ASME BTH-1:2017 pdf free download

ASME BTH-1:2017 pdf free download.Design of Below-the-Hook Lifting Devices.
3-1.5 Curved Members
The design of curved members that are subjected to bending in the plane of the curve shall account for the increase in maximum bending stress due to the curvature, as applicable.
The stress increase due to member curvature need not be considered fr llexural members that can develop the full plastic moment when evaluating st1tic strength. This stress increase shall be considered when evaluating fatigue.
3.1.6 Allowable Stresses
All strutural members, ..sinedions. and connectors shall be proportioned so the stresses due to the loads stipulated in para. 3-1.2 do not exceed the allowable stresses and stress ranges specified in sections 3-2, 3-3, and 3-4. The allowable stresses specified in these sections do not apply to peak stresses in regions of connections, provided the requirements of section 3-4 arc satisfied.
3-1.7 Member Properties
The section properties of hollow structural sections (1-ISS) and pipe shall be based on the design wall thick. ness equal to (1.93 times the nominal wall thickness for electrIc-resistance-welded (ERW) shapes and equal to the nominal wall thickness for submerged-arc-welded (SAW) shapes. When the manufacturing method is not known or cannot be reliably determined, the smaller value shall be used.
3-2 MEMBER DESIGN
3-2.1 Tensor, Members
The allowable tensile stress, F,, shall not exceed the value given by eq. (3-1) on the gross area nor the value given by eq. (3-2) on the effective net tensile area.
The effective throat thickness is the minimum distancefrom the root of the groove to the face of the weld, lessany reinforcement (usually the depth of the groove). Fora complete-penetration groove weld, the effective throatthickness is the thickness of the thinner part joined.In partial-penetration groove welds, the effective throatthickness for J- or U-grooves and for bevel or v-grooveswith a minimum angle of 60 deg is the depth of thegroove.For v-groowes from 45 deg to 60deg, the effectivethroat thickness is the depth of the groove minus k in.(3 mm).
The minimum partial-penetration groove weldeffective throat thickness is given in Table 3-3.4.2-1.Theminimum throat thickness is determined by the thickerpart joined.However, in no case shall the effective throatthickness be less than the size required to transmit thecalculated forces.
For bevel and v-groove flare welds,the effective throatthickness is based on the radius of the bar or bend towhich it is attached and the flare weld type.For bevelwelds,the effective throat thickness is 6timesthe radius of the bar or bend. For v-groove welds, theeffective throat thickness is 1%times the radius of thebar or bend.
3-3.4.3 Fillet Welds.Fillet weld size is specified byleg width, but stress is determined by effective throatthickness. The effective throat of a fillet weld shall bethe shortest distance from the root to the face of the weld.In general,this effective throat thickness is considered tobe on a 45-deg angle from the leg and have a dimensionequal to 0.707 times the leg width. The effective weldarea of a fillet weld is defined as the effective length ofweld multiplied by the effective throat thickness.