Sổ tay kết cấu thép - Section 12

... assume a 9-in-thick slab, weight 112 lb/ft2plus 5 lb/ft2for theadditional thickness of deck concrete in the stay-in-place forms. The 9-in-thick slab consists 12. 6SECTION TWELVEof a 73⁄4-in base ... determined with the section moduli of the composite sectionwith nϭ24 for SDL from Table 12. 2a and nϭ8 for LLϩI from Table 12. 2b (Table12.3b). 12. 1 2SECTION TWELVETABLE 12. 2Composite Section for Maximum ... plates (Fig. 12. 20).Stiffeners. See Arts. 12. 9.4 to 12. 9.6.Bearings. See Arts. 12. 9.8 and 12. 9.9.Shear Connectors. See Art. 12. 2.Deflections. See Art. 12. 2.Load-Factor Design. See Art. 12. 5 .12. 5 EXAMPLE—LOAD-FACTOR...

... grades of uncoated, hot-rolled, carbon-steel sheetsand strip intended for structural use.A606 covers high-strength, low-alloy, hot- and cold-rolled steel sheet and strip with en-hanced corrosion resistance. ... referred to as pressure-vessel-quality steels. Generally, a greater numberof mechanical-property tests and additional processing are required for pressure-vessel-quality steel.1. 8SECTION ONETABLE ... %*A570 Hot-rolled30 30 49 2133 33 52 1836 36 53 1740 40 55 1545 45 60 1350 50 65 1155 55 70 9A606 Hot-rolled, cut length 50 70 22Hot-rolled, coils 45 65 22Cold-rolled 45 65 22A607 Hot- or cold-rolled45...

... designed as bearing-type, fully-tightened, loose-to-slip or slip-critical connections (see Art. 5.3). Bearing-type connections have a higher allowable load ordesign strength. Slip-critical connections ... shipping.2.10 BUILT-UP SECTIONSThese are members made up by a fabricator from two or more standard sections. Examplesof common built-up sections are shown in Fig. 2.2. Built-up members are specified ... together for fit-upand final welding. The web-to-flange welds, usually fillet welds, are positioned for weldingwith maximum efficiency. For relatively small welds, such as1⁄4-or5⁄16-in fillets, a girdermay...

... axisϬbh31. 0121 121.0 cos␣b 1sin␣ϩ2h 2cos2␣21 b 1sin␣ϩͩ 12 h 121 ϪbЈ2t1Ϫ1Ϫͩͪͩͪbh1231 bЈ2t1Ϫ1Ϫ1Ϫͫͩ ͪͩ ͪ 12 bhϭ0.785398␲ 412 0.049087␲642␲h11Ϫͩͪ24 h124␲h11Ϫͩͪ464 h23358175233581751Ϫh1h1231 h11Ϫͩͪ 312 hGENERAL ... of Sections (Continued )AϭAreabh cϭdepth to centroidϬhIϭmoment of inertia about centroidalaxisϬbh31Ϫbh11ͩͪbh1231 bh111Ϫͫͩͪ 12 bh1ϪbЈh11Ϫͩͪͩͪbh1231 bЈh11Ϫ1Ϫͫͩ ͪͩͪ 12 bh1Ϫbt11Ϫͩͪbh2bt11Ϫ1Ϫͩͪ2bh12bt11Ϫ1Ϫͩͪbh22t1Ϫa ... point in the section throughwhich the bending axis passes.For sections having two axes of symme-try, the shear center is also the centroid ofthe section. If a section has an axis of sym-metry, the...

... L/N123456789 C121 1 48 3128 778486 4123 91171116117119768 5123 4324540234572684040687245234045323750 6123 45253839311738646956313969816939315669643817313938253888 7123 4567211 5128 11788471152002322161648 8128 23228827921611711721627928823 2128 88164216232200115478811 7128 1157214,406 8123 45674981959481593181144175176153 1125 995175225234207153819417623425623427694811532072342251759559 1121 53176175144813159819495814 912, 288 9123 4567 8128 217264275256213152792173924925204884082921522644926487056725674082132755207058007846724882562564886727848007055202752134085676727056484922641522924084885204923922177915221325627526421 7128 39,36610 ... 48 3128 778486 4123 91171116117119768 5123 4324540234572684040687245234045323750 6123 45253839311738646956313969816939315669643817313938253888 7123 4567211 5128 11788471152002322161648 8128 23228827921611711721627928823 2128 88164216232200115478811 7128 1157214,406 8123 45674981959481593181144175176153 1125 995175225234207153819417623425623427694811532072342251759559 1121 53176175144813159819495814 912, 288 9123 4567 8128 217264275256213152792173924925204884082921522644926487056725674082132755207058007846724882562564886727848007055202752134085676727056484922641522924084885204923922177915221325627526421 7128 39,36610 ... any section due to loads on the archyϭvertical ordinate of section measured from immovable hinge4. 4SECTION FOURIϭmoment of inertia of arch cross sectionAϭcross-sectional area of arch at the sectionEϭmodulus...

