Basic
Modulus of Elasticity (kip/in2): Young's Modulus (Elastic Modulus) of the material. This has an direct impact on both finite element analysis (FEA) and design.
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Stress Strain Model (readonly): Different types of materials have their own respective stress-strain curves by default. For steel materials, a bilinear steel stress-strain curve is utilized, whereas for rebars, Menegotto-Pinto steel curves are used. For concrete, the Mander concrete curve is used, and for prestressing tendons, prestressing steel curves are used. This has no impact on finite element analysis (FEA) and a direct impact on design.
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Steel
Steel Yield Stress (kip/in2) : This has no impact on finite element analysis (FEA) and a direct impact on design.
Steel Ultimate Stress (kip/in2): This has no impact on finite element analysis (FEA) and a direct impact on design.
Concrete
Concrete Strength at 28 Days (kip/in2): Compressive strength of concrete at day 28.This has no impact on finite element analysis (FEA) and a direct impact on design.
Time Dependent
Time Dependent Elastic Modulus[Include/Ignore]: The time-dependent modulus of elasticity is a parameter used to account for the change in elastic modulus over time due to creep and shrinkage for concrete. When the time-dependent modulus of elasticity is included, the modulus of elasticity values entered under basic tab are overridden based on the computed values. According to CEB-FIP 1990, the following parameters are used to compute the time-dependent modulus of elasticity:
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PT Losses from Structure[Include/Ignore]: Elastic shortening losses refer to the reduction in the length of a prestressed concrete member caused by the initial stress generated during the pre-tensioning process or other external loads that could alter the length of the member. To account for this effect in the analysis, it is essential to select both the material and stage settings that include it.
CEB-FIP 1990
Concrete Strength at 28 Days (fcm) [kip/in2]: Mean compressive strength of concrete at the age of 28 days.
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Temperature Adj. Concrete Age[Yes/No]: If the user selects "yes" to consider the impact of temperature during curing, the actual concrete age should be modified using equation (2.1-87) in accordance with CEB-FIP 1990.
Dynamics
Rayleigh Damping Mass: This is the mass term in the Rayleigh damping model and represents the mass-related damping. It is defined as a linear combination of the mass matrix and the stiffness matrix of the structure, with the coefficients of the combination chosen to give the desired damping characteristics. The damping mass term is used to model the energy dissipation due to the velocity of the structure's mass.
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