Verification of displacement-based adaptive pushover through multi-ground motion incremental dynamic analyses

2009 ◽  
Vol 31 (8) ◽  
pp. 1789-1799 ◽  
Author(s):  
Barbara Ferracuti ◽  
Rui Pinho ◽  
Marco Savoia ◽  
Roberto Francia
Keyword(s):  
Ground Motion ◽  
Dynamic Analyses ◽  
Displacement Based ◽  
Adaptive Pushover

Seismic Assessment and Retrofitting of an Under-Designed RC Frame Through a Displacement-Based Approach

2017 ◽  
pp. 36-58
Author(s):  
Marco Valente ◽  
Gabriele Milani
Keyword(s):  
Seismic Response ◽  
Numerical Models ◽  
Seismic Assessment ◽  
Original Structure ◽  
Rc Frame ◽  
Existing Structures ◽  
Dynamic Analyses ◽  
Non Linear ◽  
Displacement Based ◽  
Southern European Countries

Many existing reinforced concrete buildings were designed in Southern European countries before the introduction of modern seismic codes and thus they are potentially vulnerable to earthquakes. Consequently, simplified methodologies for the seismic assessment and retrofitting of existing structures are required. In this study, a displacement based procedure using non-linear static analyses is applied to a four-storey RC frame in order to obtain an initial estimation of the overall inadequacy of the original structure as well as the extent of different retrofitting interventions. Accurate numerical models are developed to reproduce the seismic response of the RC frame in the original configuration. The effectiveness of three different retrofitting solutions countering structural deficiencies of the RC frame is examined through the displacement based approach. Non-linear dynamic analyses are performed to assess and compare the seismic response of the frame in the original and retrofitted configurations.

Three-dimensional dynamic analyses of two Colombian high-rise buildings

1969 ◽  
Vol 59 (4) ◽  
pp. 1495-1515
Author(s):  
Gary C. Hart
Keyword(s):  
Ground Motion ◽  
Three Dimensional ◽  
Office Building ◽  
Mode Shapes ◽  
Concrete Frame ◽  
Building Model ◽  
High Rise ◽  
Building Models ◽  
Dynamic Analyses ◽  
Seismograph Station

Abstract The actual earthquake damage in two high-rise buildings in Bogota, Colombia, is compared with predicted response of four three-dimensional analytic building models. Three building models of the 24-story steel frame Bank of Bogota and one of the 29-story concrete frame Bavaria Office Building are considered. Periods and mode shapes are calculated for each building model. Maximum interstory displacements, absolute roof accelerations, story shears, and torques are calculated in each building model for three well-recorded earthquakes, one being a July 1967 earthquake in Colombia, as recorded at a nearby Bogota seismograph station. In all earthquakes, both components of ground motion were applied simultaneously.

Ground Motion Selection for Liquefaction Evaluation Analysis of Earthen Levees

2012 ◽  
Vol 28 (4) ◽  
pp. 1331-1351 ◽  
Author(s):  
Adda Athanasopoulos-Zekkos ◽  
Mustafa Saadi
Keyword(s):  
Ground Motion ◽  
Cross Sections ◽  
Ground Motions ◽  
Cyclic Stress ◽  
Cyclic Stress Ratio ◽  
Ground Motion Selection ◽  
Liquefaction Susceptibility ◽  
Wide Range ◽  
Dynamic Analyses ◽  
The Mean

Guidelines for selecting ground motions for liquefaction evaluation analysis of earthen levees are proposed. These guidelines were developed based on results from dynamic analyses of characteristic earthen levee cross sections using a wide range of ground motions (~1,500). The effect of a number of ground motion parameters on the dynamic response of the levees in terms of liquefaction susceptibility was studied, and the parameters that correlated best to the response were identified. For the liquefaction triggering evaluation, the mean period of the ground motion ( Tm) is best correlated to the cyclic stress ratio (CSR). Regression relationships between CSR and Tm are proposed for a series of levee types and shaking intensities.

