ULTIMATE PUNCHING SHEAR STRENGTH FOR CONCRETE SLABS BASED ON TWIN-SHEAR STRENGTH THEORY

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1 6 Vol No6 6 6 Jue 6 ENGINEERING MECHANICS * TU75A ULTIMATE PUNCHING SHEAR STRENGTH OR CONCRETE SLABS BASED ON TWIN-SHEAR STRENGTH THEORY CAI Jia, LIN a Dept of Civil Egieerig, Sout Cia Uiv of Tec, Guagzou 56, Cia; Arcitecture Desig ad Researc Istitute Sout Cia Uiv of Tec, Guagzou 56, Cia Abstract: Te pucig failure of cocrete slabs is siplified as a proble of plae strai Te cobied stresses o te sear-copressio zoe of cocrete slabs at te oet of pucig failure are aalyzed by te twi-sear stress tree-paraeter stregt criterio, ad te ultiate vertical sear stress o te sear-copressio plae is obtaied By eas of equilibriu coditios, a forula of ultiate pucig sear stregt of cocrete slabs is derived Te calculated results are i good agreeet wit te eperietal results of 6 species i doestic ad foreig literature Te aalytic etod is clear i pysical coceptio, ad te teoretical epressios ca be used as referece i structural desig Key words: cocrete slab; ultiate pucig sear stregt; twi-sear stress tree-paraeter stregt criterio; cobied stress; pucig failure [~] *959E-ail: cvjcai@scuteduc 97

2 [] β C β C β β C f t f c f bc f c / ft α f bc / f c α 5~5 [] [] α β β C β β C f t 5 6 ~6 5 5 f 7 t ft 8 5% [5] y y [6,7] 5 o ~5 o α 5 y s 7 a -7 a P ig Oblique sectio of cocrete slab M 9 a cot y 5 y a 7 a y 7

3 y y y 5 78 t y f 6 8 t y f y 98 C C5 C5 C f t y f t y f t y f t y [9] ρ ρ k k ρ ρ 5 5 D D k ρ D π D B B ρ c s E E s E c E c f cu E / 5 / ~ Y y 5

4 V u 8 π D 5 Vu 8B 5 π y 5 5 y [8] [8] 7 7 8% [7] [9] 5 fcu MPa~9MPa %~ 7% 7~7 5~96 µ 955 δ 7 V cal /kn V test /kn ig Copariso of calculated values wit eperietal values y % % 6 [] Jiag Da-Hua, Seg Jig-Hua Stregt of cocrete slabs i pucig sear [J] Joural of Structural Egieerig, ASCE, 986, : 578~59 [] Bortolotti L Pucig sear stregt i cocrete slabs [J] ACI Structural Joural, 99, 87: 8~9 [] Sali W, Sebastia W M Plasticity odel for predictig pucig sear stregts of reiforced cocrete slabs [J] ACI Structural Joural,, 996: 87~85 [] [J], 996, : ~7 Ya Zogda Solutio of te aisyetrical pucig proble of cocrete slabs by te twi sear stregt teory [J] Egieerig Mecaics, 996, : ~7 i Ciese [5], [J],, 65: 7~9 Wag Abao, Yag Xiui Aisyetrical pucig stregt of cocrete slabs [J] Buildig Sciece,, 65: 7~9 i Ciese [6], [J],, 66: 8~ Wag Abao, Yag Xiui Aisyetrical pucig stregt of cocrete slabs [J] Egieerig Mecaics,, 66: 8- i Ciese [7], [J],, 95: 9~96 Wei ueyig, Yag Zeg Solutio of aisyetrical pucig stregt of cocrete slabs wit uified stregt teory [J] Egieerig Mecaics,, 95: 9~96 i Ciese [8], [J],, : 58~6 Li Xujia, Zeg Zuoqiao New collapse ecais ad ultiate pucig sear stregt of reiforced cocrete slabs [J] Egieerig Mecaics,, : 58~6 i Ciese [9] Bros C E Pucig of flat plates-a questio of cocrete properties i biaial copressio ad size effect [J] ACI Structural Joural, 99, 87: 9~ []~[9] 9