... E7016-X,E7018-XAWS A5.17 or A5.23§F7XX-EXXXF7XX-EXX-XXAWS A5.18ER70S-XAWS A5.20or A5.29§E7XT-X(ExceptϪ2,Ϫ3,Ϫ10,Ϫ13,Ϫ14,ϪGS)E7XTX-XA572 grades 60 and 65 AWS A5.5§E8016-X, E8015-XE8018-XAWS A5.23§F8XX-EXX-XXAWS ... 18-C1,C2§E8016, 18-C3§E8018-W§AWS A5.17 orA5.23F7A0-EXXX,F8A0-EXXX§AWS A5.20or A5.29E7XT-1,5E8XT-1,5-NiX, WA852 / M270M grade485W‡AWS A5.5E9018-MAWS A5.23F9A0-EXXX-XAWS A5.29E9XT1-XE9XT5-XA514 / M270 ... E7016-X, or E7018-XAWS A5.17F7A0-EXXXAWS A5.20E7XT-1,5A588 / M270M grade345W‡ 4-in andunderAWS A5.1E7016, E7018,E7028AWS A5.5E7016-X, E7018-X, E7028-X,E7018-WE7015, 16, 18-C1L, C2LE8016, 18-C1,C2§E8016,...

... finishesAsphalt block (2-in),1⁄2-in mortar 30Cement finish (1-in) on stone-concrete 32fillCeramic or quarry tile (3⁄4-in) on1⁄2-in 16mortar bedCeramic or quarry tile (3⁄4-in) on 1-in 23mortar bedFrame ... 600Flat or rise less than 4:12Arch or dome with rise lessthan1⁄8of span20 16 12Rise 4 :12 to less than 12: 12 16 14 12Arch or dome with rise1⁄8span to less than3⁄8spanRise 12: 12 or greaterArch or dome ... 19Terrazzo (1-in) on stone-concrete fill 32Terrazzo (1-in), 2-in stone concrete 32Wood block (3-in) on mastic, no fill 10Wood block (3-in) on1⁄2-in mortar base 16Floors, wood-joist (no plaster) double...

... at the beam-column connection areDead-load major-axis momentϭ180 kip-ftLive-load major-axis momentϭ75 kip-ftDead-load minor-axis momentϭ75 kip-ftLive-load minor-axis momentϭ40 kip-ftThe column ... inMϭ242.3 12. 567ϩ0.5(276.5Ϫ242.3)n276.5Ϫ242.3ϫ(15.69Ϫ0.345ͩͪ2ϫ1.898ϫ36ϭ3, 312 kip-in␾Mϭ0.85ϫ3 312/ 12ϭ234.6 kip-ftn3. PNA⌬AƒϭAƒ/2ϭ0.949 in below the top of the top flange:͚Qϭ208.2 kipsn␾Mϭ224.0 kip-ftn4. ... 2(184.6)ϭ1,591 kip-inϭ132.6 kip-ftϽ277.5 kip-ftThe W21ϫ50 does not have adequate capacity. Therefore, trials to find the lowest-weightlarger size must be continued. This trial-and-error process can...

... rigidity. Care should be8.3 4SECTION EIGHTFIGURE 8.32 Cable roofs. (a) Cable-stayed cantilever roof; (b) single-layer cable-suspended roof;(c) double-layer cable-suspended roof.FLOOR AND ROOF ... Two-hour fire-rated floor systems, with cold-formed steel deck. (a) With lightweightconcrete fill; (b) with normal-weight concrete fill.the metal deck without spray-on fire protection and 21⁄2-in ... expensive normal-weight concrete may beused instead of lightweight concrete. Therefore, the two options that are frequently consid-ered for a 2-hour-rated, noncellular floor-deck system are 31⁄4-in lightweight...

... slope less than 2 :12 0.9 outward or 0.3 inward with roof slope between 2 :12 and 9 :12 0.4 inward with roof slope between 9 :12 and 12: 12ϭ0.7 inward with roof slope greater than 12: 12.Method 2 (Fig. ... static-force method is a single-mode design method, even though long-period structures are influenced by higher-moderesponse, and Ftsimulates the effect of higher-mode response on the earthquake-load ... of the mass matrix. The multidegree-of-freedom equations are coupled.They can be solved simultaneously by a number of methods. However, the single-degree-of-freedom response spectrum method is...