1. Structural Function

The main purpose of this structure is to convert a relatively small ground footprint into a five-level spectator viewing area.

A flat seating area only arranges people horizontally.

A grandstand adds another dimension:

front row
→ second row
→ third row
→ fourth row
→ fifth row

with each row positioned progressively higher than the row in front.

The structural system must therefore perform several functions at the same time:

support the stepped geometry + create seating surfaces + provide foot space and circulation + protect elevated edges.

This is why the complete structure should be considered a grandstand system rather than simply a group of aluminum benches.

2. Overall Configuration

The drawing shows that the five rows are not independent benches placed on the ground.

They are integrated into one stepped supporting structure.

That distinction is fundamental.

3. Main Structural Modules

The grandstand can be divided into four main modules.

Module 1 — Hot-Dip Galvanized Steel Supporting Frame

The galvanized steel frame forms the main structural skeleton underneath the grandstand.

Instead of using a flat rectangular frame, the side geometry rises progressively toward the rear.

This stepped steel arrangement establishes the elevation required for all five rows.

In practical terms:

Steel Frame Geometry
→ Row Elevation
→ Aluminum Seating and Footboard Position

The frame therefore determines the basic shape of the entire grandstand.

The supplied material identifies the support as a hot galvanized angle steel frame.

The page does not provide steel section dimensions, wall thicknesses, weld specifications or verified load calculations, so those values should not be assumed.

4. Five-Row Stepped Geometry

The five seating rows create the characteristic bleacher profile.

Viewed from the side, each row moves:

backward + upward

relative to the row in front.

The supplied drawing shows a repeated stepped arrangement rather than one continuous inclined surface.

This produces two separate functional levels around each audience position:

• the seat level;

• the foot / walking level.

That relationship is important because an aluminum bleacher is not simply five benches stacked vertically.

Each row needs a usable platform relationship between where the spectator sits and where the spectator places their feet or moves along the row.

5. What the Original “Double Pedal” Description Means Structurally

The original DragonTruss product uses the wording “Double Pedal Aluminum Grandstand.”

For DragonStructure, I would not use “double pedal” as the main product name because it is not natural English for this type of structure.

The drawing and rendering are better explained in structural terms as an aluminum bench-and-footboard arrangement, where multiple longitudinal aluminum planks form the usable surfaces across each stepped level.

The important point is not the wording “pedal.”

The structural relationship is:

steel stepped support
→ aluminum longitudinal members
→ seating surface + foot/walking surface

This explains what the customer actually receives much more clearly.

6. Aluminum Bench Seating

The seating area is formed by long aluminum bench sections rather than individual plastic stadium chairs.

This changes the way seating capacity is defined.

With individual chairs:

number of chairs = nominal seat count

With bench seating:

usable bench length ÷ allocated seating width = nominal seating capacity

The supplied configuration specifies approximately 670mm of seating space along the row.

That spacing is therefore an important planning variable.

If the required spectator spacing changes, the number of people accommodated by the same 6.5m structure may also change.

DragonStructure should therefore describe this product by row geometry and seating spacing, rather than inventing a fixed spectator capacity that is not supplied in the source material.

7. Aluminum Footboards and Walking Surfaces

The horizontal aluminum members between seating levels provide the foot and circulation zones of the bleacher.

They perform a different function from the seating bench itself.

The relationship is:

Seat Surface — where the spectator sits

Footboard / Tread Surface — where the spectator places their feet and moves along the row

Both are supported by the stepped galvanized steel substructure.

This separation between seat and tread is one of the key differences between this structure and a simple tiered bench system.

8. Three-Side Guardrail System

The original configuration includes guardrails on three sides.

From the supplied drawing and rendering, these are positioned along the:

• rear elevated edge;

• left side;

• right side.

The front remains open because the elevation reduces toward the front seating level and it is also the natural audience-facing side of the structure.

Structurally and functionally, the railings should be treated as part of the complete grandstand:

**Elevated Seating Geometry

• Open Perimeter
  → Edge Protection / Guardrail Module**

They are therefore not merely optional decoration attached after the bleacher is built.

9. How the Steel and Aluminum Parts Divide Their Jobs

One useful way to understand this product is that the materials are not randomly mixed.

They perform different jobs.

Galvanized Steel

Primarily forms the supporting frame and stepped geometry underneath the grandstand.

Aluminum

Primarily forms the surfaces directly used by spectators, including the longitudinal seating and footboard components.

Guardrail Structure

Defines and protects the elevated perimeter.

