Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Home
My WebLink
About
CT 2021-0005; CHINQUAPIN COASTAL HOMES; RESPONSE TO CITY OF CARSLBAD REVIEW COMMENTS; 2023-11-15
SHORING DESIGN GROUP EŽǀĞŵďĞƌϭϱ͕ϮϬϮϯ Dƌ͘DĂƌŬ ůůŝŽƚƚ KĨĨŝĐĞ;ϳϲϬͿϳϮϮͲϭϰϬϬ ůůŝŽƚƚƌŝůůŝŶŐ^ĞƌǀŝĐĞƐ͕/ŶĐ͘ &Ădž;ϳϲϬͿϳϮϮͲϭϰϬϰ ϭϯϰϮĂƌŚĂŵƌŝǀĞ ^ĂŶDĂƌĐŽƐ͕ϵϮϬϳϴ ZĞ͗ ϯϯϬŚŝŶƋƵĂƉŝŶ :KηϮϮͲϭϱϬ ĂƌůƐďĂĚ͕ĂůŝĨŽƌŶŝĂ ^ƵďũĞĐƚ͗ ZĞƐƉŽŶƐĞƚŽŝƚLJŽĨĂƌůƐďĂĚZĞǀŝĞǁŽŵŵĞŶƚƐ͕WůĂŶƐĂƚĞĚϭϭͬϭϰͬϮϬϮϯ ĞĂƌDƌ͘ ůůŝŽƚƚ͗ ^ŚŽƌŝŶŐĞƐŝŐŶ'ƌŽƵƉŝƐŝŶƌĞĐĞŝƉƚŽĨƚŚĞƉůĂŶƌĞǀŝĞǁĐŽŵŵĞŶƚƐƉƌĞƉĂƌĞĚďLJdƌƵĞEŽƌƚŚ͕ŽŶďĞŚĂůĨŽĨ ƚŚĞŝƚLJŽĨĂƌůƐďĂĚ͕ƌĞŐĂƌĚŝŶŐƚŚĞĂďŽǀĞƌĞĨĞƌĞŶĐĞĚƉƌŽũĞĐƚ͘/ŶƌĞƐƉŽŶƐĞ͕^ŚŽƌŝŶŐĞƐŝŐŶ'ƌŽƵƉ;^'Ϳ ŽĨĨĞƌƐƚŚĞĨŽůůŽǁŝŶŐƌĞƐƉŽŶƐĞƐ͗ ^dZhdhZ>KDD Ed^͗ ϭ͘dŚĞƚŽƉŽĨƉĞƌŵĂŶĞŶƚƐŚŽƌŝŶŐǁĂůůǁĂƐƌĂŝƐĞĚďĞƚǁĞĞŶƐŽůĚŝĞƌďĞĂŵƐηϭͲϭϰ͕ŝŶŽƌĚĞƌƚŽƉƌŽǀŝĚĞ ƐƵƉƉŽƌƚƚŽƚŚĞĂĚũĂĐĞŶƚǁĂůůƚŚĂƚǁĂƐĐŽŶƐƚƌƵĐƚĞĚǁŝƚŚŽƵƚĂĨŽŽƚŝŶŐŽƌŐƌŽƵƚǁŝƚŚŝŶƚŚĞĐŵƵ ĐĞůůƐ͘dŚĞƉĞƌŵĂŶĞŶƚĞdžƉŽƐĞĚŚĞŝŐŚƚŝƐŶŽǁϱ͛ͲϬ͟;ƐĞĞĞůĞǀĂƚŝŽŶǀŝĞǁͿ͕ǁŚŝĐŚďĞĐĂƵƐĞŽĨƚŚĞ ŐŽǀĞƌŶŝŶŐƚĞŵƉŽƌĂƌLJŽǀĞƌͲĞdžĐĂǀĂƚŝŽŶƌĞͲĐŽŵƉĂĐƚŝŽŶ͕ĚŽĞƐŶŽƚĞdžĐĞĞĚďĞĂŵĚĞŵĂŶĚŽƌ ĞŵďĞĚŵĞŶƚ͘ Ϯ͘dŚĞƉĞƌŵŝƚƚĞĚƐĞƚǁĂƐĂƉƉƌŽǀĞĚƵƐŝŶŐƚŚĞϮϳϱƉĐĨĂĐĐŽƌĚŝŶŐƚŽƚŚĞŐĞŽƚĞĐŚŶŝĐĂůƌĞƉŽƌƚΘǁĂƐ ƵƐĞĚƚŽĐŚĞĐŬƚŚĞƉĞƌŵĂŶĞŶƚ;ĞdžƉŽƐĞĚͿŚĞŝŐŚƚĨŽƌƚŚĞĐŽŶƐƚƌƵĐƚŝŽŶĐŚĂŶŐĞ͘ ϯ͘ůůƐŽůĚŝĞƌďĞĂŵƐǁĞƌĞĐŽŶƐĞƌǀĂƚŝǀĞůLJĚĞƐŝŐŶĞĚĨŽƌƚŚĞĂƚͲƌĞƐƚƉƌĞƐƐƵƌĞΘƐĞŝƐŵŝĐƐƵƌĐŚĂƌŐĞ ĂĐĐŽƌĚŝŶŐƚŽƚŚĞŐĞŽƚĞĐŚŶŝĐĂůƌĞƉŽƌƚ͘dŚĞƐĞŝƐŵŝĐůŽĂĚĐĂƐĞĨŽƌƚŚĞƚŝŵďĞƌůĂŐŐŝŶŐŝƐŶŽŶͲ ŐŽǀĞƌŶŝŶŐ͕ĂƐĚĞŵŽŶƐƚƌĂƚĞĚŝŶƚŚĞĂƚƚĂĐŚĞĚĐĂůĐƵůĂƚŝŽŶ͘ ^ŚŽƵůĚLJŽƵŚĂǀĞĂŶLJĂĚĚŝƚŝŽŶĂůƋƵĞƐƚŝŽŶƐŽƌĐŽŵŵĞŶƚƐƌĞŐĂƌĚŝŶŐƚŚŝƐŵĂƚƚĞƌ͕ƉůĞĂƐĞĂĚǀŝƐĞ͘ ^ŝŶĐĞƌĞůLJ͕ ^,KZ/E' ^/'E'ZKhW͕ ZŽLJW͘ZĞĞĚ͕W͘ ͘ WƌŽũĞĐƚ ŶŐŝŶĞĞƌ ŶĐůŽƐĞĚ͗dŝŵďĞƌůĂŐŐŝŶŐƐĞŝƐŵŝĐƐƵƌĐŚĂƌŐĞ THESE PLANS/DOCUMENTS HAVE BEENREVIEWED FOR COMPLIANCE WITH THEAPPLICABLE CALIFORNIA BUILDING STANDARDSCODES AS ADOPTED BY THE STATE OFCALIFORNIA AND AMENDED BY THEJURISDICTION. PLAN