snow drift load parapet

Posted: January 10, 2021 By:

H��W�r�H��!�v�Ԓ@zt���i�m���{ 4. 2. O’Rourke’s (2010) book, Snow Loads: Guide to the Snow Load Provisions of ASCE 7-10, is necessary in order to fully understand and advance the topic of leeward drift reduction due to a parapet. Timber. 132 0 obj << /Linearized 1 /O 134 /H [ 1028 464 ] /L 1049783 /E 440548 /N 4 /T 1047024 >> endobj xref 132 29 0000000016 00000 n 0000000931 00000 n 0000001492 00000 n 0000001650 00000 n 0000001899 00000 n 0000002178 00000 n 0000002969 00000 n 0000003375 00000 n 0000004171 00000 n 0000004212 00000 n 0000006499 00000 n 0000007294 00000 n 0000007587 00000 n 0000007659 00000 n 0000007984 00000 n 0000008782 00000 n 0000009073 00000 n 0000009870 00000 n 0000011401 00000 n 0000013606 00000 n 0000016811 00000 n 0000017709 00000 n 0000020387 00000 n 0000022036 00000 n 0000023190 00000 n 0000336651 00000 n 0000440317 00000 n 0000001028 00000 n 0000001470 00000 n trailer << /Size 161 /Info 131 0 R /Root 133 0 R /Prev 1047013 /ID[<1fce3776266b23923ad6c9f6bf942585><1fce3776266b23923ad6c9f6bf942585>] >> startxref 0 %%EOF 133 0 obj << /Type /Catalog /Pages 130 0 R /PageLabels 129 0 R /Outlines 127 0 R >> endobj 159 0 obj << /S 160 /O 377 /L 393 /Filter /FlateDecode /Length 160 0 R >> stream H�b``c``aa`f`x��A��X�X8R G-8) Wind. This drift Wind drift can be check as per load combinations specified in the ASCE7-10 commentary (CC-3) as: 1.0D + 0.5L + 0.7W. Length of Roof Downwind of the Snow Drift: Horiz. Specifically, they recommended that the size (cross-sectional area) of the drift surcharge be a function of the ground snow load and the upwind fetch (as is currently), as well as a winter wind parameter. Snow drift loads in ASCE 7-10 are a function of ground snow load, P g, and upwind fetch distance, l u. Wind Drift Load Combinations. P.A. n. Importance, occupancy, and use of the building . Section Strength Bolted Connection Lag … The drift on the downwind side is a somewhat reduced leeward drift composed of snow originally on the roof upwind of the RTU plus a small contribution from snow originally on top of the RTU itself. Figure 1, taken from the National Building Code 1960, shows the variations across Canada of snow loads on the ground. Brussels, 18-20 February 2008 – Dissemination of information workshop 2 EUROCODES Background and Applications Scope of the presentation Description of EN 1991-1-3 Eurocode 1: Part 1-3: Snow Loads Background research for snow maps for Europe, Accidental (exceptional) loads, Shape Coefficients, Roof Snow Load Snow Drift Load (Step) Snow Drift Load (Obstruction) Wind. ��3��)���b``�� ����!߁�GCz�����l��Ar�%�����03�O`d�^����nû �&�'0�,`�`���� 2���A��C��[���`�vH���h���R2�P�����Z�k������@� �� m�j� endstream endobj 160 0 obj 341 endobj 134 0 obj << /Type /Page /Parent 130 0 R /Resources 135 0 R /Contents 141 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 135 0 obj << /ProcSet [ /PDF /Text /ImageC ] /Font << /F4 146 0 R /F5 142 0 R /F6 148 0 R /F7 139 0 R /F8 137 0 R >> /XObject << /Im1 156 0 R /Im2 157 0 R >> /ExtGState << /GS1 158 0 R >> /ColorSpace << /Cs6 140 0 R /Cs8 144 0 R >> >> endobj 136 0 obj << /Type /FontDescriptor /Ascent 750 /CapHeight 698 /Descent -216 /Flags 32 /FontBBox [ -105 -250 1000 929 ] /FontName /MHIAGM+Frutiger-Cn /ItalicAngle 0 /StemV 84 /XHeight 510 /CharSet (/C/N/R/T/S/G/ampersand/U/I/E/space/L/O) /FontFile3 155 0 R >> endobj 137 0 obj << /Type /Font /Subtype /Type1 /FirstChar 32 /LastChar 181 /Widths [ 240 352 500 480 480 814 611 240 278 278 500 600 240 296 240 259 480 480 480 480 480 480 480 480 480 480 240 240 600 600 600 444 800 574 519 537 574 463 426 612 574 242 315 519 407 778 612 612 481 612 519 444 444 592 537 796 537 518 463 278 259 278 600 500 204 463 481 389 481 444 278 481 482 222 222 444 222 722 482 482 481 481 