1993 Volume 42 Issue 475 Pages 436-441
A back analysis system has been proposed for the structural design and temperature control of mass concrete structures. The system employs a nonlinear programming to heat transfer analysis using the finite element method. An effort was made to improve the efficiency of search, specifically in the case of the simplex method. Improvements were made on the following items:
•Determination of the effective domain.
•The shape of the initial simplex.
•Judgement on convergence of the simplex in search.
By using the proposed back analysis system, the inner heat generation of concrete is readily identified from the measurement results in a specimen made near a culvert box. Interior concrete temperatures are then calculated in the side wall of culvert box by using the identified results. The applicability of the back analysis scheme to estimate thermal characteristics from the field measurement results can be verified through a comparison of the calculated and measured temperatures in the culvert box.
