000019447 001__ 19447
000019447 005__ 20170118182319.0
000019447 04107 $$aeng
000019447 046__ $$k2017-01-09
000019447 100__ $$aKishiki, Shoichi
000019447 24500 $$aPost-Earthquake Quick Damage Evaluation Based on Crack on the Concrete Foundation of Exposed Column Base

000019447 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019447 260__ $$b
000019447 506__ $$arestricted
000019447 520__ $$2eng$$aFrom lessons learned in the 2011 Tohoku earthquake, it becomes clear that the quick procurement of an emergent public shelter is very important in time of disaster. Structural engineers are required to estimate the seismic damage of structural components in buildings, and to judge whether these are able to be occupied or not. However, the visible damage can hardly be related with the damage to steel structural components, while crack width has been used as a clear damage index for reinforced concrete structures. It is very important to establish a visible damage index for quick damage estimation of steel structures. In the reconnaissance of the 2011 Tohoku earthquake, many cracks on the concrete foundation around exposed steel column base were observed. From the detailed investigations, it is pointed out that the crack width is strongly related with the seismic damage to the framing components covered by non-structural components. In the present paper, cyclic loading tests focusing on crack patterns and its width of concrete foundation were conducted to confirm the relationship between structural performances and the visible damage indices. The test specimen is a single span full scaled frame subassembly composing of a beam, a column, a brace, and an exposed column base with concrete foundation. All cracks on the concrete foundation are classified into the 2 major categories, that is, the cracks between concrete foundation and cover mortar, and those diagonally growing from anchor bolts in the compressive side to foundation beam. The cracks in the first category are a result of the column-base rotation together with the cover mortar. Therefore, on the assumption that the rotation center is located on the column flange in compression, the relationship between the crack width and column-base rotation is obtained. Meanwhile, because the residual crack width is roughly 90% of the maximum crack width after anchor bolts yielding, the maximum column base rotation can be estimated by measuring the residual crack width. The maximum story drift angle can in turn be estimated, since the column-base rotation constitutes most of the story drift ratio after the anchor bolts yield. The cracks in the second category can be attributed to the concrete edge failure due to shear forces on the column base. It was observed that the crack width is about half of the lateral deformation at the column base. Therefore, lateral deformation at the column base due to the concrete edge failure can be estimated by the width of the diagonal crack from anchor bolts in compression to foundation beam.

000019447 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019447 653__ $$aexposed column base, concrete foundation, damage evaluation, crack width, cyclic loading test

000019447 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019447 720__ $$aKishiki, Shoichi$$iYamada, Satoshi
000019447 8560_ $$ffischerc@itam.cas.cz
000019447 8564_ $$s621557$$uhttps://invenio.itam.cas.cz/record/19447/files/3640.pdf$$yOriginal version of the author's contribution as presented on USB, paper 3640.
000019447 962__ $$r16048
000019447 980__ $$aPAPER