Plan Review: 89 Issues Found

Summary: The bottom beam flange detail calls out a slot width of 3/4" (0.750") with a bolt diameter of 7/8" (0.875"). A bolt cannot physically pass through a slot that is narrower than the bolt itself. IBC Section 2202.1 requires the design, fabrication, and erection of structural steel elements to be in accordance with AISC 360, and Section 2201.4 requires connections to be designed per applicable refe...

Why it matters: If this shop drawing is approved and fabricated as shown, the steel plates for the bottom beam flange connection will have slots too narrow to accept the specified 7/8" bolts. The plates would need to be re-fabricated with correctly sized slots, causing significant construction delays and materia...

Suggested next step: Request the steel fabricator and Engineer of Record confirm the correct slot width for the bottom beam flange. Per AISC 360 Table J3.3, the minimum slot width for 7/8" bolts should be 15/16". Verify whether the slot should be 15/16" wide (consistent with the short slot dimensi...

RFI draft: Request the steel fabricator and Engineer of Record confirm the correct slot width for the bottom beam flange. Per AISC 360 Table J3.3, the minimum slot width for 7/8" bolts should be 15/16". Verify whether the slot should be 15/16" wide (consiste...

Summary: The Bill of Material lists shear tab plate p282 as PL1/2"X7 5/16" with a length of 0'-10 3/8". Detail 1 shows this plate with four slotted holes at 3@2-5/8" spacing in the moment frame beam-to-column connection. A reviewer note on the drawing explicitly states the shear tab is wrong: it should be 19 3/4" tall to match the T-dimension of the moment frame beam, rather than being sized to the bolt...

Why it matters: If this column is fabricated with the shear tab at the as-drawn 10-3/8" height, the moment frame connection will be non-conforming and will fail special inspection per IBC Section 1705.2.1 (structural steel special inspections per AISC 360 quality assurance requirements). This would require rewor...

Suggested next step: Request the steel fabricator revise shear tab plate p282 to a height of 19 3/4" to match the T-dimension of the moment frame beam, as noted in the reviewer markup. Confirm with the Engineer of Record that the revised plate dimensions, slot layout, and slot spacing comply with ...

RFI draft: Request the steel fabricator revise shear tab plate p282 to a height of 19 3/4" to match the T-dimension of the moment frame beam, as noted in the reviewer markup. Confirm with the Engineer of Record that the revised plate dimensions, slot layout,...

Summary: The shop notes for Sequence-3 specify a default hole diameter of 13/16"Ø U.N.O. The bolt schedule calls for 40 qty 1-1/4"Ø A490SC_TC site bolts (10 per plate across 4 plates). The plate detail shows 5 explicitly sized slots (1-5/8" x 1-3/8") on the upper bolt line and 6 hole centers on the lower bolt line, of which only 1 is explicitly sized at 1-9/16"Ø. The remaining 5 lower bolt-line holes ha...

Why it matters: If fabricated as detailed with 13/16"Ø default holes on the lower bolt line, the 1-1/4"Ø A490 slip-critical bolts cannot be installed during steel erection, halting construction at this connection. The plates would require return to the fabrication shop for reaming or replacement, causing signifi...

Suggested next step: Request the engineer of record clarify the required hole diameters for the uncalled-out holes on the lower bolt line of plate S2227. Confirm whether these holes should be standard holes (1-5/16"Ø), oversize holes (1-9/16"Ø), or short-slotted holes per AISC 360 Table J3.3 for t...

RFI draft: Request the engineer of record clarify the required hole diameters for the uncalled-out holes on the lower bolt line of plate S2227. Confirm whether these holes should be standard holes (1-5/16"Ø), oversize holes (1-9/16"Ø), or short-slotted holes...

Summary: Sheet E11 (Level 3 Floor Framing Plan @ South Area) shows member S2226 as a W16X26 in the area near grids SC/SD/SF. Sheet E17 (Partial Level-3 Floor Framing Plan @Stair), which is an enlarged view of an overlapping portion of the same Level 3 framing, consistently shows the same piece mark S2226 as a W12X40 near grids SBB/SC. Since piece marks are unique identifiers in structural steel fabricat...

Why it matters: A W16X26 (16-inch deep, 26 lb/ft) and a W12X40 (12-inch deep, 40 lb/ft) have substantially different section properties, flange widths, web thicknesses, and beam depths. Fabricating to the wrong size would result in either an under-designed or over-designed member and would cause fit-up problems ...

