Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Rational and Safe Design of Concrete Transportation Structures for Size Effect and Multi-Decade Sustainability
The overall goal of this project was to improve the safety and sustainability in the design of large prestressed concrete bridges and other transportation structures. The safety of large concrete structures, including bridges, has been insufficient. This is evidenced by the worldwide rate of failures of very large concrete structures which has historically been about 1 in a thousand per lifetime, although 1 in a million is the maximum tolerable. Improvement necessitates taking into account the size effect on quasibrittle failure loads, a phenomenon that has been mostly ignored by the ACI code committee until recently, but now is considered seriously, largely as a result of this project. The multi-decade durability has been rather poor for the segmentally erected prestressed concrete box girder bridges, many of which deflected within about 20 to 40 years several times more than expected in design. Significant improvements in multi-decade prediction of creep and shrinkage and their effects in bridges have been achieved under this funding. They aim at: design practice, computer programs for engineering practice, including commercial codes, design codes or standard design recommendations (ACI, AASHTO, RILEM, fib), interpretation of measurements on monitored structures, predictive material model formulation, material testing standards (ASTM, RILEM, fib), and design aids.
Rational and Safe Design of Concrete Transportation Structures for Size Effect and Multi-Decade Sustainability
The overall goal of this project was to improve the safety and sustainability in the design of large prestressed concrete bridges and other transportation structures. The safety of large concrete structures, including bridges, has been insufficient. This is evidenced by the worldwide rate of failures of very large concrete structures which has historically been about 1 in a thousand per lifetime, although 1 in a million is the maximum tolerable. Improvement necessitates taking into account the size effect on quasibrittle failure loads, a phenomenon that has been mostly ignored by the ACI code committee until recently, but now is considered seriously, largely as a result of this project. The multi-decade durability has been rather poor for the segmentally erected prestressed concrete box girder bridges, many of which deflected within about 20 to 40 years several times more than expected in design. Significant improvements in multi-decade prediction of creep and shrinkage and their effects in bridges have been achieved under this funding. They aim at: design practice, computer programs for engineering practice, including commercial codes, design codes or standard design recommendations (ACI, AASHTO, RILEM, fib), interpretation of measurements on monitored structures, predictive material model formulation, material testing standards (ASTM, RILEM, fib), and design aids.
Rational and Safe Design of Concrete Transportation Structures for Size Effect and Multi-Decade Sustainability
Z. P. Bazant (Autor:in)
2012
26 pages
Report
Keine Angabe
Englisch
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