Cast-in-Place Concrete Connections for Precast Deck Systems (2011) / Chapter Skim
Currently Skimming:
Pages 232-239
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 232... ...
233 Chapter 7 PCSSS: Conclusions and Recommendations 7.0 Introduction Several numerical and experimental investigations were completed and reviewed during the NCHRP 10-71 project related to issues of importance to the design and performance of precast composite slab span system (PCSSS) bridges.
|
From page 233... ...
234 The culmination of the NCHRP 10-71 was the development of a design guide and examples which is included in Appendices A and B for application to PCSSS bridges. The following sections provide a summary of the investigation and conclusions from the components of the study.
|
From page 234... ...
235 7.2. Restraint Moment It is important to consider the effects of restraint moment in the design of PCSSS or design the systems as a series of simple spans.
|
From page 235... ...
236 monolithic slab span FEM models. The conservatism in the factors for monolithic slab span bridges was sufficient to cover the cases of the PCSSS bridges even considering the potential effects of reflective cracking as discussed above.
|
From page 236... ...
237 7.5. Composite Action and Horizontal Shear Strength To conclude the laboratory tests, the large-scale bridge specimens were loaded to near ultimate levels of load to investigate the ability for the precast slab span sections to remain composite with the CIP concrete topping.
|
From page 237... ...
238 Reflective cracking was intentionally induced in the Concept 1 and Concept 2 large-scale laboratory specimens to investigate the performance of the PCSSS through a range of loading that was designed to simulate both fatigue performance due to vehicular loading, as well as the influence of environmental effects. Two million cycles of fatigue loading were applied near the longitudinal precast joint with a patch load to simulate tire traffic on both spans of the Concept 1 laboratory bridge, as well as on the Concept 2 simply-supported laboratory bridge.
|
From page 238... ...
239 the reflective cracking at a higher depth, and also because the instrumentation was located higher in the section, and therefore strains measured in Span 2 would have been larger if they had been measured lower in the section, at the same approximate depths as in Span 1 of the Concept 1 laboratory bridge and the Concept 2 laboratory bridge. Also documented during the environmental effect simulation was the rate of degradation of the joint under the loads required to induce strains of target-level strain B (approximately 300 µε)
|
From page 239... ...
240 SSMBLG6-Frosch was fabricated with No. 4 transverse hooks spaced at 18 in., supplemented with No.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.