Thermal Stress Analyses and Reinforcement Design of Massive RC Structures

Nannan Shi1　Runxiao Zhang2　Dahai Huang1

（1.DepartmentofCivilEngineering，BeihangUniversity，Beijing，China；2.DepartmentofCivilEngineering，UniversityofToronto，Toronto，Canada）

Abstract：Massive reinforced concrete（RC）structure is widely used in long-term damp environments.To improve the concrete durability and reduce the reinforcing steel corrosion，crack width control is more rigorous in massive RC structure.In this paper，the short-term（30 days）temperatures of concrete are measured by the distributed temperature system（DTS）to inverse the thermal parameters using the genetic algorithm（GA），and the long-term（300 days）temperature is predicted by using the calculatedthermal parameters.Moreover，thermal stress field considering the creep is calculated based on the eight-parameters-equation，and the parameters were modified by the results of temperature stress test machine（TSTM）.Furthermore，a quantitative reinforcement configuration method is proposed on the basis of the predicted thermal stress field，and its feasibility and effectiveness are verified by a sluice pier structure.Finally，the optimal reinforcement scheme obtained was selected by the comparisons of the crack width，reinforcement stress and the total cross-sectional area of reinforcement.This article provides a new methodology to design reinforcement configuration for massive RC structure.

Keywords：massive reinforced concrete；reinforcement design；thermal stress；crack width