Non-Ductile RC Frames and Alternative Improved Construction Technologies

Abstract eng:
This paper provides an overview of the challenges related to the design and construction of reinforced concrete (RC) frame buildings in areas of high seismic risk, and discusses alternative improved construction technologies and related educational initiatives. RC frame construction is frequently used in regions of high seismic risk across the world. Recent earthquakes have revealed major seismic deficiencies in these buildings, some of which led to catastrophic collapses and significant death tolls. Causes for the unsatisfactory performance include the absence of special seismic detailing of key structural elements, inadequate material and construction quality, and/or inadequate design. The problem is aggravated further by the use of unreinforced masonry infill walls that significantly affect the way in which the building responds to earthquake ground shaking. The authors propose two alternative building technologies characterized by a higher level of seismic safety at a comparable cost and construction complexity. One alternative is to provide RC shear walls continuously along the building height at several strategic locations; this will result in an increased stiffness and lateral drift control. Another alternative is to use confined masonry construction, in which lateral load resistance relies on masonry walls “confined” by horizontal and vertical RC elements. Confined masonry construction requires a lower level of design expertise and construction skills. Recent international initiatives focused on educating both technical and non-technical audiences on the challenges associated with seismic performance of RC frame construction and alternative building technologies are also discussed in the paper.

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