By Finley A. Charney
Seismic so much: consultant to the Seismic Load Provisions of ASCE 7-05 offers authoritative motives of the seismic provisions provided in minimal layout quite a bit for constructions and different constructions, ASCE/SEI 7-05. With transparent, concise language Seismic so much illustrates the most important techniques and courses structural engineers in employing the most up-tp-date considering during this quickly altering self-discipline into the layout of recent buildings. The booklet deals greater than 20 precise examples that examine particular provisions of the traditional and show the applying of the supply in comparing the seismic loading specifications for development constructions. The examples consultant structural engineers during the strategy of assessing stipulations equivalent to: selecting occupancy, significance, and seismic layout different types, picking a structural approach, and studying the seismic specifications. issues contain construction irregularities, structural research, process forces, and cargo elements, in addition to go with the flow and P-delta results. Seismic lots encompasses a commonly asked questions part and 3 appendixes with supplementary fabric.
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Extra info for Seismic Loads: Guide to the Seismic Load Provisions of ASCE 7-05
Example text
48 Seismic Loads: Guide to the Seismic Load Provisions of ASCE 7-05 Example 8 Combinations of Lateral Load Resisting Systems The examples in this chapter deal with the situation in which there are different lateral load resisting systems in the same direction, in orthogonal directions, or along the height of a building. At issue is the height limitation for the combined system and the appropriate values of R, Wo, and Cd to use for the systems. 2-1 apply independently to the two orthogonal directions.
EBF, eccentrically braced frame; CBF, concentrically braced frame; and BRB, buckling restrained brace. 8-5) Eq. 7 TS/R Physically, TMF is the period at which Eqs. 8-5 give the same values for Cs. For the ten-story building, Cs given by Eq. 8-5 controls for the eccentrically braced frames, the buckling restrained braced frames, and the moment frames. This result occurs because of the high R values and the relatively long period of vibration for these systems. Eq. 8-5 does not control for the dual systems because these systems, which have high R values, have relatively low periods of vibration.
A survey of locally available materials and labor costs has indicated that the structural system should be constructed from structural steel. Any structural system may be used, but architectural considerations require that no shear walls or diagonal bracing elements be used at the perimeter of the building. Table G7–1 and Table G7–2 list all of the viable structural systems for the ten-story and the four-story buildings, respectively. 2-1 of ASCE 7. Tables G7–1 and G7–2 also list the system R and Cd values, the period of vibration, the seismic response coefficient Cs, the design base shear, and the effective R value, which is defined later in this example.