Thursday, July 7, 2016

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Technical Knowledge Base Home Composite behavior

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This page is devoted to resources associated with the modeling of composite behavior using various CSI Software.

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Creep behavior is associated with time-dependen

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Creep behavior is associated with time-dependent, stress-induced changes in the strain and deformation of a structural member. Creep, along with shrinkage(decrease in direct strains over time) and aging (change in elastic modulus with age), are time-dependent material behaviors which may be applied to concrete objects using staged-construction analysis. Staged construction is a nonlinear-static application available to CSI Software with Ultimate Levels and Features. Additional information may be found in the CSI Analysis Reference Manual (Staged Construction, page 396). Staged construction is also necessary for modeling creep, shrinkage, and relaxation within tendons. Tendon elastic shortening, however, is automatically implemented with any software package.
Each of these time-dependent behaviors are specified according to CEB-FIP parameters (Comite Euro-International Du Beton, 1993). Creep formulation may follow full integration or an expedited Dirichlet series approximation (Ketchum, 1986). The CSI Analysis Reference Manual (Time-dependent Properties, page 85) presents further details.

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Damping, a property of the materia

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Damping, a property of the material and the structure, influences dynamic response. A certain type of damping is available for each type of load case. Within all load cases of a certain type, damping is applied consistently, though additional damping may be added to individual load cases.
  • Modal damping is used for response-spectrum and modal time-history analyses. Material modal damping, also known as composite modal damping, is weighted according to element and modal stiffness. For each material, users specify a material modal damping ratio r, in which 0 < r < 1, which relates to the damping ratio of each mode.
  • Damping devices may also be modeled as a structural subsystem, as described in the Tuned-mass damper tutorial.

Welcome to the CSI Knowledge Base

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Welcome to the CSI Knowledge Base
  • The CSI Knowledge Base is a searchable, online encyclopedia that provides information to the Structural Engineering community.
  • The purpose of the CSI Knowledge Base is to further understanding within the field and to assist users with CSI Software application.
  • Documentation may be of general technical interest or specific to CSI Software application.
  • Please visit the Help Space for tips on navigating the Knowledge Base and for information on contacting CSI Technical Support.
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  • Watch & LearnTM videos are available on YouTube

temp test

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