A Ground Structure Method to Minimize the Total Installed Cost of Steel Frame Structures

TitleA Ground Structure Method to Minimize the Total Installed Cost of Steel Frame Structures
Publication TypeWorking Paper
AuthorsRanalli, F., F. Flager, and M. Fischer
Year of Publication2017
Date Published04/2017

This paper presents a new ground structure method to optimize the topology and discrete member sizing of steel frame structures in order to minimize total installed cost, including material, fabrication and erection components. The proposed method improves upon existing cost-based ground structure methods by incorporating constructability considerations well as satisfying both strength and serviceability constraints. The architecture for the method is a bilevel Multidisciplinary Feasible (MDF) architecture in which the discrete member sizing optimization is nested within the topology optimization process. For each structural topology generated, the sizing optimization process seek to find a set of discrete member sizes that result in the lowest total installed cost while satisfying strength (member utilization) and serviceability (node deflection and story drift) criteria. To accurately assess cost, the connection details for the structure are generated automatically using accurate site-specific cost information obtained directly from fabricators and erectors. Member continuity rules are also applied to each node in the structure to improve constructability. The proposed optimization method is benchmarked against conventional weight-based ground structure optimization methods resulting in an average cost savings of up to 30% with comparable computational efficiency.
The authors would like to thank the Stanford CIFE for the contribution and support of its members. The authors appreciation is also directed at Disney Imagineering Shanghai for providing numerous case studies and for their technical collaboration in developing and maintaining the SAP2000
wrapper. To conclude, the authors would like to sincerely thank Autodesk for their support during the early development of the project.

KeywordsConstruction, Cost Estimation, Cost-Based Structural Optimization, Cost-Based Topology and Sizing Optimization, Design, Multidisciplinary Optimization of Steel Structures, Simulation, Steel Frame Ground Structure Optimization
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Last modified Tue, 8 Aug, 2017 at 14:11