Time-History Analysis of Reinforced Concrete Frame Buildings with Soft Storeys

2016 ◽  
Vol 42 (3) ◽  
pp. 1201-1217 ◽  
Author(s):  
Sayed Mahmoud ◽  
Magdy Genidy ◽  
Hesham Tahoon
Keyword(s):  
Reinforced Concrete ◽  
Time History ◽  
Time History Analysis ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
History Analysis ◽  
Frame Buildings

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.

Seismic Performance Analysis of Steel Reinforced Concrete Frame-Concrete Core Wall Structure

2011 ◽  
Vol 243-249 ◽  
pp. 740-745 ◽  
Author(s):  
Qing Ning Li ◽  
Qing Mei Liu ◽  
Lin Zhao
Keyword(s):  
Reinforced Concrete ◽  
Time History ◽  
Wall Structure ◽  
Reinforced Concrete Frame ◽  
Concrete Core ◽  
Steel Reinforced Concrete ◽  
Concrete Frame ◽  
High Rise ◽  
History Analysis ◽  
Rare Earthquake

A steel reinforced concrete frame-concrete core wall structure is taken as the research object in this paper. The whole space finite element models are established by software ETABS, modal analysis, response spectrum method and elastic time-history analysis are conducted. And static elastio-plastic time history analysis of the high-rise structure is conducted by software MIDAS/GEN. Seismic response of the high-rise structure is analyzed under medium earthquake and rare earthquake , elastic deformation is calculated under conventional earthquake and elastic-plastic deformation is calculated under rare earthquake. The results show that the structure can meet the requirements of no-damage under light earthquake, repairable under medium earthquake and no-collapse under strong earthquake.

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 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.

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.

Response of irregular lightly reinforced concrete frame structures in low seismic zones

2016 ◽  
Vol 20 (4) ◽  
pp. 519-533
Author(s):  
Arash Rezavandi ◽  
Chung C Fu
Keyword(s):  
Reinforced Concrete ◽  
Plastic Hinge ◽  
Time History ◽  
Seismic Intensity ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
Reinforced Concrete Frame ◽  
Seismic Zones ◽  
History Analysis ◽  
Lightly Reinforced Concrete

This article evaluates the performance of lightly reinforced concrete frames in low seismic zones. The frames under evaluation contain vertical and/or plane irregularities and are designed for gravity loads only. Nonlinear time history analysis using scaled ground motions and pushover procedure as a supplemental method is performed in this study. With the adoption of plastic hinge method, damage levels are addressed according to FEMA 356 definitions. The pivot model is considered for hysteresis behavior. The damage stage and number of formed hinges are classified for the beams and columns. A comparison between models demonstrates while the first story height may suffer minor to moderate damage levels even under low seismic intensity, the severity of damage to the asymmetric plan models can be noticeable. The pushover method results are close to that of time history analysis only for the vertical irregular frames without plane irregularity.

scholarly journals An Analytical Study of Flat Slab and Convention Slab with Framed Tube System by Performing Time History Analysis

2021 ◽  
Vol 9 (9) ◽  
pp. 2133-2140
Author(s):  
Mohammed Mohsin
Keyword(s):  
Time History ◽  
Time History Analysis ◽  
Seismic Zone ◽  
Base Shear ◽  
Reinforced Concrete Frame ◽  
Flat Slab ◽  
Concrete Frame ◽  
High Rise ◽  
High Rise Building ◽  
History Analysis

Abstract: To study seismic demand for regular reinforced concrete frame of flat slab with drop and conventional slab structure by using framed tube structural system by performing time history analysis. The performance of these slabs on 30 storey building will be studied for the analysis, seismic zone (v) will be considered. It is a type of linear dynamic analysis, in which the strength of the structure is tested within the elastic limit of the structure. In this project, high rise building of 30 of area 1296sq.m along with framed tube subjected to earthquake loading are analysed by time history analysis using ETABS software. The dynamic parameters such as base shear, story displacements, and story drift and time period of flat slab building with framed tube is being studied and compared to conventional slab. Keywords: High-rise building, Framed tube, Time history analysis

Application of Buckling-Restrained Braces in Prefabricated Reinforced Concrete Frame

2013 ◽  
Vol 351-352 ◽  
pp. 1527-1531
Author(s):  
Hong Nan Wang ◽  
Hua Bo Liu ◽  
Jian Feng Wang
Keyword(s):  
Reinforced Concrete ◽  
Time History ◽  
Lateral Force ◽  
Original Structure ◽  
Design Code ◽  
Reinforced Concrete Frame ◽  
Seismic Excitations ◽  
Concrete Frame ◽  
History Analysis ◽  
Present Design

The old prefabricated reinforced concrete buildings have been designed with old standards that are lower than the present design code provisions. These buildings are likely to be vulnerable to severe damage or total collapse under strong seismic excitations. Hence, it is necessary to evaluate these buildings seismic performance and to retrofit them using appropriate methods. Buckling-restrained brace (BRB) is a kind of prospective energy dissipation component. As a brace, it is also a lateral force resistant member. Based on the characteristics of prefabricated frame and BRB, the time history analysis of a prefabricated frame strengthening by BRB is carried out by using software ANSYS to input the seismic wave. Then, the seismic behavior of this kind of frame is studied. It is observed that the seismic response of the retrofitted structures reduces significantly in comparison with the corresponding original structure without any retrofit measures.

Performance-Based Pushover Analysis for Reinforced Concrete Frame

2011 ◽  
Vol 255-260 ◽  
pp. 2426-2433
Author(s):  
Hui Zhi Zhang ◽  
Xiu Qin Cui
Keyword(s):  
Reinforced Concrete ◽  
Plastic Hinge ◽  
Pushover Analysis ◽  
Time History ◽  
Bending Moment ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
History Analysis ◽  
Hinge Bending ◽  
Stable Result

For more reasonable and convenient evaluating structure seismic performance,static elasto-plastic analysis of reinforced concrete frame is presented by pushover with different lateral load distributing modes including uniform distribution, inverted triangle distribution and self-adaption distribution adopted, custom plastic hinge, bending moment-curvity relation and bending moment-axial force correlation of each member section are acquired by Response2000, and time history analysis is used to reinforced concrete frame. It is revealed that the presented method is easy and feasiable, and can generatee stable result.

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