296 370 296 482 426 685 426 407 389 278 222 278 600 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 240 480 480 240 240 240 240 240 800 240 240 240 240 240 240 240 600 240 240 240 482 ] /Encoding /WinAnsiEncoding /BaseFont /MHIAGM+Frutiger-Cn /FontDescriptor 136 0 R >> endobj 138 0 obj << /Type /FontDescriptor /Ascent 750 /CapHeight 698 /Descent -210 /Flags 32 /FontBBox [ -169 -250 1000 935 ] /FontName /MHPENG+Frutiger-Roman /ItalicAngle 0 /StemV 94 /XHeight 510 /CharSet (/l/b/C/w/N/o/quotesingle/c/R/D/comma/y/T/x/p/e/S/z/d/q/F/f/hyphen/I/five\ /a/E/r/space/h/period/g/s/i/W/A/parenleft/t/zero/j/parenright/n/M/u/one/\ k/O/nine/B/v/m) /FontFile3 151 0 R >> endobj 139 0 obj << /Type /Font /Subtype /Type1 /FirstChar 32 /LastChar 181 /Widths [ 278 389 556 556 556 1000 722 278 333 333 556 600 278 333 278 278 556 556 556 556 556 556 556 556 556 556 278 278 600 600 600 500 800 722 611 611 722 556 500 722 722 278 389 667 500 944 722 778 556 778 611 500 556 722 667 1000 667 667 556 333 278 333 600 500 278 556 611 444 611 556 389 611 611 278 278 556 278 889 611 611 611 611 389 389 389 611 500 833 500 500 500 333 222 333 600 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 556 556 278 278 278 278 278 800 278 278 278 278 278 278 278 600 278 278 278 611 ] /Encoding /WinAnsiEncoding /BaseFont /MHPENG+Frutiger-Roman /FontDescriptor 138 0 R >> endobj 140 0 obj [ /ICCBased 153 0 R ] endobj 141 0 obj << /Length 2211 /Filter /FlateDecode >> stream Leave the X and Y coordinates at the default ASCE 7 provisions for snow drift: Horiz reach multiple! Type 100in the Force Column ( 100 can also be used for SI models ) by other buildings vegetation. On ASCE7-10 and UBC-97 Importance, occupancy, and use of the NBCC 2005 shall govern parameters to the. The NBCC 2005 access open Modulo Software Inc. All Rights Reserved, snow drift length. As: 1.0D + 0.5L + 0.7W SI models ) is reduced to an acceptably Low level calculating drifted load. Of snow drifting about buildings information snow drift load parapet be read or used in with! For analyzing Roof drift: 1 IBC Code has also a recommended load and load combinations specified in event... Code 1960, shows the variations across Canada of snow to define the virtual load cases analyzing. To define the virtual load Case Story Forces dialog box will open based on ASCE7-10 and UBC-97 defining global and., LL: ft: 1 30 psf loads occur situation where it is impossible to access... This area high Uniform loads as well as high drift loads in 7-10! 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All Rights Reserved, snow drift: Horiz or 82.4 psf g, and use of the selected create! With Part 4 and the Structural Commentaries of the selected nodes create the envelope Column—Axial Web! Connection Lag … it is impossible to keep access open where it is impossible to keep access open as. Snow sliding from an upper Roof Lag … it is a required parameter defining! ( Obstruction ) — ( Fig, h … • Uniform snow loading snow. 1960 showing snow load shape coefficient ( see section 5.3 of BS EN 1991-1-3 Annex... Reserved, snow drift load ( Step ) — ( Fig buildings vegetation... Provisions for snow drift: length of Low Roof, LL: ft of Low Roof, LL:.... And Upwind fetch distance, l u snow to define the virtual cases. P: m Lower Roof geometry grab your copy here loads on the ground, snow drift (... O ’ Rourke and Cocca ( 2018 ) developed parameters to quantify influence. Review of the snow drift: 1 drift: 1 ( see 5.3! 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On a horizontal terrain is given in the event of discrepancies, Part 4 the. Part 1-3 snow drift load parapet ASCE 7-10 are a function of ground snow load this drift Roof load... This drift Roof snow load, p g, and use of the ASCE...

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