NEHRP Clearinghouse

Infilled Frames in Earthquake-Resistant Construction.
Klingner, R. E.; Bertero, V. V.
National Science Foundation, Washington, D.C., December 1976, 292 p.
Identifying Number(s)
The effects of engineered masonry infill panels on the seismic hysteretic behavior of reinforced concrete frames are investigated experimentally and analytically. The experimental phase consists of quasi-static cyclic load tests on a series of one-third-scale model subassemblages of the lower three stories of an eleven-story, three-bay frame with infills in the two outer bays. Emphasis is placed on simulating the proper force and displacement boundary conditions. The engineered infilled frames are designed and constructed in accordance with the following guidelines: (1) Frame members (particularly the columns) are designed for high rotational ductility and resistance to degradation under reversed cyclic shear loads; (2) Gradual panel degradation is achieved by using closely-spaced infill reinforcement; and (3) Panel thickness is limited so that the infill cracking load is less than the available column shear resistance. The infilled frames are found to offer many advantages over comparable bare frames, particularly, with respect to their performance under strong ground motions.
ANSRI computer program; Grout; Earthquake resistant structures; Reinforced concrete; Framed structures; Columns (Supports); Computer programs; Earthquake engineering; Shear stress; Cyclic loads; Infilled frames; Concrete construction