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From page 146... ... 7 CONCLUSIONS AND SUGGESTED FUTURE RESEARCH 7.1 Conclusions 7.1.1 General Conclusions Related to the Calibration of Service Limit States • The main problem in calibrating the service limit states is the lack of clear consequences to exceeding the limit state. • The target reliability index used in the calibration of any limit state is a measure of the frequency this limit state is expected to be violated during the period assumed in the calibration. Read the entire page →
From page 147... ... 7.1.3 General Conclusions Related to the Specific Limit States Calibrated 7.1.3.1 Cracking of Reinforced Concrete Decks through the Distribution of Reinforcement • Assessment of current practice leads to a recommended target reliability indices of 1.6 for the base case (Class 1 exposure) and 1.0 for situations when there is increased concern of appearance and/or corrosion (Class 2 exposure) Read the entire page →
From page 148... ... criteria and assuming one lane of traffic on the load side of the reliability index calculation. For sections satisfying the following conditions: • Time-dependent losses are determined using time step method, • Gross sections properties are used for the calculations, and • The calculations of the force in the prestressing steel neglects the effects of the elastic gain. Read the entire page →
From page 149... ... • Instrumentation of a prestressed concrete girder bridge on one of the heavily travelled roads to confirm the assumption that prestressed concrete beams may actually crack in service under heavy loads is needed. The bridge should be located in a jurisdiction that uses the HL-93 loading without jurisdiction-specific heavy vehicles for design. Read the entire page →

From page 146...

... 7 CONCLUSIONS AND SUGGESTED FUTURE RESEARCH 7.1 Conclusions 7.1.1 General Conclusions Related to the Calibration of Service Limit States • The main problem in calibrating the service limit states is the lack of clear consequences to exceeding the limit state. • The target reliability index used in the calibration of any limit state is a measure of the frequency this limit state is expected to be violated during the period assumed in the calibration.

Read the entire page →

From page 147...

... 7.1.3 General Conclusions Related to the Specific Limit States Calibrated 7.1.3.1 Cracking of Reinforced Concrete Decks through the Distribution of Reinforcement • Assessment of current practice leads to a recommended target reliability indices of 1.6 for the base case (Class 1 exposure) and 1.0 for situations when there is increased concern of appearance and/or corrosion (Class 2 exposure)

Read the entire page →

From page 148...

... criteria and assuming one lane of traffic on the load side of the reliability index calculation. For sections satisfying the following conditions: • Time-dependent losses are determined using time step method, • Gross sections properties are used for the calculations, and • The calculations of the force in the prestressing steel neglects the effects of the elastic gain.

Read the entire page →

From page 149...

... • Instrumentation of a prestressed concrete girder bridge on one of the heavily travelled roads to confirm the assumption that prestressed concrete beams may actually crack in service under heavy loads is needed. The bridge should be located in a jurisdiction that uses the HL-93 loading without jurisdiction-specific heavy vehicles for design.

Read the entire page →

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