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Linear motion guide(LMG)and tension springs for base isolation of building models-Seismic performance assessment 认领 引用
1
作者 Azeem M Sajith AS Indira PV 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2026年第3期793-808,共16页
The present study puts forth a proposal that combines a linear motion guide with tension springs to establish a base isolation system for carrying out laboratory experiments.The methodology involves experimental analy... The present study puts forth a proposal that combines a linear motion guide with tension springs to establish a base isolation system for carrying out laboratory experiments.The methodology involves experimental analysis using a small-scale model of a single-story structure with both fixed base and base isolated configurations.The isolation systems compared include a linear motion guide with tension springs(BI-LMG)and a conventional laminated rubber bearing(BILRB).Free vibration tests showed the time-period shift and enhanced damping in the new isolation method proposed.In addition,the performance of the base isolation system was evaluated through sinusoidal and seismic time-history analyses employing a variety of earthquake data to determine its ability to withstand seismic excitations. 展开更多
关键词 base isolation laboratory experiments linear motion guide tension springs laminated rubber bearing
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Study on seismic performance enhancement in bridges based on factorial analysis 认领 引用 被引量：2
2
作者 Abey ET Somasundaran TP Sajith AS 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2017年第1期181-198,共18页
The seismic performance of bridges depends on the ductile behavior of its column, as the deck and other substructural components except pile foundations are normally designed to be elastic to facilitate bridge retrofi... The seismic performance of bridges depends on the ductile behavior of its column, as the deck and other substructural components except pile foundations are normally designed to be elastic to facilitate bridge retrofitting. Codes such as AASHTO, Caltrans, IRC： 112 etc. give guidelines for the seismic performance enhancement of columns through ductile detailing. In the present study, a methodology for the seismic performance enhancement of bridges is discussed by using a ＂Parameter-Based Influence Factor＂ （PIF） developed from factorial analysis. The parameters considered in the factorial analysis are： percentage of longitudinal reinforcement （Pt）, compressive strength of concrete （f＇c）, yield strength of steel （fy）, spacing of lateral ties （5） and column height （/4）. The influence of each parameter and their combination on the limit states considered is estimated. Pushover analysis is used to evaluate the capacity of columns, considering shear failure criteria. A total of 243 （35 combinations） analysis results are compiled to develop ＇PIF＇ used in the performance enhancement process. The study also encompasses other sub-objectives such as evaluating the discrepancies in using the Importance Factor （/） in designing bridges of varied functional importance; and estimating the aspect ratio and slenderness ratio values of bridge columns for its initial sizing. 展开更多
关键词 bridge retrofitting column capacity factorial analysis performance enhancement seismic performance
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