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REVIEWED BLD2022-0479+Calculations+4.14.2022_7.20.24_PM+2804139civil & structural ENGINEERING engineering & planning RECEIVED Apr 18 2022 CITY OF EDMONDS DEVELOPMENT SERVICES DEPARTMENT ......,.,.....,.....,.....,.....,.,.....,.. REVIEWED BY CITY OF EDMONDS BUILDING DEPARTMENT BLD2022-0479 STRUCTURAL CALCULATIONS Talbot Bridge Evaluation Talbot Road Edmonds, WA 98026 ,1I 5 M. `V 0� AAA tl� 10/12/2020 250 41h Ave S Ste 200 Edmonds, WA 98020 Phone: (425) 778-8500 CG Project No.: 20320.10 Fax: (425) 778-5536 Protect Location Talbot Road Edmonds, WA 98026 Protect Description The local fire district is asking for a structural evaluation of an existing 18' timber bridge in Edmonds, WA. CG Engineering will perform a site visit to observe the existing conditions, gather information, take measurements and photos, and verify the existing framing sizes and layout. We will use the information gathered on site to analyze the bridge for fire truck loading as required by the local fire district. Scope of Work Our deliverable will consist of a set of stamped structural calculations with a summary of any deficiencies. If upgrades to the bridge are required, we will identify them in the summary. This scope of work does not include the design of upgrades. If required, upgrade design would be part of a separate scope of work. Basis of Design Bridge Dead Self -weight Live Single 24k Axle or (2) 16k axles spaced at 4'-0" per AASHTO 2002 and local fire marshal recommendations Description By LS Checked ENGINEERING Project summary Scale INITS 250 4th Ave South Project Job No.. Suite 200 Edmonds, WA 98020 Talbot Bridge Evaluation 20320.10 Date Sheet No. I I (EA) 9 PL-f (AS5,ME '6=MCK) 6tgo*XS (rA) 20 Pt-r Afo cw�g ap') 5 f W AAwTb L-L LAWE LUND o. 64 �-Up OESIOM '1tiAQ-'- CO I-Ak A'yo-e 0 X ('Z-) 16K AYLE-S 4 '---oil (PER FOLLOWING PAGES) STAI 1 (.0 bG t-OUL' Description 69-1 OGE PLAM BY L-s Date Checked Date ENGINEERING Scale Sheet No. 250 4th Ave. South 7TolN;. 5uite 200 Project Edmonds, WA 98020 :TA 425.778.8500 2-0-10 www.cgengineering-com 2 From: Fitterer, Karl <kFitterer@southsnofire.org> Sent: Tuesday, August 18, 2020 2:14 PM To: Heidi Helgeson <Heidi@h2darchitects.com> Subject: RE: 8229 Talbot Road - bridge question Heidi, Sorry I missed the previous email. The National Bridge Inspection Standards states that all bridges will be inspected at two to four year intervals. Private bridges fall into a gray area when they do not attach to a public road on both ends. In order for our trucks to make access to the property the bridge was constructed to H2O AASHTO design criteria (1983 standard) We just need to have the bridge inspected to ensure that it will still meet these standards today. It is now referred to as , , Nj _, `-,.;. _ _..o... y J vV !e are not in the habit of checking when bridges are tested and again the standard is every two to four year intervals. A small sign to the effect stating that it was inspected and built to these standards will ensure that the crews will cross to fight a house fire. We just ask that a qualified engineer look for decay or fatigue of the structural members. Below is the excerpt from the FHWA and AASHTO FHWA Subpart C - National Bridge Inspection Standards Sec. 650.305 Frequency of inspections. (a) Each bridge is to be inspected at regular