Design of Environmental Engineering Concrete Structures Based on Strain Limit and Crack Control
Publication: Structures Congress 2008: Crossing Borders
Abstract
Environmental engineering structures are designed for strength but crack control to prevent leakage and other long-term durability problems remain important serviceability requirements. The service design requirement is accomplished by using the environmental durability factor (EDF) on top of the applicable load factors to limit the stresses/strains in reinforcement at the service load level. The use of EDF increases the factor of safety and reduces the strain in tension steel at nominal strength. This is not consistent with the concept of Unified Design Approach (UDA) adopted in the 2006 edition of the ACI 350 code. The UDA requires that for flexural tension controlled sections, strain in the tension reinforcement should reach at least 0.005 at nominal strength. This paper proposes a more rational design method for environmental structures based on limiting strain and crack width at service level and ensuring strength at the ultimate loads. Design procedure is streamlined and the use of EDF eliminated. An example is included to illustrate the problems with the current design approach and the applicability of the proposed method.
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© 2008 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Concrete
- Concrete structures
- Continuum mechanics
- Cracking
- Engineering materials (by type)
- Engineering mechanics
- Environmental engineering
- Fracture mechanics
- Material mechanics
- Materials engineering
- Solid mechanics
- Strain
- Structural behavior
- Structural control
- Structural engineering
- Structural health monitoring
- Structural strength
- Structures (by type)
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