Nonlinear Analysis

Using Performance-Based Design Procedures

The methodology used by SC Solutions for nonlinear analysis incorporates performance-based design procedures and allows for a structure that will not collapse during a maximum credible earthquake. Our methodology examines the behavior of a structure at various service levels, along with the corresponding costs, to determine the most cost effective design that satisfies the design criteria and its performance limits. Examples of various service levels may be based on component and system displacement limits, failure mechanisms, and material properties, such as: Major damage, but the structure does not collapse, and life safety is assured. The structure will likely be closed and may have to be replaced entirely. Moderate damage, no collapse. The structure may be closed for an extended period. Some parts can be repaired, but much will have to be replaced. Repairable damage. The structure may be closed temporarily or partially, but can be repaired. Repairable damage. The structure can be repaired without a shut down. Minor damage. Repairs can be delayed until regularly scheduled maintenance. No damage. The cost differential between designing to Service Level 1 through Level 4 may prove to be relatively small, whereas designing to Levels 5 or 6 is typically much more expensive. By relating levels of service to cost, the overall minimum life cycle cost may indicate that designing to Levels 3 or 4 is more economical than simply designing to Service Level 1. The cost and effort required to go to a higher service level will not necessarily be significantly increased. The design cost savings will be realized in the actual construction and subsequent life cycle of the structure. This approach is therefore more far-sighted and gives the design team more flexibility by allowing the overall cost of the system to be examined and the most cost-effective option to be considered.