In this blog, I’d like to share an issue we faced while detailing Platform Screen Door (PSD) support beams in a metro station project.
Our scope was to provide structural beams to support the platform screen doors. The design also required stiffeners in these beams for structural strength.
The Issue We Identified
Before placing the stiffeners as per the design, we reviewed how the door frames would connect to the beams. During this check, we realized that the stiffeners could clash with the door frame supports.
As expected, when we reviewed the door frame support details, the clash became clear.
We raised this issue with the relevant team, and they advised us to modify the stiffener size so it would not interfere with the door frame supports.
As detailers, we shouldn’t just place elements exactly as shown in the design. We must also think about how other components will connect and function.
This is especially important when our steel supports secondary steel, equipment, or framing systems. A little extra attention during detailing can prevent major issues during installation.
Detailers must exercise caution when working with bolts and edge distances, as these are common areas for errors in structural detailing. In this blog, I’ll share my experience with a bolt edge distance issue and how it was resolved.
The Scenario
In a recent project, the design required a UB (Universal Beam) to sit on a 200mm-thick concrete wall, secured with M20 chemset bolts.
Upon review, it became clear this setup wasn’t feasible:
Anchor Distance: M20 bolts require a minimum anchor distance of 120mm.
Edge Distance: A minimum edge distance of 80mm is necessary.
Additionally, the beam wasn’t centered on the wall, further complicating the bolt placement.
The Proposed Solution
To address the issue, I proposed welding plates to the bottom of the beam. This adjustment allowed the beam to be bolted to the side of the wall rather than its top.
The Engineer’s Feedback
After reviewing the proposal, the engineer suggested a simpler solution: using a single row of bolts instead of two. This change eliminated the edge distance problem.Engineer mentioned that one row of bolt is enough for this beam.
In this project, the engineer did not accept our proposal, as they determined that the beam does not require that level of support. However, as detailers, it is our responsibility to highlight the issue and propose suitable solutions.
The Stage 3 Works at Muswellbrook TAFE, located on Maitland Street, NSW, represent a significant milestone in the campus’s ongoing development and modernization.
The new development comprises a storage warehouse, a curved amenities area, and multiple classrooms housed within a large integrated structure. The project involved a complex structural steel framework designed to support diverse functional spaces under one roof.
A key challenge during this stage was coordination with the mechanical services contractor, as several ducts and ventilation systems initially clashed with the structural steel members. Through collaborative design reviews, practical solutions were agreed upon—relocating steel members at certain locations and adjusting duct routes at others—to achieve optimal constructability without compromising structural integrity or service performance.
When detailing steel, one important factor that’s often overlooked is the stock length of the beams. Confirming this early can prevent major rework later in the project.
Recently, we worked on a façade support steel project that involved several CHS beams. Normally, CHS sections are available up to 12 meters in length. However, in this case, the client informed us that for smaller CHS sizes, the maximum available length was only 6.5 meters.
Please see the below email from the client.
“Hi Ganesh
Have just noticed some of your Member lengths for the 101 CHS are longer than 6.5m stock lengths.”
Then we have raised RFIs for the stock lengths. See the below replies from the client.
Always confirm the available stock lengths with the client or fabricator before starting the detailing. Early coordination like this saves time, reduces rework, and ensures a smoother fabrication process.
In this blog, I’d like to share an issue we faced related to hanger locations.
In this job, the floor steel was supported from the slab soffit. Initially, we placed the hangers as per the design drawings. However, during coordination with the concrete model, we discovered a slab void exactly at one of the hanger locations — meaning there was no concrete support available for that hanger.
Fortunately, we identified the issue before fabrication and raised it with the respective manager for correction.
When detailing steel, especially hangers or supports connected to concrete, it’s crucial to check the concrete model. Focusing only on the steel scope can lead to such clashes. Always verify slab and concrete details at the steel connection points to avoid costly rework later.
Our detailing team worked closely with architects to ensure tolerances and offsets were met without compromising design intent With a limited fabrication and erection window, our detailing team adopted a fast-track workflow using Tekla Structures for 3D modeling.
We are proud to be a part of the team in IRON_ARENA_SPORTS_CENTER project.
This allowed us to provide early shop drawings for procurement and parallel review of sections still under coordination.