Effect of High-Strength Concrete on Prestressed Frames

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Title: Effect of High-Strength Concrete on Prestressed Frames

Author(s): Y. L. MO and W. L. Hwang

Publication: Special Publication

Volume: 167

Issue:

Appears on pages(s): 311-328

Keywords: Ductility; energy dissipation; failure; high-strength concretes; hysteresis; prestressed concrete; prestress loss.

Date: 3/1/1997

Abstract:
Prestressed concrete frames are commonly used in bridge design. However, very little is known about their behavior under reversed cyclic loads, particularly when the frame is made of high strength prestressed concrete and is subjected to severe earthquakes. Most bridge codes do not provide the required design guidelines. Results from small scale models of eight prestressed concrete frames (divided into two groups), tested under various displacement histories simulating earthquake forces are presented. The primary curves (horizontal force-displacement relationships) and the hysteretic loops are determined experimentally. Concrete strength are 35 MPa and 52 MPa, for the two groups, respectively, and the effective prestress is 51 percent of the ultimate strength of prestressing steel. It is found that prestressed frames with high strength concrete provide greater ductility and dissipated energy than those with normal strength concrete. The effect of displacement history on the mechanical behavior is significant.