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Thornton Tomasetti 31 of 234 <br />LOWER-BOUND MODEL (A=0.85)NOMINAL MODEL (A=1.0)UPPER-BOUND MODEL (A=1.15)NOTE: <br />50%/50yr Axial 20%/50yr (BSE-lE)50%/50yr 20%/50yr (BSE-lE)50%/50yr 20%/50yr (BSE-lE)REQUIREMENTS OF UPPER- AND LOWER-BOUND <br />Damper Damper Damper <br />Max (k)Axial Max (k)Axial Max (k)Axial Max (k)Axial Max (k)Axial Max (k)DAMPER ANALYSES WERE DISCUSSED IN THE <br />COLUMN PMM DCR NOTES MAXIMUM REPORTED <br />Kl 316.9 376.7 Kl 365.8 437.4 Kl 413.1 497.4 <br />DAMPER AXIAL FORCES FROM FOUR GROUND <br />K3 316.3 375.9 K3 365.6 437.1 K3 412.4 496.5 MOTIONS AT 50°/0/50YR (AND 20%/50YR FOR EXTREME <br />K4 316.6 376.3 K4 365.8 437.4 K4 412.5 496.9 CONDITIONS) ARE PRESENTED HERE FOR THE <br />K6 316.5 376.4 K6 365.7 437.2 K6 412.7 496.9 LOWER, NOMINAL. AND UPPER LAMBDA VALUES (0.85, <br />K7 316.2 376.1 K7 367.0 439.0 K7 412.1 496.4 1.0,1.15). <br />K9 316.2 375.9 K9 367.0 439.1 K9 411.9 496.4 <br />DAMPERS SHOULD BE CAPABLE OF SUSTAINING THE <br />K10 316.0 375.6 K 10 366.8 438.8 K 10 411.9 496.0 <br />FORCE ASSOCIATED WITH 200% THE MAXIMUM <br />K 12 316.5 376.3 K 12 367.3 439.1 K 12 412.5 496.8 CALCULATED VELOCITY AT LIMITED PERFORMANCE <br />K13 3017 3626 K13 350.9 420.8 K 13 393.5 473.6 OBJECTIVE (50°/0/50YR). THIS CORRESPONDS TO A <br />K 14 301.4 362.6 K 14 350.8 421.0 K14 393.1 473.5 -23% INCREASE IN FORCE. TAKING THE MAX <br />K 16 301.6 362.6 K16 350.9 421.2 K 16 393.3 473.8 50°/o/50YR DAMPER FORCE (367k FROM )=1.0), THE <br />K17 300.7 361.1 K17 350.3 419.6 K 17 392.1 472.0 AMPLIFIED FORCE IS 45lk. THIS NEARLY MATCHES <br />K20 300.6 361.3 K20 349.6 419.7 K20 391.3 472.1 THE 440k NOMINAL CAPACITY OF THE SELECTED <br />DAMPERS DAMPERS HAVE STRENGTH-LEVEL <br />K21 301.8 362.8 K21 350.9 421.2 K21 392.4 474.0 CAPACITY >> 440k DAMPER EXTENSION PIPE AND <br />K22 301.7 362.8 K22 350.7 421.1 K22 392.3 474.0 DAMPER-TO-COLUMN CONNECTIONS ARE DESIGNED <br />K23 302.4 363.2 K23 352.0 421.9 K23 392.2 475.0 FOR AT LEAST 500k STRENGTH-LEVEL CAPACITY <br />USING CUSTOMARY METHODS. <br />DAMPER AXIAL FORCES FROM 4 GROUND MOTIONS UNDER LOWER-BOUND, NOMINAL, AND UPPER-BOUND ANALYSES <br />ACCIDENTAL ECCENTRICITY MODEL (A=0.85) <br />Damper <br />K 1 <br />K3 <br />K4 <br />K6 <br />K7 <br />K9 <br />K10 <br />K12 <br />K13 <br />50%/50yr 20%/50yr (BSE-lE) <br />Axial Max (k)Axial Max (k) <br />351.6 423.3 <br />350.9 422.5 <br />351.1 422.9 <br />351.7 422.9 <br />369.3 441.6 <br />369.4 441.7 <br />369.1 441.2 <br />369.7 442.0 <br />332.0 402.5 <br />NOTE: <br />ASCE41-13 SECTION 14 3.5.2 CALLS FOR <br />CHECKING ACCIDENTALECCENTRICITY IN A <br />NONLINEAR DYNAMIC ANALYSIS BY SHIFTING THE <br />CENTER OF MASS TO ADD TO ANY INHERENT <br />ECCENTRICITY. AS THE TOWER IS SYMMETRIC, <br />THE CENTER OF MASS WAS SHIFTED 5% <br />TOWARDS THE WEST AND SOUTH, AND RUN <br />USING LOWER-BOUND DAMPER PROPERTIES PER <br />C14 3.5.2.1. MAXIMUM DAMPER AXIALFORCE OF <br />369 7k IS IN LINE WITH THE FINDINGS ABOVE <br />K 14 332.2 402.4 DRIFTS FROM THIS MODEL ARE REPORTED ON <br />K 16 332.7 402.7 THE FOLLOWING SHEET <br />K 17 330.8 400.8 <br />K20 364.8 435.4 <br />K21 365.8 436.8 <br />K22 365.7 436.8 <br />K23 366.6 437.3 <br />DAMPER AXIAL FORCES FROM 4 GROUND MOTIONS CONSIDERING ACCIDENTAL ECCENTRICITY