The complete system therefore follows:

Steel Below
→ Aluminum Above
→ Audience on Top
→ Guardrails Around the Elevated Edges

This material separation makes this structure fundamentally different from the previous Ringlock grandstand, even though both products solve the same overall problem: temporary elevated spectator seating.

10. Longitudinal Structural Arrangement

The front drawing confirms an overall length of 6500mm.

Across this length, the support structure is divided into repeated frame positions rather than relying on one unsupported 6.5m span.

The drawing shows repeated intermediate supports underneath the longitudinal aluminum members.

This creates a practical modular relationship:

Repeated Steel Support Frames
→ Longitudinal Aluminum Seat / Tread Members
→ Continuous Five-Row Grandstand

In other words, the audience sees long continuous aluminum benches, while underneath them the structural support is divided into multiple shorter support intervals.

This is an important part of how this type of bleacher is configured.

It should not be interpreted as a single 6.5m aluminum member freely spanning between only two end supports.

11. Side-Frame Geometry

The side view reveals the structural logic particularly clearly.

The supporting steel frame rises toward the rear and connects the different row elevations into one section.

At the rear, the frame reaches the highest seating zone and also supports the rear guardrail arrangement.

Diagonal members are visible within the rear portion of the frame.

The supplied material does not provide a calculated bracing scheme, so it would be incorrect to claim a verified lateral-load capacity from the drawing alone.

What can be stated is that the diagonal members are part of the physical steel-frame configuration shown in the supplied design.

12. Why This Is Not a Ringlock Grandstand

This structure and a Ringlock grandstand may look similar after spectators sit on them, but structurally they are organized very differently.

This is a useful example of a broader DragonStructure principle:

The same function does not require the same structural system.

Both are grandstands.

But one is a Ringlock-based grandstand, while this one is a fabricated galvanized steel-frame grandstand.

13. Assembly Logic

The supplied material does not provide a complete installation manual, but the physical modular sequence can be understood as follows.

Step 1 — Position the Main Steel Support Frames

Lay out the supporting frames along the 6.5m grandstand length according to the required spacing.

Step 2 — Connect the Steel Frames

Install the longitudinal and required connecting members so that the individual supports become one continuous grandstand base structure.

Step 3 — Complete the Stepped Support Geometry

Confirm the five row elevations and the relationship between seat supports and footboard supports.

Step 4 — Install Aluminum Footboard Components

Fit the longitudinal aluminum walking / foot surfaces onto their corresponding stepped support positions.

Step 5 — Install Aluminum Bench Sections

Install the seating members along the five rows.

Step 6 — Install Side and Rear Guardrails

Complete the three elevated perimeter protection zones.

Step 7 — Check the Complete Configuration

Verify alignment, connections, access, edge protection and project-specific requirements before use.

This sequence explains the configuration logic only and should not be treated as a project-specific engineered installation procedure.

14. The Relationship Between Length and Seating Capacity

For this bench-type grandstand, total seating capacity depends strongly on usable longitudinal seating length.

The confirmed structure is:

6.5m long

with approximately:

670mm allocated seating spacing

per person in the original configuration.

Therefore, when customers ask for another spectator capacity, the important question is not simply:

“How many rows?”

It is:

How many rows × how much usable seating length per row × what seating spacing?

Changing any of these three variables changes the overall seating configuration.

15. What Changes When the Number of Rows Changes?

Five rows define this particular structure.

If the project becomes three rows, four rows, six rows or more, several parts may change together:

• overall depth;

• maximum elevation;

• side-frame profile;

• quantity of aluminum seating;

• quantity of footboards;

• rear guardrail height/location;

• side guardrail geometry;

• support and bracing configuration.

This means that “adding one row” is not simply adding another aluminum bench.

The supporting steel geometry must also be redesigned to create that additional elevation.

16. What Changes When the Grandstand Becomes Longer?

Increasing the length affects a different direction of the structure.

For example:

6.5m → longer grandstand

normally means:

**more longitudinal seating

• more aluminum bench/footboard length

• additional or redistributed support frames

• longer rear guardrail

• revised side/end conditions where required**

The row count can remain five while spectator capacity increases horizontally.

This is different from adding additional rows, which primarily changes depth and height.

17. What Changes When Seating Spacing Changes?

The original layout uses approximately 670mm seating spacing.

This is an important parameter because a bench does not physically divide each spectator position with an individual chair.

