Define a single staged-construction load case with two operations.Define frame property modifiers for the cracked sections through Define > Name Property Sets > Frame Modifiers.Use staged construction to create a different model configuration with cracked-section properties.Use staged-construction analysis with named property sets to analyze different model configurations, described as follows:.Revert to the original (uncracked) model by changing the frame property modifiers to their original value. Run response-spectrum or another type of analysis for the modified model.Model the cracked sections by assigning frame property modifiers through interactive database editing, available through Edit > Interactive Database Editing > Model Definition > Frame Assignments > Frame Items Assignments > Table: Frame Property Modifiers.Develop the model using uncracked properties and analyze the system for strength-based load cases.Use frame property modifiers as follows:.Create two separate models, one with uncracked properties and one with cracked-section properties. Cracked-section properties are not automatically implemented in response-spectrum or any other type of analysis, though they may be manually input through any one of the following methods:
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