INDUSTRY COMPONENT

Chord Members

Primary compression/tension structural members in lattice boom crane systems that form the main load-bearing framework.

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Component Specifications

Definition
Chord members are the principal longitudinal structural elements in lattice boom crane configurations, designed to withstand axial compressive and tensile forces during lifting operations. These members form the outer framework of the boom structure, connected by diagonal and vertical lacing members to create a rigid truss system capable of handling significant bending moments and dynamic loads while maintaining optimal strength-to-weight ratio.
Working Principle
Chord members function as the primary load-carrying elements in lattice boom structures through axial force transmission. During crane operation, the top chords primarily resist compressive forces while bottom chords handle tensile forces, with load distribution optimized through the truss geometry. This configuration minimizes material usage while maximizing structural integrity and load capacity.
Materials
High-strength low-alloy steel (HSLA) grades ASTM A572 or equivalent, typically with yield strength of 345-690 MPa. Common specifications include ASTM A500 for structural tubing or ASTM A36 for plate construction, with corrosion protection through hot-dip galvanizing or specialized coatings.
Technical Parameters
  • Length 6-30 meters (modular sections)
  • Cross-section Square/Rectangular tubing: 150x150mm to 400x400mm
  • Surface finish Shot blasted and painted/galvanized
  • Wall thickness 6-25 mm depending on load rating
  • Connection type Bolted flange or pinned connections
  • Weight capacity 50-500 tons (system dependent)
Standards
ISO 4301, ISO 8686, DIN 15018, ASME B30.5

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Chord Members.

lattice boom chord members crane structural components heavy machinery parts construction equipment load-bearing members truss boom components Chord Members Chord Members in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Lattice Boom

A structural component of a lattice boom crane consisting of interconnected steel members forming a truss structure for load lifting and positioning.

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Engineering Analysis

Risks & Mitigation
  • Fatigue failure from cyclic loading
  • Corrosion in harsh environments
  • Buckling under compressive overload
  • Connection joint failure
  • Material defects or weld imperfections
FMEA Triads
Trigger: Cyclic loading exceeding fatigue limits
Failure: Crack initiation and propagation leading to structural failure
Mitigation: Regular non-destructive testing (NDT), proper load cycle monitoring, and adherence to design fatigue limits
Trigger: Corrosive environment exposure
Failure: Section loss and reduced load capacity
Mitigation: Proper corrosion protection systems, regular inspection, and timely maintenance
Trigger: Improper assembly or connection torque
Failure: Joint failure leading to catastrophic collapse
Mitigation: Strict adherence to assembly procedures, torque verification, and connection inspection protocols

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±2mm for length, ±1.5mm for straightness, ±1° for angular alignment
Test Method
Ultrasonic testing for material integrity, magnetic particle inspection for surface defects, load testing to 125% of rated capacity

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of chord members in a lattice boom?

Chord members serve as the main longitudinal structural elements that carry axial compressive and tensile loads, forming the primary framework that determines the boom's load capacity and stability.

How are chord members connected in lattice boom systems?

Chord members are typically connected using bolted flange joints or pinned connections at panel points, with diagonal and vertical lacing members providing lateral stability and load distribution between chords.

What materials are commonly used for chord member construction?

High-strength low-alloy steel (HSLA) grades such as ASTM A572 or equivalent are standard, offering optimal strength-to-weight ratios with corrosion protection through galvanizing or specialized coatings.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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