intervals not to exceed 2 years in accordance with section 2.3 of the AASHTO Manual. (b) Certain types or groups of bridges will require inspection at less than 2-year intervals. The depth and frequency to which bridges are to be inspected will depend on such factors as age, traffic characteristics, state of maintenance, and known deficiencies. The evaluation of these factors will be the responsibility of the individual in charge of the inspection program. (c) The maximum inspection interval may be increased for certain types or groups of bridges where past inspection reports and favorable experience and analysis justifies the increased interval of inspection. If a State proposes to inspect some bridges at greater than the specified two-year interval, the State shall submit a detailed proposal and supporting data to the Federal Highway Administrator for approval. The maximum time period between inspections shall not exceed four years. Safety is what we are looking, Thanks Karl Karl Fitterer CFI Assistant Fire Marshal 12425 Meridian Ave. S, Everett WA 98208 0: 425-771-0213 VM: 425-551-1980 KFitterer@southsnofire.orI www.southsnofire.or� 24 HIGHWAY BRIDGES 3.9 -- t;Q:} HS20-44 8,000 LBS. 32,000 LBS,* 32,600 LBSx HS15-44 6,000 LBS. 24,000 LBS. 24,000 LBS. Cf 3:1Go! 00! o i4'-0" cil V a 0.1W - 0.4W - 0AW 0.4 W W = COMBINED WEIGHT ON THE FIRST TWO AXLES WHICH IS THE SAME AS FOR THE CORRESPONDING H TRUCK, V VARIABLE SPACING — 14 FEET TO 30 FEET INCLUSIVE. SPACING TO BE USED IS THAT WHICH PRODUCES MAXIMUM STRESSES. CLEARANCE AND 2'-0" 6'-0" 2'-0" FIGURE 3.7.7A Standard HS Trucks *In the design of timber floors and orthotropic steel decks (excluding transverse beams) for H 20 Loading, one axle load of 24,000 pounds or two axle loads of 16,000 pounds each, spaced 4 feet apart may be used, whichever produces the greater stress, instead of the 32,000-pound axle shown. 'For slab design, the center line of wheels shall be assumed to be 1 foot from face of curb. (See Article 3,24.2.) CAVE A CoMfgoL5 -- UPGRADE TO PT 4X12 SELECT STRUCTURAL DECKING .wmmwwa� IDescriotion r1Cr'L!I(\Ir_ rAi (11 II ATinnIc ET, pj By LS I Date 10/8/20 Checked Date ENGINEERING Scale Sheet No. 250 4th Ave. South project TALBOT BRIDGE INSPECTION Job No. 20320.10 Suite200 Edmonds, WA 98020 425.778.8500 www.cgengineering.com Wood Beam File: calcs.ec6 Software copyright ENERCALC, INC. 1983-2020, Build:12.20.5.31 KW-06005155 CG ENGINEERINIZ DESCRIPTION: Decking -Case A- 3X12 CODE REFERENCES Calculations per NDS 2015, IBC 2015, CBC 2016, ASCE 7-10 Load Combination Set: IBC 2015 Material Properties Analysis Method: Allowable Stress Design Fb + 1500 psi E : Modulus of Elasticity Load Combination iBC 2015 Fb - 1500 psi Ebend- xx 1900 ksi Fc - Prll 1700 psi Eminbend - xx 690 ksi Wood Species : Douglas Fir - Larch Fc - Perp 625 psi Wood Grade : Select structural Fv 180 psi Ft 1000 psi Density 31.21 pcf Beam Bracing Completely Unbraced Uniform loading applied "T from Repetitive Member Stress Increase face of support for shear calculation and applied directly at face of support for moment calculation L 7.2 L 72) D 0.0050 11.250 X 2.50 11.250 X 2.50 11.250 X 2.54 11.250 X 2.50 11.250 X 2.50 Span = 2.330 ft Span = 1.830 ft Span = 4.670 ft Span = 1.50 ft Span = 1.670 ft Applied Loads Service loads entered. Load Factors will be applied for calculations. Loads on all