7. Wind load
7.6 Crosswind vibration
7.6.1 For round section structure, crosswind vibration (swirl desquamation) for different Reynolds number Re shall be checked according to the following provisions.
1 When Re<3×105 and the top wind speed υH of the structure is greater than υcr, subcritical breeze sympathetic vibration may occur. By then, anti-vibration measures may be adopted on the structure or the critical wind velocity υcr of the structure may be controlled to be no less than 15m/s.
2 When Re≥3.5×106 and 1.2 times of the top wind speed υH of the structure is greater than υcr, over- critical fresh gale sympathetic vibration may occur; by then, resonance effect caused by crosswind load shall be considered by Article 7.6.2.
3 When the Reynolds number is 3×105≤Re<106, supercritical wind vibration may occur, and it may not be treated.
4 Reynolds number Re may be determined by the following formula:
Re=69000υD (7.6.1-1)
Where
υ——Wind speed for calculation, it may take υcr value;
D——Diameter of the structural section (m)
vH=
Ti——Natural vibration period of the structural vibration mode i; when checking the subcritical breeze sympathetic vibration, it takes basic natural vibration period T1;
St——Strouhal number, it takes 0.2 for circular sectional structure;
µH——Variation coefficient of the wind pressure height on top of the structure;
w0——Basic wind pressure (kN/m2);
ρ——Air density (kg/m3)
6 When the structure is reduced along the height section (inclination pitch is no greater than 0.02), diameter at 2/3 structural height may be approximately adopted.
7.6.2 The equivalent wind loads of vibration mode j caused by over-critical fresh gale sympathetic vibration at the height z may be determined by the following formula:
Wczj=|λj|vcr2φzj/12800ξj（KN/m2） (7.6.2-1) Initial point height H1 of the critical wind velocity shown in Table 7.6.2 may be determined by the following formula:
H1=H× a
α——Ground roughness index, they are 0.12, 0.16, 0.22 and 0.30 for A-type, B-type, C-type and D-type respectively;
υH——Wind speed on top of the structure (m/s)
Note: when checking the crosswind vibration, high vibration mode No. considered is no greater than 4, and it may take the first or second vibration mode for general cantilever-type structure.
Table 7.6.2 Table for λj Calculation H1/H
7.6.3 When checking crosswind vibration, the gross effect of wind loads may determine the crosswind load effect S and downwind load effect S by the following formula:
Appendix A Deadweight of Commonly-used Materials and Members
Table A.1 Deadweight of Commonly-used Materials and Members
Item Deadweight Remarks
1. Timber (kN/m3)
Cedar wood 4 Varying according to water ratios
Fir, spruce, Korean pine, China Armand pine, hemlock, Mongolian
Scotch Pine, alder, toon, poplar, Chinese ash 4-5 Varying according to water ratios Chinese red pine, Burma pine, Chinese pine, red pine, Guangdong
pine, alder, sweetgum, wear the willow, common sassafras, Qinling Mountain larch and Xinjiang larch
5-6 Varying according to water ratios
Northeast larch, Dacrydium cupressinum, elm, birch, Manchurian
ash, chinaberry, ailanthus 6-7 Varying according to water ratios
