Experimental study on seismic deformation index limits of T-shaped RC shear walls

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1 JOURNAL OF HARBIN INSTITUTE OF TECHNOLOGY Vol 50 No 6 Jun 2018 DOI /jissn T RC T RC 12 T RC 12 6 T RC T RC T RC T RC T TU375 A Experimental study on seismic deformation index limits of T-shaped RC shear walls CHEN Binbin 1 JI Jing 1 2 XIE Shunguang 1 HAN Xiaolei 1 2 LU Huaikun 1 CUI Jidong 1 1School of Civil Engineering and Transportation South China University of Technology Guangzhou China 2State Key Laboratory of Subtropical Building Science South China University of TechnologyGuangzhou China Abstract To investigate the seismic performance and deformation index limits twelve T - shaped reinforced concrete RC shear walls with different shear span ratios design axial compression ratios and longitudinal reinforcement ratios of boundary element were designed according to Chinese current codes The specimens were tested under low frequency cyclic loading to study the seismic behaviors such as failure pattern hysteretic characteristic energy dissipation capacity and deformation capacity According to the test results corresponding deformation index limits of six performance states were obtained with two methods based on skeleton curve and experimental phenomena Regression analysis was conducted with collected experimental results to build the correlations of deformation index limits at different performance states and shear span ratios design axial compression ratios and longitudinal reinforcement ratios of boundary element The results show that the failure patterns of specimens are transformed from flexural failure to flexural-shear failure with the decrease of shear span ratio It is reasonable and feasible to establish the relationship between deformation index limits and damage extents of T-shaped RC shear walls based on skeleton curve While the deformation index limit has positive correlations with shear span ratio and longitudinal reinforcement ratio of boundary element there is a negative correlation between deformation index limit and design axial compression ratio Keywords reinforced concrete T - shaped shear wall low frequency cyclic loading test performance-based design deformation index limit regression analysis RC T RC Thomsen 2 Sittipunt 3 Palermo 4 T RC RC 1 T 5-6 T ZA cvjingji@ scuteducn T 10 T

6 T RC 65 1 11-12 RC 11 T 13 T 14 12 T RC 400 mm 130 mm 720 mm 130 mm H 1 300 mm 12 T RC 1 700 mm 2 200 mm 165 212 271 λ 0 2 0 5 n 155% 242% ρ 12 TW1 ~ TW12 12 T RC 1 1 2 3 Tab1 1 Parameters of

8@ 80 6@ 125 8@ 125 212 02 TW6 2 10 10 242% 8@ 80 6@ 125 8@ 125 212 02 TW7 2 10 8 155% 8@ 80 6@ 125 8@ 125 212 05 TW8 2 10 10 242% 8@ 80 6@ 125 8@ 125 212 05 TW9 2 10 8 155% 8@ 80 6@ 125 8@ 125 271

2 6 T RC RC 11 T 13 T T RC 400 mm 130 mm 720 mm 130 mm H mm 12 T RC mm mm λ n 155% 242% ρ 12 TW1 ~ TW12 12 T RC Tab1 1 Parameters of specimens TW % 8@ 80 6@ 125 8@ TW % 8@ 80 6@ 125 8@ TW % 8@ 80 6@ 125 8@ TW % 8@ 80 6@ 125 8@ TW % 8@ 80 6@ 125 8@ TW % 8@ 80 6@ 125 8@ TW % 8@ 80 6@ 125 8@ TW % 8@ 80 6@ 125 8@ TW % 8@ 80 6@ 125 8@ TW % 8@ 80 6@ 125 8@ TW % 8@ 80 6@ 125 8@ TW % 8@ 80 6@ 125 8@ n = 12N / f c A N f c A 2 Tab2 Mechanical properties of concrete MPa f cu m f cu k f ck f c TW1~ TW TW5~ TW f cu m f cu k f ck f c Tab3 3 Mechanical properties of reinforcement bars TW1~ TW4 TW5~ TW12 f y /MPa f u /MPa Fig1 1 a b c mm Geometry and reinforcement details of specimens mm

66 50 12 2 12 3 MTS 4 5 6 7 8 9 10 11 12

3 MTS T TW5 ~ TW12 2 Fig2 Test setup 15 20~40 kn - Δ y TW1~ TW4 Δ y T 50% Fig3 3 Failure patterns of specimens

4 6 T RC P- θ S 4 5 TW5 ~ TW T TW1~ TW P- θ Fig4 P-θ hysteretic loops of specimens 5 P- θ Fig5 P-θ skeleton curves of specimens

