
Keyword(s):  
Reinforced Concrete ◽  
Linear Time ◽  
Time History ◽  
Fiber Reinforced Polymers ◽  
Frame Structures ◽  
Reinforced Concrete Frame ◽  
Damage Potential ◽  
Concrete Frame ◽  
Seismic Zones ◽  
Reinforced Concrete Frame Structures

Many multistory reinforced concrete frame structures built prior to 1970's located in seismic zones have been designed only for gravity loads without any considerations for lateral loads. These structures are referred to as Gravity Load Designed (GLD) frames. The lack of seismic considerations in GLD structures results in non-ductile behavior that may cause the lateral load resistance of these buildings to be insufficient for even moderate earthquakes. Based on the current Canadian practice as prescribed by CAN3-A23.3 1994, reinforced concrete structures located in seismic zones should be designed as ductile or nominally ductile frames. In this study, a typical 5-story frame building is designed as (a) ductile, (b) nominally ductile and (c) GLD frame. Analytical investigation is performed to evaluate and to compare the performance of each frame. The study includes "pushover" analysis and non-linear time-history analysis. The results in terms of story displacement, ductility, shear, drift, sequence of cracking and yielding and the damage potential are presented. As a result of the poor performance of the GLD frame, it is retrofitted with fiber-reinforced polymers (FRP). Different retrofitting schemes using FRP are used to compare the behavior in terms of ductility. In this study, the behavior of the retrofitted frame is compared with the that of the GLD frame. Based on the results of this study, a guideline for improving the seismic performance of reinforced concrete frame structures is provided.

Evaluation of the effects of spectrum-compatible seismic excitations on the response of medium-height reinforced concrete frame buildings

2006 ◽  
Vol 33 (10) ◽  
pp. 1304-1319 ◽  
Author(s):  
Nove Naumoski ◽  
Murat Saatcioglu ◽  
Lan Lin ◽  
Kambiz Amiri-Hormozaki
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Time History ◽  
Reinforced Concrete Frame ◽  
Seismic Excitations ◽  
Period Range ◽  
Design Spectrum ◽  
Concrete Frame ◽  
Frame Buildings ◽  
Artificial Accelerograms

Spectrum-compatible seismic excitations are required when dynamic time-history analysis is used for determining the response of a structure. This paper presents results from a study on the effects of different types of spectrum-compatible excitations on the response of medium-height reinforced concrete frame buildings. Two six-storey buildings designed for Vancouver and a five-storey building designed for Montréal were used in the study. Nonlinear time-history analyses were conducted by subjecting the buildings to selected ensembles of spectrum-compatible excitations (i.e., accelerograms). The ensembles used in the study included spectrum-compatible artificial accelerograms, simulated stochastic accelerograms, and recorded earthquake accelerograms (i.e., real accelerograms) scaled to the design spectrum ordinate at the fundamental building period and to the area under the design spectrum within the predominant period range of the building. The responses of the buildings resulting from spectrum-compatible artificial accelerograms and those from scaled real accelerograms were found to be quite similar. Based on the results of this study, the scaling of real accelerograms to spectral area is preferred for obtaining spectrum-compatible accelerograms.Key words: seismic, excitation, response, spectrum, accelerogram, building, drift, curvature, ductility.

Selection of seismic excitations for nonlinear analysis of reinforced concrete frame buildings

2013 ◽  
Vol 40 (5) ◽  
pp. 411-426 ◽  
Author(s):  
Lan Lin ◽  
Nove Naumoski ◽  
Murat Saatcioglu ◽  
Simon Foo ◽  
Edmund Booth ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Nonlinear Analysis ◽  
Time History ◽  
Time History Analysis ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
History Analysis ◽  
Acceleration Time Histories ◽  
Frame Buildings ◽  
Selection Of

