APPLICATION OF SHAPE MEMORY ALLOYS IN THE SEISMIC RETROFITTING OF BRIDGE COLUMNS
This analytical study focuses on investigating a new active confinement retrofitting technique for reinforced concrete bridge columns using pre-strained shape memory alloy (SMA) hoops. The shape memory feature of SMAs is sought in this study to apply large lateral confining pressure on the columns in an easy and reliable technique. A finite element model is developed for a column adopted from the literature and retrofitted with SMA hoops and CFRP wraps. The compression stress-strain behaviors of passively and actively confined concrete using CFRP wraps and SMA hoops, respectively are implemented in the finite element model. The retrofitted column behavior is studied under displacement-controlled and seismic excitations. The results of the cyclic loading analysis indicates an increase in the SMA retrofitted column strength by approximately 34% compared to that of the CFRP retrofitted column. The seismic analysis results show that the early increase in the concrete strength associated with using SMA hoops results in a maximum and residual drift reduction of approximately 12% and 50%, respectively compared to the drifts obtained by using conventional CFRP wraps.
Shape memory alloys Seismic retrofitting Bridges Concrete Confinement
M. Shin B. Andrawes
Graduate Research Assistant, Dept. of Civil and Environmental Engineering, University of Illinois at Assistant Professor, Dept. of Civil and Environmental Engineering, University of Illinois at Urbana-
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）