Repair of existing

[5747hazel]

I copied section 405.2.3.1 for evaluation from IEBC as below

"405.2.3.1 Evaluation. The building shall be evaluated by a registered design professional, and the evaluation
findings shall be submitted to the code official. The evaluation shall establish whether the damaged building, if
repaired to its pre-damage state, would comply with the provisions of the International Building Code for for load
combinations that include wind or earthquake effects, except that the seismic forces shall be the reduced seismic
forces."

my question is what edition of strength codes to use. say it is a steel building, which edition of AISC to use. same question applies to ACI. also for repair

"405.2.3.3 Extent of repair for noncompliant buildings. If the evaluation does not establish that the building
in its predamage condition complies with the provisions of Section 405.2.3.1, then the building shall be retrofitted
to comply with the provisions of this section . The wind loads for the repair and retrofit shall be those required by
the building code in effect at the time of original construction, unless the damage was caused by wind, in which
case the wind loads shall be in accordance with the International Building Code. [partial shown]"

which edition of steel and concrete codes to use for code checking? further more wind loads from ASCE 7-05 or earlier edition might not compatible with current ACI or AISC and other codes for material strength.

I am assuming they all should be current edition. any comments? thanks

 

[le99]

The cited code article tells you clearly that the evaluation and design shall comply with the "Internal Building Code (IBC)", if no specific edition was mentioned, then you shall use the "Latest Edition". On the same token, the IBC refers to the edition of the AISC and ACI standards it used in its coverage of the structural steel and reinforced concrete structures respectively.

 

[5747hazel]

le99

The cited code article CLEARLY does not tell which editions to use which makes it not quite CLEAR. Also if the original wind load is from ASCE 7-05 or earlier edition there might be problems using current AISC or ACI to do code check.

Thanks for not helping.

 

[dauwerda]

I would say whatever edition of the IEBC you/the AHJ are using, you would use the corresponding IBC edition.

 

[le99]

The evaluation shall establish whether the damaged building, if
repaired to its pre-damage state, would comply with the provisions of the International Building Code for for load combinations that include wind or earthquake effects,...

...in which case the wind loads shall be in accordance with the International Building Code.

You are been told to use the IBC latest edition (since not mentioned in the code body). Yes, it can be a pain on the butt, if the design was based on the older edition of the reference standards (AISC, ACI), then you have to bring the design up to whatever edition referred in the latest IBC.

 

[5747hazel]

it is always safe to use the current code which is the easiest. but no. it does NOT tell the edition of IBC.

the reason I am asking is that when you do repair under certain circumstances it allows you to use the wind load of the original design say wind load from 1973. the wind load after ASCE 7-05 is totally different.... it is not compatible to current AISC or ACI which makes it not possible to use current code to code check. or even it is allowed you can not really use the original wind load.

le99

No. there is no pain to use the current code. engineers like it. but owners would like to less stringent to allow less upgrade which is why we have IEBC instead of IBC to deal existing. otherwise we just simply demolish everything and build a new one.

 

[kipfoot]

The code provision you cite is related to the paragraph on "Substantial structural damage to vertical elements of the lateral force-resisting system." For the purpose of the exercise to evaluate the extent of damage, you would use the International Building Code from the same year as the Existing Building Code that you cite. They are published together.

When designing based on ACI or AISC, the code directs you to the version that is referenced in the IBC Chapter 35, "Referenced Standards"

For example, IBC 18 points you toward ACI 318-14 and IBC 09 references ACI 318-08.

(I also try to sprinkle a good bit of what I think is engineering judgement on provisions like this.)