

 ETABS Ultimate 64-bit 23.2.0 Build 4400 (Analysis Build 10002/64)
 File: C:\Users\Asus\Desktop\M...k Steel\Final Files\Truss Guard\Truss Guard.LOG




 B E G I N   A N A L Y S I S                                2026/05/14  12:56:55


 RUNNING ANALYSIS AS A SEPARATE PROCESS
 USING THE ADVANCED SOLVER (PROVIDES LIMITED INSTABILITY INFORMATION)

 NUMBER OF JOINTS                          =           4
    WITH RESTRAINTS                        =           2
    WITH MASS                              =           4
 NUMBER OF FRAME/TENDON ELEMENTS           =           3
 NUMBER OF LOAD PATTERNS                   =           2
 NUMBER OF ACCELERATION LOADS              =          12
 NUMBER OF LOAD CASES                      =           7
 NUMBER OF MASS SOURCES                    =           1

 UNITS (FORCE, LENGTH, TEMPERATURE, TIME)  = kip, in, °F, sec
 GRAVITATIONAL ACCELERATION                =  386.088583

 ADDRESSABLE PHYSICAL MEMORY (RAM)         =      15.855 GB

 PARALLELIZATION OF ANALYSIS OPERATIONS:
  (Env. variable SAPFIRE_NUM_THREADS not set)
 NUMBER OF THREADS: STATE (AUTOMATIC)      =           6
 NUMBER OF THREADS: STIFFNESS (AUTOMATIC)  =           6
 NUMBER OF THREADS: EVENT (AUTOMATIC)      =           6
 NUMBER OF THREADS: MOVE (AUTOMATIC)       =           6
 NUMBER OF THREADS: RESPONSE (AUTOMATIC)   =           6
 NUMBER OF THREADS: SOLVE (AUTOMATIC)      =           6
 NUMBER OF THREADS: FORM (AUTOMATIC)       =           6


 E L E M E N T   F O R M A T I O N                                      12:56:55



 L I N E A R   E Q U A T I O N   S O L U T I O N                        12:56:55

 FORMING STIFFNESS AT ZERO (UNSTRESSED) INITIAL CONDITIONS

 TOTAL NUMBER OF EQUILIBRIUM EQUATIONS     =           7
 NUMBER OF NON-ZERO STIFFNESS TERMS        =          22

 * * * W A R N I N G * * *
 THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED !!
 CHECK THE STRUCTURE CAREFULLY FOR:
 - INADEQUATE SUPPORT CONDITIONS, OR
 - ONE OR MORE INTERNAL MECHANISMS, OR
 - ZERO OR NEGATIVE STIFFNESS PROPERTIES, OR
 - EXTREMELY LARGE STIFFNESS PROPERTIES, OR
 - BUCKLING DUE TO P-DELTA OR GEOMETRIC NONLINEARITY, OR
 - A FREQUENCY SHIFT (IF ANY) ONTO A NATURAL FREQUENCY

 TO OBTAIN FURTHER INFORMATION:
 - USE THE STANDARD SOLVER, OR
 - RUN AN EIGEN ANALYSIS USING AUTO FREQUENCY SHIFTING (WITH
   ADDITIONAL MASS IF NEEDED) AND INVESTIGATE THE MODE SHAPES


 ---------------------------------
 BASIC STABILITY CHECK FOR LINEAR LOAD CASES:
    NUMBER OF NEGATIVE STIFFNESS EIGENVALUES SHOULD BE ZERO FOR STABILITY.
    (NOTE: FURTHER CHECKS SHOULD BE CONSIDERED AS DEEMED NECESSARY,
     SUCH AS REVIEWING EIGEN MODES FOR MECHANISMS AND RIGID-BODY MOTION)

    NUMBER OF NEGATIVE EIGENVALUES         =           0,  OK.
 ---------------------------------


 L I N E A R   S T A T I C   C A S E S                                  12:56:55

 USING STIFFNESS AT ZERO (UNSTRESSED) INITIAL CONDITIONS

 TOTAL NUMBER OF CASES TO SOLVE            =           6
 NUMBER OF CASES TO SOLVE PER BLOCK        =           6

 LINEAR STATIC CASES TO BE SOLVED:

 CASE: DEAD
 CASE: EXALL+0/3EY
 CASE: EYALL+0/3EX
 CASE: EYALL-0/3EX
 CASE: EXALL-0/3EY
 CASE: ~LLRF


 E I G E N   M O D A L   A N A L Y S I S                                12:56:55

 CASE: MODAL

 USING STIFFNESS AT ZERO (UNSTRESSED) INITIAL CONDITIONS

 NUMBER OF STIFFNESS DEGREES OF FREEDOM    =           7
 NUMBER OF MASS DEGREES OF FREEDOM         =           2
 MAXIMUM NUMBER OF EIGEN MODES SOUGHT      =          15
 MINIMUM NUMBER OF EIGEN MODES SOUGHT      =           3
 NUMBER OF RESIDUAL-MASS MODES SOUGHT      =           0
 NUMBER OF SUBSPACE VECTORS USED           =           2
 RELATIVE CONVERGENCE TOLERANCE            =    1.00E-09

 FREQUENCY SHIFT  (CENTER) (CYC/TIME)      =     .000000
 FREQUENCY CUTOFF (RADIUS) (CYC/TIME)      =  -INFINITY-
 ALLOW AUTOMATIC FREQUENCY SHIFTING        =         YES

 * * * I N F O * * *
 NUMBER OF MODES SOUGHT REDUCED TO THE NUMBER OF MASS DEGREES OF FREEDOM



 Original stiffness at shift : EV= 0.0000000E+00, f=     .000000, T=  -INFINITY-
 Number of eigenvalues below shift =      0

 Iteration    Approximations to next 2 eigenvalues, from shift EV= 0.0000000E+00
       1   4.3226931E+04 9.9709664E+05

 Found mode      1 of      2:  EV= 4.3226931E+04, f=   33.090043, T=    0.030221
 Found mode      2 of      2:  EV= 9.9709664E+05, f=  158.923733, T=    0.006292

 NUMBER OF EIGEN MODES FOUND               =           2
 NUMBER OF ITERATIONS PERFORMED            =           1
 NUMBER OF STIFFNESS SHIFTS                =           0


 A N A L Y S I S   C O M P L E T E                          2026/05/14  12:56:55
