This document is overview of staad and how it can be used for offshore structures. I hope it will be use full for all structural engineersFull description
staad project
This document is overview of staad and how it can be used for offshore structures. I hope it will be use full for all structural engineers
STAAD.Pro is a structural analysis and design computer program originally developed by Research Engineers International at Yorba Linda, CA in 1997.
modelling and analysis of domes in STAAD
PEB
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site visit report on Hot Mix plant
STRUCTURAL ANALYSIS AND DESIGN - FORUM
P-DELTA ANALYSIS
Posted bychaz on Tue, Dec 4 2012 8:53 AM
Technical Reference Manual 5.37.2 P-Delta Analysis Options Used to perform a second-order analysis, considering either large- or small-delta effects— effects—or both— both —on the structure. 1. P-Delta analysis with Small & Large Delta effects or Large Delta effects only. With this option the global forces are adjusted with every iteration
PDELTA (n) ANALYSIS (CONVERGE (m)) ( { LARGEDELTA | SMALLDELTA } ) (PRINT printoptions) Where: n = no. of iterations desired (default value of n = 1). m = the maximum number of iterations used to check convergence, even if convergence has not been achieved. Do not use use CONVERGE when n is specified. SMALLDELT is the default
Based on the above section of the technical reference manual, how to perform second order analysis considering both small delta and large delta effect on STAAD.Pro??? second order analysis, large delta, P-delta analysis , small delta
Posted byKris Sathia on Tue, Dec 4 2012 10:51 AM
In versions of STAAD created during the past 3-4 years, the following command will ensure that both effects are considered considered.. PDELTA 30 ANALYSIS SMALLDELTA If you have a version of STAAD created during the past 6-12 months (V8i SS3 and SS4), the word SMALLDELTA is not needed, as in the following example. PDELTA 30 ANALYSIS But no harm in including it.
P Delta and Linear Anaylsis
Posted byAnonymous on Mon, Dec 13 2010 5:18 PM
I am wonderinf if there a way to do both a P Delta analysis and a linear analysis together and have the two different results displayed next to eachother so I can compare them Thanks for any help offered
Posted bySKLose on Tue, Dec 14 2010 6:13 AM
Here is a hypothetical example. In this example, Load 1 is the vertical load. Load 2 is the lateral load. To obtain the combined effect of these, one with a simple linear analysis, and the other with a PDelta, create two combination cases. Load 11 is the combination for examining the PDelta effect. Since this does not satisfy the principle of superposition, we combine the two cases using the REPEAT LOAD syntax. Load 12 is the linear combination for linear elastic analysis that does not include the Pdelta effect. Since this satisfies the principle of superposition, the combination can be done using the "LOAD COMBINATION" syntax. LOAD 1 GRAVITY LOAD SELF Y -1.0 LOAD 2 LATERAL LOAD JOINT LOAD 3 TO 6 FX 1.5 PERFORM ANALYSIS LOAD 11 GRAVITY + LATERAL REPEAT LOAD 1 1.0 2 1.0 LOAD COMBINATION 12 GRAVITY + LATERAL 1 1.0 2 1.0 PDELTA 30 ANALYSIS SMALLDELTA Load case 11 will be analysed by solving the expression {d} = [Kinv]{P1 + P2} Load case 12 will be solved by algebraic addition of {d1} and {d2} where {d1} and {d2} are the displacements for cases 1 and 2 respectively. The resulting displacements are used to compute member forces and support reactions.
