Strengthening Methodology for Lightly Reinforced Concrete Frames-II. Recommended Calculation Techniques for the Design of Infill Walls.
Strengthening Methodology for Lightly Reinforced
Concrete Frames-II. Recommended Calculation Techniques
for the Design of Infill Walls.
Phan, L. T.; Todd, D. R.; Lew, H. S.
NISTIR 5421; 44 p. May 1994.
Available from: National Technical Information Service
Order number: PB94-187648
building technology; reinforced concretes; empirical
equation; experimental; frames; infilled walls; shear
stress; shear strength
Empirical equations were developed for estimations of
ultimate lateral shear strength, story drift ratio at
ultimate load, and ductility factor of existing lightly
reinforced concrete frames (bare frames), existing
monolithic shear walls, and reinforced concrete frames
strengthened either by cast-in-place infilled walls or
by single or multiple precast concrete panels. These
equations were derived based on experimental results of
many independently conducted test programs. Estimations
of the ultimate shear stress, ultimate story drift ratio
(story drift at ultimate load divided by story height),
and ductility factor using the empirical equations
compared favorably with the experimental results. The
estimations confirm many observations made independently
in individual test programs. The empirical expressions
also provide "benchmark" values or ranges for these
important parameters and thus provide a useful means for
quick estimations of seismic capacity of bare,
monolithic, and strengthened lightly reinforced concrete