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Email this pageDIVISION B - PART 4

APPENDIX A


to the First Round of Consultation on Potential Changes for the Next Edition of the Building Code

October - November 2010



PROPOSED AMENDMENTS TO DIVISION B, PART 4


CHANGE NUMBER

CODE REFERENCE

SUBJECT

TYPE

B-04-01-01

Div. B Table 4.1.2.1.

Add crane load combinations from the mandatory Appendix C of the CAN/CSA-S16 standard, which requires more detailed categories of loads to address crane loading

mNBC

B-04-01-02

Div. B 4.1.3.1.(1)(b)

Add newly defined symbol”C” that is proposed for Table 4.1.2.1.A.

mNBC

B-04-01-03

Div. B 4.1.3.2.

Add crane load combinations from the mandatory Appendix C of the CAN/CSA-S16 standard.

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B-04-01-04

Div. B 4.1.3.2.(2)

Add requirements for crane loads combinations in conjunction with snow load.

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B-04-01-05

Div. B 4.1.3.2.(2) & (3)

Add requirement that one of the load combinations that must be considered is the principal load acting alone.

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B-04-01-06

Div. B 4.1.3.2.(4)

Add crane load combinations from the mandatory Appendix C to the CAN/CSA-S16 standard.

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B-04-01-07

Div. B 4.1.3.2.(5)

Add crane load combinations from the mandatory Appendix C of the CAN/CSA-S16 standard.

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B-04-01-08

Div. B 4.1.3.2.(6)

Add crane load combinations from the mandatory Appendix C of the CAN/CSA-S16 standard.

mNBC

B-04-01-09

Div. B 4.1.3.2.(7)

Add crane load combinations from the mandatory Appendix C of the CAN/CSA-S16 standard.

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B-04-01-10

Div. B 4.1.3.2.(8)

Add crane load combinations from the mandatory Appendix C of the CAN/CSA-S16 standard.

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B-04-01-11

Div. B Table 4.1.3.2.

Revise footnotes to Table 4.1.3.2. to correspond with other code changes.

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B-04-01-12

Div. B Table 4.1.3.2.A
Table 4.1.3.2.B

Add tables to adequately deal with crane loads.

mNBC

B-04-01-13

Div. B Table 4.1.5.3.

Revise Table to provide an enhanced description of the use of certain areas in order to determine the applicable minimum specified live load.

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B-04-01-14

Div. B Table 4.1.5.3.

A-Table 4.1.5.3.

Clarify description of the live loading requirements for several types of assembly areas.

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B-04-01-15

Div. B Table 4.1.5.3.

A-Table 4.1.5.3.

Clarify which minimum specified load applies to the design of an area of floor or roof.

mNBC

B-04-01-16

Div. B Table 4.1.5.3.

Revise footnote reference as Sentence 4.1.5.1.(1) provides the same information as Article 4.1.5.7.

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B-04-01-17

Div. B 4.1.5.7.

Delete the Article as it is superfluous and can be misleading.

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B-04-01-18

Div. B 4.1.5.10.(1)

Revise contact areas for specified concentrated live loads on roofs and floor areas to be more representative of the actual load contact area.

mNBC

B-04-01-19

Div. B 4.1.5.12.(2)

Add a new sentence as a “signpost” to reference new provisions applicable to crane loads.

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B-04-01-20

Div. B 4.1.5.14.(1)

Revise Sentence to highlight specific applicable provisions.

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B-04-01-21

Div. B 4.1.5.15.(1)

Add guards protecting open viewing stands without fixed seats in the provisions specifying horizontal loads at the minimum required height of guards.

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B-04-01-22

Div. B 4.1.5.16.(1)

Revise the application of vehicle guardrails to all vehicle guardrails. (This is currently limited to storage garages.)

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B-04-01-23

Div. B 4.1.7.1.(5)

Revise the Sentence to reflect research findings regarding use of the rough terrain factor.

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B-04-01-24

Div. B 4.1.7.2.

Base the definition of a flexible building on the lowest natural frequency of the structure, and reduce the height limit to be compatible with the 1 Hz limit.

mNBC

B-04-01-25

Div. B 4.1.8.2.(1)

Revise the definition of Rd to clarify it relates to cyclic inelastic behavior.

mNBC

B-04-01-26

Div. B 4.1.8.2.(1)

Specify an upper limit on the design base shear for the dynamic procedure, which involves the introduction of a new parameter, the design elastic base shear, Ved.

mNBC

B-04-01-27

Div. B 4.1.8.4.(5)

Add exemption for geotechnical investigations and dynamic site response analysis for special cases of short period buildings on liquefiable soils.

mNBC

B-04-01-28

Div. B 4.1.8.4.(6)

Revise requirements for geotechnical investigations and dynamic site response analysis for the special case of short period buildings on liquefiable soils.

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B-04-01-29

Div. B Table 4.1.8.4.A

Add a footnote to Table 4.1.8.4.A. for Site Classes A and B that restrict their application to sites with no more than 3 m of soil between the rock surface and the bottom of the foundation unit.

mNBC

B-04-01-30

Div. B Table 4.1.8.4.A

Revise the Site Classification Table to relax requirements on hard rock.

mNBC

B-04-01-31

Div. B Table 4.1.8.6.

Revise Table to modify the definition of an In-plane Discontinuity in a vertical lateral force-resisting element to exclude framed structures.

mNBC

B-04-01-32

Div. B 4.1.8.9.(4)

Revise Sentence to accommodate construction of specialized rooftop structures exceeding two storeys in height.

mNBC

B-04-01-33

Div. B Table 4.1.8.9.

