HomeMy WebLinkAboutPermit Correspondence 1979-02-20GEORGE L. GRIFFIN
CONSULTING ENGINEER
TELEPHoNE (503 ) 746-2250
2866 MANOR DRIVE
SPRINGFIELO, OREGON 97477
Fei:ruary 2Q, L979
I"1r. Ron CIarkSpringfield Building Department
346 l'lain St.
Springfield, Oregon
Dear Mr. Clark:
Reference: Dome Structure
987 Sunset DriveSpringfield, Oregon
At the request of I1r. Rich Schmitt, I checked the
structural analysis for the l{ood Dome house which is
to be constructed at the above location. The calculations
for the structural analysis conforms to good engineering
practice, and the structure will support the design
loads.
If you have any questions please call me.
L1
Cc: Mr. Rich Schmitt
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STRUC lUriAL AN, 5 lS - UUud r)')l'1E PAGE - I 2.
I{UHBER: E ::.IDATEC: 4/75
The general loading condii.ions appi ied to the structure are a sric.d
loading, a rvind loading, and a thirct loading condition vrhich
represents 752 of wind and 752 of the snow loading combined.
The snow loading is developed from the unit loadings specified i::
the State Bui lding Construction Code (General Eui lding ConsEruci ion,
state of New York, sections c304.3 (833.3), p9. 83 and rable cac:"46
pg. 85). The snow loading distribution is a function of slope. The
appropriate loadings are selected depending on the location of t-e
dome. Typical snol distribution for a given structure is found'-o
vary from 40 psf to approximately ! psf. This loading is appl iec
to approximately the upper two thirds of the structure.
The wind loading is developed from either 75 mph or 100 mph velc:ity
producing I 5 and 27 psf respectively. The wind structural loao I s
applied to the lovrer 2/3 of the height and all to one side.
The structural chords are fabricated from 2xl+ inch Douglas Fir c:-
equivalent wood material exhibiting a bending modulus of rupture of
at Ieast 10,900 psi with an ultimate crushing strength parallel ao
the grain of 5500 psi. Sonne imperfections in the material grain
are permitted so long as the imperfections are confined to the
central region of these me;nbers and in no case at the ends where the
connection is made. The end connection to each member is made bv
conical plates (202\"t3 aiuminum al loy t=.12! inch) at each joir"::
which sandvrich the members. The ends of each member are reinforced
by an aluminum bolted sleeve (ZOZ\-13, t=.125 inch) and connecte=
to the conical plates by a single bolt. The entire joint is
designed to develop without failure at least 40 percent of the
maximum breaking strength of the v/ood material in pure bending.
The analysis of this local strength is contained within the stru.tural
ana'lys i s report.
The structure is analyzed for internal forces using the HcDonnel I
ECI ICES STRUDL, and treated as a 'rSpace Framerr, where moment
continuity is observed about the stronger axis of the connectir:-c
members. Because of the single bolt connect,ion the members are
released about the weaker axis in bending. The panel ing is not
considered as providing bending material but is used in the local
stability analysis.
The STRUDL analysis is a I inear, elastic, static, smal I displacelent
analysis. The procedure treats the joint displacements'as unkncxns.
The analysis provides resul ts for joints, members and elements.
Joint resul ts include displacements and end reactions as calculated
from member forces. The member orientation in space is considered
in terms of the inclination of the principal bending axis to the
appl i ed I oad .
The analytic procedure provides the computation of principal stresses
for al I members. The principal stresses are computed for each -ember
resul ting from the three loading conditions. A separate stress
analysis is r,rade for bearl-colur':in stability considering the loncest
mernber with its load and the highest loaded member with its len'gth.
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STRUCTURAL ^;iALYSIS - WCr0 DOHES PAGE - I 2A-
NUHBER: r I 068DATED: \/75
The end rnoments and shears are compared vrith the al lovrabie
values calculatecj for each joint. The structure is analyzedfor a safety factor of 1.5.
Compu te r 0utput Resul ts
l) The loadlng conditions are listed with the locations of all
the appl ied loads.
u) Snow Loads
b) \{ind Loads
c) 752 Snow plus 75? Wind Loads
2) Al I internal member loads: shears, bend ing moments and axial
Ioads are listed for each member for each of the externally
appl ied loading conditions.
3) All ground plane reactions are listed for each of the above
loadings. Footing attachments must be made good for these
loads.
4) R taUle I isting the maximum principal stress and the minimumprincipal stress is given for al I members. This table represents
the highest values obtained from each of the three loading
conditions. ln addition, the stresses shown are the largest
value obtained from calculated stresses at six (5) sections
on each member.
) Hember forces are compared between all three loading conditionsat the member start, at 50!/ length and at the member ends for all
members.
