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Strengthening Methodology for Lightly Reinforced Concrete Frames-II. Recommended Calculation Techniques for the Design of Infill Walls.


pdf icon Strengthening Methodology for Lightly Reinforced Concrete Frames-II. Recommended Calculation Techniques for the Design of Infill Walls. (1756 K)
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

Keywords:

building technology; reinforced concretes; empirical equation; experimental; frames; infilled walls; shear stress; shear strength

Abstract:

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 frames.