5 9 [] Buyukozturk O Noliear aalysis of reiforced cocrete structures [J] Coputers ad Structures 977, 7: 9~56 [] [M] 99 Jiag Jiajig Noliear fiite eleet aalysis of RC structures [M] Xia a: Sai Sciece ad Tecology Press, 99 i Ciese [5] CEB-IP Coittee Model code 9 [S] Lausae, 99 [6] Walrave JB, Reiardt HW Teory ad eperiets o te ecaical beavior of cracks i plai ad reiforced cocrete subject to sear load [J] HERON, 98, 6a: ~ [7] Kwak HG, ilippou C iite eleet aalysis of reiforced cocrete structures uder ootoic load [R] Researc report of Departet of Civil Egieerig, UC Berkeley, 99, No UCB/SEMM-9/, ~9 [8] Ca TK, Niall M Stregteig of oe-way slabs usig carbo fibre plates: te effect of preload [R] CSE Researc Bulleti No, Nayag Tecology Uiversity, Sigapore, [9] Raii H, Hutciso A Cocrete beas stregteed wit eterally boded RP plates [J] J Copos Cost ASCE,, 5: ~56 [] [J], 5: ~5 Ye Liepig, Cui Wei, Yue Qigrui, Hu Kogguo Aalysis ad calculatio of fleural stregt of RC ebers stregteed wit CRP seet [J] Buildig Structure,, 5: ~5 i Ciese [] Grace N, Abdel-Sayed G, Rageb W Stregteig of cocrete beas usig iovative ductile fiber- reiforced polyer fabric [J] ACI Struct J, 995: 69~7 [],, [J],, : 5~58 Zao Mig, Zao Haidog, Zag Yu Eperietal study o fleural RC ebers stregteed wit CRP fabrics [J] Structural Egieers,, : 5~58 i Ciese [] Brea S, Brablett RM, Wood SL, Kreger ME Icreasig fleural capacity of reiforced cocrete beas usig carbo fiber-reiforced polyer coposite [J] ACI Struct J, : 6~6 [] Si YS, Lee C leural beavior of reiforced cocrete beas stregteed wit carbo fiber-reiforced polyer laiates at differet levels of sustaiig load [J] ACI Struct J, : ~9 [] Ibraia A E, Seata M Siplified odel for estiatig te pucig resistace of reiforced cocrete slabs [J] Material ad Structures, 99, : 6~7 [] Ibraia A E, Seata M, Rega P E Pucig i RC slabs [J] Joural of Structural Egieerig, ASCE, 989, 57: 78~7 [] [M] :, Yu Maoog Cocrete Stregt Teory ad Applicatio [M] Beijig: Hig Educatio Press, i Ciese [] [M] :, 99 Guo Zeai Reiforced cocrete teory [M] Beijig: Tigua Uiversity Press, 99 i Ciese [] GB5- [S] :, Code for desig of cocrete structures [S] Beijig: Cia Arcitecture ad Buildig Press, i Ciese [5] Moe J Searig of RC slabs ad footigs uder cocetrated load [R] Portlad Ceet Associatio Researc ad Developet Laboratories, 96 [6] Meetrey P Aalytical coputatio of pucig stregt of reiforced cocrete [J] ACI Structural Joural, 996, 9: 5~5 [7] Teodorakopoulos D D, Sway R N Ultiate pucig sear stregt aalysis of slab-colu coectios [J] Ceet ad Cocrete Coposites,, : 59~5 [8] Lovrovic J S, McLea D I Pucig sear beavior of slabs wit varyig spa-dept ratios [J] ACI Structural Joural, 99, 875: 57~5 [9] [D] :, Li a Eperietal study o seisic beavior ad ultiate pucig sear stregt of iterior slab-cst colu coectios [D] Guagzou: Sout Cia Uiversity of Tecology, i Ciese

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