spans... Uniform Load on ALL spans : D = 0.0050 k/ft Load for Span Number 2 Uniform Load : L = 7.20 k/ft, Extent = 0.60 » 1.230 ft, Tributary Width = 1.0 ft >I UPGRADE TO 4X12 DECKING Load for Span Number 4 Uniform Load : L = 7.20 k/ft, Extent = 0.60 » 0.90 ft, Tributary Width = 1.0 ft DESIGN SUMMARY Maximum Bending Stress Ratio = 1.092 1 Maximum Shear Stress Ratio = 0.955 : 1 Section used for this span 11.250 X 2.50 Section used for this span 11.250 X 2.50 = 1,536.81 psi = 133.36 psi = 1,407.60psi = 139.68 psi Load Combination +D+L Load Combination +D+L Location of maximum on span = 0.880ft Location of maximum on span = 1.645 ft Span # where maximum occurs = Span # 2 Span # where maximum occurs = Span # 2 Maximum Deflection Max Downward Transient Deflection 0.034 in Ratio = 646>=360 Max Upward Transient Deflection -0.132 in Ratio = 422 >=360 Max Downward Total Deflection 0.034 in Ratio = 650>=180 Max Upward Total Deflection -0.129 in Ratio = 430>=180 Vertical Reactions Support notation : Far left is #1 Values in KIPS Load Combination Support 1 Support 2 Support 3 Support 4 Support 5 Support 6 Overall MAXimum 2.055 2.607 0.991 1.102 Overall MINimum 2.035 2.596 0.975 1.090 D Only 0.021 0.012 0.016 0.012 +D+L 2.055 2.607 0.991 1.102 +D+0.750L 1.547 1.958 0.747 0.829 +0.60D 0.012 0.007 0.010 0.007 L Only 2.035 2.596 0.975 1.090 6 Software copyright ENERCALC, INC. 1983-2020, Build:12.20.5.31 DESCRIPTION: Decking -Case A 4X12 CODE REFERENCES Calculations per NDS 2015, IBC 2015, CBC 2016, ASCE 7-10 Load Combination Set: IBC 2015 Material Properties Analysis Method: Allowable Stress Design Fb + 1500 psi E : Modulus of Elasticity Load Combination iBC 2015 Fb - 1500 psi Ebend- xx 1900 ksi Fc - Prll 1700 psi Eminbend - xx 690 ksi Wood Species : Douglas Fir - Larch Fc - Perp 625 psi Wood Grade : Select structural Fv 180 psi Ft 1000 psi Density 31.21 pcf Beam Bracing Completely Unbraced Uniform loading applied "d" from Repetitive Member Stress Increase face of support for shear calculation and applied directly at face of support for moment calculation L 7.2 D(0.0050) b5aaa 11.250 X 3.50 Span = 2.330 ft 11.250 X 3.50 Span = 1.830 ft 11.250 X 3.50 Span = 4.670 ft 11.250 X 3.50 X 11.250 X 3.50 Span = 1.50 ft Span = 1.670 ft Applied Loads Service loads entered. Load Factors will be applied for calculations. Loads on all spans... Uniform Load on ALL spans : D = 0.0050 k/ft Load for Span Number 2 Uniform Load : L = 7.20 k/ft, Extent = 0.60 » 1.230 ft, Tributary Width = 1.0 ft Load for Span Number 4 Uniform Load : L = 7.20 k/ft, Extent = 0.60 » 0.90 ft, Tributary Width = 1.0 ft DESIGN SUMMARY • Maximum Bending Stress Ratio = 0.557. 1 Maximum Shear Stress Ratio Section used for this span 11.250 X 3.50 Section used for this span Load Combination Location of maximum on span = Span # where maximum occurs = Maximum Deflection Max Downward Transient Deflection Max Upward Transient Deflection Max Downward Total Deflection Max Upward Total Deflection Vertical Reactions 784.09 psi 1,407.60 psi +D+L 0.880 ft Span # 2 Load Combination Location of maximum on span Span # where maximum occurs 0.012 in Ratio = 1773>=360 -0.048 in Ratio = 1158>=360 0.012 in Ratio = 1786>=180 -0.047 in Ratio = 1184>=180 Support notation : Far left is #1 = 0.682 : 1 11.250 X 3.50 = 95.24 psi = 139.68 psi +D+L = 1.552 ft = Span # 2 Values in KIPS Load Combination