If another project uses a different allocated width per spectator, the effective seat count per row changes even when the overall grandstand length remains exactly the same.

Therefore:

Grandstand Length ≠ Fixed Capacity

Instead:

Usable Bench Length + Seat Allocation + Row Count → Seating Layout

Final occupant capacity and applicable egress requirements should be determined according to the actual project and relevant local requirements.

18. Suitable Applications

This type of Seating & Grandstand Structure can be considered for temporary or project-specific spectator applications such as:

• sports competitions;

• school events;

• temporary viewing areas;

• outdoor performances;

• ceremonies;

• community events;

• demonstration areas;

• temporary spectator zones;

• event and competition audiences.

Whether the exact 5-row configuration is suitable for a particular site requires project-specific review.

19. Main Customization Variables

This structure should not be treated as one immutable 6.5m product.

The main variables that can change the structural configuration include:

Number of Rows

The current configuration uses five rows.

Overall Length

The current design is 6.5m long.

Overall Depth

The supplied drawing is approximately 3.05m overall.

Seating Allocation

The current layout uses approximately 670mm spacing.

Seat Type

This configuration uses aluminum bench seating rather than individual molded seats.

Footboard Arrangement

The quantity and width of longitudinal aluminum tread components can change according to the selected bleacher configuration.

Guardrail Arrangement

Side and rear railing layout depends on the final geometry and access arrangement.

Access Arrangement

Larger grandstands may require a different stair, aisle or entrance configuration.

Steel Supporting Geometry

Changes to row number, elevation or overall size may require corresponding changes to the supporting frame.

20. Information Needed for a Customized Grandstand

For another spectator project, the most useful inputs are:

• required spectator capacity;

• required number of seating rows;

• available site length;

• available site depth;

• preferred seating spacing;

• bench seating or individual seats;

• maximum permitted structure height;

• entrance locations;

• aisle requirements;

• stair/access requirements;

• guardrail requirements;

• indoor or outdoor use;

• site surface / ground condition;

• project location;

• drawings, sketches or reference photos.

The design process can then follow:

Audience Requirement
→ Row Count
→ Seating Length
→ Stepped Geometry
→ Steel Support Frames
→ Aluminum Bench & Footboards
→ Access & Guardrails

21. Engineering and Verification Boundary

This page is a structural breakdown of the supplied configuration, not a structural certification.

Confirmed information includes:

• five-row layout;

• approximately 6.5m overall length;

• approximately 3.0–3.05m depth;

• approximately 2.3m maximum overall height;

• approximately 670mm seating spacing;

• hot-dip galvanized angle-steel supporting frame;

• aluminum grandstand components;

• three-side guardrails.

The supplied page and drawing do not provide verified values for:

• spectator design load;

• distributed platform load;

• point load;

• lateral crowd load;

• guardrail design load;

• wind load;

• steel section capacities;

• foundation or anchoring requirements;

• safety factor;

• certification;

• code compliance;

• engineering approval.

These should therefore not be inferred from the drawing.

For projects where these parameters are required, they need project-specific engineering review. See Safety Standards & Engineering Constraints for the distinction between general structural information and verified project engineering.

22. Original Product Configuration

The original DragonTruss commercial page for this configuration is:

View Original DragonTruss Product — Custom 5-row Double Pedal Aluminum Grandstand with Hot Galvanized Angle Steel Frame

The two pages answer different questions:

DragonTruss:
What is the commercial grandstand product and what are its basic specifications?

DragonStructure:
How does a five-row galvanized steel-frame aluminum grandstand actually form its stepped seating structure?

Related Structure Reference

Seating & Grandstand Structure — temporary spectator seating structures using Ringlock, steel-frame and other stepped support configurations.

Safety Standards & Engineering Constraints — general principles for distinguishing configuration information from project-specific structural verification.

Structure Classification

Primary Function: Temporary Spectator Seating
DragonStructure Category: Seating & Grandstand Structure
Structure Type: 5-Row Aluminum Bleacher
Main Support System: Hot-Dip Galvanized Steel Frame
Seating System: Aluminum Bench Seating
Foot / Walking System: Aluminum Longitudinal Footboards
Rows: 5
Overall Length: 6.5m
Overall Depth: Approx. 3.0–3.05m
Maximum Overall Height: Approx. 2.3m
Seating Allocation: Approx. 670mm per position
Edge Protection: Three-Side Guardrail System
Main Structural Logic: Galvanized Steel Stepped Frame + Aluminum Seating/Footboards + Perimeter Guardrails