REVIEW ACCEPTANCE OFDOCUMENTS DOES NOT AUTHORIZECONSTRUCTION TO PROCEED IN VIOLATION OFANY FEDERAL, STATE, NOR LOCAL REGULATION. BY: _________________ DATE: ________________ True North Compliance Services, Inc. THIS SET OF THE PLANS AND SPECIFICATIONSMUST BE KEPT ON THE JOB SITE AT ALL TIMESAND IT IS UNLAWFUL TO MAKE ANY CHANGESOR ALTERATIONS WITHOUT PERMISSION FROMTHE CITY. OCCUPANCY OF STRUCTURE(S) ISNOT PERMITTED UNTIL FINAL APPROVAL ISGRANTED BY ALL APPLICABLE DEPARTMENTS. Alex Wu 11/29/2023 CT2021-0005 6KRULQJ'HVLJQ*URXS &DPLQLWR/LOLDQD 6DQ'LHJR&$ &KLQTXDSLQ (QJ 5356KHHWBBBBRIBBBB 'DWH Timber Lagging Design Lagging Geometry Lagging ['){ L ft = Soldier beam center to center space b ft = Lagging width shaft in = Min. drill shaft backfill diameter S L shaft = Lagging clear span S ft Soil Parameters ϕ deg = Internal soil friction angle c psf = Soil cohesion (Conservative) γ pcf = Soil unit weight ka tan degϕ §¨© ·¸¹ = Active earth pressure coefficient area π S = Silo cross sectional area (See figure) Lagging soil wedge functions Wz( ) area γz = Columnar silo vertical surcharge pressure fs z() kaγtan ϕ()zc = Soil column side friction ka w psf = Additional wedge surcharge pressure area ft Surcharge psfftpcf = Lateral surcharge pressure Including seismic surcharge 7LPEHU/DJJLQJ'HVLJQ[PFG] D w dz z Soil Wedge Geometry 6KRULQJ'HVLJQ*URXS &DPLQLWR/LOLDQD 6DQ'LHJR&$ &KLQTXDSLQ (QJ 5356KHHWBBBBRIBBBB 'DWH Maximum Lagging Design Pressure Summing forces vertically Fv z() Wz() wareaπ S z zfs z() ´µ¶d Summing forces horizontally Pz()ka γS ckaSurchargeFv z()ka area Given , inital guess:z ft Taking partial derivative with respect to z: z Pz()d d DFindz() γ Sc γkatan