Holm oak, Chinese locust 7-8 Varying according to water ratios Oak, eucalyptus, beefwood 8-9 Varying according to water ratios Common wooden batten, sandal wood 5 Varying according to water ratios
Sawdust 2-2.5 With preservatives, 3kN/m3
Fiber board 4-5
Cork board 2.5
Chipboard 6
2. Peeler ( kN/m2)
Veneer three-ply ( poplar) 0.019 Veneer three-ply ( basswood) 0.028
Veneer three-ply ( Manchurian ash) 0.028 Veneer five-layer plywood ( poplar) 0.03 Veneer five-layer plywood ( basswood) 0.034 Veneer five-layer plywood ( Manchurian ash) 0.04
Cane fiber board (counted based on 10mm) 0.03 Commonly-used thicknesses are 13mm, 15mm, 19mm and 25mm
Sound screen (counted based on 10mm) 0.03 Commonly-used thicknesses are
Cast iron 72.5
Wrought iron 77.5
Iron ore scrap 27.6
Hematite 25-30
Steel 78.5
Tough pitch, red copper 89
Brass, gunmetal 89
Sulphide copper ore 42
Aluminium 27
Aluminium alloy 28
Zinc 70.5
Sub-zinc mine 40.5
Lead 114 Galena 74.5
Gold 193 Platinum 213
Silver 105 Tin 73.5
Nickel 89 Mercury 136 Tungsten 189 Magnesium 18.5
Antimony 66.6 Crystal 29.5
Borax 17.5
Sulphur ore 20.5
Asbestos mine 24.6
Asbestos 10 Compaction
Thin stockpile φ=40°
Gypsum powder 9
4. Earth, Sand, Grit, Rock ( kN/m3)
Humus soil 15-16 Dry, φ=40°; wet, φ=35°, extremely wet, φ=25°
Clay 13.5 Dry, soft, void ratio is 1.0
Clay 16 Dry, φ=40°, compaction
Clay 18 Wet, φ=35°, compaction
Clay 20 Extremely wet, φ=25°, compaction
Grit 12.2 Dry, soft
Sandy soil 16 Dry, φ=35°, compaction
Sandy soil 18 Wet, φ=35°, compaction
Sandy soil 20 Extremely wet, φ=25°, compaction
Sandy soil 14 Dry, fine sand
Sandy soil 17 Dry, fine sand
Pebble 16-18 Dry
Clay with pebble 17-18 Dry, soft
Sand with pebble 15-17 Dry, soft
Sand with pebble 16-19.2 Dry, compaction
Sand with pebble 18.9-19.2 Wet
Pumice 6-8 Dry
Pumice filling materials 4-6
Sandstone 23.6
Shale 28
Shale 14.8 Slabstone stow
Marlstone 14 φ=40°
Granite, marble 28
Granite 15.4 Slabstone stow
Limestone 26.4
Limestone 15.2 Slabstone stow
Mussel bed 14
Toniciidae 27.6 Basalt 29.5 Feldspar 25.5 Hornblende, verdantique 30
Hornblende, verdantique 17.1 Slabstone stow
Blinding 14-15 Stow
Rock meal 16 Clay nature or limy
Bubbly clay 5-8 Filling material, φ=35°
Kieselguhr filling material 4-6
Diabase board 29.5
5. Brick and Brickbat (kN/m3)
Common brick 18 240mm×115mm×53mm(684 pieces/m3)
Common brick 19 Made by machine
Clinker 21-21.5 230mm×110mm×65mm (609 pieces/m3)
Red clinker 20.4
Firebrick 19-22 230mm×110mm×65mm(609 pieces/m3)
Acidproof ceramic tile 23-25 230mm×113mm×65mm(590 pieces/m3)
Sand-lime brick 18 Sand: ash= 92:8
Cinder block 17-18.5
Slag brick 18.5 Hard slag: soot: lime = 75:15:10
Breeze brick 12-14
Soot brick 14-15 Slag: carbide slag: soot=30:40:30
Clay butt 12-15
Sawdust brick 9
Cinder hollow block 10 290mm×290mm×140mm(85 pieces/m3)
Cement hollow tile 9.8 290mm×290mm×140mm(85 pieces/m3) Cement hollow block 10.3 300mm×250mm×110mm(121 pieces/m3) Cement hollow block 9.6 300mm×250mm×160mm(83 pieces/m3)
Press-powder coal ash aerocrete block 5.5
Concrete hollow small block 11.8 390mm×190mm×190mm
Rubble 12 Stow
Cement tile 19.8 200mm×200mm×24mm(1042 pieces/m3)
Porcelain facing brick 19.8 150mm×150mm×8mm(5556 pieces/m3)
Ceramic mosaic 0.12kN/m2 Thickness 5mm
6. Lime, Cement, Mortar and Concrete ( kN/m3)
