Analytical Simulation for Structural Performance During Construction
Large civil structures typically require extensive construction effort extending over many months. The placement of large volumes of concrete can generate high internal temperatures due to the heat of hydration that may lead to thermally induced cracking and residual stresses. Concrete cracking during construction for hydraulic structures has additional consequences because of maintenance issues with water penetration and flow characteristics.
ANATECH, a Structural Integrity Associates company has performed constructability studies for a wide variety of construction methods to evaluate the potential for thermally induced cracking. These analyses involve coupled thermal stress analysis using nonlinear and time dependent characterizations for the heat of hydration, concrete aging, shrinkage, creep, and cracking. Modeling for embedded cooling coils to control internal temperatures during concrete placement and curing and for final cooling in arch dams to open contraction joints for grouting has also been used. These analyses allow cost optimization of the construction process for lift heights, lift sequences and timing, concrete placement temperatures, and other construction parameters while maintaining sound and durable structures.
Mitigation of Thermal Induced Cracking
- Conventional mass concrete with formwork
- Innovative float-in pre-cast concrete segments with tremie in-fill
- Innovative lift-in pre-cast concrete shells with tremie in-fill
- Coffer Box with wet tremie foundation layer
- Embedded cooling coils in mass concrete
- Roller compacted concrete