Suggested next step: Request clarification on the correct size for member S2226. Confirm whether it should be W16X26 (as shown on sheet E11) or W12X40 (as shown on sheet E17), and issue revised drawings to make both sheets consistent.

RFI draft: Request clarification on the correct size for member S2226. Confirm whether it should be W16X26 (as shown on sheet E11) or W12X40 (as shown on sheet E17), and issue revised drawings to make both sheets consistent.

Summary: The DuraFuse connection schedule (Detail 9/SF2-22) specifies T2 = 1 1/8" for connection DF103 (W30X292 column / W33X141 beam). The cap plate detail (Detail 7/SF2-22) explicitly states CAP PLATE THICKNESS = T2. However, shop drawing E103 shows the continuity cap plate at PL 1 3/4" in Detail 5 (section 5B) and PL 1 1/2" in Detail 6 — both referencing DF103/SF2-22 & SF2-23. Neither value matches t...

Why it matters: The cap plate thickness is a design-critical parameter in the DuraFuse Frames proprietary moment connection system. An incorrect thickness alters the load path, stiffness distribution, and fuse mechanism behavior under seismic loading. Fabrication with the wrong plate thickness could compromise t...

Suggested next step: Request clarification from the Engineer of Record and DuraFuse Frames on the correct continuity cap plate thickness for DF103 connections. Confirm whether the cap plate thickness should be T2 = 1 1/8" per the connection schedule on SF2-22, and resolve the discrepancy between D...

RFI draft: Request clarification from the Engineer of Record and DuraFuse Frames on the correct continuity cap plate thickness for DF103 connections. Confirm whether the cap plate thickness should be T2 = 1 1/8" per the connection schedule on SF2-22, and res...

Summary: The DF108 connection detail explicitly labels the edge distance as "E 1 1/4" (1-1/4 inches). However, the project's general plate and bolt information specifies that the edge distance (E) shall be 1-3/4 inches. This is a direct 1/2-inch shortfall in edge distance from the specified value.

Why it matters: A reduced bolt edge distance directly affects bolt bearing and tearout capacity at the connection plates. For a seismic moment frame connection (DuraFuse Frames), this undercut could reduce the connection's capacity below the design requirements, potentially compromising the seismic performance o...

Suggested next step: Request clarification from DuraFuse Frames engineering on whether the edge distance for DF108 should be 1-3/4 inches per the general specification or 1-1/4 inches as shown on the shop drawing aid detail. If 1-3/4 inches governs, the DF108 detail plate layouts and overall plate...

RFI draft: Request clarification from DuraFuse Frames engineering on whether the edge distance for DF108 should be 1-3/4 inches per the general specification or 1-1/4 inches as shown on the shop drawing aid detail. If 1-3/4 inches governs, the DF108 detail p...

Summary: The DF105 Summary Information drawing shows an edge distance of E 1 1/4" at multiple plate locations (cap plate, fuse plate, and top beam flange plate). However, the Shop Drawing Aid Sheets specify the standard edge distance for DuraFuse connections as 1 3/4". A 1 1/4" edge distance is 1/2" less than the specified value, which directly contradicts the project specification.

Why it matters: Edge distance is a critical parameter for bolted connections, directly affecting bolt bearing and tearout capacity. An insufficient edge distance of 1 1/4" versus the specified 1 3/4" could result in a reduction of bolt bearing/tearout strength, potentially leading to a connection capacity below ...

Suggested next step: Request clarification from DuraFuse Frames, LLC and the Engineer of Record on the edge distance discrepancy. The DF105 Summary Information shows E = 1 1/4" at multiple plate locations, while the Shop Drawing Aid Sheets specify an edge distance of 1 3/4". Confirm which edge dis...

RFI draft: Request clarification from DuraFuse Frames, LLC and the Engineer of Record on the edge distance discrepancy. The DF105 Summary Information shows E = 1 1/4" at multiple plate locations, while the Shop Drawing Aid Sheets specify an edge distance of ...

Summary: The DF105 connection detail shows an edge distance callout of "E 1 1/4" (appearing at multiple locations on the fuse plate and flange plate layouts). However, the Shop Drawing Aid Sheet (SHOP-1) specifies the edge distance as 1-3/4 inches. This is a 1/2-inch shortfall in edge distance from the project requirement.

Why it matters: A reduced edge distance of 1-1/4" instead of the required 1-3/4" directly affects the bolt bearing and tear-out capacity of the connection plates. In a seismic moment frame connection (DuraFuse system), this deficiency could compromise the connection's ability to develop the required bolt strengt...

