Concrete Temperature Control Study for the Old River Auxiliary Structure

摘要

Finite-element method (FEM) computer simulations were made to predict temperature distribution and resulting thermal strains which are possible during construction of the Old River Auxiliary Structure. A FEM computer program computes temperature distributions in the structure during simulated construction resulting from heat of hydration of cement and subsequent heat flows based upon the thermal environment and boundary conditions. A second FEM computer program computes thermal strain distributions based upon the volume changes that are proportional to the temperature changes, gravity loads, and the mechanical boundary conditions. The objective of the simulations is to provide information upon which a temperature control plan for construction can be based to reduce the occurrence of thermal cracking. The report summarizes the results of the simulations and recommends temperature control measures based upon these results. A series of supplemental computer simulations are suggested to permit flexibility in the specification of temperature control measures.