6 Vol No6 6 6 Jue 6 ENGINEERING MECHANICS -7565-- * 56 56 6 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 [~] -7---8 *959E-ail: cvjcai@scuteduc 97
[] 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 8 6 5 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
y y y 5 78 t y f 6 8 t y f 7 67 67 898 y 98 C C5 C5 C8 8 7 7 f t y 8 7 8 7 f t y 9 7 7 5 f t y 7 9 7 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
V u 8 π D 5 Vu 8B 5 π y 5 5 y [8] [8] 7 7 8% [7] 5 8 6 [9] 5 fcu MPa~9MPa %~ 7% 7~7 5~96 µ 955 δ 7 V cal /kn 5 5 5 5 5 5 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
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