Suggested next step: Request clarification from DuraFuse Frames, LLC and the Engineer of Record on the correct edge distance for the DF105 connection. The shop drawing aid sheet specifies E = 1-3/4", but the DF105 detail shows E = 1-1/4". Confirm which value governs and whether the connection plat...

RFI draft: Request clarification from DuraFuse Frames, LLC and the Engineer of Record on the correct edge distance for the DF105 connection. The shop drawing aid sheet specifies E = 1-3/4", but the DF105 detail shows E = 1-1/4". Confirm which value governs a...

Summary: The drawing shop notes state that all plates are A36 steel unless noted otherwise. The individual plate callouts throughout the details (cover plates, continuity plates, top plates, fuse plates, shear tabs) do not specify a steel grade, so the A36 default would govern. However, the DuraFuse Frames specification explicitly requires all connection steel plates to be ASTM A572 Grade 50. The Shop D...

Why it matters: Using A36 plates instead of A572 Grade 50 in seismic moment frame connections would result in substantially weaker connections that may not develop the required moment capacity. The DuraFuse Frames system is specifically designed and tested with A572-50 plates; substituting A36 could compromise t...

Suggested next step: Request that the fabricator revise Shop Note 4 on sheet E104 to exclude connection plates from the A36 default, and add a note specifying that all DuraFuse Frames connection plates (cover plates, continuity plates, top plates, fuse plates, and shear tabs) shall be ASTM A572 Gr...

RFI draft: Request that the fabricator revise Shop Note 4 on sheet E104 to exclude connection plates from the A36 default, and add a note specifying that all DuraFuse Frames connection plates (cover plates, continuity plates, top plates, fuse plates, and she...

Summary: The DF107 cap plate detail and fuse plate detail both show the edge distance labeled as "E 1 1/4" (1-1/4 inches). However, the project specification for general plate and bolt information explicitly states the edge distance shall be 1-3/4 inches. This is a 1/2-inch shortfall from the required edge distance, which directly contradicts the specification.

Why it matters: Insufficient bolt edge distance is a critical structural concern. Reduced edge distance can lead to bolt tear-out or bearing failure at the plate edges, particularly under the high seismic demands of a DuraFuse moment frame connection. This affects the integrity of the protected zone fuse plate a...

Suggested next step: Request clarification from DuraFuse Frames on whether the edge distance for the DF107 cap plate and fuse plate should be 1-3/4 inches as specified in the general plate and bolt information, or if the 1-1/4 inch dimension shown on the DF107 detail sheets is an intentional conne...

RFI draft: Request clarification from DuraFuse Frames on whether the edge distance for the DF107 cap plate and fuse plate should be 1-3/4 inches as specified in the general plate and bolt information, or if the 1-1/4 inch dimension shown on the DF107 detail ...

Summary: Drawing E19 Shop Note #4 specifies 'ALL ANGLES, CHANNELS AND PLATES ARE A36 U.N.O.' as the default plate material. However, the DuraFuse General Notes specification requires all connection steel plates to be fabricated from ASTM A572 Grade 50 steel. The drawing shows multiple connection plates (e.g., PL 1/2"X12, PL 3/8"X3 7/16) at DuraFuse frame connections that would default to A36 under the d...

Why it matters: A36 steel has a yield strength of 36 ksi compared to 50 ksi for A572 Grade 50. Using A36 plates in DuraFuse moment frame connections where A572-50 is required would result in under-strength connections that may not develop the required capacity for seismic performance. This could compromise the i...

Suggested next step: Request clarification from the Engineer of Record and DuraFuse Frames, LLC regarding the plate material specification. Shop Note #4 on the detail drawing specifies A36 for plates, while the DuraFuse General Notes and Shop Drawing Aid require A572 Grade 50 for all connection pl...

RFI draft: Request clarification from the Engineer of Record and DuraFuse Frames, LLC regarding the plate material specification. Shop Note #4 on the detail drawing specifies A36 for plates, while the DuraFuse General Notes and Shop Drawing Aid require A572 ...

Summary: The DF107 connection detail on drawing SHOP-11 shows the edge distance labeled as "E 1 1/4" on the fuse plate detail. The project specification on SHOP-1 explicitly defines the edge distance as "EDGE DIST. (E, IN) 1 3/4". This is a direct contradiction: the drawing shows 1 1/4" where the specification requires 1 3/4", a difference of 1/2".