Quicklime block 11 Stow, φ=30°
Quicklime powder 12 Stow, φ=35°
White lime cream 13.5
Lime mortar, cement lime mortar 17
Cement, lime, cinder, mortar 14
Calcareous slag 10-12
Cement slag 12-14
Cement, cinder, mortar 13
Lime soil 17.5 Lime: earth =3:7, tamping
Straw lime slurry 16
Paper lime slurry 16
Lime sawdust 3.4 Lime: sawdust=1:3
Lime concrete 17.5 Lime, grit, pebble
Cement 12.5 Lightweight incoherence, φ=20°
Cement 14.5 Bulkload, φ=30°
Cement 16 In bags, compaction, φ=40°
Slag cement 14.5
Cement mortar 20
Cement, grout 5-8
Asbestos cement mortar 19 Expanded perlite mortar 7-15
Gypsum mortar 12
Rubble concrete 18.5
Breeze concrete 10-14 For filling Iron-aggregate concrete 28-65
Pumice concrete 9-14
Bituminous concrete 20
Macroporosity concrete without sand 16-19
Foamed concret 4-6
Aerocrete 5.5-7.5 Monolith
Reinforcement concrete 24-25 Rubble reinforced concrete 20
Steel-web cement 25 For load-carrying members
Water glass acid proof concrete 20-23.5
Pulverized fuel ash pottery pebble
concrete 19.5
7. pitch, coal ash, butter grain (kN/m3)
Petroleum asphalt 10-11 According to relative density Tar 12
Coal pitch 13.4
Coal tar 10
Anthracite 15.5 Whole
Anthracite 9.5 Massive stockpile, φ=30°
Anthracite 8 Shiver stockpile, φ=35°
Tobacco smalls 7 Stockpile, φ=15°
Coal briquette 10 Stockpile
Lignite 12.5
Lignite 7-8 Stockpile
Turf 7.5
Turf 3.2-3.4 Stockpile
Xylanthrax 3-5
Plumbago 20.8
Coal wax 9
Oil wax 9.6
Crude oil 8.8
Kerosene 8
Kerosene 7.2 In bulk, relative density 0.82-0.89
Lubricating oil 7.4
Gasoline 6.7
Gasoline 6.4 In bulk, relative density 0.72-0.76 Animal oil, vegetable oil 9.3
Bean oil 8 Large barrel, per barrel 360kg
8. Misc ( kN/m3)
Simple glass 25.6
Steel glass 26
Cellular glass 3-5
Glass wool 0.5-1 For insulating layer filling material
Rock wool 0.5-2.5
Pitch glass wool 0.8-1 coefficient of heat conductivity 0.035- 0.047 [ W/( m·K)]
Glass wool board ( pipe socket) 1-1.5 coefficient of heat conductivity 0.035- 0.047 [ W/( m·K)]
Fiberglass reinforced plastics 14-22
Slag wool 1.2-1.5 Incoherence, coefficient of heat conductivity 0.031- 0.044 [ W/( m·K)]
Slag wool manufactured product (board,
brick and tube) 3.5-4 coefficient of heat conductivity 0.041- 0.052 [ W/( m·K)]
Asphalt slag wool 1.2-1.6 coefficient of heat conductivity 0.041- 0.052 [ W/( m·K)]
Asphalt slag wool 1.2-1.6 coefficient of heat conductivity 0.041- 0.052 [ W/( m·K)]
Expanded perlite powder lot 0.8-2.5 Dry, soft, coefficient of heat conductivity 0.052- 0.076 [ W/( m·K)]
Cement perlite products 3.5-4 Intensity 1N/mm2, soft, coefficient of heat conductivity 0.058- 0.081 [ W/( m·K)]
Expanded vermiculite 0.8-2 coefficient of heat conductivity 0.052- 0.07 [ W/( m·K)]
Polyvinyl choride board (tube) 13.6-16
Polystyrene foam 0.5 coefficient of heat conductivity no greater than 0.035 [ W/( m·K)]
Asbestos board 13 Water ratio no greater than 3%
Emulsified asphalt 9.8-10.5
Flexible rubber 9.3
White phosphorus 18.3
Rosin 10.7 Magnetism 24
Alcohol 7.85 100% (net)
Alcohol 6.6 In bulk, relative density 0.79-0.82
Hydrochloric acid 12 Concentration 40%
Nitric acid 15.1 Concentration 91%
Vitriol 17.9 Concentration 87%
Alkali 17 Concentration 60%
Ammonium chloride 7.5 Stockpile in bags
