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札露车
7 years ago
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1 CHINA CIVIL ENGINEERING JOURNAL Vol. 46 Jul. No BJJQ RC RC RC RC RC 66. 9% FEMA356 Perform-3D RC TU A X Seismic performance of existing RC frame structures reinforced with buckling-restrained braces Wu Hui Zhang Guowei Zhao Jian Zhang Yang Beijing Higher Institution Engineering Research Center of Civil Engineering Structure and Renewable Material Beijing University of Civil Engineering and Architecture Beijing China Abstract A two-storey RC-frame-structure model is designed as a substructure of an existing eight-storey RC building built in late 1970s. It is respectively reinforced with two buckling-restrained-braces frames by means of embedded bars and shear connectors respectively on the middle span of the three-span RC model structure on both sides. Pseudo-static cyclic loading tests were carried out on the model frame substructure. The test results show that the two connecting methods of buckling-restrained braced frame perform well together with the existing frame structure under cyclic loading and buckling-restrained braces increase the seismic performance of model structure and seismic energy to the structures during earthquake is mainly absorbed by buckling-restrained braces leading to less damage to structure elements. The test result shows that more than 66. 9% seismic energy is absorbed by buckling-restrained braces. Nonlinear analysis of the frame structure is conducted by the program Perform-3D and the computation results agree well with the tested ones. Keywords buckling-restrained brace adhesive anchorage pseudo-static test seismic performance RC frame wuhui@ bucea. edu. cn 20 Buckling-Restrained Brace BRB 80 Buckling-Restrained Brace Frame BRBF 2008-K2-17

2 mm 110mm BRBF 4 HRB400 14mm mm MPa MPa BRBF BRBF BRB BRBF Fig. 1 1 Dormitory building before and after retrofitting TJ C23 C25 HPB235 HRB mm 1300mm 230mm 230mm 4 HRB400 14mm

3 46 7 RC mm 230mm 6 14mm HRB400 50mm 4 HPB235 a 230mm 150mm 280mm 6 HRB400 4 b 14mm C MPa 6 14 HRB mm HRB mm 4 a ~ 4 d mm 14mm 75mm 50mm 50mm mm 14mm Ⅲ 3 200mm 150mm 52 KIT mm 3

4 Fig. 3 Location of the embedded bars BRB BRB 2 Q M18 18 BRB BRB BRB BRB 8 8 BRB 425mm 2 120kN 1. 2mm BRB 1 13mm 3. 6% 7 Q235

5 46 7 RC 41 1 Table 1 Design parameters of BRB specimen mm BRB-D D1 D2 D3 D4 4 BRB D5 D6 D7 D8 D9 D10 D11 D12 D13 D BRB 2. 3 JGJ t 1600kN 8 200t 100t

6 kN Δ y 2Δ y 3Δ y 3 Fig mm C2 35cm 20cm 9 Test set-up C7 2 2 C2 5cm 20cm C1 C2 8cm C3 1 15cm 10cm 3cm C mm C1 C2 15cm C2 8cm C cm C2 C3 Fig. 10 Photo of test set-up 2 10cm C4 15cm C3 10cm 2 1 ± 150kN ± 300kN ± 450kN ± 600kN 4 8 ± 750kN 660kN 20mm C1 C2 C2 BRB 1. 2mm C2 C3 Δ y BRB kN BRB mm C4 C3 C4 C2 C8 1mm C1 C2

7 46 7 RC 43 C mm 1 /50 C3 C4 RC3 RC4 15cm C6 C7 6mm B4 RB1 4mm Fig Damage on elements of the model structure during test mm 8. 4mm 1 /50 BRB BRB /50 13mm RC 10. 3mm BRB 1700kN 3 4 RC BRB

8 Δ BRB % CSI Perform-3D 22 16Δ BRB 66. 9% 12Δ FEMA Beam /Column 23 Concrete Type BRB BRB 14 BRB

9 46 7 RC % 1 Tremblay R Bolduc P Neville R et al. Seismic testing - and performance of buckling-restrained bracing systems 3 J. Canadian Journal of Civil Engineering Fahnestock L A Sause R Ricles J M. Seismic response and performance of buckling-restrained braced frames J. Journal of Structural Engineering Fahnestock L A Ricles J M Sause R. Experimental evaluation of a large-scale buckling-restrained braced frame J. Journal of Structural Engineering Berman J W Bruneau M. Cyclic testing of a buckling restrained braced frame with unconstrained gusset connections J. Journal of Structural Engineering J Fig. 15 Comparison between test result of and analysis Gu Luzhong Gao Xiangyu Xu Jianwei et al. Experimental research on seismic performance of BRB 4 concrete frames J. Journal of Building Structures in Chinese 6. M Saiful I Wu Hui. Seismic retrofit of a 14-story suspended floor building using advanced analysis and energy dissipation devices C / / Seventh U. S. National Conference on 1 Earthquake Engineering. Boston Mass Saiful I Huang S C Wu Hui. Seismic retrofit of a nonductile concrete building using Buckling Restrained Brace Frame BRBF C / / SEAOC 2004 Convention Proceedings. Monterey California TJ J Li Guoqiang Gong Hai Zhang Yang et al. Study on key technologies of TJ buckling restrained braces in strengthening projects J. Journal of Building Structures S in Chinese 10. C / / Q235 J / Gao Xiangyu Du Haiyan Zhang Hui et al. 4 Experimental study on seismic performance of bucklingrestrained brace made of Q235 hot-rolled steel in China J. Journal of Building Structures

10 in Chinese 12. C / / structures S. Beijing China Planning Press 2003 in 12 ASSF Zhao Jian Wu Hui. Experiment study on Buckling-Restrained Braced Reinforced Concrete Frame C / /Proceedings of the 3rd International Conference on Contemporary Problems in Architecture and Construction GB Code for design of steel Chinese 19 JGJ S JGJ Specification of testing methods for earthquake resistant building S. Beijing China Architecture & Building Press 1997 in Chinese 14 TJ S GB S GB Code for seismic J Yu Zhiwu Luo Xiaoyong. Experimental research on aseismic properties of unbonded design of buildings S. Beijing China Architecture & P. C. frame under horizontal low cyclic loading J. Building Press 2010 in Chinese 16 GB S GB Code for design of concrete structures S. Beijing China Architecture & Building Press 2002 in Chinese 17 JGJ S JGJ Technical Journal of Building Structures in Chinese 21. J Computers and Structures Inc.. Perform-3D v OL. US Computers and Structures Inc specification for post-installed fastenings in concrete 23. structures S. Beijing China Architecture & Building Press 2005 in Chinese PERFORM-3D J GB S

Fig. 1 Frame calculation model 1 mm Table 1 Joints displacement mm

Fig. 1 Frame calculation model 1 mm Table 1 Joints displacement mm 33 2 2011 4 ol. 33 No. 2 Apr. 2011 1002-8412 2011 02-0104-08 1 1 1 2 361003 3. 361009 3 1. 361005 2. GB50023-2009 TU746. 3 A Study on Single-span RC Frame Reinforced with Steel Truss System Yuan Xing-ren