User s Guide NBC 2005, Structural Commentaries (Part 4 of Division B)

Transcription

1 Ue Guide NBC 2005, Stutual Commentaie (Pat 4 of Diviion B) Eata Iued by the Canadian Commiion on Building and Fie Code The table that follow lit eata that apply to the Ue Guide NBC 2005, Stutual Commentaie (Pat 4 of Diviion B). The eata ae oetion that have been identified; they ae povided to failitate the ue of the Stutual Commentaie. Cetain page fom the Ue Guide have been updated fo you onveniene; they ae povided following the table. Contat you loal authoity having juidition to find out if thee eata apply in you povine o teitoy. Poviion Commentay G Figue G-8 Commentay I Figue I-2, I-3 and I-4 Eatum The eond Figue Note wa oeted to ead a follow: (2) If b i le than 3S /γ, in m, then the effet of the obtution on the now loading an be ignoed. The following text wa added at the end of the Figue title: (Repodued with the pemiion of the National Capital Commiion NCC/CCN) Date of Iue Figue I-5 The following text wa added at the end of the Figue title: (Repodued with the pemiion of The Heliopte Company In., Toonto, Canada, 2003) Paagaph 22 The equation in the eond entene of the example at the end of the paagaph wa oeted to ead: δ = 5 x 10-5 m 3 /N Figue I-7 Thi Figue wa eplaed with the one on the following page: -1-

2 Figue I-7 Extenal peak ompoite peue-gut oeffiient, CpCg, fo pimay tutual ation aiing fom wind load ating imultaneouly on all ufae -2-

3 Poviion Commentay I (ontinued) Eatum Date of Iue Figue I-11 Thi Figue wa eplaed with the following one: α 7 < α 45 H efeene height, h α 7 < α 27 h oof with ovehang oof without ovehang gable and hip oof 7 < α gable oof 27 < α CpCg C o o o CpCg o o o Aea, m 2 Aea, m 2 EG00924C -3-

4 Poviion Commentay J Eatum Date of Iue Figue J-7 Thi Figue wa eplaed with the following one: Paagaph 205 The following text wa deleted fom the lat entene: the ue of apaity deign piniple fo dutile tutue i peified in the CSA mateial tandad fo onete (CSA A23.3 [49] ), teel (CAN/CSA-S16 [61] ), maony (CSA S304.1 [78] ), and wood (CAN/CSA-O86 [47] ); Refeene Commentay K The tandad deignation in efeene numbe [42] wa oeted to ead CAN/CSA-S6-00 Paagaph 10 The efeene to Figue K-3 wa oeted to ead Figue K-1 Commentay L Paagaph 27 The wod load in the title and in the fit entene wa hanged to effet -4-

5 Commentay I Load ae A: wind geneally pependiula to idge H (8) 3E 4 2 4E 2E H oof lope 1 B 1E Refeene height (h) (5) y (6) wind dietion ange Roof lope 0 to to Building ufae 1 1E 2 2E 3 3E 4 4E Load ae B: wind geneally paallel to idge 3E E 4E 2E oof lope 1 5 1E 5E y (6) Z (7) wind dietion ange Roof lope 0 to 90 Building ufae 1 1E 2 2E 3 3E 4 4E 5 5E 6 6E EG00920B Figue I-7 Extenal peak ompoite peue-gut oeffiient, C p C g, fo pimay tutual ation aiing fom wind load ating imultaneouly on all ufae Ue Guide NBC 2005 Stutual Commentaie (Pat 4 of Diviion B) (Updated page ) I-13

6

7 Commentay I α 7 < α 45 H efeene height, h α 7 < α 27 h oof with ovehang oof without ovehang gable and hip oof 7 < α gable oof 27 < α CpCg C o o o CpCg o o o Aea, m 2 Aea, m 2 EG00924C Figue I-11 Extenal peak ompoite peue-gut oeffiient, C p C g, on ingle-pan gabled and hipped oof with a lope of 7 o geate fo the deign of tutual omponent and ladding Note to Figue I-11: (1) Coeffiient fo ovehung oof have the pefix o and efe to the ame oof aea a efeed to by the oeponding ymbol without a pefix. They inlude ontibution fom both uppe and lowe ufae. [24][44] (2) The abia aea in the gaph i the deign tibutay aea within the peified one. (3) End-one width i the lee of 10% of the leat hoiontal dimenion and 40% of height, H, but not le than 4% of the leat hoiontal dimenion o 1 m. (4) Combination of exteio and inteio peue mut be evaluated to obtain the mot evee loading. (5) Poitive oeffiient denote foe towad the ufae, wheea negative oeffiient denote foe away fom the ufae. Eah tutual element mut be deigned to withtand the foe of both ign. (6) Fo hipped oof with 7 < α 27, edge/idge tip and peue-gut oeffiient fo idge of gabled oof apply along eah hip. [45] Ue Guide NBC 2005 Stutual Commentaie (Pat 4 of Diviion B) (Updated page ) I-17

8

9 Commentay J a t 4H Soil ρ, β T 1 = H V, V a 0 ρ, V Rok EG00991B Figue J-7 Elati laye on elati half-pae Nonlinea Site Amplifiation 67. Unde tong haking, the epone of the oil will be nonlinea. The hea modulu and damping ae tain dependent and theefoe the lage tain, aoiated with tong haking, edue the effetive hea moduli and ineae the damping. The hea tength of the oil alo put a limitation on the magnitude of the ufae aeleation beaue the eimi wave annot geneate hea tee geate than the mobilied heaing eitane of the oil. Field evidene how that the nonlinea behaviou of oil aue the gound motion amplifiation fato to be dependent on the intenity of haking. 68. In Figue J-8, Idi [31] ha onveniently ummaied the nonlinea elationhip between peak aeleation on oft oil ite and thoe on aoiated bedok ite. The median uve i baed on data eoded in Mexio City duing the 1985 Mihoaan eathquake and on tong motion data fom the 1989 Loma Pieta eathquake. The pat of the median uve fo peak ok aeleation geate than 0.2g i baed on 1-D ite epone analye uing the SHAKE ompute pogam (Shnabel et al. [32] ). The uve ugget that, on aveage, the bedok aeleation ae amplified in oft oil until the peak ok aeleation eah about 0.4g. The highe amplifiation atio between ok and oil ite, in the ange of 1.5 4, ae aoiated with ok aeleation level of le than 0.10g, when the epone i loe to being elati. The ineaed nonlineaity of oft oil epone at the highe aeleation edue the amplifiation atio beaue of the ineae in hyteeti damping and the edution in effetive hea moduli. J-18 (Updated page ) Ue Guide NBC 2005 Stutual Commentaie (Pat 4 of Diviion B)