Study on Seismic Performance of Single-span Frame Strengthened by Wing-wall

Transcription

1 Vol. 33 No. 1 Feb TU352 A Study on Seismic Performance of Single-span Frame Strengthened by Wing-wall Lin Shu-zhi 1 2 Yuan Xing-ren 1 1. School of Architecture & Civil Engineering Xiamen University Xiamen China 2. Xiamen Construction and Administration Bureau Xiamen China Abstract With lack of redundant constraints single-span frame structure is a weak seismic system and easy to collapse. Since the seismic fortification was enhanced the existing buildings need to be strengthened to improve seismic performance. Wing-wall strengthening has been well concerned for its convenient layout and good bearing capacity but it is unclear how this method would be effective. In this paper the seismic performance of a typical school building strengthened by wing-walls is analyzed and the strengthening effect under various sizes and types of wing-wall is discussed in details. Some questions and suggestions in wing-wall strengthening engineering are also proposed. Keywords single-span frame wing-wall seismic strengthening shuzhi@ public. xm. fj. cn

2 L 2 T mm 1 Fig. 1 Types of wing-wall mm ETABS L T ⅡETABS 3 T g = 0. 35s g 10. 8m 3. 6m C30 C HRB mm 3 Fig. 3 ETABS ETABS mode Fig. 2 2 The layout of structural plan Y X ETABS s s February 2011

3 Table 1 Layout for wing-wall M0 M1 M2 M3 M4 M5 M6 B C 2 14 = 500mm B C = 500mm l 2 = 500mm B C 2 14 = 600mm B C = 600mm l 2 = 600mm B C 2 14 B C l 2 B C 2 14 T B C T l 2 l 3 B C 2 14 T B C T l 2 l 3 = 1000mm B C 2 14 T B C T l 2 l 3 = 1300mm M % 43. 6% M1 M2 M3 M4 M5 M Fig. 4 The trend of structural period Table 2 2 s Structural period s X Y 2 M0 Y M1 M2 M3 θ e 1 /550 X M3 M1 M2 M3 X M % M1 M2 M3 Y % Y X Y T X Y M4 M5 M6 X Y M5 Y Y Y 3

4 Table 3 3 X Y mm Story displacements under X-earthquake and Y-earthquake mm X Y X Y X Y X Y X Y X Y X Y Fig. 5 5 Story displacements under earthquake Table 4 4 X Y Story drifts under X-earthquake and Y-earthquake X Y X Y X Y X Y X Y X Y X Y 3 1 /824 1 /872 1 /937 1 /797 1 /963 1 /783 1 / /769 1 /988 1 /852 1 /984 1 /762 1 /981 1 / /565 1 /483 1 /796 1 /460 1 /857 1 /458 1 /923 1 /457 1 /914 1 /665 1 /912 1 /661 1 /909 1 / /653 1 /548 1 / /535 1 / /534 1 / /542 1 / / / / / / Fig. 6 Story drifts under earthquake February 2011

5 X X Y Y M6 X Y X 10% Table 5 5 X Y kn Story shears under X-earthquake and Y-earthquake kn X Y X Y X Y X Y X Y X Y X Y Fig. 7 7 Story shears under earthquake 3. 4 Pushover X M6 8 6 Fig. 8 8 X Pushover Curve of X direction

6 % mm 0 0M1 Table 6 6 mm mm Window layout for different models mm mm M1 M2 M3 M4 M5 M % mm Table 7 Length of reinforced bars in beams mm M1 M2 M3 M4 M5 M l n 1 /3 900mm l n /12 10% M3 M1 50% Table 8 8 Amount of concrete and reinforced bars M1 M2 M3 M4 M5 M6 m M1 % kg M1 % T 3 2 February 2011

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