پیوندهای مفید
آمار
| تعداد نشریات | 8 |
| تعداد شماره‌ها | 416 |
| تعداد مقالات | 5,492 |
| تعداد مشاهده مقاله | 6,093,237 |
| تعداد دریافت فایل اصل مقاله | 5,345,858 |
Effects of Vertical Deficiency Location on the Structural Behavior of Steel SHS Short Columns | ||
| AUT Journal of Civil Engineering | ||
| مقاله 1، دوره 4، شماره 4، اسفند 2020، صفحه 399-410 اصل مقاله (1.08 M) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/ajce.2018.14940.5507 | ||
| نویسندگان | ||
| Amin Shabani Ammari؛ Kambiz Narmashiri* | ||
| Department of Civil Engineering, Zahedan Branch, Islamic Azad University, Zahedan, Iran | ||
| چکیده | ||
| Structures that face damage require strengthening to reach the initial performance. Strengthening steel Square Hollow Section (SHS) short columns with initial deficiencies were not taken into account appropriately. In this paper, vertical deficiencies with the same dimensions were created at three locations (top, middle, and bottom) on the middle element and the middle of the corner element. Then, the effect of the location of such deficiencies on axial behavior of Carbon Fiber Reinforced Polymer (CFRP) strengthened steel tubular columns was investigated. To this end, a total of nine steel columns were experimentally tested and the same specimens were modeled using ABAQUS V.6.14. In the experimental work, a straight pressure test was performed. In the numerical simulation, three dimensional (3D) simulation method, static gradual loading, and non-linear static analysis were used. The specimens were: no deficiency (Control), four non-strengthened columns with deficiencies at different locations, and four CFRP strengthened specimens having deficiencies. The results showed that vertical deficiencies caused a significant decrease in load-bearing capacity and initial performance. As a result of axial loading, the area of vertical deficiencies experienced local buckling increase and lateral rupture. Local bucking at damaged locations caused the stress concentration, then the axial deformation increased. Vertical deficiencies at the bottom of the middle element caused the most critical conditions. Vertical deficiencies on the corner element led to greater destruction and bearing capacity decline compared to the middle element. Carbon Fiber played a key role in ductility and strength increase around the deficiency by covering it. Using CFRP layers the stress concentration overcame and the local buckling delayed due to high confining strength. | ||
| کلیدواژه‌ها | ||
| Vertical deficiency؛ Steel short column؛ Strengthening؛ SHS؛ CFRP | ||
| مراجع | ||
|
[1] J.G. Teng, Y.M. Hu, Behaviour of FRP-jacketed circular steel tubes and cylindrical shells under axial compression, Construction and Building Materials, 21 (2007) 827–838.
[2] H. Jiao, X.L. Zhao, CFRP strengthened butt-welded very high strength (VHS) circular steel tubes, Thin-Walled Structures, 42(7) (2004), 963-978.
[3] A. Shaat, A. Fam, Axial loading tests on CFRP –retrofitted short and long HSS steel columns, Canadian Journal of Civil Engineering, 33(4) (2006) 458-470.
[4] X.Y. Gao, T. Balender, C.G. Koh, Buckling strength of slender circular tubular steel braces strengthened by CFRP, Engineering Structures 46 (2013) 547-556.
[5] D. He, J. Dong, Q. Wang, X. Chen, Mechanical behaviour of recycled concrete filled steel tube columns strengthened by CFRP, Paper presented at the 2nd International Conference on Multimedia Technology Hangzhou, China, I.P. (2011) 1110-1113.
[6] M.C. Sundarraja, G.G. Prabhu, Experimental study on CFST columns strengthened by CFRP composites under compression, Journal of Constructional Steel Research, 72 (2012) 75–83.
[7] J.F. Dong, Q.Y. Wang, Z.W. Guan, Structural behaviour of recycled aggregate concrete filled steel tube columns strengthened by CFRP, Engineering Structures 48 (2013) 532-542.
[8] P. Feng, Y. Zhang, Y. Bai, L. Ye, Strengthening of steel columns in compression by mortar-filled FRP tubes, Thin Walled Structures, 64 (2013) 1–12.
[9] G.G. Prabhu, M.C. Sundarraja, Behaviour of concrete filled steel tubular (CFST) short columns externally reinforced using CFRP strips composite, Construction & Building Materials, 47 (2013) 1362–1371.
[10] M.R. Bambach, M. Elchalakani, Plastic mechanism analysis of steel SHS strengthened with CFRP under large axial deformation, Thin Walled Structures, 45 (2007) 159–170.
[11] M.R. Bambach, H.H. Jarna, M. Elchalakani, Axial capacity and design of thin-walled steel SHS strengthened with CFRP, Thin-Walled Structures 47 (2009) 1112-1121.
[12] M.R. Bambach, M. Elchalakani, X.L. Zhao, Composite steel-CFRP SHS tubes under axial impact, Composite Structures 87 (2009) 282-92.
[13] M.R. Bambach, H.H. Lama, M. Elchalakani, Static and dynamic axial crushing of spot welded thin-walled composite steel-CFRP square tubes, International Journal of Impact Engineering, 36 (2009) 1083-1093.
[14] J. Haedir, X.L. Zhao, Design of short CFRP-reinforced steel tubular columns, Journal of Constructional Steel Research, 67 (2011) 497–509.
[15] S. Sivasankar, T. Thilakranjith, M.C. Sundarraja, Axial behavior of CFRP jacketed HSS tubular members an experimental investigation, International Journal of Earth Sciences and Engineering, 5(6) (2012) 1729-1737.
[16] S. Kalavagunta, S. Naganathan, K.N. BinMustapha, Proposal for design rules of axially loaded CFRP strengthened cold formed lipped channel steel sections, Thin Walled Structures, 72 (2013) 14–19.
[17] M.C. Sundarraja, S. Sivasankar, Behaviour of CFRP jacketed HSS tubular columns under compression: An experimental investigation, Journal of Structural Engineering, 39(5) (2013) 574–582.
[18] M.R. Ghaemdoust, K. Narmashiri, O. Yousefi, Structural behaviors of deficient steel SHS short columns strengthened using CFRP, Construction and Building Materials, 126 (2016) 1002–1011.
[19] M. Karimian, K. Narmashiri, M. Shahraki, O. Yousefi, Structural behaviors of deficient steel CHS short columns strengthened using CFRP, Journal of Constructional Steel Research, 138 (2017) 555-564. [20] M. Shahraki, M.R. Sohrabi, G.R. Azizyan, K. Narmashiri, Experimental and numerical investigation of strengthened deficient steel SHS columns under axial compressive loads, Structural Engineering and Mechanics: An International Journal, 67(2) (2018) 207-217. [21] R. Shahabi, K. Narmashiri, Effects of deficiency location on CFRP strengthening of steel CHS short columns, Steel and Composite Structures: An International Journal, 28(3) (2018) 267-278. [22] I. Badih Damghani, K. Narmashiri, Strengthening of Deficient Mortar Filled Steel Columns using CFRP, AUT Journal of Civil Engineering, In Persian, )http://dx.doi.org/10.22060/ceej.2018.14560.5684). | ||
|
آمار تعداد مشاهده مقاله: 1,574 تعداد دریافت فایل اصل مقاله: 363 |
||