2012-08-01 22:23:35 | BUILDING PLAN REVIEW |
| *******DENIED******* |
| ROBERT BROWN (561) 805 6652 |
| E-MAIL: [email protected] |
| |
| FBC = FLORIDA BUILDING CODE 2010 |
| FBC*= FLORIDA BUILD'G CODE (CITY AMEND) |
| F.S.= FLORIDA (STATE) STATUTE |
| |
| ***PLEASE ADDRESS THE COMMENTS FROM THE 7/25/12 REVIEW |
| BY SAMANTHA HILL. SPECIFICALLY TO ADDRESS THE COMMENT |
| REGARDING THE STRUCTURAL ANALYSIS OF THE PRIMARY BEAM |
| MEMBERS PLEASE ALSO RESPOND TO THE FOLLOWING: |
| |
| 1) FBC 2002.4 LOADS. |
| THE SUBMITTED CALCULATIONS FROM SUNCOAST ARCHITECTURE & |
| ENGINEERING: |
| (A) THE WIND PRESSURES UNDER "WIND ZONE CORRECTED FOR |
| ASD & 18/14 SCREEN" ARE SHOWN AS BEING EXPRESSED IN |
| PSI, SHOULD THAT BE PSF? |
| (B) THE CALCULATIONS DO NOT STATE WHAT THE UNITS OF |
| MEASURE ARE USED TO EXPRESS THE BENDING MOMENT IN THE |
| BEAMS. FOR EXAMPLE, FOR THE "CENTER MANSARD SPAN", THE |
| "MOMENT DUE TO VERTICAL PRESSURE" IS STATED AS 10,091. |
| IS THAT MOMENT OF 10,091 BEING EXPRESSED IN FT-LBS OR |
| KIPS? |
| (C) WHAT ARE THE VALUES USED IN THE EQUATION W L ^2 / |
| 12 THAT GIVE THE MOMENT OF 10.091? |
| (D) THE "TOTAL OF ALL MANSARD MOMENTS" SEEMS TO HAVE |
| BEEN CALCULATED BY SUMMING THE MOMENTS ON THE "WINDWARD |
| MANSARD LEG", THE "CENTER MANSARD SPAN", AND THE |
| "LEEWARD MANSARD LEG". THE "MOMENT DUE TO HORIZONTAL |
| LEEWARD PRESSURE" ON THE "LEEWARD MANSARD LEG" HAS BEEN |
| SUBTRACTED FROM THE OTHER MOMENTS. BECAUSE IT HAS BEEN |
| SUBTRACTED, THIS IS MUST HAVE BEEN CONSIDERED A |
| "NEGATIVE" BENDING MOMENT. HOWEVER THE MAXIMUM VALUE OF |
| THAT NEGATIVE MOMENT DOES NOT OCCUR AT THE SAME SECTION |
| OF THE BEAM AS ANY OF THE OTHER MOMENTS. IN FACT THE |
| FIVE BENDING MOMENTS, THAT HAVE BEEN SUMMED IN ORDER TO |
| ARRIVE AT THE "TOTAL OF ALL MANSARD MOMENTS" ,WILL |
| OCCUR AT FIVE DIFFERENT PLACES ALONG THE BEAM. PLEASE |
| EXPLAIN THE APPROACH USED TO DETERMINE THE MAXIMUM |
| MOMENT. THIIS REQUEST IS ALSO RELATED TO (E) BELOW. |
| (E) THERE IS NO POST OR OTHER ELEMENT PROVIDING |
| VERTICAL SUPPORT TO THE TOP OF THE MANSARD, YET WHEN |
| CALCULATING THE MOOMENT DUE TO VERTICAL PRESSURE THE |
| BEAM SPAN HAS NOT BEEN TAKEN AS 29 FEET 7 INCHES WHICH |
| IS THE DISTANCE BETWEEN THE POST AND THE STRUCTURAL |
| GUTTER ON THE HOUSE. THE ADOPTED APPRAOCH IS NOT A |
| TYPICAL METHOD OF ANALYZING THE BENDING MOMENT ON THE |
| BEAM. PLEASE EXPLAIN THE APPROACH USED. THIS COMMENT IS |
| ALSO RELATED TO (D) ABOVE. |
| (F) LOOKING AT THE "COMPRESSION IN THE MANSARD BEAM", |
| WHAT ARE THE VALUES USED IN THE EQUATION (WALL AREA X |
| HORIZONTAL PRESSURE)/2 THAT GIVE A COMPRESSION OF 1,057 |
| LBS? |
| (G) THE MANSARD BEAM DEFLECTION IS STATED AS 0.05. THIS |
| MUST BE ASSUMED TO BE EXPRESSED IN INCHES SINCE IT IS |
| BEING COMPARED TO AN "ALLOWABLE DEFLECTION" OF 2.02. |
| PLEASE STATE WHAT DEFLECTION EQUATION AND VALUES ARE |
| USED TO ARRIVE AT A MANSARD BEAM DEFLECTION OF JUST |
| 0.05 INCHES. |
| |
| **QUOTE PERMIT# ON ALL CORRESPONDENCE** |
| |
| END OF REVIEW COMMENTS |
| THE CODE REFERENCES GIVE ADDITIONAL INFO |
| TELEPHONE: (561) 805 6652 ROBERT BROWN |
| E-MAIL: [email protected] |