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| fabformwiki:research:proposals_researcher1 [2023/10/11 19:43] – [Phase I – Proof of Concept] rpschmitz | fabformwiki:research:proposals_researcher1 [2023/10/19 15:54] (current) – [External Links] rpschmitz |
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| - <fs medium>New fabrics with improved properties over those of geotextiles even more suited for use as a formwork component.</fs> | - <fs medium>New fabrics with improved properties over those of geotextiles even more suited for use as a formwork component.</fs> |
| - <fs medium>Improved analytical tools for form-finding using finite element structural analysis software.</fs> | - <fs medium>Improved analytical tools for form-finding using finite element structural analysis software.</fs> |
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| ===== Proposed Research ===== | ===== Proposed Research ===== |
| * <fs medium>3. Can a flexible fabric formwork be used to design concrete members in a manner that would be practical and useful to the design community?</fs> | * <fs medium>3. Can a flexible fabric formwork be used to design concrete members in a manner that would be practical and useful to the design community?</fs> |
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| ==== Phase I – Proof of Concept ==== | ==== Phase I – Proof of Concept ==== |
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| - load cell at each corner of test frame | - load cell at each corner of test frame |
| - Panels loaded and unloaded for three (3) cycles | - Panels loaded and unloaded for three (3) cycles |
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| ==== Phase II – Proof of Concept ==== | ==== Phase II – Proof of Concept ==== |
| <fs large>** – Fabric as a //Concrete// Load Carrying Component**</fs> | <fs large>** – Fabric as a //Concrete// Load Carrying Component**</fs> |
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| <align justify><fs medium>Using a test frame setup similar to that used for Phase I tests will be conducted on complex shaped panels with the fabric formwork placed into two states, taut and prestressed. The complex wall panel will introduce interior support points for the fabric. Deflection of the fabric will be monitor using deflection gages (deflectometers). Relaxation of the geotextile fabric formwork under the prestressed state and under load will again be monitored using the photogrammetric technique described above.</fs></align> | ### |
| | <fs medium>Using a test frame setup similar to that used for Phase I tests will be conducted on complex shaped panels with the fabric formwork placed into two states, taut and prestressed. The complex wall panel will introduce interior support points for the fabric. Deflection of the fabric will be monitor using deflection gages (deflectometers). Relaxation of the geotextile fabric formwork under the prestressed state and under load will again be monitored using the photogrammetric technique described above.</fs> |
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| <align justify><fs medium>For this phase a plain concrete mix design will be utilized. After each test is completed the panels will be unloaded and the fabric allowed to return to its original state. The reason for this is to determine whether the fabric can produce results that are consistent and repeatable. This will aid in determining whether the fabric may be __**cleaned and reused**__.</fs></align> | ### |
| | <fs medium>For this phase a plain concrete mix design will be utilized. After each test is completed the panels will be unloaded and the fabric allowed to return to its original state. The reason for this is to determine whether the fabric can produce results that are consistent and repeatable. This will aid in determining whether the fabric may be __**cleaned and reused**__.</fs> |
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| <align justify><fs medium>Results from the experimental testing will be compared with those obtained from an analytical analysis using the finite element analysis program //ADINA//. Of interest here will be how well the experimental model compares with the analytical model in terms of:</fs></align> | ### |
| | <fs medium>Results from the experimental testing will be compared with those obtained from an analytical analysis using the finite element analysis program //ADINA//. Of interest here will be how well the experimental model compares with the analytical model in terms of:</fs> |
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| * <fs medium>The total volume of concrete in the final panel shape.</fs> | * <fs medium>The total volume of concrete in the final panel shape.</fs> |
| * <fs medium>Deflection of the fabric and thus the thickness of the panel at selected panel points.</fs> | * <fs medium>Deflection of the fabric and thus the thickness of the panel at selected panel points.</fs> |
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| <align justify><fs medium>The temperature the concrete reaches during the heat of hydration will also be of interest. Levels above 100° F (37.8° C) are known to accelerate creep in geotextile fabrics [7]. Creep in the fabric and thus an increase in deflection may cause micro-cracking in the plastic concrete panel and thus have an adverse affect on its appearance, durability and performance.</fs></align> | ### |
