| Author: | Tian, Han |
| Title: | Cyclic behavior of high strength steel Q690 under low cycle high strain cyclic tests |
| Advisors: | Supervisor : Chung, K. F. (CEE) |
| Degree: | M.Sc. |
| Year: | 2016 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Steel, High strength -- Testing |
| Department: | Faculty of Construction and Environment |
| Pages: | v, 54 pages : color illustrations |
| Language: | English |
| Abstract: | High strength steel is increasingly used in construction due to its high strength to self-weight ratio. However, its ductility decreases with an increase in the strength. It should be noted that ductility plays an important role when it is subjected to extreme loadings, such as earthquakes. This dissertation presents an investigation into deformation characteristics of Q690 steel under cyclic loads. Six reference tensile tests are conducted to determine its mechanical properties, and twelve cyclic tests are also conducted to examine the hysteretic behavior under a standardized low cycle high strain cyclic test. It is found that all the test specimens are able to develop plastic deformations up to 10% strain. Moreover, the strengths at 10% strain are found to be 0.85 of their yield strengths. Hence, the Q690 steel will not lose its strength significantly at a large deformation of 10%. The proposed method is able to make an assessment on the cyclic behavior of the Q690 steel. Structural engineers are thus encouraged to take advantage of high strength steel materials in seismic resistant design. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 991022142758003411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.57 MB | Adobe PDF | View/Open |
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