In amssive concrete streucture cracks may already develop at an early stage, due to the thermal stresses induced by the heat produced during the hydration reaction of the cement. A two-step numerical simulation usin gclassical finite element procedures is presented, allowing for the prediction of these stresses an thus the assessment of the risk of cracking. A nonlinear transient thermal analysis, using a recentrly developed model for the internal heat production in the concrete, yields the temperature distribution history. The subsequent stress analysis is based on an elastic model with continuously developing material characteristics. Though simplified, this model already yields realistic results with practical usefulness, while more comprehensive mecahnical mdoels for the early age concrete are being developed. Results are presented concerning massive concrete blocks used for the protection of sea walls and breakwaters against waves.
展开▼
