ASTM A1085 HSS HOLLOW SECTIONS

HSS/HOLLOW STRUCTURAL SECTION

STANDARD: ASTM A1085

SIZES:20X20--1200X1200 WT:1.3MM--60MM LENGTH:1M-24M As customer's requirement

A1085 extends the utility of HSS by accommodating a broader spectrum of applications. A1085 provides additional testing requirements, and improves the efficiency of the HSS members through tighter tolerances and adding property ranges in place of merely having a minimum or maximum value requirement. Locations where this material is used include, but are not limited to, "buildings, bridges, towers, cranes, sign supports and poles, off-shore production and drilling platforms, roll-over protective structures, falling object protective structures, and amusement rides" (ASTM 2015).

What kinds of projects is ASTM A1085 suited for?
Seismic applications
ASTM A1085 has a minimum design yield stress of 50 ksi. A1085 also has a maximum
yield stress requirement of 70 ksi. No other specifi cation has a maximum yield stress
limit. Having this limit on the maximum yield stress makes the expected strength of
the material more predictable. Ry, as defi ned in the AISC Seismic Provisions (AISC 341),
will be lower for A1085 than A500. This means connection designs in seismic zones can
be more cost-e ective when using the AISC seismic design provisions.
Bridge applications
Vehicle and pedestrian bridges are governed by AASHTO design requirements, which
refer to the ASTM A709 steel specifi cation that includes a Charpy V-notch requirement.
The A500 standard for HSS did not have a Charpy V-notch requirement, thus any bridge
designs that dictated the use of ASTM A500 needed to have additional Charpy V-notch
testing performed. All ASTM A1085 material now comes standard with a Charpy V-notch
requirement to meet the AASHTO criteria for fracture critical elements in Zone 2.
Power generation
The tighter dimensional tolerances of ASTM A1085 are ideal for projects that require
tighter design tolerances. This can include nuclear power plants, similar power generation
applications or any other project where more exact design criteria may be in place.