Product(s):	Sacs Collapse
Version(s):	All
Area:	Collapse Solutions

Community Question:

Hello Bentley I'm working using Collapse Advance in a blast/collapse analysis and I need to fulfill the parameter in the  "ASCE Design of Blast-Resistant Buildings in Petrochemical Facilities", so I wondering if is there a way to get  the limit of the deflection in SACS

Answer 

• The first solution is to use the Collapse Ductility Limit feature. The ductility limit (the maximum strain in tension) can be calculated using the Mu values in the above table and strain at the yield point (i.e., yield strain = yield stress / Young's Module). Thus, Ductility limit = Mu x yield strain. Users can enter the ductility limit (in %) for the entire model on the CLPOP2 line. Collapse Advanced also has input lines to override ductility limits for element groups or individual elements. If strain reaches the ductility limit within elements, Collapse Advanced reports it and considers that part of the element fractured - leading to more accurate analysis. 

•  If the users don't want to use the ductility limit feature, the second option is to create strain reports in the Collapse Advanced listing file (see the marked options below). The reports contain the total strain and the plastic strain. They first need to find the load step with maximum tensile strain, and for that load step, the difference between the maximum tensile strain and the plastic strain gives them the elastic strains. Then, they can calculate the ratio of total strain to the elastic strain.