000018666 001__ 18666
000018666 005__ 20170118182235.0
000018666 04107 $$aeng
000018666 046__ $$k2017-01-09
000018666 100__ $$aKobayashi, Katsumi
000018666 24500 $$aShear Capacity Evaluation of RC Footing Beams With Large Web-Opening for Maintenance Based on Stress Transfer Mechanism

000018666 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018666 260__ $$b
000018666 506__ $$arestricted
000018666 520__ $$2eng$$aIf the openings are made on the web of footing beams for the maintenance purpose, the shear capacity is reduced. The shear capacity design formula is absolutely needed for the seismic design. AIJ code [1] includes the evaluation of shear capacity around the web-opening. However, as it limits the opening’s diameter to less than 1/3 of the beam depth, the beam depth is sometimes determined by this limitation. Unnecessary large beam depth is not economical. Recently the footing beams with large web-opening of which diameter is more than 1/3 of the beam depth are experimentally discussed [2]-[7] and adopted in the structural design with aid of AIJ code [1]. The problems are that AIJ design formula [1] is an empirical equation and that it does not give the constant safety margin to the actual shear capacity. In this study, the shear force transfer mechanism around the web-opening was experimentally discussed, and the shear force transfer model was proposed. The diagonal bars form a truss structure and carry a part of shear force independently. The truss and arch mechanism of two stage beams upper and lower side of the opening carry the other part of shear force. The stirrups on the side of the opening balance with the strut of the arch mechanism. The shear capacity was successfully evaluated with the constant safety margin based on the proposed shear force transfer model.

000018666 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018666 653__ $$aRC beams with web-opening; Shear capacity; Stress transfer mechanism; Strut and tie model

000018666 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018666 720__ $$aKobayashi, Katsumi
000018666 8560_ $$ffischerc@itam.cas.cz
000018666 8564_ $$s975352$$uhttps://invenio.itam.cas.cz/record/18666/files/195.pdf$$yOriginal version of the author's contribution as presented on USB, paper 195.
000018666 962__ $$r16048
000018666 980__ $$aPAPER