ϕ()() ft Depth to critical tension crack & maximum lagging design pressureD ft Maximum design pressure Pmax PD() = Maximum lagging pressure u u 6RLO3UHVVXUH /DJJLQJ/HQJWK IW 6R L O 3 U H V V X U H S V I Pmax psf Sectional Properties Lagging [') d in = Lagging thickness = Section modulus (Rough Sawn)Sm bd in§¨© ·¸¹ Abd in§¨© ·¸¹ = Lagging cross sectional area (Rough Sawn) 7LPEHU/DJJLQJ'HVLJQ[PFG] --v 6KRULQJ'HVLJQ*URXS &DPLQLWR/LOLDQD 6DQ'LHJR&$ &KLQTXDSLQ (QJ 5356KHHWBBBBRIBBBB 'DWH Allowable Stress Design u u u 6KHDU 0RPHQW'LDJUDPV /DJJLQJ/HQJWK IW Maximum lagging stresses Mmax M L() = Maximum bending moment Vmax V shaft() = Maximum shear force Mmax ft lbf fb Mmax Sm Vmax lbf fv Vmax A NDS Allowable Stress & Adjustment Factors Fb psi = Allowable flexural stress_NDS Table 4A Fv psi = Allowable shear stress_NDS Table 4A CD = Load duration factor_NDS Figure B1, Appendix B Cr = Repetative member factor_NDS 4.3.9 Cfu = Flat-use factor CF = Size factor Ct = Temprature factor_NDS Table 2.3.3 Ci = Incising factor CL = Beam stability factor (Flat) CF Fbpsi Maximum Design Stress CM CF Fbpsidif otherwise = Wet service factor fb psi fv psi CM 7LPEHU/DJJLQJ'HVLJQ[PFG] ................. ,, ... __ _ 6KRULQJ'HVLJQ*URXS &DPLQLWR/LOLDQD 6DQ'LHJR&$ &KLQTXDSLQ (QJ 5356KHHWBBBBRIBBBB 'DWH Tabulated Stresses Bending Stress Fb' CD CMCtCLCFCfuCiCrFb = Tabulated bending stress_NDS Table 4.3.1 Bending if fb Fb'd 2N1R*RRG() Fb'psi fb psi Bending 2N Shear Stress Fv' CD CMCtCiFv = Tabulated shear stress_NDS Table 4.3.1 Shear if fv Fv'd 2N1R*RRG() Fv'psi fv psi Shear 2N Upsize timber lagging to 6x for durability Seismic surcharge added to design case non-governing 7LPEHU/DJJLQJ'HVLJQ[PFG]