Urea 7.5 Stockpile in bags
Ammonium bicarbonate 8 Stockpile in bags
Water 10 The maximum density at 4℃
Ice 8.96 Books 5
Glazed printing paper 10
Newspaper 7
Rice paper 4
Cotton, cotton yarn 4 Weight in average when impacted
Straw 1.2 Debris from demolition ( builders
rubbish) 15
Wheat 8 φ=25°
Flour 7
Corn 7.8 φ=28°
Millet, sorghum 7 Bulkload
Millet, sorghum 6 In bags
Sesame 4.5 In bags
Fresh fruit 3.5 Bulkload
Fresh fruit 3 Encasement
Peanut 2 With shells, in bags
Tin can 4.5 Encasement
Vino, soy sauce, oil, vinegar 4 In bottles and encasement
Bean cake 9 Round-cake placement, each piece 28kg
Rock salt 10 In bulk
Salt 8.6 Granule loose keeping
Salt 8.1 In bags
Granulated sugar 7.5 Bulkload
Granulated sugar 7 In bags
10. Masonry Envelope ( kN/m3)
Grout ashlar 26.4 Granite, square fossil
Grout ashlar 25.6 Limestone
Grout ashlar 22.4 Sandstone
Grout rubble ashlar 24.8 Granite, level on the upper and lower surface
Grout rubble ashlar 24 Limestone
Grout rubble ashlar 20.8 Sandstone
Dry building of stone 20.8 Granite, level on the upper and lower surface
Dry building of stone 20 Limestone
Dry building of stone 17.6 Sandstone
Building of common bricks 18
Grouting brick 19
Building of clinkers 21
Adobe block brickwork 16 Clay brick hollow bucket masonry
envelope 17 Filling smashed debris in the center
Clay brick hollow bucket masonry
envelope 13 Full
Clay brick hollow bucket masonry
envelope 12.5 No load
Clay brick hollow bucket masonry
envelope 15 Able to bear load
Pulverized fuel ash spume block masonry
envelope 8-8.5 Pulverized fuel ash: carbide slag: debris cream=74:22:4
Concrete 17 Ash: sand: earth=1:1:9-1:1:4
11. Partition and Wall Face (kN/m2)
Bifacial rendering lath partition 0.9 Thickness of line on each face: 16-24mm, keel included Pedion rendering lath partition 0.5 Thickness of line: 16-24mm, keel included
0.27 Two layers of 12mm paper cream boards, no insulating layer
0.32 Two layers of 12mm thistle board, with 50mm rock heated boards filled in the center
0.38 Three layers of 12mm thistle board, no insulating layer
0.43 Three layers of 12mm thistle board, with 50mm rock wool heated boards filled in the center
0.49 Four layers of 12mm thistle board, no insulating layer C-format lightgage steel joist partition
0.54 Four layers of 12mm thistle board, with 50mm rock heated boards filled in the center
Tiling wall face 0.5 Thickness 25mm, compo foundation included Cement printed wall face 0.36 Thickness 20mm, cement grit
Terrazzo wall face 0.55 Thickness 25mm, foundation included Hydroborocalcife wall face 0.5 Thickness 25mm, foundation included
Lime grit whitewash 0.34 Thickness 20mm
Steel roof truss 0.12+0.011×span No scuttle, including supports, counted based on the horizontal projected area of roof, span (L) in m Wooden frame glazing 0.2-0.3
Steel-frame glazing 0.4-0.5
Wood door 0.1-0.2
Steel-iron door 0.4-0.5
13. Roof (kN/m2)
Clay plain tile roofing 0.55 Counted according to real area, the same in the following Cement plain tile roofing 0.5-0.55
Small grey tile roofing 0.9-1.1
Tile roofing 0.5
Slate roofing 0.46 Thickness 6.3 mm
Slate roofing 0.71 Thickness 9.5mm
Slate roofing 0.71 Thickness 12.1mm
Wheat straw marl roof 0.16 Counted in thickness of 10mm
