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City Council Meeting 7-25-89 Santa Monica, California
ORDINANCE NUMBER 1489(CCS)
(City council Series)
AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF
SANTA MONICA MONICA ADDING SECTION 8111 TO THE SANTA
MONICA MUNICIPAL CODE TO ADOPT A SEISMIC EVALUATION
REPORT FOR PRE-1933 UNREINFORCED MASONRY STRUCTURES
WHEREAS, the recently enacted Unreinforced Masonry Law
requires the City Council of the City of Santa Monica to adopt a
mitigation program for seismically hazardous buildings by January
1, 1990; and
\VHEREAS, the adoption of a seismic retrofitting program for
unreinforced masonry buildings will be considered by the City
Council later this year; and
WHEREAS, the City Council desires the review of such a
seismic retrofitting program by the City Building and Safety
commission; and
WHEREAS, additional information on the condition of
potentially hazardous pre-1933 unreinforced masonry structures
within the City would be useful in evaluating a seismic
retrofitting program; and
WHEREAS 1 the completion of the "Seismic Evaluation Report
for Pre-1933 Unreinforced Masonry Structures" (attached hereto as
Attachment A) by a California state licensed structural engineer
for all pre-1933 unreinforced masonry structures which have been
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identified as substandard and potentially hazardous will provide
the city with information that will be useful in the evaluation
of a seismic retrofitting program,
NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF SANTA
MONICA DOES ORDAIN AS FOLLOWS:
SECTION 1. section 8111 is added to the Santa Monica
Municipal Code to read as follows:
SECTION 8111. Seismic Evaluation
Report. On or before January 25, 1990,
each owner of a pre-1933 unreinforced
masonry structure which has had recorded
against the structure a "Notice of
Substandard Building" shall file with
the Building and Safety Division a
"Seismic Evaluation Report for Pre-1933
URM Structurell on a form provided by the
Building and Safety Division. Such
Seismic Evaluation Report shall be
completed by a California licensed
Structural Engineer whose license is
active.
SECTION 2. Any provisions of the Santa Monica Municipal
Code or appendices thereto inconsistent herewith, to the extent
of such inconsistencies and no further, are hereby repealed or
modified to the extent necessary to effect the provisions of this
Ordinance.
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SECTION 3.
If any section, subsection, sentence, clause,
or phrase of this Ordinance is for any reason held to be invalid
or unconstitutional by a decision of any court of competent
jurisdiction, such decision shall not affect the validity of the
remainlng portions of this Ordinance. The city council hereby
declares that it would have passed this Ordinance and each and
every section, subsection, sentence, clause or phrase not
declared invalid or unconstitutional without regard to whether
any portion of this Ordinance would be subsequently declared
invalid or unconstitutional.
SECTION 4. The Mayor shall sign and the City Clerk shall
attest to the passage of this Ordinance. The City Clerk shall
cause the same to be published once in the official newspaper
within fifteen (15) days after its adoption.
This Ordinance
shall become effective thirty (30) days from its adoption.
APPROVED AS TO FORM:
~...... W'if-=
ROBERT M. MYERS
City Attorney
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Address:
OWNER:
Tel:
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ATTACHHENT A
CITY OF SANTA MONICA
SEISMIC EVALUATION REPORT FOR PRE-1933 URN STRUCTURE
Date
STRUC./ENG:
Tel:
Provide plans/sketches/photos/etc. of building
detailing floor areas, heights, uses and major
structural components and systems. Show all seismic
resistance elements in both horizontal directions/axes
on plans. specify materials of construction of walls,
roof, floors, shear walls and any other features that
may/will influence seismic performance of building.
Qualify condition of all material, i. e., good-poor,
and provide details and dimensions as necessary to
support all calculations.
(Attach sheets and label I)
II) Provide standard Uniform Building Code analysis of
estimated resistance of structure to lateral
forces/accelerations in both horizontal directions.
