A Study Into Effects of Plate Stiffeners on the Retrofitted Deep RC Coupling Beams


Abstract eng:
Existing deep reinforced concrete (RC) coupling beams with low shear span ratios and conventionally reinforced shear stirrups tend to fail in a brittle manner with limited ductility and deformability under reversed cyclic loading. Previous studies have developed a new retrofitting method with stiffened laterally restrained steel plate (LRSP) for existing deep RC coupling beams. The additional stiffeners can prevent plate buckling and ensure that the steel plate has a wider yield area and hence the retrofitted coupling beams could achieve a higher energy dissipation capability. However, according to experimental study, it can be found that too much stiffening would lead to a loss of deformability of the retrofitted coupling beams. In this paper, by using finite element analysis program MSC.Marc, plate stiffeners with different arrangement were adopted in order to study the effect of stiffeners on the performances of the retrofitted coupling beams. The numerical results revealed that by adding more stiffeners on steel plate, the shear capacity of the retrofitted coupling beam could be increased slightly. And the stiffeners set passing the center point of steel plate could effectively restrain plate buckling. Moreover, stiffeners set passing the plate center point of steel plate and diagonally stiffeners could better control the cracking of concrete and the failure modes are more ductile. These two kinds of arrangement are more preferable for enhancing the seismic performances of the retrofitted deep coupling beams.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 1212.:
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