The selection of seismic motions is one of the most important issues for the time-history analysis of buildings. This paper discusses four different methods for obtaining spectrum-compatible acceleration time histories (i.e., accelerograms) of seismic motions. Based on these methods, four sets of accelerograms compatible with the design spectrum for Vancouver were selected for this study. These included (i) scaled real accelerograms, (ii) modified real accelerograms, (iii) simulated accelerograms, and (iv) artificial accelerograms. The selected sets were used as excitation motions in the nonlinear analysis of three reinforced concrete frame buildings designed for Vancouver. The buildings included a 4-storey, a 10-storey, and a 16-storey building, which can be considered representative of low-rise, medium-rise, and high-rise buildings, respectively. The storey shears, interstorey drifts, and curvature ductilities for beams and columns obtained from the analysis were used for the evaluation of the effects of the selected sets on the responses of the buildings. Based on the results from the analysis, scaled real accelerograms are recommended for use in time-history analysis of reinforced concrete frame buildings.

scholarly journals Seismic behavior and retrofitting of reinforced concrete moment resistant frames

2021 ◽  
Author(s):  
Shahram Talebi
Keyword(s):  
Reinforced Concrete ◽  
Linear Time ◽  
Time History ◽  
Fiber Reinforced Polymers ◽  
Frame Structures ◽  
Reinforced Concrete Frame ◽  
Damage Potential ◽  
Concrete Frame ◽  
Seismic Zones ◽  
Reinforced Concrete Frame Structures

Many multistory reinforced concrete frame structures built prior to 1970's located in seismic zones have been designed only for gravity loads without any considerations for lateral loads. These structures are referred to as Gravity Load Designed (GLD) frames. The lack of seismic considerations in GLD structures results in non-ductile behavior that may cause the lateral load resistance of these buildings to be insufficient for even moderate earthquakes. Based on the current Canadian practice as prescribed by CAN3-A23.3 1994, reinforced concrete structures located in seismic zones should be designed as ductile or nominally ductile frames. In this study, a typical 5-story frame building is designed as (a) ductile, (b) nominally ductile and (c) GLD frame. Analytical investigation is performed to evaluate and to compare the performance of each frame. The study includes "pushover" analysis and non-linear time-history analysis. The results in terms of story displacement, ductility, shear, drift, sequence of cracking and yielding and the damage potential are presented. As a result of the poor performance of the GLD frame, it is retrofitted with fiber-reinforced polymers (FRP). Different retrofitting schemes using FRP are used to compare the behavior in terms of ductility. In this study, the behavior of the retrofitted frame is compared with the that of the GLD frame. Based on the results of this study, a guideline for improving the seismic performance of reinforced concrete frame structures is provided.

Performance Based Rapid Seismic Assessment Method (PERA) for Reinforced Concrete Frame Buildings

2014 ◽  
Vol 17 (3) ◽  
pp. 439-459 ◽  
Author(s):  
A. Ilki ◽  
M. Comert ◽  
C. Demir ◽  
K. Orakcal ◽  
D. Ulugtekin ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Assessment Method ◽  
Seismic Assessment ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Frame Buildings

Research on the Collapse Performance of RC Frame Structure

2014 ◽  
Vol 556-562 ◽  
pp. 712-715
Author(s):  
Jing Zhao ◽  
Jing Zhao ◽  
Xing Wang Liu
Keyword(s):  
Reinforced Concrete ◽  
Frame Structure ◽  
Rc Frame ◽  
Hydraulic Actuator ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Load Paths ◽  
Rc Frame Structure ◽  
Gravity Load ◽  
Middle Column

In collapse-resistant design of a structure under accidental local action, it is important to understand the failure mechanism and alternative load paths. In this paper, a pseudo-static experimental method is proposed. Based on which, the collapse of frame structure was simulated with testing a 1/3 scale; 4-bay and 3-story plane reinforced concrete frame. In the experience, the middle column of the bottom floor was replaced by mechanical jacks to simulate its failure, and the simulated superstructure’s gravity load acted on the column of the top floor by adopting a servo-hydraulic actuator with force –controlled mode.

Sign in / Sign up

Export Citation Format

Share Document