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- W598651206 abstract "Evidence from the damage caused by the 1989 San Francisco earthquake is analysed to provide data for future designs. Some of the worst effects were felt in areas of poor subsoil, where weak silts and land fill sites can cause both horizontal and vertical ground decelerations to be amplified. The Nimitz Freeway is a double-decker highway where in-situ concrete decks were supported by cross beams and columns on foundations piled through weak silts. Collapse of the upper deck was probably initiated by shear cracking at the column/beam intersections but the deck remained intact. Dynamic analysis of the effects of predicted ground accelerations caused by earthquakes shows that shears and axial forces alternate in any direction during the cycle. Such stress reversals lead to the cracking of concrete sections and progressive weakening of the sections. The ability to absorb increasing strain at constant stress levels is easier to achieve with steel frames than with reinforced concrete, but by appropriate detailing, this capacity can be provided in concrete frames. Main reinforcements in beams and columns must be by extensive arrangements of links to resist bond failure and ensure the longitudinal bars can continue to act. Continuity at junctions is critical, and the use of pins should be avoided." @default.
- W598651206 created "2016-06-24" @default.
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- W598651206 date "1990-01-02" @default.
- W598651206 modified "2023-09-26" @default.
- W598651206 title "BRIDGE DESIGN IN AN EARTHQUAKE ZONE" @default.
- W598651206 hasPublicationYear "1990" @default.
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