5 mm 4 2 mm ~ t 1 ~ t 6 3 θ 1 ~ θ 6 t 1 ~ t 6 5 θ 1 /t 1 ~ θ 6 /t ~ ~ ~013 T RC θ 1 ~ θ 6 t 1 ~ t 6 13 T RC 6 G 1 G 2 6 G 3 G 4 G 5 4 G 6 Tab 4 Damage extent of each performance state of reinforced concrete shear wall 1 Park 18 θ 1 20% θ 5 θ 6 50% θ 2 θ 3 θ 4 θ 1 θ ~ 3 19 Tab5 Comparison of deformation limits between performance points and phenomenon points 6 θ 2 = θ θ 5 - θ 1 1 θ 3 = θ θ 5 - θ 1 2 θ 4 = θ θ 5 - θ ~ ~ 5 6 ~ 7 8 ~ 9 10 θ 1 /t 1 θ 2 /t 2 θ 3 /t 3 θ 4 /t 4 θ 5 /t 5 θ 6 /t Fig G 1 G 5 G 6 6 Definition of deformation index limits based on skeleton T RC curve 24

6 6 T RC 69 T RC n ρ % θ 1 θ 5 θ 6 T RC ~133 λ θ 2 θ 3 θ 4 θ 1 θ 5 Tab6 6 Deformation index limits for different performance states of specimens TW1 TW2 TW3 TW4 TW5 TW6 TW7 TW8 TW9 TW10 TW11 TW θ 1 = λ n ρ θ 5 = λ n ρ θ 6 = λ n ρ θ 1 = λ n ρ θ 5 = λ n ρ θ 6 = λ n ρ T RC T RC 2 T RC

7 70 50 shear wall with concealed bracings J 4 T RC 11 1 RC J J GONG Zhiguo LU Xilin JI Shouzhong Experimental study on seismic behavior of RC shear walls with different boundary restraints SHI Qingxuan WANG Bin WANG Peng et al Comparison and J Structural Engineers analysis for seismic performance of RC shear wall with flanges under 12 biaxial loading J Journal of Fuzhou University Natural Science J Edition THOMSEN J H WALLACE J W Displacement-based design of ZHANG Hongmei LU Xilin YANG Xueping et al Influence of slender reinforced concrete structural walls-experimental verification boundary stirrup on seismic behavior of reinforced concrete shear J Journal of Structural Engineering SITTIPUNT C WOOD S L Influence of web reinforcement on the cyclic response of structural walls J ACI Structural Journal PALERMO D VECCHIO F J Behaviour of three dimensional reinforced concrete shear wall J Journal of the American Concrete Institute J LI Qingning LI Xiaolei YAN Yanwei et al Experimental research on seismic performance of reinforced concrete short-leg shear wall J Journal of Building Structures T J LI Qingning LI Xiaolei LEI Weining Study on destruction law and stiffness ductility of T-shaped and L-shaped short shear wall J Building Structure J FU Jianping WU Yanjiang PI Tianxiang et al Experimental research on seismic shear capacity of I-shape ductile reinforced concrete structural walls J Journal of Chongqing University Natural Science Edition J FU Jianping WANG Jinlin BAI Shaoliang The seismic shear capacity of I-shaped and T-shaped reinforced concrete structural walls J Journal of Chongqing Jianzhu University J CAO Wanlin CHANG Weihua SONG Wenyong et al Experimental research on seismic behavior of T-Shaped short pier World Earthquake Engineering J ZHU Zhangfeng GUO Zhengxing Test research on seismic performance of plane model of new precast concrete short-limbed shear wall J Journal of Harbin Institute of Technology walls J Structural Engineers GB S 2010 Code for seismic design of buildings GB S Beijing China Architecture & Building Press GB S 2010 Code for design of concrete structures GB S Beijing China Architecture & Building Press JGJ /T S 2015 Specification for seismic test of buildings JGJ /T S L Beijing China Architecture & Building Press RC D 2012 QI Yongle Research on deformation limits of RC beams columns and shear walls based on material strain D Guangzhou South China University of Technology T D 2015 WANG Aoya Research on deformation limits of T-shaped RC shear wall based on material strain D Guangzhou South China University of Technology PARK R Evaluation of ductility of structures and structural T assemblages from laboratory testing J Bulletin of the New Zealand National Society for Earthquake Engineering RC D 2016 SUN Dianlong Experimental research on the seismic performance and T performance index limits of RC shear wall with rectangular section D Guangzhou South China University of Technology 2016

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