Support 1 Support 2 Support 3 Support 4 Support 5 Support 6 Overall MAXimum 2.055 2.607 0.991 1.102 Overall MINimum 2.035 2.596 0.975 1.090 D Only 0.021 0.012 0.016 0.012 +D+L 2.055 2.607 0.991 1.102 +D+0.750L 1.547 1.958 0.747 0.829 +0.60D 0.012 0.007 0.010 0.007 L Only 2.035 2.596 0.975 1.090 7 Wood Beam Software copyright ENERCALC, INC. 1983-2020, Build:12.20.5.31 DESCRIPTION: Decking - Case B CODE REFERENCES Calculations per NDS 2015, IBC 2015, CBC 2016, ASCE 7-10 Load Combination Set : IBC 2015 Material Properties Analysis Method: Allowable Stress Design Fb + 1500 psi E: Modulus of Elasticity Load Combination iBC 2015 Fb - 1500 psi Ebend- xx 1900 ksi Fc - Prll 1700 psi Eminbend - xx 690 ksi Wood Species : Douglas Fir - Larch Fc - Perp 625 psi Wood Grade : Select structural Fv 180 psi Ft 1000 psi Density 31.21 pcf Beam Bracing Completely Unbraced Repetitive Member Stress Increase LD 11.250 X 2.50 Y 11.250 X 2.50 Y 11.250 X 2.50 Y 11.25O X 2.50 Y 11.250 X 2.50 Span = 2.330 ft I Span = 1.830 ft , Span = 4.670 ft , Span = 1.50 ft Span = 1.670 ft Applied Loads Loads on all spans... Uniform Load on ALL spans : D = 0.0050, L = 0.05330 klft DESIGN SUMMARY Maximum Bending Stress Ratio Section used for this span 0.098 1 11.250 X 2.50 = 162.05psi 1,656.00 psi Load Combination +D+L+H, LL Comb Run (LLL**) Location of maximum on span = 2.330ft Span # where maximum occurs = Span # 1 Maximum Deflection Max Downward Transient Deflection Max Upward Transient Deflection Max Downward Total Deflection Max Upward Total Deflection Service loads entered. Load Factors will be applied for calculations. Maximum Shear Stress Ratio Section used for this span Load Combination Location of maximum on span Span # where maximum occurs 0.032 in Ratio= 1738>=360 -0.003 in Ratio = 6982 >=360 0.035 in Ratio= 1598>=180 -0.003 in Ratio= 6469>=180 = 0.052 : 1 11.250 X 2.50 = 7.24 psi = 139.68 psi +D+L+H, LL Comb Run (L*LL*) = 4.493 ft = Span # 3 Vertical Reactions Support notation : Far left is #1 Values in KIPS Load Combination Support 1 Support 2 Support 3 Support 4 Support 5 Support 6 Overall MAXimum 0.282 0.236 0.253 0.196 Overall MINimum 0.219 0.123 0.174 0.124 +D+H 0.021 0.012 0.016 0.012 +D+L+H, LL Comb Run (****L) 0.018 0.017 -0.043 0.157 +D+L+H, LL Comb Run (***L*) 0.021 0.009 0.060 0.049 +D+L+H, LL Comb Run (***LL) 0.019 0.015 0.001 0.194 +D+L+H, LL Comb Run (**L**) -0.021 0.176 0.196 -0.043 +D+L+H, LL Comb Run (**L*L) -0.023 0.181 0.137 0.103 +D+L+H, LL Comb Run (**LL*) -0.020 0.174 0.241 -0.006 +D+L+H, LL Comb Run (**LLL) -0.022 0.179 0.181 0.140 +D+L+H, LL Comb Run (*L***) 0.065 0.066 0.012 0.013 +D+L+H, LL Comb Run (*L**L) 0.063 0.072 -0.047 0.159 +D+L+H, LL Comb Run (*L*L*) 0.066 0.064 0.056 0.051 +D+L+H, LL Comb Run (*L*LL) 0.064 0.069 -0.003 0.196 8 N '2q V. LAI0 z WD a V 20 Y.-1 C 6v- �® _ L + 5PL PL two 4o K CAL, e �� > ASSUME EXISTING CONSTRUCTION IS DOUG FIR DENSE #1 MINIMUM. EXISTING GIRDERS ACCEPTABLE FOR PROPOSED LOADING. ENGINEERING 250 4th Ave. South Suite 200 Edmonds, WA 98020 425.778.8500 www.cgengineering.com Description GIRDER CALCULATIONS By LS Date 10/8/20 Checked Date Scale Sheet No. Job No. Project TALBOT BRIDGE INSPECTION 20320.10 .01 Wood Beam DESCRIPTION: Girder - Case A CODE REFERENCES Software copyright ENERCALC, INC. 1983-2020, Build:12.20.5.31 Calculations per NDS 2015, IBC 2015, CBC 2016, ASCE 7-10 Load