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ORDINANCE No.3968
\./HEREAS, the Springfield City Counci I previously declared its intention to
vacate certain easements in the City of Springfield as described below; and
\,/HEREAS, such vacation is in the best interest of the City in carrying out
its plans and programs for the general development of the City; and
WHEREAS, lawful notice of the proposed vacation was published and posted;
and
WHEREAS, the Springfield City Council met in the Municipal Meeting Room of
the Springf ield Utility Board Bldg., 250 I'lo. r'A" St., Springf ield, 0r., on l'londay
the l6th day of October, 1978, at the hour of /:10 p.m., to hear any objections t,
the proposed vacation and no persons appeared to object;
N0w, THEREF0RE, THE SPRTNGFTELD ClTy C0UNCtL D0ES 0RDAtN:
Sect i on I The Counci I finds that Iegal notice of the hearing was
lawfully published and posted; that no objections were made to the easement
vacation at the hearing held; that the publ ic interest will not be impaired
by the vacation; and that the easement vacation will be to the best interest
of the public and increase the benefit of the property involved.
Sect i on easements in the City
ofS e are declared to be vacated:
Certain Public Utilit Easements in FERNCREST (Entec lnc./Plants)
ubl ic easements along side proper Ii
Ba an , Lots 29 and 30,
on the REPLAT 0F THE REPLAT 0F BLOCK 32, EMERALD HEIGHTS ADDITI0N
T0 SPRINGFIELD, as platted and recorded in Book ll, Page 15, Lane
County 0regon PIat Records, in Lane County, 0regon.
Section 3: lt is a further condition of this vacation that nothing con-
tained in this ordinance shall cause or require the removal or the abandonment of
any sewer, water main, gas main, conduit, or device used or intended for any pub-
lic service, except by mutual agreement between the agency holding such right and
the property olvners in whom the title to the vacated property shall vest.
Sect ion It The City Recorder is directed to fi le certified copies of this
ordinance with the Lane County Clerk, Lane County Assessor, and Lane County Sur-
veyor.
Section 5: lt i
,
o
(
matters pertaining to t
public health, safety a
to Lots
as shown
s hereby found and determined by the Common Council that
he vacation of publ ic easentents are matters affecting the
nd we I fa re, and tha t an emergency therefore ex i s ts , and
AN 0RDtNANCE VACATTNG CERTATN pUBLtC UTtLtrY EASEI'IENTS lN FERNCREST, lN THE CITY
OF SPR I NGF I ELD, LANE COUNTY , OREGON , AND DECLAR I NG AN EMERGENCY.
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- UL'rr,,
Pub.Liu llea rings
Septemben 7, 1977
The motion was approved unanimously.
The Comnrission accepted the ioJ low:',ng f indings of fact:
compliance with the adopteci Comprehensive pl.an ancl thisthis propenty as conrmencially zoned anci conrercial-J-y usecJ
he north and south. This pnop was under an ROI to
This request
is a logical
land adjoins
be zoned C-2
l-s Ln
use for
it on
in ttreL
p
Lots
6200,
8400 ,
6300,
8700,
6tr00
88 00
Located at the top of Ke1ly
This property is made up of
Butte between Summi.L Boulevard and Sitnset Drive.six tax lots containing approximatel-y 5 acres.
Applicant requests ato 10 feet from the
i.-rom the current front y.rrd setbackIine because of the steepness of the
varl_ance
pr"operty
regu Iation
slope.
John Charles tol-d the Planning Commission thatfinrlings of fact as to the conditions outlined
Zoning Code in order to grant a varianr:e.
they must make affirmative
in Sec L-ion 27 . 03 of the
s Larry Beggs, 29BB M.:r,lisotr, wrrs present to repr(,sent t.he rr.r(luest. Ile indicatedthat the Board of Appeals hari granted a variance for one of the lots in May,but had suggested that he conrr: to the Planning Colnrnission to obtain avariance on the other lots. This site is very unique anrl is not condr-c iveto standard homes. Mr. Beggs said he did not bel-ieve that granting the variance
woul-d be detrimental to the public we.l-fare. Off street parking wiit Ue provided.
John Chanles indicated that the applicant must address numben 4 of this sectionwhich states that the grantingrrof the variance wil-l not adversely affect thedevelopment plan or this Ordinance.'r I,In. Charles poi.nterl out thai the applicantmight need the variance to enjoy substanEial property rights.
Mr. Beggs indicated that the granting of this variance wi.l-I not affect theZoning Code, as the property will still- be zoned Ii,-1. It woul-cl , however, bea financial bunden to maintain the standand setbacks. It woul-d nequir"e moreexcavation and the houses woul-d be on higher stilts.
Gene Davis,734 Summit Boulevard, spoke in favor of the request. He said therequest makes sense and is rogical as this pnoperty is very steep.
