*HEADING EARTHQUAKE ANALYSIS (B23) VIA MULTIPLE BASE MOTION MODAL DYNAMICS MODEL WITH TWO SECONDARY BASES (NODE1 and NODE21) A TIME SHIFT IS APPLIED TO THE AMP RECORD FOR THE SECONDARY BASE *NODE 1 ,300. 21, *NSET,NSET=ENDS 1,21 *NSET,NSET=NOUT 1,11 *NGEN 1,21 *ELSET,ELSET=PR 10, *ELEMENT,TYPE=B23 1,1,2 *ELGEN,ELSET=EALL 1,20 *MATERIAL,NAME=A1 *ELASTIC 30.E6, *DENSITY .000728, *BEAM SECTION,SECTION=RECT,MATERIAL=A1,ELSET=EALL 1. , 2. ** THIS INPUT ASSUMES THAT bmk/multibasemotion_quake.inp ** HAS BEEN COPIED TO QUAKE01.AMP ** AMPLITUDE CURVE DATA FROM FIRST 2 SEC OF cantilever_quakedata.inp *AMPLITUDE,VALUE=RELATIVE,NAME=EQ,INPUT=QUAKE01.AMP ** THIS INPUT ASSUMES THAT bmk/multibasemotion_quake_shift.inp ** HAS BEEN COPIED TO QUAKE21.AMP ** AMPLITUDE CURVE DATA FROM FIRST 2 SEC OF cantilever_quakedata.inp WITH ** TIME SHIFT = .25 SEC *AMPLITUDE,VALUE=RELATIVE,NAME=EQ2,INPUT=QUAKE21.AMP *RESTART,WRITE,FREQUENCY=100 *BOUNDARY 1, 1 1, 6 21, 1 21, 6 *STEP *FREQUENCY,EIGENSOLVER=LANCZOS, SIM=NO 10,,,-10000. *EL PRINT,FREQUENCY=0 *BOUNDARY,BASE NAME=NODE1 1,2 *BOUNDARY,BASE NAME=NODE21 21,2 *NODE PRINT U, *MODAL FILE *END STEP *STEP EARTHQUAKE INPUT WITH .25sec SHIFT FOR RIGHT END *MODAL DYNAMIC .01 , 2.0 *SELECT EIGENMODES,GENERATE 1,7 *BASE MOTION,DOF=2,AMPLITUDE=EQ,SCALE=386.09,BASE NAME=NODE1 *BASE MOTION,DOF=2,AMPLITUDE=EQ2,SCALE=386.09,BASE NAME=NODE21 *PRINT,FREQUENCY=50 *EL PRINT,ELSET=PR,FREQUENCY=500 S,E *NODE PRINT,FREQUENCY=100 U,TU, V,TV, A,TA, *MODAL PRINT,FREQUENCY=100 GU,GV,GA, BM, *NODE FILE,NSET=NOUT U,V,A, *OUTPUT,FIELD *NODE OUTPUT,NSET=NOUT U,V,A, *OUTPUT,HISTORY *NODE OUTPUT,NSET=NOUT U,V,A, *END STEP