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Feasibility of novel SMA-CFRP retrofit system for fatigue strengthening of steel structures
| Content Provider | Scilit |
|---|---|
| Author | Lv, Zhilin Zhang, Guanhua Jiang, Xu Wu, Xinyi Qiang, Xuhong Dai, Shaolei |
| Copyright Year | 2021 |
| Description | Book Name: Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations |
| Abstract | Steel structures, like steel bridges, may be suffered from fatigue damage because of the increasing heavy traffic loading. In this case, the immediate need is to find an effective reinforcement method. It has been demonstrated that using the prestressed carbon fiber reinforced polymers (CFRP) can be an effective alternative to improve the service life of fatigue-damaged metallic structures. Nevertheless, prestressing these retrofit system commonly requires hydraulic actuators and pumps, and complex anchor system and installations, which is impractical in many applications. As a novel strengthening method, the application of shape memory alloys (SMAs) has arose considerate attention in the field of civil engineering. This smart material can undergo large deformations but can regain the original shape after being subjected to heat (shape memory effect), which can be used as a prestressing system for fatigue rehabilitation of steel structures. Therefore, this paper proposed an innovative SMA-CFRP hybrid retrofit system with the continuous hooked anchorages for strengthening of fatigue cracked-steel plates. By restraining the shape memory effect (SME) of NiTiNb SMA wires, prestressing recovery forces can be generated in the SMAs and further progression of the cracks can be arrested by developing residual compressive stresses close to crack tips. In the first step, tensile tests were performed to characterize the material’s mechanical properties (limit of proportionality, yield, and tensile strength and elongation) as well as the recovery behavior of the SMA wires. In the second step, a series of lap-shear tests was conducted to investigate the bonding and slipping performance of the SMA wires pulling out from the adhesive. The test results showed that there is a reliable bond strength between the SMA wires and CFRP overlay. And the proposed continuous hooked anchorages can offer adequate bond anchorage force. These experiments demonstrated the feasibility study on the application of shape memory effect of NiTiNb SMA wires for prestressed strengthening of steel plates, which lays the foundation for the further study. |
| Related Links | https://api.taylorfrancis.com/content/chapters/edit/download?identifierName=doi&identifierValue=10.1201/9780429279119-193&type=chapterpdf |
| Ending Page | 1423 |
| Page Count | 7 |
| Starting Page | 1417 |
| DOI | 10.1201/9780429279119-193 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2021-04-19 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Bridge Maintenance, Safety, Management, Life-cycle Sustainability and Innovations Civil Engineering Structures Sma Cfrp Steel Plates Nitinb Sma Application of Shape Continuous Hooked Anchorages |
| Content Type | Text |
| Resource Type | Chapter |
