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Hello, This question is about the standard bolt hole sizes. In usual scenarios, we say that bolt hole size shall be dia. of bolt + 1/16". But in the submittal I have, the contractor is using bolt hole sizes as dia. of bolt + 1/16" + 1/16". Does someone know if we can add 1/16" twice and where...

Hello, Can anyone please guide me on how to design the plate for the uniform moment shown in the attached sketch? I am following AISC for the design. It seems very simple design but I am getting a bit confused and wanted to be sure. Thank You for the help...

Hello Everyone, Please see the attached image. I have a project in NYC for which I have varying weird slopes on the roof. I need to design snow load for this roof and I wanted to know if my approach is right or not or if there is anything someone would consider which I might have missed. When...

Hello, I haven't done a lot of concrete design and have a very basic question. I have a new concrete beam that is framing into the existing beam and we used #5 bar with HILTI HY200 embedment depth 6" into the existing beam to develop that connection. Now something happened in the field and the...

Hello, I am working on a project in NYC that has 3 different elevation roofs. All roofs are connected together. One roof is 66ft high and another 2 are 32ft and 26ft. When I calculate C&C wind uplift pressure, do I calculate C&C forces separately for lower roofs or is it going to be same value...

Hello, I have a project in NYC for which I have a lot of long-span joists. I have a bunch of rooftop equipments on dunnage, posts of which rest on these joists. I have a few questions related to connections of these posts to the joists and if anyone can refer me in the right direction, it would...

Hello Everyone, I have a project in NYC where I have a huge roof in which we have a lot of long-span joists. We are preparing a load table for vulcraft and I have 2 questions about the loads. 1. Vulcraft asks for Live load end continuity Moments/Wind and Seismic end moments. We are already...

Hello, I have modeled a structure that has a lot of plates in STAAD Pro. STAAD shows Von Mises stress for plates and a general question came to my mind. How do we compare yield stress and von mises, I mean I think there would be a phi factor to show the relation between them but I am not able...

Hello All, Does anyone have any information/chard related to chord dimensions for long-span joists? We have a bunch of joists in a structure in New York and the joist we have in 3-D model shows top chord widths as 5" max. Our joists are over 40' in length and I think top chord angles size bumps...

Hello All, I need to design an in-plane moment connection plate between wide flange beams to HSS tube columns. Please see the attached sketch. I went through chapter K of the AISC steel manual amd also design guide 24 but I can't seem to find any good examples for this situation. I could have...

Hello Everyone, I have a question related to camber for the long span joists. I have a huge roof which has like 60-70 long-span joists and they support a bunch of roof equipments. I know that we calculate camber by considering dead load/superimposed dead load deflection and specifying that...

Hello, I am working on a project which has 3 different elevation flat roofs. All roofs are connected to each other. I got uplift and downward wind pressures for the individual roofs. My question is this - While considering roof joist members for component and cladding wind loads, shall I...

Hello, I am working on the design of a roof beam system which has a lot of beams @ around 6 ft spacing and span length is 30 ft. While computing beam uplift, I have to consider the effective area for members. Traditionally effective area is span length multiplied by trib width which in this...

Hello, I am working on a project in NYC which has a lot of roof long-span joists. As per vulcraft, we need to provide them a load table for each special/simple joist. I am creating that load table for vulcarft and I am stuck at one point. They mention in the table to specify axial loads for...

Hello, I have to design a 4ft long unistrut bracket for very small loading (50 lbs). I have previously never worked with unistruts so please excuse this stupid question. I see that unistrut website has predefined brackets but none are as long as 4ft. So I have to use 2 unistruts - One...

Hello, I have a task in a project in Philadelphia, USA in which I have to create a loading diagram for vulcraft. Loading diagram is for numerous joist at roof. I have really very little information about long span joists and am trying to go through the guide vulcraft has provided and wants to...

Hello, I have a situation in which I have a column channel which is welded (all around) to a base plate. The base plate is bolted to the concrete slab by 4 bolts. For these type of situations, I used to consider the base as pinned and design base plate for shear/axial loads only. I know that's...

Hello, I have a basic structural engineering question and would be really great if someone can help me understand this. So I have a rooftop platform with stairs. I have 2 posts below 2 stair stringers and the posts are sitting on 2 channels. My understanding was that I would have to brace the 2...

Hello, I have a rooftop mechanical equipment for which I have to design dunnage steel. Dunnage steel is going to be supported by HSS posts on long span joists. The equipment is of 2 levels so I have to also design an elevated platform supported on top of the dunnage steel so that the doors of...

Hello, I am getting a weak spring message in this code. I am not able to understand why this is happening. My assumption is that it's because of pinned end supports there is some moment in the frame which is not able to get resolved. If my assumption is right then can someone please help me...