Roof Truss Support Bracket

I. Product Introduction

Roof truss support bracket, also known as load-bearing beam, is a specialized load-bearing component for industrial building steel structure roofs. It is widely used in large-span bay renovation and column grid optimization projects, suitable for industrial production and factory traffic supporting building roof structure construction. The bracket core load-bearing relies on beam body load transmission, serving as central roof truss support. The main body adopts parallel chord standard truss structure, with web members combined with herringbone force system featuring longitudinal bars, providing balanced structural force transmission, suitable for factory large-span column removal roof construction.

From an engineering definition perspective: industrial buildings need to meet production flow, equipment passage, and factory traffic requirements, requiring local removal of vertical load-bearing columns to expand single-span bay area. At this point, roof truss brackets need to be installed at column positions on both sides of the bay to replace original columns and bear the overall roof load, ensuring roof structural integrity and stability. Brackets are divided into two major installation types: components supported on reinforced concrete columns uniformly adopt lower-support installation structure; components supported on steel columns uniformly adopt upper-support installation structure. The overall bracket height and panel dimensions are comprehensively designed considering roof end elevation, structural rigidity, project cost, and joint construction feasibility, suitable for various standardized and non-standard factory steel structure roof renovation and new construction projects, and can be custom manufactured and site-assembled according to architectural drawings.

II. Core Engineering Parameters

  1. Structural System Parameters

Overall truss form: Parallel chord truss; Web member system: Herringbone web members with longitudinal bars; Installation classification: Lower-support type, Upper-support type

Installation adaptation: Lower-support type suitable for reinforced concrete column bases; Upper-support type suitable for steel load-bearing column bases

  2. Dimensional Design Parameters

Bracket height value: Calculated based on typical single-span distance, conventional value is 1/5 to 1/10 of single-span distance, balancing structural stiffness and construction economy;

Standard panel length: Industry standard panel lengths are 2m and 3m, adjustable according to roof purlin layout and load point positions;

Adapted bay span: Conventionally suitable for factory 6m-36m large-span column removal roof engineering; ultra-large bays can be assembled in segmented combinations;

  3. Material and Process Parameters

Main material: Q235B, Q355B structural steel commonly used, mechanical properties comply with national steel structure construction standards;

Anti-corrosion process: Outdoor factory standard sandblasting rust removal + epoxy zinc-rich primer anti-corrosion; high-humidity, dusty factory areas can customize thickened anti-corrosion coating;

Connection process: Factory prefabricated welding, site high-strength bolt assembly, reducing site welding workload, controllable joint forces;

  4. Load Adaptation Parameters

Adapted loads: Bears roof self-weight, wind and snow loads, maintenance live loads; load values are customized based on factory regional meteorological parameters and roof structure calculations;

Deflection control: Post-completion structural deflection complies with steel structure roof acceptance standards, ensuring roof drainage and truss deformation control.

III. Core Structural Features

1. Standardized force system: Adopts parallel chord main truss + herringbone web members with longitudinal bars composite structure, loads transmit linearly along beam body, dispersing single-point bearing pressure, avoiding local member stress overload, suitable for factory long-term static and alternating load conditions.

2. Clear installation system classification: Zone-adapted for steel column and concrete column bases, upper-support and lower-support structures with targeted optimized joint construction, fitting different column compressive and shear force characteristics, high joint fit, no need for site base modification.

3. Strong dimensional design adaptability: Bracket height and panel length follow architectural economic design principles, height designed based on span ratio, 2m and 3m standard panels adapt to market-standard roof purlin layout modules, suitable for new and old factory renovation construction.

4. Excellent structural stability: Longitudinal bars with herringbone web members provide bidirectional limiting, improving truss out-of-plane stiffness, reducing lateral deformation from roof wind pressure and vibration, enhancing overall roof lateral resistance.

5. High prefabrication level: Factory standardized cutting and welding, member holes and bevels prefabricated in advance, site only requires bolt assembly, strong member compatibility, moderate construction tolerance.

6. Adapted for column removal construction: Specially developed for factory removal of intermediate columns and widening of passage bays, no need to modify original roof truss main body, simply add brackets to complete structural force transfer.

IV. Comprehensive Engineering Advantages

1. Factory space optimization: Can eliminate central vertical load-bearing columns, open up workshop production channels and vehicle passage channels, optimize factory plane usage space, suitable for large equipment access and assembly line full-area layout needs.