Why it matters: Edge distance is a critical parameter for bolted connections, directly affecting bolt bearing capacity and tear-out strength of the plate. A 1/2" reduction in edge distance (from 1 3/4" to 1 1/4") significantly reduces the available bearing/tear-out capacity at the bolt locations, potentially com...

Suggested next step: Request clarification from DuraFuse Frames and the Engineer of Record on whether the edge distance for the DF107 fuse plate connection should be 1 1/4" as shown on the detail or 1 3/4" as specified in the general plate and bolt information on SHOP-1. Request a revised shop dra...

RFI draft: Request clarification from DuraFuse Frames and the Engineer of Record on whether the edge distance for the DF107 fuse plate connection should be 1 1/4" as shown on the detail or 1 3/4" as specified in the general plate and bolt information on SHOP...

Summary: The DF106 connection detail on SHOP-9 shows edge distance 'E 1 1/4' at multiple locations (short-slot plate detail, fuse plate detail, and flange-plate detail). However, the Shop Drawing Aid sheet SHOP-1 specifies 'EDGE DIST. (E, IN) 1 3/4'. The drawing's 1 1/4" edge distance is 1/2" less than the specified 1 3/4", which is a direct contradiction of the project specification.

Why it matters: A reduced edge distance from 1 3/4" to 1 1/4" directly reduces bolt bearing and tear-out capacity at the plate edges. In a DuraFuse moment frame connection that is part of the seismic lateral force-resisting system, this under-dimensioned edge distance could compromise the connection's ability to...

Suggested next step: Request clarification from DuraFuse Frames engineering on the correct edge distance for DF106 connection plates. The Shop Drawing Aid specifies E = 1 3/4" but the DF106 detail shows E = 1 1/4" at multiple plate locations. Confirm which value governs and whether the connection ...

RFI draft: Request clarification from DuraFuse Frames engineering on the correct edge distance for DF106 connection plates. The Shop Drawing Aid specifies E = 1 3/4" but the DF106 detail shows E = 1 1/4" at multiple plate locations. Confirm which value gover...

Summary: The drawing shop notes state that all plates are A36 steel (U.N.O.), while the DuraFuse Frames specification explicitly requires all connection steel plates—including cover plates, external continuity plates, internal continuity plates, shear tabs, top plates, and fuse plates—to be fabricated from ASTM A572 Grade 50 steel. No individual plate callouts on the drawing override this default with a...

Why it matters: A36 steel has a yield strength of 36 ksi versus 50 ksi for A572 Grade 50, representing a roughly 28% reduction in plate yield capacity. For DuraFuse Frame moment connections, which are engineered seismic systems relying on specific plate strengths (especially the fuse plate mechanism), using A36 ...

Suggested next step: Request clarification from the fabricator and Engineer of Record on the plate material grade for all DuraFuse Frame connection plates (cover plates, continuity plates, shear tabs, top plates, and fuse plates). The drawing shop note specifying A36 for plates must be revised to ...

RFI draft: Request clarification from the fabricator and Engineer of Record on the plate material grade for all DuraFuse Frame connection plates (cover plates, continuity plates, shear tabs, top plates, and fuse plates). The drawing shop note specifying A36 ...

Summary: The DF106 Summary Information drawing shows edge distances of "E 1 1/4" (at the cap plate and fuse plate details) and "E 1" (at the bottom beam flange bolt group). However, the project Shop Drawing Aid (SHOP-1) general plate and bolt information specifies the edge distance as 1-3/4 inches. Both drawn values are less than the specified 1-3/4", representing a direct contradiction of the project s...

Why it matters: Edge distance is a critical bolt connection parameter affecting bolt bearing and tearout capacity. Reducing the edge distance from the specified 1-3/4" to 1-1/4" (or 1") significantly reduces the available bearing/tearout strength and could lead to a connection capacity below the required design ...

Suggested next step: Request clarification from DuraFuse Frames, LLC and the Engineer of Record on the correct edge distance for the DF106 connection. The general specification states E = 1-3/4", but the DF106 detail shows E = 1-1/4" and E = 1". Please confirm the governing edge distance values an...

RFI draft: Request clarification from DuraFuse Frames, LLC and the Engineer of Record on the correct edge distance for the DF106 connection. The general specification states E = 1-3/4", but the DF106 detail shows E = 1-1/4" and E = 1". Please confirm the gov...