Asbestos board tile 0.18 The deadweight of tile
Corrugated asbestos sheet 0.2 1820mm×725mm×8mm
Galvanized sheet metal 0.05 No.24
Corrugated iron 0.05 No.26
Color steel plate pantile 0.12-0.13 0.6mm color steel plate
Arch-form color steel plate roofing 0.3 Including incubation and weight of light fixtures, 0.15kN/m2
Lucite roofing 0.06 Thickness 1.0mm
Glass roof 0.3 9.5mm, deadweight of wire glass and frames included
Glass brick roof 0.65 Deadweight of frames included 0.05 Brushing oil twice for each layer of linoleum
0.25-0.3 For four layers, twice brushing of oil on each, with handstone spreading on
0.3-0.35 For six layers, three brushing of oil on two, with handstone spreading on
Linoleum waterproof layer (modified asphalt waterproof coiled material
included)
0.35-0.4 For eight layers, four brushing of oil on three, with
14. Hover (kN/m2) Steel-web plastering suspended ceiling 0.45
Staff lathed ceiling 0.45 Average thickness of lime: 20mm, suspending wood included
Grit firring hover 0.55 Average thickness of lime: 25mm, suspending wood included
Reed plastered ceiling 0.48 Suspending wood included
Dealt hover 0.25 Suspending wood included
Three-ply hover 0.18 Suspending wood included
Straw board hover 0.15 Suspending wood and weather strips included
Fiber board suspended ceiling 0.26 Thickness 25mm, suspending wood and weather strips included
Fiber board suspended ceiling 0.29 Thickness 30mm, suspending wood and weather strips included
Acoustic celotex board hover 0.17 Thickness 10mm, suspending wood and weather strips included
Acoustic celotex board hover 0.18 Thickness 13mm, suspending wood and weather strips included
Acoustic celotex board hover 0.2 Thickness 20mm, suspending wood and weather strips included
0.12 One layer of 9mm thistle board, no insulating layer
0.17 One layer of 9mm thistle board, with 50mm rock wool board insulating layers
0.20 Two layers of 9mm thistle boards, no insulating layer V-mode lightgage steel joist suspended
ceiling
0.25 Two layers of 9mm thistle boards, with 50mm rock wool board insulating layers
V-mode lightgage steel joist and
aluminium alloy joist suspended ceiling 0.1-0.12 One layer of 15mm mineral wool abatvoix, no insulating layer
Cinder sawdust insulating layer on the
hover 0.2 Thickness 50mm, mixture of cinder: sawdust=1:5
Cement tile floor 0.6 Thickness of brick: 25mm, cement grit foundation included
Terrazzo floor 0.65 10mm surface layer and 20mm compo foundation
Oilcloth 0.02-0.03 Oilcloth, for floor surface Wood block floor 0.7 Antiseptic oil cream paving, 76mm thick
Magnesite flooring 0.28 Thickness 20mm
Cast iron floor 4-5 60mm broken-stone course and 60mm surface layer
Clinker floor 1.7-2.1 60mm sand bedding course and 53mm surface layer, carvel built
Clinker floor 3.3 60mm sand bedding course, 115mm surface layer, side built
Black tile floor surface 1.5 Sand block house, carvel built 16. Building Profiling Steel Plate (kN/m2)
Solitary wave-type V-300 (S-30) 0.13 Wave height: 173mm, plating thickness: 0.8mm Double-wave W-550 0.11 Wave height: 130mm, plating thickness: 0.8mm Tricrotism V-200 0.135 Wave height: 70mm, plating thickness: 1mm Multimode V-125 0.065 Wave height: 35mm, plating thickness: 0.6mm