There was no one present to speak in opposition to the request
Dick Johnson commented that the staff is in favor of the request. The develop-ment would cause the l-east amount of damage both to the property and aesthetically.The propenty is ideal fon the deveropment of custom built htmes-. There need beno additional widening of the streets. There is a 409o slope on some of theseIots.
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Inc. (Journal- No. S-77-68)
Assessorfs Map 17 03
Assessonts Map 77 03
Entec
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Page 281
s
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t.'ublic llearings
September 7, L977
Melvin Suit said that he haci been a m.inber of tlre Buj.lding Roard oF Appeals when
this nequest had been considered. Ile irad recorr;rnended that l,ln. Beg,gs coille to the
PJ"anning Commission. ile inrlu:-red about the parking situation. Mr. Beggs saici
that they are going over a nu,'nbe:: of al-ternatives including shared panking and
deck parking. The Pl-anning Conrmission discussed the various possibilities for
panking.
t'10T I0N :ft was move<l by Rob Adanrs and seconded by Melvin Suit to approve this
subject to the granting of a 5 foot wide utiJ-ity easement on bothreqllest
streets.
Nelson Grubbe noted that this is the same liill that tire Breedon Brothers had
requested a variance for sidewal-ks for. Tire Planning Commission did not aLlow
that request.
The motion was approved unanimously.
John Charles told the Planning Commission ttrat this was a good example ol a
request where a var"iance could appfy. The property is unique and is different
fnom other propenty.
Edward L. !i*s1ry (Journal No. S-77-69)
Asse .orf s Map 17 03 26 23 'lax Lots 1600, 1700
Located a 75
Street Coupi
talJ
and
Street on the :;outh side of
2nd Street. This property
approximateLy 4.6 acnes.
Itre street ween 1'he 2nd-3rd
is macle u 'f two tax lots con-
taining an area
Applicant requests a
and ttett. Item d cal
with a street to run
and item e calls fon
Chairman Wood asked [hat
ROI be entered into the
nge in the Resolution of tent
Is "Submittal of a s v1s.1 0n
ACTOSS
" Full-
is propeyty 1 he south
ement o wo-thirds of
by deleting items "d'rwithin six (6) months
eclge of the property."
t St Street. tl
the le1.'ten 'tted by Mr. Ramsay and the original
record.
Ed Ramsay, 665 City View, wa resent to re sent the request. He said that
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at the 'Eime the R.OI was
housing. However, now
o];nccl the ol-an irad to buil-d some low income
er going over the proPo it woul.<i eost almost
$too,00o to develop t streets and begin construct There is no way to
aning wer-e r:efuctantamortize thi,s cost.esidents who attended the public
to approve the p sal because of the increased traffic would bning onto
I Sr Street
southeast
access to
N Ramsay said he dir] h;rve an option on a 60 strip at the
ero f the 1>r.oper,Ly out to 2nd Street. lle propose
e property through this parcel. There would be a fire e -rn place
of rSt Therne would al-,'so be a planted berm along 'Sr Street.old
ho ld be el-iminated fronr the pr.operty. l'1r. Ramsay said he would sign
an improvement agreernen'r to improve hal-f of rSr Stneet when a majority of
pnoperty owners on rSr Street desire the stneet.
provide
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Page 282
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LEE C. PLANTS
PROFESSIONAL EilGINEER A LAND SURVEYOR
0a cENTEilt{tAL LOOp, EUGENE, OREGOil (5Ot) 686-92il
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LEE C. PLANTS, P.E., P.L.S.
EUGENE M. \^r'OBBE, P.L.S.
I-ARRYJ. BESKOW
MARVIN S. KRUSH, P.L.S.
ROBERTW. KNOX
CARLA" KNOWLES. JR.
JON E. STRINGER
LEE C. PLANTS
PROFESSIONAL ENGINEER
PROFESSIONAL LAND SURVEYOR
54 CENTENNIAL LOOP
EUGENE, OREGON 97401
503/6A6-92r1
BRANCH OFFICE:
51O KINGSWOOD STREET
FLORENCE. OREGON 97439
5o3 / 997-A411
/ M^r.h 9, 1979 Job No. 78-227
Dan Smith
City of Springfield
Building Inspector
346 Main Street
Springfield 0R 97477
I inspected the excavation and forms at the request of Rick Schmitt for the proposed
residence at 887 Sunset Drive (l-ot g, Ferncrest Subdivision), in Springfield, Oregon.
Excavation has been taken down to bedrock and properly keyed into the s1ope. The
forms conform to the shape specified in the footing design and the rebar properly
secured and tied off. The excavation and form work meets all Uniform Building Code
requirements applicable to the structure.
Very truly yours,
Lee C.nt s,P.E. , P. L.'
LCP:1aw:LJB
ENGINEERING SURVEYING PLANNING
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