7.12. sdfResponse command¶
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sdfResponse
(m, zeta, k, Fy, alpha, dtF, filename, dt[, uresidual, umaxprev]) It is a command that computes bilinear single degree of freedom response in C++, and is much quicker than using the OpenSees model builder. The command implements Newmark’s method with an inner Newton loop.
m
(float)mass zeta
(float)damping ratio k
(float)stiffness Fy
(float)yielding strength alpha
(float)strain-hardening ratio dtF
(float)time step for input data filename
(str)input data file, one force per line dt
(float)time step for analysis uresidual
(float)residual displacement at the end of previous analysis (optional, default=0) umaxprev
(float)previous displacement (optional, default=0) The command returns a list of five response quantities.
umax
(float)maximum displacement during analysis u
(float)displacement at end of analysis up
(float)permanent residual displacement at end of analysis amax
(float)maximum acceleration during analysis tamax
(float)time when maximum accleration occurred