NEHRP Clearinghouse
- Title
- Optimum Inelastic Design of Seismic-Resistant Reinforced Concrete Frame Structures.
- File
- PB80164635.pdf
- Author(s)
- Zagajeski, S. W.; Bertero, V. V.
- Source
- National Science Foundation, Washington, DC., January 1980, 122 p.
- Identifying Number(s)
- UCB/EERC-80/03
- Abstract
- The design of seismic-resistant reinforced concrete, moment-resisting frame structures is discussed and an inelastic optimum design procedure is described. This procedure is based on the philosophy of comprehensive design and employs a computer aided iterative technique in a series of five steps. Each step contains two phases, in each of which a weak-girder, strong column design criteria is imposed. The discussion of the proposed inelastic design procedure concentrates on the preliminary design phase which comprises three steps--preliminary analysis, preliminary design, and analysis of the preliminary design. Seismic design story shears are found by a spectral modal analysis technique which includes an approximation to the P-delta effect. A nonlinear optimization technique (the cutting-plane method) is employed at each story to find the beam design moment capacities which minimize a function proportional to the volume of flexural reinforcement. Design constraints are imposed to ensure that a safe, serviceable, and practical design results. Actual member design is found employing computer design aids. In the final step, the preliminary design is analyzed to evaluate its acceptability. Acceptability is determined by comparing the results of a series of linear elastic and nonlinear analyses with established design criteria and assumptions made in formulating the design problem.
- Keywords
- Seismic design; Earthquake resistant structures; Framed structures; Reinforced concrete; Elastic analysis; Ground motion; Earthquake engineering; Nonlinear programming; Computer aided design; Concrete construction; Design criteria