Analysis shall include evaluation of
torsional/rotational effects on structure, and
estimate of capability of all existing continuity
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components (diaphragms,
necessary to develop
calculations shall be
provided in I above.
anchors, connections,
assumed stress levels.
etc. )
All
referenced to plans/sketches
(Attach sheets and label II)
III) Provide an evaluation of any/all secondary seismic
hazards in structure (parapets, ornamentation, signs,
veneer, open fronts, etc.). Show location and extent
of these features on plans/sketches and submit
analysis/calculations per standard Uniform Building
Code techniques for secondary "cantilevered" elements.
(Attach sheets and label III)
IV) STATEMENT OF MINIMUM estimated level of seismic
resistance of existing URK to failure/collapse.
I certify that I have personally inspected the subject
URM building and performed a comprehensive seismic
evaluation pursuant to the standards of Chapter 23 of
the Uniform Building Code. In my professional opinion
the MINIMUM lateral load resisting capacity of the
existing structure as a percentage (%) of gravity
acceleration is estimated to be %.
STATE LICENSE NO.
Signature Date
*SEE ATTACHED MINIMUM CITY ENGINEERING STANDARDS FOR URM REPORTS.
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CITY OF SANTA MONICA - BUILDING , SAFETY DIVISION
MINIMUM STRUCTURAL EVALUATION STANDARDS FOR SEISMIC (URN) REPORTS
GENERAL CRITERIA
Santa Monica has adopted the 1985 Uniform Building
Code . City is in SEISMIC ZONE 4. All URM buildings have
importance factor of 1. Thus, without extensive site or building
period analysis the standard UBC seismic equation works out as
(0.186 G). Seismic factor for secondary (appended) elements to
structure per UBC is .8/.3 = 2.7. All URM reports and analyses
shall conform to UBC 2303 (b) standard of RATIONALITY, Le.,
"based on a rational analysis in accordance with the well
established principles of mechanics. II All reports must be done
and signed by a CALIFORNIA licensed structural engineer whose
license is active. The REQUIRED REPORT is only an evaluation of
the existing structure and NOT any opinion as to its safety. The
report MAY include recommendations for changes/work to improve
the level of seismic performance of the structure to any ( % G)
above STATE 1933 "RILEY ACT" minimum standards ( 2 % of TOTAL
vertical design load (i.e. Dead + Live).
A) MASONRY TESTS
Any assumed shear stress value for URM walls must be
substantiated by actual field "push" or core tests. Maximum of
10 psi is allowed in calculations for URM. Test locations shall
be shown on plans. Minimum number of tests per building is 8; or
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2 per wall used. Buildings less than 8000 SF may have 1
testjlOOOSF with minimum of 2.
B) ANCHORS TESTS
Existing URM anchors shall be evaluated by actual
shear and tension tests per above standard; or alternatively
evaluated by conventional "free body" engineering analysis and
calculations.
(All tests of URM components shall be done by APPROVED qualified
labs under the supervision of California licensed structural
engineer)
C) SHEAR WALLS-(INTERIOR)
Existing permanent wood and plaster cross walls in URM
buildings may be used as shear walls. Analysis for seismic
resistance shall be in accordance with standard UBC values and
parameters. Walls where height exceeds length should not be
considered shear walls. Maximum value is 200 lbsjft for any
existing wall without destructive testing. Connections of all
interior shear walls to roof and floor diaphragms and foundations
shall be detailed on plansjsketches and evaluated for total shear
forces developed, i.e. overturning. All openings in shear walls
(doors, windows, other) must also be evaluated for stress
concentrations. All critical drag components and their
connections shall also be evaluated.
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Adopted and approved this 25th day of July, 1989.
109c M~~
I hereby certify that the foregoing Ordinance No. 1489(CCS)
was duly and regularly introduced at a meeting of the City
Council on the 11th day of July 1989; that the said Ordinance was
thereafter duly adopted at a meeting of the City Council on the
25th day of July 1989 by the following Council vote:
Ayes: Councilmembers: Abdo, Genser, Jennings, Katz,
Reed, Mayor Zane
Noes: Councilmembers: None
Abstain: Councilmembers: None
Absent: Councilmembers: Finkel
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ATTEST:
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