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Study on the Strengthening of Prestressed Concrete Box-Girder Bridges Using Concrete-Filled Steel Tube Truss
https://orcid.org/0000-0002-6621-5982
https://orcid.org/0000-0003-2226-1618
In response to the issue of reduced transverse connection strength (TCS) in box-girder bridges, this paper presented a technique using a concrete-filled steel tube truss (CFSTT) to improve the transfer of loads between girders. The Euclidean norm-deflection method was proposed to address the challenge of quantitatively evaluating TCS, which existing methods struggle with. The effectiveness of these approaches was evaluated based on experiments and simulations. Static loading experiments revealed reductions of 14.29% and 18.99% in the deflection and strain, respectively. Under the moving loads, the deflection was reduced by approximately 21.80% and remained unaffected by the velocity. In addition, there was a slight increase (about 5.90%) in the ultimate load of the strengthening model, whereas the failure mode and damage evolution were almost unaffected. However, the strengthening effect was influenced by factors such as the initial damage ratio (IDR), overloading ratio (OR), and CFSTT quantity. When the IDR exceeds 10%, the initial damage affects the strengthening effect. The TCS increased when the OR was below 50% but decreased when it surpassed this threshold. However, CFSTT could sustain its strengthening effect for ORs below 100%. As CFSTT quantity increased, the maximum deflection of the bridge initially decreased and then increased, suggesting that increasing CFSTT quantity did not necessarily enhance strengthening effectiveness. Therefore, there might be an optimal quantity for specific bridges. Finally, the long-term monitoring results demonstrated that over a 60-month monitoring period, the maximum strain reduction rate of the strengthening bridge changed by 3%, indicating the durability of the CFSTT strengthening method.
Study on the Strengthening of Prestressed Concrete Box-Girder Bridges Using Concrete-Filled Steel Tube Truss
https://orcid.org/0000-0002-6621-5982
https://orcid.org/0000-0003-2226-1618
In response to the issue of reduced transverse connection strength (TCS) in box-girder bridges, this paper presented a technique using a concrete-filled steel tube truss (CFSTT) to improve the transfer of loads between girders. The Euclidean norm-deflection method was proposed to address the challenge of quantitatively evaluating TCS, which existing methods struggle with. The effectiveness of these approaches was evaluated based on experiments and simulations. Static loading experiments revealed reductions of 14.29% and 18.99% in the deflection and strain, respectively. Under the moving loads, the deflection was reduced by approximately 21.80% and remained unaffected by the velocity. In addition, there was a slight increase (about 5.90%) in the ultimate load of the strengthening model, whereas the failure mode and damage evolution were almost unaffected. However, the strengthening effect was influenced by factors such as the initial damage ratio (IDR), overloading ratio (OR), and CFSTT quantity. When the IDR exceeds 10%, the initial damage affects the strengthening effect. The TCS increased when the OR was below 50% but decreased when it surpassed this threshold. However, CFSTT could sustain its strengthening effect for ORs below 100%. As CFSTT quantity increased, the maximum deflection of the bridge initially decreased and then increased, suggesting that increasing CFSTT quantity did not necessarily enhance strengthening effectiveness. Therefore, there might be an optimal quantity for specific bridges. Finally, the long-term monitoring results demonstrated that over a 60-month monitoring period, the maximum strain reduction rate of the strengthening bridge changed by 3%, indicating the durability of the CFSTT strengthening method.
Study on the Strengthening of Prestressed Concrete Box-Girder Bridges Using Concrete-Filled Steel Tube Truss
https://orcid.org/0000-0002-6621-5982
https://orcid.org/0000-0003-2226-1618
In response to the issue of reduced transverse connection strength (TCS) in box-girder bridges, this paper presented a technique using a concrete-filled steel tube truss (CFSTT) to improve the transfer of loads between girders. The Euclidean norm-deflection method was proposed to address the challenge of quantitatively evaluating TCS, which existing methods struggle with. The effectiveness of these approaches was evaluated based on experiments and simulations. Static loading experiments revealed reductions of 14.29% and 18.99% in the deflection and strain, respectively. Under the moving loads, the deflection was reduced by approximately 21.80% and remained unaffected by the velocity. In addition, there was a slight increase (about 5.90%) in the ultimate load of the strengthening model, whereas the failure mode and damage evolution were almost unaffected. However, the strengthening effect was influenced by factors such as the initial damage ratio (IDR), overloading ratio (OR), and CFSTT quantity. When the IDR exceeds 10%, the initial damage affects the strengthening effect. The TCS increased when the OR was below 50% but decreased when it surpassed this threshold. However, CFSTT could sustain its strengthening effect for ORs below 100%. As CFSTT quantity increased, the maximum deflection of the bridge initially decreased and then increased, suggesting that increasing CFSTT quantity did not necessarily enhance strengthening effectiveness. Therefore, there might be an optimal quantity for specific bridges. Finally, the long-term monitoring results demonstrated that over a 60-month monitoring period, the maximum strain reduction rate of the strengthening bridge changed by 3%, indicating the durability of the CFSTT strengthening method.
Study on the Strengthening of Prestressed Concrete Box-Girder Bridges Using Concrete-Filled Steel Tube Truss
J. Bridge Eng.
Hou, Peng (Autor:in) / Yang, Caiqian (Autor:in) / Yang, Jing (Autor:in) / Pan, Yong (Autor:in)
01.11.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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