| | <fs medium>The temperature the concrete reaches during the heat of hydration will also be of interest. Levels above 100° F (37.8° C) are known to accelerate creep in geotextile fabrics [7]. Creep in the fabric and thus an increase in deflection may cause micro-cracking in the plastic concrete panel and thus have an adverse affect on its appearance, durability and performance.</fs> |
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| <fs medium>Testing breakdown:</fs>\\ | <fs medium>Testing breakdown:</fs>\\ |
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| ==== Phase III – Proof of Concept ==== | ==== Phase III – Proof of Concept ==== |
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| <fs large>** – Fabric Used to Form a //Practical// Load Carrying Component**</fs> | <fs large>** – Fabric Used to Form a //Practical// Load Carrying Component**</fs> |
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| <align justify><fs medium>For this phase of the project full-scale concrete wall panels will be designed, constructed and tested for lateral load carrying capacity. The results of control panels constructed using plain concrete will be compared with those reinforced with steel or fiberglass reinforced polymer (FRP) reinforcing bars. Results from the experimental testing will be compared with those obtained from an analytical analysis using the finite element analysis program //ADINA//.</fs></align> | |
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| <align justify><fs medium>Aesthetics may play a large role in the acceptance and desirability of these fabric-formed panels but one of the key issues we will wish to address is that of efficiency. To that end the theoretical capacity of a normally reinforced concrete panel formed in a rigid formwork will be compared to the theoretical capacity of the fabric-formed panel using the FEA program //ADINA//. Experimental capacities from our test results will also be compared with the theoretical results.</fs></align> | |
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| <align justify><fs medium>Figure 6 shows the analytical model after form-finding and Figure 7 shows the load cases. The complex wall panel will introduce interior supports for the fabric. </fs></align> | ### |
| | <fs medium>For this phase of the project full-scale concrete wall panels will be designed, constructed and tested for lateral load carrying capacity. The results of control panels constructed using plain concrete will be compared with those reinforced with steel or fiberglass reinforced polymer (FRP) reinforcing bars. Results from the experimental testing will be compared with those obtained from an analytical analysis using the finite element analysis program //ADINA//.</fs> |
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| | <fs medium>Aesthetics may play a large role in the acceptance and desirability of these fabric-formed panels but one of the key issues we will wish to address is that of efficiency. To that end the theoretical capacity of a normally reinforced concrete panel formed in a rigid formwork will be compared to the theoretical capacity of the fabric-formed panel using the FEA program //ADINA//. Experimental capacities from our test results will also be compared with the theoretical results.</fs> |
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| | <fs medium>Figure 6 shows the analytical model after form-finding and Figure 7 shows the load cases. The complex wall panel will introduce interior supports for the fabric. </fs> |
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| {{gallery> fabwiki:research:usa:usa_schmitz:research_proposal:fig_6-7?300x200&6&showtitle&lightbox }} | {{gallery> fabformwiki:research:usa:usa_schmitz:research_proposal:fig_6-7?300x200&6&showtitle&lightbox }} |
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| <fs medium>Testing breakdown:</fs>\\ | <fs medium>Testing breakdown:</fs>\\ |
| **<fs large>Testing Difficulties</fs>** | **<fs large>Testing Difficulties</fs>** |
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| <align justify><fs medium>For Phase III testing of full-scale concrete wall panels may be difficult given the capacities of the vacuum chamber equipment we are able to configure. While it would be preferred to test a full-scale panel similar to one that would be used in a practical application it is believed that acceptable results and conclusions will be obtained from scaled down panels as well.</fs></align> | |
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| | <fs medium>For Phase III testing of full-scale concrete wall panels may be difficult given the capacities of the vacuum chamber equipment we are able to configure. While it would be preferred to test a full-scale panel similar to one that would be used in a practical application it is believed that acceptable results and conclusions will be obtained from scaled down panels as well.</fs> |
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| ===== See Also ===== | ===== See Also ===== |
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