Inelastic Seismic Response of Extended Pile-Shaft-Supported Bridge Structures

2004 ◽  
Vol 20 (4) ◽  
pp. 1057-1080 ◽  
Author(s):  
T. C. Hutchinson ◽  
Y. H. Chai ◽  
R. W. Boulanger ◽  
I. M. Idriss
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Performance Measures ◽  
Soil Profile ◽  
Site Response ◽  
Free Field ◽  
Winkler Foundation ◽  
Dynamic Analyses ◽  
Inelastic Seismic Response ◽  
Motion Characteristics

Nonlinear static and dynamic analyses were used to evaluate the inelastic seismic response of bridge and viaduct structures supported on extended cast-in-drilled-hole (CIDH) pile shafts. The nonlinear dynamic analyses used a beam-on-nonlinear-Winkler foundation (BNWF) framework to model the soil-pile interaction, nonlinear fiber beam-column elements to model the reinforced concrete sections, and one-dimensional site response analyses for the free-field soil profile response. The study included consideration of ground motion characteristics, site response, lateral soil resistance, structural parameters, geometric nonlinearity (P-Δ effects), and performance measures. Results described herein focus on how the ground motion characteristics and variations in structural configurations affect the performance measures important for evaluating the inelastic seismic response of these structures. Presented results focus on a representative dense soil profile and thus are not widely applicable to dramatically different soil sites.

Study on Ground Motion Intensities and Modification for Seismic Analysis of Reinforced Concrete Frames

2014 ◽  
Vol 1065-1069 ◽  
pp. 1438-1442
Author(s):  
Dong An ◽  
Tie Jun Qu
Keyword(s):  
Reinforced Concrete ◽  
Ground Motion ◽  
Nonlinear Dynamic ◽  
Seismic Analysis ◽  
Reinforced Concrete Buildings ◽  
Intensity Measure ◽  
Concrete Buildings ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses ◽  
Spectrum Matching

The selection of input ground motion for seismic analysis of the structure is a complicated task, especially when nonlinear dynamic analysis is utilized. A decision has to be made regarding the intensity measure better to represent the potential damage of the ground motion. This paper presents a lot of analysis to deal with the problem. A set of nonlinear dynamic analyses were conducted on reinforced concrete buildings widely present in China. Input ground motions contain uncertainty and variability comes from both natural recordings and synthetic data. First, a set of natural recordings is considered. Second, two ground motion modification schemes are used in this study: magnitude scaling and spectrum matching. Third, a set of ground motion is synthesized. The peak value of displacement has been selected as the response parameter better able to represent the structural damage level. Nonlinear dynamic analyses of reinforced concrete buildings simulated by OpenSEES are carried out to evaluate the correlation coefficients of displacement response and the chosen ground motion parameters. Findings from the investigation indicate that the Housner intensity is the more effective intensity measure for selecting the seismic input. The synthesized ground motion fit with code spectrum shows good performance as a design input motion. Considering ground motion modification, spectrum matching is generally more stable in response prediction than scaling.

The Influence of Modified Natural Records on Seismic Response of Reinforced Concrete Structure

2014 ◽  
Vol 711 ◽  
pp. 477-480
Author(s):  
Dong An ◽  
Tie Jun Qu
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Ground Motion ◽  
Nonlinear Dynamic ◽  
Reinforced Concrete Structure ◽  
Reinforced Concrete Frame ◽  
Magnitude Scaling ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses ◽  
Spectrum Matching

The choice of input ground motion in the evaluation of the seismic response is a complicated task. The ground motion parameters need to be determined by the scope of the analysis and the potential damage of new or existing buildings. This work presents nonlinear dynamic analyses on reinforced concrete frame widely present in China. Input ground motions contain uncertainty and variability comes from both natural recordings and modified ones. Magnitude scaling and spectrum matching are used in this study. Nonlinear dynamic analyses of reinforced concrete buildings simulated by SeismoStruct and OpenSEES are carried out to evaluate the seismic response. Findings from the investigation indicate that spectrum matching is generally stable and shows good performance in response prediction.

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