000010901 001__ 10901
000010901 005__ 20141205155815.0
000010901 04107 $$aeng
000010901 046__ $$k2008-10-12
000010901 100__ $$aMassumi, Ali
000010901 24500 $$aStrengthening of Low Ductile Reinforced Concrete Frames Using Steel X-Bracings with Different Details

000010901 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000010901 260__ $$b
000010901 506__ $$arestricted
000010901 520__ $$2eng$$aMany existing reinforced concrete (RC) frame buildings located in seismic zones, designed according to the past seismic codes are often found to have inadequate lateral strength to withstand major earthquakes. In this paper, the use of steel bracings in concrete framed structures is experimentally presented. A series of tests conducted on eight, one bay-one story, with 1:2.5 scale RC model frames. The object of the tests was to determine the effectiveness of cross bracings with various details of bracing connections to the concrete frames, to increase the in-plane shear strength of the concrete frames. The braces connections in model frames were selected to represent most easy, quick and economical techniques to strengthen RC frames by steel cross bracing system. Hence, two frames were not strengthened (un-braced) and were used as control specimens and six others were strengthened by X-bracings, and with five details of connection between frames and bracings. The details were: (i) using bolts and nuts (in two ways for two frames); (ii) using steel jackets around the columns (in two ways for three frames); (iii) using embedded plates (for welding gusset plates) in frame corners before placing the concrete (for studying possible use of steel bracing system in new concrete frames). Model frames were tested under constant vertical and cyclic lateral loadings. The tests results indicate considerable increase in the lateral strength and/or displacement ductility of strengthened frames upon bracing details.

000010901 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000010901 653__ $$aStrengthening, Steel bracing, Retrofitting, RC frames

000010901 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000010901 720__ $$aMassumi, Ali$$iTasnimi, Abbas Ali
000010901 8560_ $$ffischerc@itam.cas.cz
000010901 8564_ $$s1065149$$uhttps://invenio.itam.cas.cz/record/10901/files/12-01-0047.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 12-01-0047.
000010901 962__ $$r9324
000010901 980__ $$aPAPER