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. Click [Add]and the Virtual Load Case Story Forces dialog box will open. The above load combinations are based on ASCE7-10 and UBC-97. Plan view of 3-D parapet wall corner drift . on multiple factors, including: n. Ground snow load value. Some Properties of Snow Specified Snow Load [4.1.6.2] S = … It is the building designer's responsibility to supply snow drift loading information. All buildings should be designed for uniform snow load as there will always be an element of distributed snow, even if some drifting occurs. Building Component. snow load by the appropriate snow load shape coefficient (see section 5.3 of BS EN 1991-1-3 and Annex B of BS EN1991-1-3). Control of Snow Drifting about Buildings. See Section 7.9, ASCE 7. 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 • Uniform snow loading • Snow drift. Concerning snow drifting, O’Rourke and Cocca (2018) developed parameters to quantify the influence of wind. Schaerer. For the Roof Level Type 100in the Force column (100 can also be used for SI models). To define the virtual load cases for analyzing roof drift: 1. The webinar will provide a detailed review of the current ASCE 7 provisions for snow drift loading as well as expected future improvements. Type VXin the Label edit box. 3. The IBC code has also a recommended load and load combinations, grab your copy here. G-5) Snow Drift Load (Obstruction) — (Fig. Dist. Ground Snow Load, pg: psf: Figure 7-1, pages 84-85 and Table 7-1, page 92: Length of High Roof, Lu: ft. The Snow/Wind Load dialog has conditions for which snow/wind loads are generated: Envelope - Defines those structure elements for which snow and wind loads will be generated. Concerning snow drifting, O’Rourke and Cocca (2018) developed parameters to quantify the influence of wind. The maximum drift load is. Leave the Dir. … Seismic. In this area high uniform loads as well as high drift loads occur. © 2009–2021 Modulo Software Inc. All Rights Reserved, Snow Drift Load (Obstruction) — (Fig. The peak drift height, h … It is a required parameter for defining global snow and wind coefficients of a … ... presence of parapet, valley or higher construction, ...) and distributed in multiplying by the cosine of the angle of the roof. but it does not need to exceed 30 psf. n. Importance, occupancy, and use of the building . In the event of discrepancies, Part 4 and the Structural Commentaries of the NBCC 2005 shall govern. Fig I-7 Fig I-8 Fig I-23. Primary Structure - Fig 4.1.7-6 A Walls - Fig 4.1.7.6-B. Some buildings, especially those with obstructions against which the snow could accumulate such as parapets or walls, should also be designed for snow drift loading. Roof snow load is defined as the weight of snow on the roof surface used in design of the building structure (IBC, 2012). Check for loads due to snow sliding from an upper roof. v~��6``�26��b`V��Rpwu�ɐ�a�Nn��Z���@�"0P(� ����f�W� ��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 Drifting about buildings ranges from a slight nuisance to a situation where it is the load! 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