2. Balanced construction economy: Bracket height designed by span ratio, balancing structural rigidity and material volume, compared to complete roof steel structure rebuild, material cost and construction period are more controllable, suitable for small and medium factory renovation and expansion budget standards.

3. Multi-base condition adaptation: Dual-system structure fully covers concrete column and steel column bases, same project with different column types can be equipped with corresponding brackets, unified construction standards, reducing project selection difficulty.

4. Convenient later maintenance: Truss member layout is regular, maintenance points are open, later anti-corrosion renovation, member inspection, and roof maintenance are convenient; standard panel members can be individually replaced without dismantling the entire roof structure.

5. Compliance with civil engineering standards: Structural design fits industrial building steel structure design codes, joint construction, height ratio, and panel dimensions all follow industry-standard design guidelines, can cooperate with engineering drawing approval and completion acceptance.

6. Minimal renovation construction disturbance: Relies on both sides original columns for load-bearing, does not damage original factory foundation, walls, roof enclosure structure, renovation and expansion have minimal impact on original factory production operations.

V. Application Scenarios

1. Industrial production buildings: Machining workshops, storage warehouses, prefabricated production workshops, central column removal, widening workshop crane passage and large material transfer bays, bearing portal roof truss loads.

2. Factory traffic supporting buildings: Factory guard corridors, vehicle passage canopies, factory intermodal corridors, large-span column-free roof construction, ensuring unobstructed vehicle and personnel passage.

3. Old factory renovation and expansion projects: Old steel structure and concrete roof factories with unreasonable column grid layout and small bay dimensions, add brackets for column removal and capacity expansion, optimizing factory usage area.

4. Large-span auxiliary rooms: Factory batching sheds, raw material yards, enclosed silos, large-span column-free roof construction, suitable for outdoor and semi-outdoor wind pressure load conditions.

5. Supporting public buildings: Park pump rooms, power distribution room auxiliary roofs, large-span lightweight roof load-bearing construction, suitable for small public building structural optimization construction.

VI. Selection and Installation Precautions

1. Base selection: Reinforced concrete column tops use lower-support brackets; steel load-bearing column tops use upper-support brackets, installation systems must not be mixed.

2. Height selection: Strictly calculate height based on project single-span distance, value controlled within 1/5 to 1/10 of span, high wind and snow areas recommend selecting larger values within the range to improve structural stiffness.

3. Panel selection: Standard roofs use 2m standard panels; heavy-load roofs and high-density purlin layout roofs prefer 3m panels to reduce the number of joints.

4. Customization instructions: Can customize member wall thickness, joint plate thickness, and anti-corrosion coating process based on project wind and snow loads, anti-corrosion grade, and column dimensions; manufacturer provides specialized force calculation plan based on construction drawings.

5. Property rights instructions: Manufacturer reserves the right to optimize structural details and fine-tune processes; optimized members fit original installation dimensions without affecting site assembly use.

VII. Frequently Asked Questions (FAQ)

Q1: Can upper-support and lower-support brackets be modified and mixed on site?

A: On-site unauthorized modification and mixing is not recommended. The two types of brackets have different joint compressive and shear constructions, adapted to different column force logic. Mixing will alter joint forces and affect structural safety. Selection must correspond to column material.

Q2: How can brackets improve stability in areas with high wind and snow?

A: First, select bracket height at the larger 1/5 span value to improve truss stiffness; second, thicken web member wall thickness and add lateral tie members; third, upgrade anti-corrosion coating for outdoor harsh climate.

Q3: Can brackets be installed on old concrete factories with insufficient column top bearing capacity?

A: Column top bearing capacity must be verified first. If insufficient, column top reinforcement cap can be added before installing lower-support brackets. Direct installation is not permitted.

Q4: Can standard 2m and 3m panels be combined for non-standard bays?

A: Yes, standard panels can be combined with adjusted non-standard short sections for non-standard bay dimensions, with overall force still meeting roof load requirements.

Q5: What maintenance work is needed after bracket completion?

A: Annual inspection of high-strength bolt tightness, member corrosion, and joint deformation; timely reapplication of anti-corrosion coating on corroded areas to ensure long-term structural condition.

Q6: Can brackets adapt to both color steel roof and concrete roof structures?

A: Both are adaptable; simply adjust truss member specifications based on roof self-weight load, suitable for the two mainstream factory roof construction types on the market.