CSiPlant offers P-Delta analysis, including P-Delta with large displacements. P-Delta analysis, also known as second-order geometric nonlinearity, involves the equilibrium and compatibility relationships of a structural system loaded about its deflected configuration. It also accounts for real world changes to element stiffness due to axial loads, as tension loads increase lateral stiffness of elements, while compression loads reduce lateral stiffness according to the laws of physics. The tightening of guitar strings is a good example of P-delta effects changing element stiffness. With CSiPlant, considering P-delta effects is as easy as a mouse click requiring only a negligible amount of analysis time.
P-Delta analysis has been a near-mandatory requirement in structural design codes for many years due to the importance of its effects in design calculations. In fact, ASCE 7 has over 100 mentions of P-delta (P-Δ). However, piping stress models have traditionally ignored P-Delta effects since most older generation piping stress software programs are incapable of P-Delta analysis.
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