Study on the Strengthen Method of Masonry Structure by Steel Truss for Collapse Prevention

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1 Vol. 33 No. 2 Apr TU A Study on the Strengthen Method of Masonry Structure by Steel Truss for Collapse Prevention Liao Zi-jian 1 Zhang Peng-cheng 1 Lin Shuzhi 1 2 Xiao Wei 3 1. Department of Civil Engineering Xiamen University Xiamen China 2. Xiamen Construction and Administration Bureau Xiamen China 3. Xiamen Hordor Architecture & Engineering Design Group Co. Ltd. Xiamen China Abstract In the last 30 years of the last century in China a large number of masonry structure has been built which takes up a considerable proportion of the existing dwelling house and school building. So the reconstruction and reinforcement of masonry structures is still in the present era of great significance. A new method to strengthen masonry structures by steel truss for collapse prevention including the assumptions and design principles is proposed and the design process of the method is also given. The result shows that this method can play an important role in improving safety margin of the system and it is an economical and feasible new method for strengthening the existing masonry structure. Keywords collapse prevention steel truss reinforcement of masonry structure safety margin of the system new method zpcchina@ yahoo. com. cn April 2011

2 Fig. 1 Calculation diagram ρ k 2 1 PKPM STS-PK 2 k 0 F 1 Δ a b c V i Fig. 2 2 Calculation model of steel truss Vol. 33 No

3 V ij K ij K ij K i V i V i 2 K ij j 1 j i f ve ζ N f v 8 K ij i K i f v GB ζ N 2 GB V i V ijm V ij + m 1 m 1 k j V ij 3 V ijm i j m V ij i j γ RE m 1 f ve A V ij - 10 m 1 i j m 2 j m V 0jm V + ij m 1 m 1 γ RE k j V ij 4 γ RE V u V V 1. 3V k 6 V f ve A γ RE 7 A f ve V ijm V + ij m 1 m 1 V k ij f ve A 9 j γ RE V 0jm j m a b V V u 5 1 /1000 5mm 1 /1000 April 2011

4 / Fig. 3 3 Cracking but standing masonry structure Fig. 4 Flow chart of the design Vol. 33 No

5 B B α max Table 1 Seismic influence coefficient reduction coefficient G eq n G i 12365kN GB G eq 988kN 7 Ⅱ F EK α max G eq { 0. 11G eq 1360kN mm 600mm 240 MU10 2 M Table 2 2 GB i 1 The horizontal stiffness of the wall and the distribution factor α max F i kn V i kn 1. 3V i kn F i kn V i kn 1. 3V i kn σ MPa ζ N V 11 V V 1 f ve ζ N f v N / mm V u f ve A γ RE kN B 2 V 1j2 1 j V V kN April 2011

6 Fig. 5 5 Floor plan of the brick masonry building 3 Table 3 The horizontal stiffness of the wall and the distribution factor ρ k α < < E < < E < 3. 6 < E γ RE V m 1 V ij - u m 1 Fig. 6 Section plan of the brick masonry building E E E E Vol. 33 No

7 E 1390f 1807MPa mm 5 a 7 a kN 7 b 1 8 k 0 F 3 Fig Δ N / mm E θ Fig. 7 7 Strengthening schemes 1 by steel truss mm 5 b 8 a kN 8 b kg 2372kg k 0 F Δ N / mm E Strengthening schemes 2 by steel truss θ V 0i2 1 5 V V kN V 1j V V kN < V u kN θ April 2011

8 References 1 GB S GB Code for Design of Masonry Structures S in Chinese 2 GB S GB Code for Seismic Design of Buildings S in Chinese 3 GB S GB Code for Building Seismic Appraiser S in Chinese 4 J ~ 50 Ye Lie-ping Qu Zhe Lu Xin-zheng et al. Collapse prevention of building structures a lesson from the Wenchuan earthquake J. Journal of Building Structures ~ 50 in Chinese 5. 4 J ~ 33 Wang Ya-yong. Lessons learnt from building damages in the Wenchuan earthquake three earthquake performance objectives and basic requirements for seismic design of buildings J. Journal of Building 1 /1000 Structures ~ 33 in Chinese 1 / J ~ 15 Ye Lie-ping Cheng Guang-yu Lu Xin-zheng et al. Introduction of robustness for seismic structures J. Building Structure ~ 15 in Chinese 7. J ~ 638 Liu Xiao-feng Cai Xian-hui Cheng Geng-dong. Earthquake damage of masonry buildings and anchoragetie strengthening method for rural houses J. Journal of Dalian University of Technology ~ 638 in Chinese 8. J ~ 43 in Chinese Liu Hai-qing Ni Zhen-guo Ou Jin-ping. Simulation analysis of the collapse response of masonry structures subjected to strong ground motion J. Journal of Earthquake Engineering and Engineering Vibration ~ 43 in Chinese 9 JGJ S. JGJ Technical Specification for Seismic Strengthenng of Building S in Chinese 1984 ~ Vol. 33 No

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