Include Rd (ductility-related force modification factor) and Ro (overstrength- related force modification factor) and the corresponding system restrictions for Cold-Formed Steel Structures.

mNBC

B-04-01-34

Div. B Table 4.1.8.9.

Revise Table to include separate data for assembly occupancies and other occupancies

mNBC

B-04-01-35

Div. B Table 4.1.8.9.

Add the new steel Buckling-restrained braced frame types of SFRS in Table 4.1.8.9. to be consistent with CAN/CSA-S16.

mNBC

B-04-01-36

Div. B Table 4.1.8.9.

Revise the types of SFRSs in Table 4.1.8.9. to be consistent with CAN/CSA-S16.

mNBC

B-04-01-37

Div. B 4.1.8.10.(2)(d)

Revise the Sentence to not allow lesser storey stiffness in lower levels for post-disaster buildings

mNBC

B-04-01-38

Div. B 4.1.8.11.(2)

Change the lower limit on the design force to that calculated for a fundamental period of 4 s for wall, coupled wall and wall-frame systems.

mNBC

B-04-01-39

Div. B 4.1.8.11.(2)

Revise the provision to limit the upper cap to soils belonging to Classes A, B, C, D, and E.

mNBC

B-04-01-40

Div. B 4.1.8.11.(3)(d)

Revise Sentence to assign a fundamental lateral period Ta for other structures which are currently not addressed

mNBC

B-04-01-41

Div. B

4.1.8.11.(3)(d)(iv)

Clarify which period value to use for calculating deflections, and that the new proposal for the 4 second period for wall structures needs to tied to the period limits for deflection

mNBC

B-04-01-42

Div. B 4.1.8.11.(8)

Revise the Sentence so that both Clauses (a) and (b) apply concurrently.

mNBC

B-04-01-43

Div. B 4.1.8.11.(10)

Extend the application of Clause (a) to cases where B > 1.7 and IEFaSa(0.2) less than 0.35.

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B-04-01-44

Div. B

Table 4.1.8.11.

Provide Mv and J factors that are compatible with the proposed change in force cut-off to 4 sec.

mNBC

B-04-01-45

Div. B 4.1.8.12.(4)

Revise the determination of Fx by either elastic dynamic analysis or as determined from Sentence 4.1.8.11.(6) multiplied by RdRo/IE.

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B-04-01-46

Div. B 4.1.8.12.(5)

For short period structures having Rd equal to or greater than 1.5 and located on sites other than Class F the equivalent static load procedure specifies an upper limit on the design base shear. A change has been proposed to address this for the static procedure, however a similar provision does not exist for cases where a dynamic analysis is used to find the design forces. Modify and renumber to Sentence 7.

mNBC

B-04-01-47

Div. B 4.1.8.12.(5)

For short period structures having Rd equal to or greater than 1.5 and located on sites other than Class F the equivalent static load procedure specifies an upper limit on the design base shear. A PCF has been proposed to address this for the static procedure, however a similar provision does not exist for cases where a dynamic analysis is used to find the design forces. New Sentence (5).

mNBC

B-04-01-48

Div. B 4.1.8.12.(6)

For short period structures having Rd equal to or greater than 1.5 and located on sites other than Class F the equivalent static load procedure specifies an upper limit on the design base shear. A change has been proposed to address this for the static procedure, however a similar provision does not exist for cases where a dynamic analysis is used to find the design forces. New Sentence (6).

mNBC

B-04-01-49

Div. B 4.1.8.12.(8)

Clarify that the values of elastic storey shears, storey forces, member forces, and deflections obtained from the Linear Dynamic Analysis include the effect of accidental torsion in determining the design values.

mNBC

B-04-01-50

Div. B 4.1.8.13.(3)

Revise Sentence to replace "schools" with "High Importance Category" buildings.

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B-04-01-51

Div. B

4.1.8.15.(1) - (3)

Revise the Article to allow steel roof deck and timber diaphragm systems to be designed and detailed to allow inelastic deflections to take place safely in the diaphragms, without detrimental effects on the overall building response.

mNBC

B-04-01-52

Div. B 4.1.8.15.(5)

Permit other materials design standards to examine the possibility of relaxing the force cut-off, while introducing a limit of 1.3 to avoid too low, unrealistic, cut-off values.

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B-04-01-53

Div. B 4.1.8.17.

Add new provision that slope stability shall be taken into account along with an Appendix note.

mNBC

B-04-01-54

Div. B 4.1.8.17.(6)

Revise the Sentence to include other equipment that will have a similar effect as tanks on the building.

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B-04-01-55

Div. B 4.1.8.17.(8)(e)

Clarify that, for a connection to be ductile, the forces used for the connection are to be based on capacity design principles, which results in a connection design force that is 2.0 times that of the nominal yield resistance of the body of the connection.

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B-04-01-56

Div. B 4.1.8.17.(8)(f)

Revise definition of "ductile connection" to make it more consistent with the basis for ductility as conveyed in the remainder of Subsection 4.1.8.

mNBC

B-04-01-57

Div. B 4.1.5.1.(1)

Clarify that, in certain cases, loads from the intended use may exceed the minimum loads specified in tables 4.1.5.3. and 4.1.5.10 and that this is to be considered in determining the specified live load for the design of the particular area. Add a corresponding Appendix Note.

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B-04-04-01

Div. B 4.4.4.1.(1)

Revise the Sentence to limit the application to suspended window cleaning operations and reference the CAN/CSA Z91-02 standard.

Provincial