Prefabricated High Strength Steel Truss Joist Aws D1.1 Warehouse Floor Support

Product Description

This Prefabricated High Strength Steel Truss Joist is a standardized secondary load-bearing structural member engineered for warehouse and industrial floor systems, fully fabricated in compliance with AWS D1.1 structural welding specification. Adopting open-web truss mechanical architecture, it achieves an optimized strength-to-weight ratio compared with solid steel beams, delivering stable long-span bearing performance while reserving unobstructed internal space for MEP service integration. All structural components are processed and welded off-site under controlled factory environments to eliminate the uncertainty of field manual fabrication, effectively reducing construction cycle duration and total labor expenditure for general industrial building projects. The product adopts high-strength carbon and low-alloy structural steel, with uniform stress distribution across the truss frame to minimize long-term deflection under static stacking loads.

Structural Composition & Mechanical Principle

The complete steel truss joist assembly consists of four core force-bearing components, forming a triangular stable force transmission system conforming to classical truss mechanical theory:
1.Top Chord: Bears vertical compressive load transferred from floor slabs; thickened high-strength steel plate resists compressive deformation and local buckling;
2.Bottom Chord: Carries horizontal tensile stress generated by floor load, balancing overall structural internal force;
3.Diagonal Web Members: Cross-arranged steel strips create hollow open cavities for mechanical, electrical and plumbing penetration, while transferring shear force between upper and lower chords;
4.Reinforced Bearing Ends: Thickened welded support base for mounting onto primary main beams, enhancing joint rigidity and anti-shear capacity. 
All component junctions are full fillet welded per AWS D1.1 qualified welding procedures, forming an integral rigid frame with clear load transfer paths and consistent structural stiffness.

Specification

Parameter Category	Detailed Technical Data
Applicable Structural Systems	Multi-story industrial warehouse, single-span logistics storage, factory mezzanine floor, commercial long-span steel frame
Allowable Steel Material Grades	Q235B carbon structural steel, Q355B low-alloy high tensile structural steel with certified tensile yield strength
Welding Execution Standard	AWS D1.1 prequalified WPS, full visual inspection of all fillet and groove welds, welder qualification certification required
Dimensional Manufacturing Tolerance	Overall linear length tolerance ±2mm, vertical flatness deviation ≤1/1000 of span, section height error ±1.5mm
Standard Connection Solutions	Grade 8.8 high-strength bolt assembly, on-site full penetration butt welding, auxiliary angle bracket fixing
Linear Unit Weight Scope	12kg/m to 45kg/m, adjusted by design span and specified floor load capacity
Maximum Custom Single Span	30 meters, meets ultra-long span industrial structural design requirements without intermediate columns
Anti-corrosion Surface Service Life	Epoxy anti-rust paint system: 5–8 years indoor service life; hot-dip galvanized coating: 20+ years anti-corrosion for coastal humid environments

Core Structural & Construction Advantages

1.Optimized High-strength Material Performance 
Low-alloy high tensile steel raw material provides superior anti-deformation and anti-deflection performance, stable under long-term heavy stacking loads typical of warehouse storage floors, avoiding permanent bending deformation of solid section beams.
2.AWS D1.1 Standardized Welding Consistency 
Uniform factory welding executed under certified AWS D1.1 procedures eliminates inconsistent workmanship of field welding; all weld seams follow standardized inspection criteria to guarantee joint structural safety and fatigue resistance.
3.Prefabrication Optimizes Construction Efficiency 
100% off-site cutting, forming and welding delivers finished truss units ready for direct installation; only simple bolt assembly operations are required on construction sites, drastically shortening project erection schedules and cutting labor input costs.
4.Open-web Design Integrates MEP Layout 
Continuous hollow cavities between diagonal web members allow direct routing of ventilation ducts, electrical conduits and sanitary pipelines without field drilling or cutting, reducing floor height occupation and lowering overall building structural investment.
5.Full Customization for Global Code Adaptability 
Truss span, section height, chord thickness, load rating and anti-corrosion surface treatment can be fully customized to match regional building codes across Europe, North America, Southeast Asia and other international markets.
6.Modular Exposed Structural Aesthetics 
Neat linear modular profile can be retained as visible architectural structure without additional ceiling enclosure, simplifying interior finishing works for modern industrial and warehouse buildings.