Multimode V-115 0.079 Wave height: 35mm, plating thickness: 0.6mm 17. Architectural Panel (kN/m2)
Color steel plate metal curtain wall board 0.11 Two layers, the thickness of color steel plates: 0.6mm and the thickness of polyphenyl hexylene core material: 25mm 0.14 Plating thickness: 40mm, steel plate thickness: 0.6mm 0.15 Plating thickness: 60mm, steel plate thickness: 0.6mm Metal thermal insulating material
(polyurethane) composite plate
0.16 Plating thickness: 80mm, steel plate thickness: 0.6mm
Color steel plate with polyphenyl
hexylene heated board 0.12-0.15
Two layers, the thickness of color steel plates: 0.6mm and the thickness of polyphenyl hexylene core material:
50-250mm
0.24 Plating thickness: 100mm, tow layers of color steel plates, Z-type keel rock wool core material
Color steel plate rock wool sandwich board
0.25 Plating thickness: 120mm, tow layers of color steel plates, Z-type keel rock wool core material
GRC enforced cement polyphenyl
1.13
GRC interior wall board 0.35 Length: 2400-2800mm, width: 600mm, thickness: 60mm Lightweight GRC double partition board 0.17 3000mm× 600mm× 60mm
Lightweight GRC heated board 0.14 3000mm× 600mm× 60mm Lightweight large wall panel (outer space
board series) 0.7-0.9 6000mm×1500mm×120mm, high-strength cement foamed core
Lightweight large wall panel (outer space
board series), thickness: 80mm 0.4 Standard specifications: 3000mm * 1000 (1200, 1500)mm, high-strength cement foaming
Thickness: 100mm 0.45 Core materials, different steel skeletons and cold-drawn wire nets according to various distances and loads
Thickness: 120mm 0.5
GRC wallboard 0.11 Thickness: 10mm
Steel-net rock wool filler composite plate
(GY board) 1.1 Thickness of rock wool core material: 50mm, thickness of bifacial ferro-cement mortar: 25mm respectively
0.08 Plating thickness: 6mm 0.10 Plating thickness: 8mm Calcium silicate board
0.12 Plating thickness: 10mm
Cypress board 0.95
Plating thickness: 100mm, wire mesh with polyphenyl olefine insulating layer, the thickness of compo on each
surface: 20mm
Beehive composite plate 0.14 Thickness: 75mm
Gypsum perlite hollow slat 0.45 Length: 2500-3000mm, width: 600mm, thickness: 60mm Reinforced cement gypsum polyphenyl
heated board 0.17 3000mm×600mm×60mm
Glass curtain wall 1.0-1.5 20%- 30% greater than the deadweight of glass in unit area
Appendix B Method for Deciding the Floor Isoeffect Rectangular Distribution Live Load
B.0.1 The isoeffect rectangular distribution live load for floor (plate, junior beam and main beam) shall be decided according to the internal force (e.g.: bending moment, shearing force etc.), deformation and crack as required on the designed control position. In a typical case, it may be decided by the internal force.
B.0.2 The isoeffect rectangular distribution live load of continuous beam and plate may be calculated by single-span simple support. However when calculating the internal force, it shall be considered in a stream.
B.0.3 When there is great difference in the floor live load due to the difference of production, overhauling, mounting process and structural arrangement, the isoeffect rectangular distribution live load shall be decided on the basis of regions.