Combination Set: IBC 2015 Material Properties Analysis Method: Allowable Stress Design Fb + 1,550.0 psi E: Modulus of Elasticity Load Combination :IBC 2015 Fb - 1,550.0 psi Ebend- xx 1,700.0 ksi Fc - Prll 1,100.0 psi Eminbend - xx 620.0 ksi Wood Species Douglas Fir - Larch Fc - Perp 730.0 psi Wood Grade : Dense No.1 Fv 170.0 psi Ft 775.0 psi Density 31.210 pcf Beam Bracing Beam is Fully Braced against lateral -torsional buckling Span = 16.80 ft Applied Loads Service loads entered. Load Factors will be applied for calculations. Loads on all spans... Uniform Load on ALL spans : D = 0.040 klft Point Load : L = 6.0 k @ 8.40 ft DESIGN SUMMARY • Maximum Bending Stress Ratio = 0.916 1 Maximum Shear Stress Ratio = 0.322 : 1 Section used for this span 7.50 X 15.0 Section used for this span 7.50 X 15.0 = 1,135.41 psi = 43.83 psi = 1,240.00psi = 136.00 psi Load Combination +D+L Load Combination +D+L Location of maximum on span = 8.400ft Location of maximum on span = 0.000 ft Span # where maximum occurs = Span # 1 Span # where maximum occurs = Span # 1 Maximum Deflection Max Downward Transient Deflection 0.302 in Ratio = 666 >=360 Max Upward Transient Deflection 0.000 in Ratio = 0 <360 Max Downward Total Deflection 0.323 in Ratio = 623 >=180 Max Upward Total Deflection 0.000 in Ratio = 0 <180 Vertical Reactions Support notation : Far left is #1 Values in KIPS Load Combination Support 1 Support 2 Overall MAXimum 3.336 3.336 Overall MINimum 3.000 3.000 D Only 0.336 0.336 +D+L 3.336 3.336 +D+0.750L 2.586 2.586 +0.601) 0.202 0.202 L Only 3.000 3.000 10 Wood Beam Build Software copyright ENERCALC, INC. 1983-2020, BuiId:12.20.5.315.31 DESCRIPTION: Girder - Case B CODE REFERENCES Calculations per NDS 2015, IBC 2015, CBC 2016, ASCE 7-10 Load Combination Set: IBC 2015 Material Properties Analysis Method: Allowable Stress Design Fb + 1350 psi E: Modulus of Elasticity Load Combination :IBC 2015 Fb - 1350 psi Ebend- xx 1600 ksi Fc - Prll 925 psi Eminbend - xx 580 ksi Wood Species Douglas Fir - Larch Fc - Perp 625 psi Wood Grade : No.1 Fv 170 psi Ft 675 psi Density 31.21 pcf Beam Bracing Beam is Fully Braced against lateral -torsional buckling 7.50 X 15.0 Span = 16.80 ft Applied Loads Service loads entered. Load Factors will be applied for calculations. Loads on all spans... Uniform Load on ALL spans : D = 0.040 klft Point Load : L = 4.0 k @ 6.330 ft Point Load : L = 4.0 k @ 12.330 ft DESIGN SUMMARY Maximum Bending Stress Ratio = 0.941: 1 Maximum Shear Stress Ratio = 0.464 :1 Section used for this span 7.50 X 15.0 Section used for this span 7.50 X 15.0 = 1,016.55psi = 63.06 psi = 1,080.00psi = 136.00 psi Load Combination +D+L Load Combination +D+L Location of maximum on span = 6.377ft Location of maximum on span = 15.574 ft Span # where maximum occurs = Span # 1 Span # where maximum occurs = Span # 1 Maximum Deflection Max Downward Transient Deflection 0.351 in Ratio = 574 >=360 Max Upward Transient Deflection 0.000 in Ratio = 0 <360 Max Downward Total Deflection 0.374 in Ratio = 539 >=180 Max Upward Total Deflection 0.000 in Ratio = 0 <180 Vertical Reactions Support notation : Far left is #1 Values in KIPS Load Combination Support 1 Support 2 Overall MAXimum 3.893 4.779 Overall MINimum 3.557 4.443 D Only 0.336 0.336 +D+L 3.893 4.779 +D+0.750L 3.004 3.668 +0.60D 0.202 0.202 L Only 3.557 4.443 Wood Beam _" caws.aco ' Software copyright