Re Entrant Corner Crack
2021年6月26日Download here: http://gg.gg/v53dq
*Reentrant Corner Check
*Reentrant Corner Image
This paper examines cracks which occurred at the re-entrant corners at the dapped ends of bulb tee girders used on the MIA Mover APM System at Miami International Airport. Cracks were initially identified during load testing at the precast yard, although typically they did not occur until the beams were erected. The load test and crack mechanism is described herein. Post-erection cracking is compared with that observed under load test conditions and differences are discussed. FDOT criteria were applied in determining the appropriate protection strategy.
*Record URL: https://doi.org/10.1061/41193(424)14
*Availability:
*Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784411933
*Supplemental Notes:
*Copyright © 2011 ASCE
*Authors:
*Leverenz, David G.
*Davidson, Thomas E.
*Conference:
*Location: Paris , France
*Date: 2011-5-22 to 2011-5-25
*Publication Date: 2011
The first crack initiated at the re-entrant corner A at about 20 percent of ultimate. This crack propagated at approximately 45 deg to the horizontal, and at service load extended to about two-thirds the height of the nib. At this time additional diagonal ten- sion cracks occurred in the nib and in the full depth beam, as shown in Fig. Re-entrant corners. Re-entrant corners are corners that point into a slab. For example, if one were to pour concrete around a square column, he would create four re-entrant corners. Because the concrete cannot shrink around a corner, the stress will cause the concrete to crack from the point of that corner (See Figure 1). Placed at 45 degrees to the re-entrant corner with nominal top cover. The crack control measures are there to arrest the crack opening and not prevent crack formation. It is the job of isolation detailing and joint positioning to reduce the risk of crack formation at re-entrant corners. Re-entrant corners are corners that point into a slab. For example, if one were to pour concrete around a square column, you would create four re-entrant corners. Because the concrete cannot shrink around a corner, the stress will cause the concrete to crack from the point of that corner (See Figure 1).
Errors in design and detailing that may result in unacceptable cracking include use of poorly detailed reentrant corners in walls, precast members and slabs, improper selection and/or detailing of reinforcement, restraint of members subjected to volume changes caused by variations in temperature and moisture, lack of adequate contraction joints, and improper design of foundations, resulting in differential movement within the structure.Language
*EnglishReentrant Corner CheckMedia Info
*Media Type: Web
*Monograph Title: Proceedings of the Thirteenth International Conference on Automated People Movers and Transit Systems, 2011Subject/Index Terms
*TRT Terms: Load tests; People movers; Precast concrete
*Identifier Terms: Miami International Airport
*Uncontrolled Terms: Bulbtee girders
*Geographic Terms: Florida
*Subject Areas: Maintenance and Preservation; Filing Info
*Accession Number: 01365047
*Record Type: Publication
*ISBN: 9780784411933
*Files: TRIS, ASCE
*Created Date: Nov 29 2011 3:00PM
Typical Creo Elements models have many inside or re-entrant corners. In the real world you could not build a part with perfect sharp inside corners. Red dead redemption download for mac. There will always be some radius resulting from the tooling used to make the part. Sometimes fillets are left off the CAD parts and are specified in the drawing notes. In the FEA world re-entrant corners are a bad thing. These represent an infinite change in stiffness inside the part, which will result in an infinite stress concentration. The MPA convergence algorithm will not converge on infinity and the SPA algorithm will ignore any elements touching a re-entrant corner during its error estimation. The resulting stress convergence plot will be a line that continues to increase without ever starting to reach an asymptote.
If this is a problem in your Creo Simulate model you should probably ask the question “Is this a good design having the highest stress in the model at a re-entrant corner?” The answer may be ‘yes’ if the material is ductile and fatigue loading is not an issue. If this is true and you are planning to ignore this stress just add a small fillet to prevent a convergence problem or use the ‘Isolate for Exclusion’ option under Mesh Control. Otherwise you may want to rethink the design.
Theoretically re-entrant corners should always cause a problem for convergence, however, due to the coarseness of the error estimation process re-entrant corner convergence problems generally only show up in higher stress areas of the model.Reentrant Corner Image
Other similar stiffness discontinuity problems are shown below.
