Experimental and Finite Element Study of Polymer Infilled Tube-in-Tube Buckling Restrained Brace
This study presents a tube-in-tube buckling-restrained brace (BRB) infilled with lightweight and rapid hardening polymer. The proposed BRB consists of a circular or square tube core encased with a tube of similar shape and polymer infill. The tube-in-tube arrangement minimizes the filler material vo...
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MDPI AG
2021-08-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/9/1358 |
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| author | Robel Wondimu Alemayehu Youngsik Kim Min Jae Park Manwoo Park Young K. Ju |
| author_facet | Robel Wondimu Alemayehu Youngsik Kim Min Jae Park Manwoo Park Young K. Ju |
| author_sort | Robel Wondimu Alemayehu |
| collection | DOAJ |
| description | This study presents a tube-in-tube buckling-restrained brace (BRB) infilled with lightweight and rapid hardening polymer. The proposed BRB consists of a circular or square tube core encased with a tube of similar shape and polymer infill. The tube-in-tube arrangement minimizes the filler material volume and enables the use of rolled steel section as opposed to welded profiles commonly utilized when large BRB axial strength is required, although welded profiles suffer from low assembly accuracy resulting from welding deformation. The infilled polymer has a density of approximately half that of mortar and requires a curing time of 24 h, enabling weight and fabrication time reduction. The stability and inelastic deformation capability of the BRB were investigated through brace and subassembly tests of six circular and four-square full-scale specimens, followed by finite element analysis. The test results show that circular BRB designed with a <i>P<sub>cr</sub></i>/<i>P<sub>y</sub></i> ratio of 1.46 exhibited a stable hysteresis up to 1.42% and 1.06% core strain in tension and compression, respectively. Circular and square specimens designed with <i>P<sub>cr</sub></i>/<i>P<sub>y</sub></i> ratios ranging from 0.82 to 1.06 exhibited stable hysteresis before failing by global buckling at compressive core stains ranging from 0.86% to 1.09%. The slot weld detail adopted for welding core projection stiffener displayed a stable performance in circular BRB specimens, while it resulted in large plastic strain demand in square BRB specimens, leading to core fracture at tensile core strains ranging from 0.64% to 0.71%. |
| first_indexed | 2024-03-10T07:27:02Z |
| format | Article |
| id | doaj.art-75b9984658404d488cc340a546efcd20 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T07:27:02Z |
| publishDate | 2021-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-75b9984658404d488cc340a546efcd202023-11-22T14:12:42ZengMDPI AGMetals2075-47012021-08-01119135810.3390/met11091358Experimental and Finite Element Study of Polymer Infilled Tube-in-Tube Buckling Restrained BraceRobel Wondimu Alemayehu0Youngsik Kim1Min Jae Park2Manwoo Park3Young K. Ju4School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, KoreaSchool of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, KoreaSchool of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, KoreaKG Dongbu Steel, Seoul 04637, KoreaSchool of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, KoreaThis study presents a tube-in-tube buckling-restrained brace (BRB) infilled with lightweight and rapid hardening polymer. The proposed BRB consists of a circular or square tube core encased with a tube of similar shape and polymer infill. The tube-in-tube arrangement minimizes the filler material volume and enables the use of rolled steel section as opposed to welded profiles commonly utilized when large BRB axial strength is required, although welded profiles suffer from low assembly accuracy resulting from welding deformation. The infilled polymer has a density of approximately half that of mortar and requires a curing time of 24 h, enabling weight and fabrication time reduction. The stability and inelastic deformation capability of the BRB were investigated through brace and subassembly tests of six circular and four-square full-scale specimens, followed by finite element analysis. The test results show that circular BRB designed with a <i>P<sub>cr</sub></i>/<i>P<sub>y</sub></i> ratio of 1.46 exhibited a stable hysteresis up to 1.42% and 1.06% core strain in tension and compression, respectively. Circular and square specimens designed with <i>P<sub>cr</sub></i>/<i>P<sub>y</sub></i> ratios ranging from 0.82 to 1.06 exhibited stable hysteresis before failing by global buckling at compressive core stains ranging from 0.86% to 1.09%. The slot weld detail adopted for welding core projection stiffener displayed a stable performance in circular BRB specimens, while it resulted in large plastic strain demand in square BRB specimens, leading to core fracture at tensile core strains ranging from 0.64% to 0.71%.https://www.mdpi.com/2075-4701/11/9/1358buckling-restrained bracesubassembly testcomponent testfinite element analysispolymer infilled BRBslot weld |
| spellingShingle | Robel Wondimu Alemayehu Youngsik Kim Min Jae Park Manwoo Park Young K. Ju Experimental and Finite Element Study of Polymer Infilled Tube-in-Tube Buckling Restrained Brace Metals buckling-restrained brace subassembly test component test finite element analysis polymer infilled BRB slot weld |
| title | Experimental and Finite Element Study of Polymer Infilled Tube-in-Tube Buckling Restrained Brace |
| title_full | Experimental and Finite Element Study of Polymer Infilled Tube-in-Tube Buckling Restrained Brace |
| title_fullStr | Experimental and Finite Element Study of Polymer Infilled Tube-in-Tube Buckling Restrained Brace |
| title_full_unstemmed | Experimental and Finite Element Study of Polymer Infilled Tube-in-Tube Buckling Restrained Brace |
| title_short | Experimental and Finite Element Study of Polymer Infilled Tube-in-Tube Buckling Restrained Brace |
| title_sort | experimental and finite element study of polymer infilled tube in tube buckling restrained brace |
| topic | buckling-restrained brace subassembly test component test finite element analysis polymer infilled BRB slot weld |
| url | https://www.mdpi.com/2075-4701/11/9/1358 |
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