Effects of column and superstructure stiffness on the seismic response of bridges in the transverse direction

2013 ◽  
Vol 40 (8) ◽  
pp. 827-839 ◽  
Author(s):  
Payam Tehrani ◽  
Denis Mitchell
Keyword(s):  
Seismic Response ◽  
Nonlinear Dynamic ◽  
Transverse Direction ◽  
Time History ◽  
Highway Bridge ◽  
Design Code ◽  
Bridge Design ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses ◽  
Degree Of Irregularity

The transverse seismic responses of continuous 4-span bridges designed based on the 2006 Canadian Highway Bridge Design Code were studied using inelastic time history analyses. A total of 648 bridge configurations were considered in which the column heights, column diameters, superstructure stiffness and mass as well as abutment restraint conditions were studied. The maximum ductility demands obtained using elastic and inelastic analyses were compared to study the influence of the degree of irregularity. The effects of column stiffness ratios and superstructure to substructure stiffness ratios on the maximum ductility demands and concentration of ductility demands were investigated. A number of different regularity indices were compared to determine the suitability of these different indices in predicting the influence of irregularity. This study demonstrates the conservative nature of the 2006 Canadian Highway Bridge Design Code and provides some guidance on factors for determining the degree of irregularity and suitable regularity indices when carrying out nonlinear dynamic analyses of bridges.

Numerical Investigations on the Seismic Response of Masonry Building Aggregates

2010 ◽  
Vol 133-134 ◽  
pp. 715-720 ◽  
Author(s):  
Ilaria Senaldi ◽  
Guido Magenes ◽  
Andrea Penna
Keyword(s):  
Seismic Response ◽  
Nonlinear Dynamic ◽  
Masonry Building ◽  
Structural Units ◽  
Numerical Investigations ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses ◽  
Building Aggregates

The work focuses on the analysis of the seismic response of masonry building aggregates for a better understanding of the vulnerability of single structural units and of their behaviour within the aggregates. Idealized representative models are developed based on the typical characteristics of the row conglomeration typology. The seismic response of the models is evaluated and discussed by means of nonlinear dynamic analyses.

Effects of column stiffness irregularity on the seismic response of bridges in the longitudinal direction

2013 ◽  
Vol 40 (8) ◽  
pp. 815-825 ◽  
Author(s):  
Payam Tehrani ◽  
Denis Mitchell
Keyword(s):  
Seismic Response ◽  
Response Spectrum ◽  
Time History ◽  
Longitudinal Direction ◽  
Elastic Response ◽  
Highway Bridge ◽  
Stiffness Ratio ◽  
Design Code ◽  
Nonlinear Analyses ◽  
Inelastic Analysis

The longitudinal seismic responses of 4-span continuous bridges designed based on the 2006 Canadian Highway Bridge Design Code were studied using elastic response spectrum and inelastic time-history analyses. Several boundary conditions including unrestrained horizontal movements at the abutments and different abutment stiffnesses were considered in the nonlinear analyses. The seismic response of more than 2600 bridges were studied to determine the effects of different design and modelling parameters including the effects of different column heights, column diameters, and superstructure mass as well as different abutment stiffnesses. The bridges were designed using two different force modification factors of 3 and 5. The effects of column stiffness ratios on the elastic and inelastic analysis results, maximum ductility demands, concentration of ductility demands, and demand to capacity ratios were investigated. The results indicate that the seismic response and maximum ductility demands in the longitudinal direction are influenced by important parameters such as the total stiffness of the substructure, the column stiffness ratio, and the aspect ratio of the columns.

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.

Evaluation of the seismic response coefficient introduced in the Canadian Highway Bridge Design Code

2000 ◽  
Vol 27 (6) ◽  
pp. 1183-1191 ◽  
Author(s):  
Nove Naumoski ◽  
M S Cheung ◽  
S Foo
Keyword(s):  
Seismic Hazard ◽  
Seismic Response ◽  
Subduction Zone ◽  
Cascadia Subduction Zone ◽  
Highway Bridge ◽  
Design Code ◽  
Bridge Design ◽  
Strong Earthquakes ◽  
Response Coefficient ◽  
Scenario Earthquakes

This paper describes results from an evaluation study of the elastic seismic response coefficient introduced in the Canadian Highway Bridge Design Code. The evaluation is conducted by comparing the seismic response coefficient with (i) uniform hazard spectra for selected cities in eastern and western Canada, (ii) spectra of numerically simulated ground motions for sites in British Columbia for scenario earthquakes on the Cascadia subduction zone, (iii) spectra of the 1988 Saguenay, Quebec, earthquake records and selected ensembles of recorded accelerograms from strong earthquakes around the world, and (iv) bridge design spectra of other countries. The results from this study show that the seismic response coefficient of the Canadian Highway Bridge Design Code is conservative in terms of the Canadian seismic hazard, with the exception of (i) sites close to the Cascadia subduction zone and (ii) sites for which the seismic hazard is governed by the effects of strong earthquakes at large epicentral distances. Key words: seismic, response, coefficient, acceleration, spectra, bridge, design, code.

scholarly journals Seismic performance comparison between force-based and performance-based design as per Canadian Highway Bridge Design Code (CHBDC) 2014

2016 ◽  
Vol 43 (8) ◽  
pp. 741-748 ◽  
Author(s):  
Qi Zhang ◽  
M. Shahria Alam ◽  
Saqib Khan ◽  
Jianping Jiang
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Performance Based Design ◽  
Performance Criteria ◽  
Highway Bridge ◽  
Reinforcing Steel ◽  
Earthquake Hazards ◽  
Design Code ◽  
Bridge Design ◽  
The Impact

Performance-based design (PBD) was first introduced in Canadian Highway Bridge Design Code (CHBDC) in 2014. Performance-based design is the design that meets multiple performance criteria under different earthquake hazards. To investigate the impact of changes in CHBDC 2014, a four-span concrete highway bridge is designed and evaluated using force-based design (FBD) and PBD methods as per CHBDC 2014, and FBD method as per CHBDC 2006. By incorporating soil–structure interaction (using p–y curves) nonlinear pushover and dynamic time history analyses are conducted to assess the seismic performance of these bridges. Maximum strains of concrete and reinforcing steel are compared among the three designs to determine their performance levels. It is concluded that PBD (CHBDC 2014) is highly conservative compared to FBD (for both CHBDC 2014 and 2006). For the three-level PBD approach, the design is governed by the criterion of reinforcing steel not yielding under the design earthquake (with 475 years return period).

Nonlinear Dynamic Analysis of the Damping Frame Structure System

2012 ◽  
Vol 594-597 ◽  
pp. 886-890 ◽  
Author(s):  
Gan Hong ◽  
Mei Li ◽  
Yi Zhen Yang
Keyword(s):  
Energy Dissipation ◽  
Seismic Response ◽  
Nonlinear Dynamic ◽  
Time History ◽  
Time History Analysis ◽  
Frame Structure ◽  
Force Model ◽  
Operating Characteristics ◽  
Restoring Force ◽  
History Analysis

Abstract. In the paper, take full account of energy dissipation operating characteristics. Interlayer shear-frame structure for the analysis of the Wilson-Θmethod ELASTOPLASTIC schedule, the design of a nonlinear dynamic time history analysis procedure. On this basis, taking into account the restoring force characteristics of the energy dissipation system, the inflection point in the restoring force model treatment, to avoid a result of the calculation results of distortion due to the iterative error. A frame structure seismic response time history analysis results show that: the framework of the energy dissipation significantly lower than the seismic response of the common framework, and its role in the earthquake when more significant.

Sign in / Sign up

Export Citation Format

Share Document