Universal Application Scope

Production Flow & Multi-stage Quality Control

This AWS D1.1 certified high strength steel truss joist serves as standardized secondary floor support component for all long-span industrial steel frame structures, with universal adaptability across mainstream building categories:
• Storage & distribution warehouse: Eliminates intermediate support columns to maximize continuous usable storage area;
• Manufacturing production factory: Supports mezzanine floor loads of production machinery and raw material stacking;
• Cross-border logistics center: Complies with multi-layer heavy rack load design specifications for high-frequency cargo access;
• Large commercial exhibition venue: Realizes barrier-free ultra-long-span interior space for large-area exhibition layout. 
The product's standardized mechanical performance makes it compatible with most mainstream steel frame structural design systems worldwide.

The full fabrication workflow strictly complies with three international authoritative standards: AWS D1.1 structural welding code, ISO9001 quality management system and EN1090 steel structure product certification, with multi-layer progressive inspection links to control overall structural quality:
• Raw Material Incoming Inspection: Tensile strength and chemical composition testing of all steel plates to screen unqualified base materials;
• CNC Precision Cutting: Computer numerical control blanking ensures consistent dimensional accuracy of all chord and web components;
• Standardized Welding Workshop Operation: Certified welders operate automated welding equipment in strict accordance with AWS D1.1 WPS parameters, with real-time monitoring of welding current, voltage and thermal input;
• Post-weld Form Calibration: Straightening and flatness correction of welded truss units to eliminate welding thermal deformation;
• Anti-corrosion Surface Treatment: Shot blasting rust removal, primer and topcoat painting or hot-dip galvanizing processed as per customer technical requirements;
• Sampling Static Load Simulation Test: Random finished unit load testing to verify actual bearing capacity before shipment release. 
All finished products carry a 12-month structural quality warranty covering manufacturing defects related to welding and material processing.

Full-range Customization Service System

A complete one-stop customized service system is provided to match diverse personalized design requirements of global structural engineering buyers, covering all core structural parameters:
• Dimensional Customization: Adjustable truss span, overall section height, chord plate thickness and web member spacing based on architectural structural drawings;
• Load Rating Customization: Modify steel section thickness and truss internal layout to satisfy light, medium and heavy industrial floor load specifications;
• Anti-corrosion Surface Customization: Three optional processing schemes including ordinary anti-rust paint, medium-duty epoxy coating and hot-dip galvanization;
• Joint Connection Customization: Multiple installation joint schemes for different on-site construction environments, including bolted and welded end configurations. 
The internal structural engineering team supports free 3D parametric modeling, structural load calculation reports and standardized construction installation drawing output, with remote or on-site technical guidance available upon client request.

Packaging & Shipping

All finished steel truss joists are bundled with high-tensile steel strapping to prevent shifting, collision and scratch damage during long-distance ocean transportation. Each bundle is wrapped with waterproof plastic film to block dust, moisture and salt fog erosion during maritime transit. The overall bundle dimensions are adjusted flexibly according to customized truss span to fit standard container sizes. We can provide professional container loading layout schemes to maximize container space utilization and effectively reduce total sea freight cost for bulk orders. All bundled goods are marked with clear labels including product specification, quantity and project code for convenient receiving and sorting at destination ports.

After Sales Service

We provide full-cycle systematic after-sales service for all global purchasers. Free professional quotation with detailed cost breakdown will be offered immediately after receiving structural drawings. We keep clients updated on real-time production progress and deliver complete factory inspection reports before shipment. Standard installation manuals, assembly video tutorials and online real-time remote technical consultation are available to solve on-site erection problems. Matching high-strength connecting bolts and auxiliary installation accessories can be supplied at factory cost for later maintenance demands. Stable preferential factory prices are provided for long-term bulk repeat orders from engineering contractors and steel component importers.

Company Profile

Hangzhou FAMOUS Steel Engineering Co., Ltd. is a professional integrated manufacturer of prefabricated steel structural components located in Hangzhou, China. We focus on the R&D, production and global supply of standardized and customized steel truss joists, steel beams, steel columns and other structural supporting parts. Our factory owns large automated production workshops equipped with CNC cutting machines, automatic welding lines and complete anti-corrosion treatment equipment. All manufacturing activities are implemented under AWS D1.1, ISO9001 and EN1090 international quality standards. We have rich export experience to Europe, Southeast Asia, North America and Australia, supplying qualified structural components for various industrial and commercial steel construction projects. We adhere to factory direct sales mode with stable quality and competitive prices, providing full-cycle technical support for all overseas partners. We sincerely welcome global structural engineers, warehouse builders and steel distributors to establish long-term win-win cooperation.