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P-delta effect example

P-delta effect example

P-delta effect example

(OP)
STRUDL 'EXRC05' 'EXAMPLE JOB TO DEMONSTRATE P-DELTA ANALYSIS'
*TITLE 'EXRC05 - EXAMPLE JOB TO DEMONSTRATE P-DELTA ANALYSIS'
$
$***********************************************************************
$* **  PROBLEM DESCRIPTION:  Sample problem for GTSTRUDL Reinforced
$* **                        Concrete design.
$***********************************************************************
$
MATERIAL REINFORCED CONCRETE
METHOD ACI318-83

TYPE PLANE FRAME

UNITS FEET
JOINT COORDINATES
  1   0.   8.  S
  2  12.   8.  S
  3  28.   0.  S
  4  40.   2.  S
  5   0.  20.
  6  12.  20.
  7  28.  20.
  8  40.  20.
  9  28.  32.
 10  40.  32.

JOINT RELEASES
  1 TO 4 MOMENT Z

MEMBER INCIDENCES
  1   1  5
  2   2  6
  3   3  7
  4   4  8
  5   5  6
  6   6  7
  7   7  8
  8   7  9
  9   8 10
  10  9 10

UNITS INCHES
MEMBER DIMENSIONS PRISMATIC
  1 TO 4 8 9   RECT B 12 H 12
  5 TO 7 10    RECT B 12 H 18

UNITS KIPS FEET
DEAD LOAD 'DL' -Y ALL MEMBERS
  MEMBER LOADS
   5 TO 7    FORCE Y UNIFORM FRAC W -0.144 LA 0.0 LB 1.0

LOAD 'LL'
  MEMBER LOADS
   5 TO 7 10 FORCE Y UNIFORM FRAC W -1.0 LA 0.0 LB 1.0
   6         FORCE Y CONC    FRAC P -100. L .25

LOAD 'WL'
  JOINT LOADS
   5 9       FORCE X  1.0
CINPUT

LOAD COMBINATION 1 COMBINE 'DL' 1.4 'LL' 1.4

LOAD COMBINATION 2 COMBINE 'DL' 1.05 'LL' 1.275 'WL' 1.275

LOAD COMBINATION 3 COMBINE 'DL' 0.9  'WL' 1.3

STIFFNESS ANALYSIS
cinput

LOAD LIST 1 2 3
LIST FORCES MEMBERS 3 6
LIST DISPLACEMENT JOINT 10

SLENDERNESS EFFECTS FOR COLUMNS 1 TO 4 8 9 BETAD 0.4
SLENDERNESS EFFECTS FOR BEAMS   5 TO 7 10  REDUCE I BY 50 PERCENT

CONVERGENCE TOLERANCE 0.001

PDELTA LOAD 'PD-1' COMBINE 1 1.0
PDELTA ANALYSIS NUMBER OF ITERATIONS 10

PDELTA LOAD 'PD-2' COMBINE 2 1.0
PDELTA ANALYSIS                             $ DEFAULT TO 1 ITERATION
LIST FORCES MEMBERS 3 6
PDELTA ANALYSIS CONTINUE NUMBER OF ITERATIONS 10

PDELTA LOAD 'PD-3' COMBINE 3 1.0
PDELTA ANALYSIS NUMBER OF ITERATIONS 10

LOAD LIST 'PD-1' 'PD-2' 'PD-3'
LIST FORCES MEMBERS 3 6
LIST DISPLACEMENT JOINT 10

FINISH

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