LGS steel frame house load-bearing standards
With the rise of green building concepts, LGS steel frame houses, with their high efficiency and environmental friendliness, have gained a significant position in the prefabricated and modular construction sectors. Their load-bearing standards, as a core indicator for ensuring building safety, have garnered widespread attention within the industry. This article analyzes the load-bearing specifications and key technical aspects of LGS steel frame houses, drawing on national standards and real-world project examples.
1. Load-Bearing Standards: Classified by Function for Precise Design
According to the "Building Structural Load Code," the floor load-bearing standards for LGS steel frame houses are categorized by function:
Civil Buildings: The live load standard for ordinary residential buildings and office buildings is 2.0 kN/m²; this is increased to 2.5 kN/m² for classrooms, hospital clinics, and other areas; and 3.0 kN/m² for auditoriums and public laundries.
Special Function Areas: The live load standard for crowded spaces such as shops and exhibition halls is 3.5 kN/m²; while dynamic load areas such as gymnasiums and stages require 4.0 kN/m². High-load scenarios: In areas with concentrated static loads, such as library and archives, the load-bearing standard can reach 5.0 kN/m². Ventilation machine rooms and elevator rooms can even require 7.0 kN/m².
The design must consider both the dead load (structure deadweight) and live load (service load), multiplying the load by a load factor of 1.4 to ensure safety in extreme conditions.
2. Technical Advantages: Lightweight and High Strength
LGS steel frame houses manufacturer are primarily constructed of Q235 or Q355 grade steel, achieving thin-walled, high-strength properties through cold-bending technology. Their deadweight is only one-quarter that of traditional brick-concrete structures, significantly reducing foundation costs. They also offer excellent wind resistance, capable of withstanding a Category 12 typhoon. Engineering practice has demonstrated that portal frame structures can effectively distribute concentrated loads through the rational arrangement of wind-resistant columns and support systems. For example, in a 20-meter-span factory building project, the 4.36-ton weight of stacked color-coated steel plates was evenly supported by two steel beams, achieving an actual load-bearing capacity of 1.4 times the design standard.
3. Engineering Verification: A Closed Loop from Testing to Application
In the integrated industrial park project, the 30,000-square-meter prefabricated light steel system building underwent rigorous material testing and structural verification, achieving full quality control from component prefabrication to on-site assembly. The inspection report showed that indicators such as steel component thickness deviation, weld quality, and coating adhesion all met the GB50205-2001 standard, and the measured deflection of the crane beam was far below the limit of L/300. This case demonstrates that LGS structures can reduce construction time by over 30% while meeting load-bearing standards and achieving a material recovery rate of over 90%.
4. Industry Trend: Standardization and Digital Collaboration
With the implementation of the General Code for Steel Structures, LGS design is shifting from empirical research to performance-based design. Finite element analysis (FEA) simulations of complex load conditions, combined with BIM technology for parametric optimization, have become the mainstream approach. For example, a high-rise building project using a steel frame design used STAAD Pro software to conduct multi-magnitude seismic response analysis to ensure that the load-bearing system meets regulatory requirements in both the elastic and plastic stages.
