Every building and its portions as a minimum shall be designed and constructed

Every building and its portions as a minimum shall be

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Every building and its portions, as a minimum, shall be designed and constructed to resist the effects of earthquake ground motions as prescribed by the following provisions. Additions to existing structures shall also be designed and constructed to resist the earthquake ground motion effects. Special structures including vehicular bridges, transmission towers, piers and wharves, hydraulic structures, and nuclear reactors are beyond the scope of these provisions. The process of determining earthquake loads can be broken down to following basic steps: (a) determining the maximum considered earthquake and design spectral response accelerations (b) determining the seismic base shear in conjunction with the building or structure’s dynamic characteristics (e.g. fundamental period) (c) distribution of the seismic base shear within the building or structure General Procedure for Determining Maximum Considered Earthquake and Design Spectral Response Accelerations Ground motion accelerations, represented by response spectra and coefficients derived from these spectra, shall be determined in accordance with: the general procedure described in ASCE 7 Section 9.4.12 or IBC Section 1615.1 the site-specific procedure described in ASCE 7 Section 9.4.1.3 or IBC Section 1615.2. Conditions on use of these methods depend on the seismic use group and site characteristics of the building or structure. The procedure for determining the design spectral response accelerations is as follows: 1. Determine the mapped maximum considered earthquake spectral response accelerations at short periods, S s and at 1-second period, S 1 using the spectral acceleration maps in ASCE 7 Figure 9.4.1.1a through 9.4.1.1j or IBC Figures 1615(1) through (10). Straight-line interpolation is allowed for sites in between contours. Acceleration values obtained from the maps are given in %g, where g is the gravitational acceleration. 2. Determine the site class in accordance with ASCE Section 9.4.1.2.1 or IBC 1615.1.1. Site class (A, B, C, D, E or F) is obtained based on the average shear wave velocity, v s , average standart penetration resistance, N , or the average undrained shear strength, S u . These parameters represent average values for the top 100 ft (30 m) of soil. 4
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1.051 Structural Engineering Design Prof. Oral Buyukozturk Fall 2003 3. Determine the maximum considered earthquake spectral response accelerations, adjusted for Site Class effects , at short period, S MS , and at 1-second period, S M1 , in accordance with ASCE Section 9.4.1.2.4 or IBC 1615.1.2. 4. Determine the design spectral response accelerations at short period, S DS and 1- second period, S D1 in accordance with ASCE 7 Section 9.4.1.2.5 or 1615.3.
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  • Spring '08
  • smith
  • Structural Engineering, Earthquake engineering, ASCE, structural engineering design, Prof. Oral Buyukozturk

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