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The design of structural members subjected to seismic activity has progress ed in recent years but does not yet include the effects of cold temperatures. In areas such as Alask , the Midwest, East Coast, and even in some parts of the West Coast, this approach introduc es a real deficiency as it is likely that an earthquake will occur during winte r months. The current research program was initiated to address this deficiency by developing a s ection analysis tool program capable of defining the moment-curvature response in either warm or l ow temperatures. As part of this investigation, the stress-strain behavior of A7 06 Grade 60 mild steel reinforcement was studied under low temperatures (20 0C to -400C) to ensure that the effects of temperature is accurately accounted for in the newly devel oped analysis tool. In addition to mild steel, the effects of cold temperatures on the behavior of soil, unconfine d concrete, and confined concrete are currently being examined by other resea rch rs t Iowa State University. The Versatile Section Analysis Tool (VSAT) was developed to reduce the general limitations found in other programs. Amongst these limitations are limited avail able material models, lack of commonly used section shapes, and the exclusion of soil and low temperatur e effects. VSAT was constructed with many different features to provide vers atility in how the user wishes to establish material properties for a particular analys is. VSAT includes the following features: permitting different cross-sections, defining norma l strength or UHPC material properties, defining simplistic or sophisticated mild steel or pre stressing steel material properties, allowing the addition of soil pressure, including a steel s hell circular section, and accounting for low temperature effects on material behavior. The testing of mild steel reinforcement at low temperatures showed a quadrat ic increase in the yield and ultimate strengths of 5.1 and 6.3 percent, respectively, when lower i g specimen temperatures from 20 0C to -400C. It was also found that the modulus of elasticity, ultimate strain, and strain hardening strain were insignificantly affec ted under the same conditions. Assumptions for the behavioral changes of concrete under low tempera tures to be used in VSAT have been compiled from previous research until current testing ca n be

Development of a Versatile Section Analysis Tool (VSAT) for use in structural design with a seismic emphasis