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Download here: http://gg.gg/v53dq
https://diarynote.indered.space
*Reentrant Corner Check
*Reentrant Corner Image
This paper examines cracks which occurred at the re-entrant corners at the dapped ends of bulb tee girders used on the MIA Mover APM System at Miami International Airport. Cracks were initially identified during load testing at the precast yard, although typically they did not occur until the beams were erected. The load test and crack mechanism is described herein. Post-erection cracking is compared with that observed under load test conditions and differences are discussed. FDOT criteria were applied in determining the appropriate protection strategy.
*Record URL: https://doi.org/10.1061/41193(424)14
*Availability:
*Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784411933
*Supplemental Notes:
*Copyright © 2011 ASCE
*Authors:
*Leverenz, David G.
*Davidson, Thomas E.
*Conference:
*Location: Paris , France
*Date: 2011-5-22 to 2011-5-25
*Publication Date: 2011
The first crack initiated at the re-entrant corner A at about 20 percent of ultimate. This crack propagated at approximately 45 deg to the horizontal, and at service load extended to about two-thirds the height of the nib. At this time additional diagonal ten- sion cracks occurred in the nib and in the full depth beam, as shown in Fig. Re-entrant corners. Re-entrant corners are corners that point into a slab. For example, if one were to pour concrete around a square column, he would create four re-entrant corners. Because the concrete cannot shrink around a corner, the stress will cause the concrete to crack from the point of that corner (See Figure 1). Placed at 45 degrees to the re-entrant corner with nominal top cover. The crack control measures are there to arrest the crack opening and not prevent crack formation. It is the job of isolation detailing and joint positioning to reduce the risk of crack formation at re-entrant corners. Re-entrant corners are corners that point into a slab. For example, if one were to pour concrete around a square column, you would create four re-entrant corners. Because the concrete cannot shrink around a corner, the stress will cause the concrete to crack from the point of that corner (See Figure 1).
Errors in design and detailing that may result in unacceptable cracking include use of poorly detailed reentrant corners in walls, precast members and slabs, improper selection and/or detailing of reinforcement, restraint of members subjected to volume changes caused by variations in temperature and moisture, lack of adequate contraction joints, and improper design of foundations, resulting in differential movement within the structure.Language
*EnglishReentrant Corner CheckMedia Info
*Media Type: Web
*Monograph Title: Proceedings of the Thirteenth International Conference on Automated People Movers and Transit Systems, 2011Subject/Index Terms
*TRT Terms: Load tests; People movers; Precast concrete
*Identifier Terms: Miami International Airport
*Uncontrolled Terms: Bulbtee girders
*Geographic Terms: Florida
*Subject Areas: Maintenance and Preservation; Filing Info
*Accession Number: 01365047
*Record Type: Publication
*ISBN: 9780784411933
*Files: TRIS, ASCE
*Created Date: Nov 29 2011 3:00PM
Typical Creo Elements models have many inside or re-entrant corners. In the real world you could not build a part with perfect sharp inside corners. Red dead redemption download for mac. There will always be some radius resulting from the tooling used to make the part. Sometimes fillets are left off the CAD parts and are specified in the drawing notes. In the FEA world re-entrant corners are a bad thing. These represent an infinite change in stiffness inside the part, which will result in an infinite stress concentration. The MPA convergence algorithm will not converge on infinity and the SPA algorithm will ignore any elements touching a re-entrant corner during its error estimation. The resulting stress convergence plot will be a line that continues to increase without ever starting to reach an asymptote.
If this is a problem in your Creo Simulate model you should probably ask the question “Is this a good design having the highest stress in the model at a re-entrant corner?” The answer may be ‘yes’ if the material is ductile and fatigue loading is not an issue. If this is true and you are planning to ignore this stress just add a small fillet to prevent a convergence problem or use the ‘Isolate for Exclusion’ option under Mesh Control. Otherwise you may want to rethink the design.
Theoretically re-entrant corners should always cause a problem for convergence, however, due to the coarseness of the error estimation process re-entrant corner convergence problems generally only show up in higher stress areas of the model.Reentrant Corner Image
Other similar stiffness discontinuity problems are shown below.
Inpage urdu 2007 free filehippo. Dec 03, 2019 Here you can Download free Inpage 2000, Inpage 2004, Inpage 2007, Inpage 2009, 2010, 2012, 2014, 2015 Inpage 2018 full version for pc windows XP, Windows 7, Windows 8 and 10 32-bit and 64-bit.
Download here: http://gg.gg/v53dq
https://diarynote.indered.space
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