ENERCALC, INC. 1983-2020, BuiId:12.20.5.31 0.00 DESCRIPTION: Girder - Case C CODE REFERENCES Calculations per NDS 2015, IBC 2015, CBC 2016, ASCE 7-10 Load Combination Set: IBC 2015 Material Properties Analysis Method: Allowable Stress Design Fb + 875 psi E: Modulus of Elasticity Load Combination :IBC 2015 Fb - 875 psi Ebend- xx 1300 ksi Fc - Prll 600 psi Eminbend - xx 470 ksi Wood Species Douglas Fir - Larch Fc - Perp 625 psi Wood Grade : No.2 Fv 170 psi Ft 425 psi Density 31.21 pcf Beam Bracing Beam is Fully Braced against lateral -torsional buckling Applied Loads Loads on all spans... Uniform Load on ALL spans: D = 0.040, L = 0.160 k/ft Maximum Bending Stress Ratio = Section used for this span Load Combination Location of maximum on span = Span # where maximum occurs = Maximum Deflection Max Downward Transient Deflection Max Upward Transient Deflection Max Downward Total Deflection Max Upward Total Deflection Vertical Reactions b 7.50 X 15.0 Span = 16.80 ft Service loads entered. Load Factors will be applied for calculations. 0.430: 1 Maximum Shear Stress Ratio 7.50 X 15.0 Section used for this spar 301.06 psi 700.00 psi +D+L Load Combination 8.400ft Location of maximum on span Span # 1 Span # where maximum occurs 0.111 in Ratio= 1820>=360 0.000 in Ratio = 0 <360 0.138 in Ratio= 1456>=180 0.000 in Ratio = 0 <180 = 0.141 : 1 7.50 X 15.0 = 19.13 psi 136.00 psi +D+L = 0.000 ft = Span # 1 Support notation : Far left is #1 Values in KIPS Load Combination Support 1 Support 2 Overall MAXimum 1.680 1.680 Overall MINimum 1.344 1.344 D Only 0.336 0.336 +D+L 1.680 1.680 +D+0.750L 1.344 1.344 +0.60D 0.202 0.202 L Only 1.344 1.344 12 Wood Beam Build Software copyright ENERCALC, INC. 1983-2020, BuiId:12.20.5.315.31 DESCRIPTION: Girder - Case D CODE REFERENCES Calculations per NDS 2015, IBC 2015, CBC 2016, ASCE 7-10 Load Combination Set: IBC 2015 Material Properties Analysis Method: Allowable Stress Design Fb + 1550 psi E: Modulus of Elasticity Load Combination :IBC 2015 Fb - 1550 psi Ebend- xx 1700 ksi Fc - Prll 1100 psi Eminbend - xx 620 ksi Wood Species Douglas Fir - Larch Fc - Perp 730 psi Wood Grade : Dense No.1 Fv 170 psi Ft 775 psi Density 31.21 pcf Beam Bracing Beam is Fully Braced against lateral -torsional buckling Span = 16.80 ft Applied Loads Service loads entered. Load Factors will be applied for calculations. Loads on all spans... Uniform Load on ALL spans : D = 0.040 klft Point Load: L=6.0k@4.0ft DESIGN SUMMARY • Maximum Bending Stress Ratio = 0.662 1 Maximum Shear Stress Ratio = 0.476 :1 Section used for this span 7.50 X 15.0 Section used for this span 7.50 X 15.0 = 821.38 psi = 64.78 psi = 1,240.00 psi = 136.00 psi Load Combination +D+L Load Combination +D+L Location of maximum on span = 4.047ft Location of maximum on span = 0.000 ft Span # where maximum occurs = Span # 1 Span # where maximum occurs = Span # 1 Maximum Deflection Max Downward Transient Deflection 0.203 in Ratio = 991 >=360 Max Upward Transient Deflection 0.000 in Ratio = 0 <360 Max Downward Total Deflection 0.224 in Ratio = 899 >=180 Max Upward Total Deflection 0.000 in Ratio = 0 <180 Vertical Reactions Support notation : Far left is #1 Values in KIPS Load Combination Support 1 Support 2 Overall MAXimum 4.907 1.765 Overall MINimum 4.571 1.429 D Only 0.336 0.336 +D+L 4.907 1.765 +D+0.750L 3.765 1.407 +0.601) 0.202 0.202 L Only 4.571 1.429 13 14