B.0.4 The isoeffect rectangular distribution live load (qe) of the partial load (including concentrated load) on the one-way slab can be calculated according to the following formula:
2
8 max
q bl M
e = (B.0.4-1)
Where,
l——is the lamellar span;
b——is the effective distribution width of the plate load, to be determined according to B.o.5 of this appendix;
Mmax——is the absolute maximum moment of the simple-support one-way slab, to be determined by the most disadvantaged arrangement of equipments.
When calculating Mmax, the equipment load shall be multiplied by the power coefficient and deducted the bending moment caused by applying load on the span area of this plate.
B.0.5 The effective distribution width (b) of the partial load on the one-way slab may be calculated according to the following provisions:
1 When the long edge of the working face of the partial load is in parallel with the plate span, the effective distribution width b of the load on the simply supported plate is: (Figure B.0.5-1)
Figure B.0.5-1 Effective Distribution Width of the Partial Load on the Simply Supported Plate (the long edge of the load's working face is in parallel with the plate span)
(1) When bcx≥bcy, bcy≤0.6l, bcx≤l:
b=bcy+0.7l (B.0.5-1)
(2) When bcx≥bcy,0.6l<bcy≤l, bcx≤l:
b=0.6bcy+0.94l (B.0.5-2)
2 When the long edge of the working face of the partial load is perpendicular to the plate span, the effective distri6ution width (b) of the load on the simply supported plate is: (Figure B.0.5-2)
Figure B.0.5-2 Effective Distribution Width of the Partial Load on the Simply Supported Plate (the long edge of the load's working face is perpendicular to the plate span)
(1) When bcx<bcy,bcy≤2.2l,bcx≤l:
b=3
2bcy+0.73l
Support
Non-supported edge
Support
bcy——is the calculated width when the load's working face is perpendicular to the plate span;
btx =btx+2s+h bty =bty+2s+h Where,
btx——is the width when the load's working face is in parallel with the plate span;
bty——is the width when the load's working face is perpendicular to the plate span;
s——is the underlayer thickness;
h——is the lamellar thickness.
3 When the partial load acts on the non-supported edge of the plate, namely: d<b/2 (Figure B.0.5-1), the effective distribution width of the load shall be deducted, and it can be calculated according to the following formula:
b′=1/2b+d (B.0.5-5)
Where,
b′——is the effective distribution width after deduction;
d——is the distance between the center of load's working face and the non-supported edge.
4 When the two partial load is adjacent but e<b, the effective distribution width of load shall be deducted and it can be calculated according to the following formula (Figure B.0.5-3):
Figure B.0.5-3 Effective Distribution Width of the Two Adjacent Partial Loads
b′=b/2+e/2 (B.0.5-6)
Where,
e——is the spacing between the center of two partial loads.
5 The effective distribution width of the partial load on the cantilever plate is (Figure B.0.5-4):
Support
Figure B.0.5-4 Effective Distribution Width of the Partial Load on the Plate for Cantilever
b=bcy+2x (B.0.5-7)
Where,
x——is the spacing from the center of partial load's working face to the support.
B.0.6 The equivalent uniform load of two-way slab may be determined according to the absolute maximum moment of the plate simply supported on four sides.
B.0.7 The partial load on the junior beam (including the longitudinal rib of the trough plate) shall be the bigger value of the bending moment's and shearing force's isoeffect rectangular distribution live load:
2 eM max
q 8
sl
= M (B.0.7—1)
sl
qeV = 2Vmax (B.0.7—2)
Where,
S——is the junior beam spacing;
l——is the junior beam span;
Mmax and Vmax——is the absolute maximum moment and maximum shear of the simple-support junior beam, to be determined by the most disadvantaged arrangement of equipments.
B.0.8 When the load is distributed uniformly, the isoeffect rectangular distribution live load on the main beam may be acquired through dividing the total load by the total load-bearing
B.0.8 When the load is distributed uniformly, the isoeffect rectangular distribution live load on the main beam may be acquired through dividing the total load by the total load-bearing