By John A. Blume, Leo H. Corning, Nathan M. Newmark
Description: This landmark e-book is an entire consultant to the layout and detailing of strengthened concrete structures for seismic forces.
Abstract: The book is a whole advisor to layout of strengthened concrete structures for earthquake motions. It comprises functional details on earthquake flooring movement and its results, layout spectrum, reaction of multistory constructions to earthquakes, ideas of earthquake-resistant layout, seismic layout issues, code specifications, energy, ductility, and effort absorption. building and inspection of strengthened concrete construction subjected to earthquake floor motions is usually mentioned. program of earthquake resistant layout provisions is illustrated via research, layout, and detailing of a 24-story strengthened concrete development. desk of Contents 1. Earthquake floor movement and Its results 2. Earthquake reaction of Multi-Degree-of-Freedom structures three. rules of Earthquake-Resistant layout four. layout issues and Code specifications five. power, Ductility, and effort Absorption of bolstered Concrete participants 6. layout of strengthened Concrete Frames 7. layout of a 24-Story construction eight. development and Inspection Appendix A Elastic Modal research of a 24-Story construction Appendix B Energy-Absorption issues Appendix C prompt Lateral strength necessities, SEAOC Appendix D References Appendix E Notation
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Additional resources for Design of Multistory Reinforced Concrete Buildings for Earthquake Motions
OXlm is not a correct modal frequency. Assumed Masses and sprlng dlspl U~ Fig. 2-6. Determination of second mode circular frequency by Holzer's or step-by-step method. OX/m 2A 1/3 R,= vn-vn+i-Gn -5A/3 A/3 5A/3 0 Earthquake Response of Multi-Degree-of-Freedom Systems If now the calculations are made for an assumed value of u2 = 3X/m, one will find deflections a t the second floor, third floor, and top floor, respectively, of magnitudes 1, 1/3, - 8/3. T h e residual force at the top floor will be 5h.
0. The shear in the first story is obtained from this increment in deflection multiplied by the first-story stiffness, giving the entry 4X in the table. T h e inertial force at the first mass is cornputed from equation (2-10). OX/m, the result is 2X. Next, the shear in the second story is cornputed to be consistent with the load at the second floor and the shear in the first story. O b viously a shear of 2X is required to be consistent, in accordance with the equation - Qn = (2-24) Vn - Vn+-I Having this value of shear of 2X in the second story, by dividing by the stiffness in the second story of 3X, an increment in deflection of 2/3 is obtained.
Assumed Masses and sprlng dlspl U~ Fig. 2-6. Determination of second mode circular frequency by Holzer's or step-by-step method. OX/m 2A 1/3 R,= vn-vn+i-Gn -5A/3 A/3 5A/3 0 Earthquake Response of Multi-Degree-of-Freedom Systems If now the calculations are made for an assumed value of u2 = 3X/m, one will find deflections a t the second floor, third floor, and top floor, respectively, of magnitudes 1, 1/3, - 8/3. T h e residual force at the top floor will be 5h. Since the residual force has changed in sign, a value intermediate between the two values for which calculations are recorded should be assumed next.
Design of Multistory Reinforced Concrete Buildings for Earthquake Motions by John A. Blume, Leo H. Corning, Nathan M. Newmark