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! <br />• <br />C GEOMETRY: There shall be no changes in horizontal dimension of the lateral-force-resisting system <br />of more than 30 percent in a story relative to adjacent stories for Life Safety and Immediate <br />Occupancy, excluding one-story penthouses. (Tier 2: Sec. 4.3.23) <br />C VERTICAL DISCONTINUITIES: All vertical elements in the lateral-force-resisting system shall be <br />continuous to the foundation. (Tier 2: Sec. 43.2.4) <br />All ve��tica/ elements in later•al — force — r•esisting systerns are contint�otis to focardation. <br />C MASS: There shall be no change in effective mass more than 50 percent from one story to the ncxt for <br />Life Safety and Immediate Occupancy. Light roofs, penthouses, and mezzanines need not be <br />considered. (Tier 2: Sec. 4.3.2.5) <br />C TORSION: The distance between the story center of mass and the story center of rigidity shall be less <br />than 20 percent of the building width in either plan dimension for Life Safety and Immediate <br />Occupancy. (Tier 2: Sec. 43.2.6) <br />C DETERIORATION OF CONCRETE: There shall be no visible deteriaration of concrete or reinforcing <br />steel in any of the vertical- or lateral-force-resisting elements. (Tier 2: Sec. 4.33.4) <br />Exposed concrete has no visible distress. <br />N/A POST-TENSION[NG ANCHORS: There shall be no evidence of corrosion or spalling in the vicinity of <br />post-tensioning or end fittings. Coil anchors shall not have been used. (Tier 2: Sec. 43.3.5) <br />Building has no post-tensioiiing anchors. <br />Lateral Force Resisting System <br />NC REDUNDANCY: The number of lines of moment frames in each principal direction shall be greater <br />than or equal to 2 for Life Safety and Immediate Occupancy. The number of bays of moment frames in <br />cach line shall be greater than or eyual to 2 for Life Safety and 3 for Immediate Occupancy. (Tier 2: <br />Sec. 4.4.1.1.1) <br />Numbers of lines in each principa! direction are greater or more than 2. Number of bays in E-W <br />direction momenl frames is 1. <br />C INTERFERING WALLS: All infill walls placed in moment frames shall be isolated from structural <br />elements. (Tier 2: Sec. 4.4.1.2.1) <br />Ir:fill walls are not placed in moment frames. <br />NC SHEAR STRESS CHECK: The shear stress in the concrete columns, calculated using the Quick Check <br />procedure of Section 3.5.3.2, shall be less than 100 psi or 2�f� for Life Safety and Immediate <br />Occupancy. (Tier 2: Sec. 4.4.1.4.1) <br />Sl�ear stress in concrete coh�mns of rnoment frmne is nlore than 100 psi. <br />NC AXIAL STRESS CHECK: The axial stress due to gravity loads in columns subjected to overtuming <br />forces shall be less than O.l Of� for Life Safety and Immediate Occupancy. Altematively, the axial <br />stresses due to overtuming forces alone, calculated using the Quick Check Procedurc of Section <br />3.53.6, shall be less than 0.30f< for Life Safety and Immediate occupancy. (Tier 2: Sec. 4.4.1.4.2) <br />ASCE 31-03 Seismic Evaluation of Eausting Buildings Basic Structural Checklist for C1 <br />