Common Materials

Jiangsu Shengteng Steel Structure Engineering Co., Ltd.

I. Common Steel Pipe Materials for Space Frame Structures

1. Common Materials

2. Common Steel Pipe Sections

3. Main Properties of Steel

• Yield strength fy

• Q235: 235 MPa

• Q355: 355 MPa

• Q390: 390 MPa

• Tensile strength fu

• Elastic modulus E = 2.06 × 10⁵ MPa

• Poisson’s ratio ν = 0.3

• Density ρ = 7850 kg/m³

• Load-bearing characteristics of steel pipes:
  High stability under compression, excellent tensile performance, relatively weak bending capacity, but very suitable for members mainly subjected to axial force.

II. Design Data for Space Frame Structures

(Design process and basis)

1. Design Basis 

Common standards and codes:

• Technical Specification for Space Frame Structures

• Code for Design of Steel Structures

• Load Code for the Design of Building Structures

• Code for Acceptance of Construction Quality of Steel Structures

• Code for Acceptance of Construction Quality of Space Frame Structures

2. Design Parameters

(1) Load Parameters

• Dead loads: self-weight of steel pipes, roofing panels, ceilings, etc.

• Live loads: roof live load, maintenance load

• Wind load: calculated according to local load requirements

• Snow load: calculated according to local load requirements

• Seismic action (where applicable)

(2) Structural Layout Parameters

• Space frame layout types:

• Orthogonal (regular) square pyramid space frame

• Diagonal square pyramid space frame

• Triangular pyramid space frame

• Single-layer shell, double-layer shell

• Grid size: typically 1.5 m – 3.5 m

• Unit height: generally H = L/10 – L/15
  (H: height of space frame unit; L: span)

(3) Member Design

• Tension members: designed according to tensile capacity

• Compression members: designed according to stability (Euler buckling / member buckling)

• Member ends shall satisfy the joint welding and detailing requirements

(4) Joint Design

Common joint types:

• Bolt-ball joints (most common in China)

• Welded ball joints

• Intersecting (fish-mouth) welded joints (commonly used for large spans)

• Cast-steel joints (special structures)

Main verification items for joints:

• Bolt shear and axial forces

• Bearing of the spherical body

• Weld strength

• Thickness of joint plates

III. Related Information on Space Frame Structures

(Detailing / Fabrication / Acceptance)

1. Detailing Requirements

• Joints must have sufficient stiffness

• Member length tolerance: ≤ L / 1500

• Weld testing (ultrasonic / radiographic) generally to Grade II

• Member ends require bevel preparation (for welded ball joints or intersecting welded joints)

2. Fabrication and Erection

• Fabrication process:
  Steel pipe cutting → End preparation → Assembly → Welding → Anti-corrosion

• Erection process:
  Ground assembly → High-level assembly → Overall lifting / sectional lifting

• Anti-corrosion:
  Blast cleaning to Sa2.5, then apply epoxy zinc-rich primer + finish coats

3. Acceptance Documentation

Includes:

• Material certificates (for steel pipes and welding materials)

• Fabricated member inspection records

• Weld testing reports

• Overall deformation survey report of the space frame

• Construction quality inspection and acceptance records

• Load test report (where applicable)

Dear customer,, hello! Thank you for choosing us and giving us the opportunity to introduce you. We are a professional space structure processing factory, focusing on the design and manufacturing of bolt ball grids, providing various types of space structures and space structure accessories. We strive to turn every space structure product into a work of art with our fine production technology and honest service attitude.

We promise to design and provide detailed data models for free, and you can check the project quantities at any time. If you have any questions about our services or need help, please feel free to contact us at any time, we will serve you wholeheartedly.

I sincerely wish you good health and success in your work! Looking forward to your cooperation!

Dear Customer [Letter of Commitment]

       We value your trust and business. Here, we solemnly promise to provide you with first-class service and high-quality products.

       We promise that we will strictly abide by the following regulations at all times:

Free design: We will provide you with free design services and customize a design plan that suits you based on your needs and requirements. We understand the importance of design, so we will do our best to provide you with the best design solution.

Provide design data model: We will provide you with design data model free of charge so that you can review the project quantities at any time. We promise that we will do our best to ensure the accuracy and completeness of the design data models provided.

Double refund: If you find that there is an imaginary quantity in the project quantity at any time, we will refund double the difference. We promise that we will always be customer-centric and take the interests of our customers as the highest standard.

      We know very well that words are not what we say, so we decided to write the above commitments in black and white into the contract. Of course, you can also provide drawings, and we will process them according to the list of drawings you provide. In order to ensure fair transactions between both parties, we recommend using the weighing settlement method for settlement. In this way, you don’t have to worry about us cheating you, and you can be sure that you get what you pay for!

Finally, we thank you again for choosing us as your partner. We look forward to establishing a long-term and stable cooperative relationship with you and achieving a win-win situation together.

Jiangsu Shengteng Steel Structure Engineering Co., Ltd.

September 25, 2023

Please note: The above content is for your reference only, and the specific content can be adjusted and modified according to your needs. At the same time, it is recommended that you read the terms of the contract carefully before signing the contract to ensure that you recognize and understand the content of the contract. We promise to design and provide data models for free, and you can check the project quantities at any time. If an imaginary quantity is found, we double the backoff. We are based on integrity and write the contract in black and white. You can also provide drawings, and we will process them according to the drawing list. It is recommended to use weighing for settlement, so that you can shop with peace of mind. We always adhere to the principle of "you get what you pay for", allowing you to choose with confidence.