## Abstract

A method of computing the age-dependent spectra of a Kelvin chain model from given data on creep of concrete is presented, along with a full listing of a FORTRAN IV subroutine. The method is based on a Dirichlet series expansion of creep rate as a function of the duration of creep test at constant current time. The inverse retardation moduli are approximated as a Dirichlet series in concrete age and as a quintic polynomial in the logarithm of the retardation time. These approximations serve at the same time as a smoothing device. They also enable explicit expressions for creep functions. The retardation moduli are determined by the method of least-squares. Numerical examples demonstrate that the retardation spectra completely characterize concrete creep because the original creep function can be recovered from them with a negligible error. The retardation spectra provide a rate-type creep law, which is necessary for analyzing large structural systems.

Original language | English (US) |
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Pages (from-to) | 797-806 |

Number of pages | 10 |

Journal | Cement and Concrete Research |

Volume | 4 |

Issue number | 5 |

DOIs | |

State | Published - Jan 1 1974 |

## ASJC Scopus subject areas

- Building and Construction
- Materials Science(all)