Key Points for Load-Bearing Calculation of Suspended GRC Features? Load-Bearing Calculation Standards and Safety Assurance

Suspended GRC profiles have no bottom support, so load-bearing calculations directly relate to structural safety. It is necessary to comprehensively consider load factors and structural load-bearing capacity, and prevent the risk of falling through precise calculations. Drawing on its experience with the suspended GRC project at Guangzhou Dongzhu Shangdu Commercial City, Qinglong analyzes the key points of load-bearing calculation and safety assurance measures.

I. Load Types and Value Selection Standards

Comprehensively identifying load types and precisely selecting values is the foundation of load-bearing calculation. Dead load calculation: includes the self-weight of GRC components (density approximately 1800kg/m³), the weight of connectors, and the weight of surface coatings, which must be precisely calculated based on actual dimensions; the self-weight of each suspended component must be accurate to the kilogram, and Qinglong adds an extra 5% safety margin in its calculations. Live load values: consider maintenance loads (≥2.0kN/㎡) and wind loads (values based on regional wind pressure grades; ≥0.7kPa in coastal areas); typhoon regions must consider instantaneous wind pressure amplification factors (1.2-1.5). Accidental load consideration: reserve for seismic loads (values based on local seismic intensity) and impact loads (≥1.0kN) to ensure structural safety under extreme conditions; Qinglong adds an extra 10% seismic load reserve in projects in high-intensity earthquake zones.

II. Key Points of Component Strength Calculation

The strength of the components themselves is the core of load-bearing safety and must meet force requirements. Bending strength calculation: calculate the maximum bending moment based on the component span and load distribution, ensuring GRC bending strength ≥15MPa (high-quality GRC can reach over 20MPa); long suspended components require additional reinforcing ribs to improve bending capacity. Shear strength calculation: focus on calculating the shear strength at the connection between components and connectors, ensuring shear strength ≥2.5MPa to prevent shear failure at connection points. Stability verification: for slender suspended components, verify compression bar stability and control the slenderness ratio ≤120 to prevent compression buckling; in a suspended GRC line project in Shenzhen, Qinglong improved stability by adding lateral supports.

III. Load-Bearing Calculation of Connectors and Anchoring Systems

Connectors and anchoring systems are key to load transfer and require precise calculation of load-bearing capacity. Connector selection calculation: select stainless steel connectors of appropriate specifications based on the total load; each connector should have a load-bearing capacity ≥10kN, and the number of connectors should be configured at 1.5 times the total load; Qinglong uses 304 stainless steel connectors to ensure load-bearing safety. Anchoring depth calculation: the anchoring depth of chemical anchor bolts must be ≥10d (d is the anchor bolt diameter); mechanical anchors must meet base material strength requirements, with concrete base material compressive strength ≥20MPa; anchoring force must be verified through on-site pull-out tests, with pull-out force ≥1.2 times the design value. Joint strength verification: calculate the joint strength between connectors and components, and between anchoring points and the main structure, to prevent joints from becoming weak links in load-bearing.

IV. Load-Bearing Calculation Verification and Safety Redundancy Design

Multiple verifications and redundant design ensure fail-safe load-bearing safety. Software simulation verification: use finite element analysis software such as ANSYS to simulate the stress state of suspended GRC profiles under different load combinations and verify the accuracy of calculation results; Qinglong always performs software simulation for large suspended projects. Model test verification: for super-large suspended GRC profiles, produce 1:1 models for load tests to test structural load-bearing capacity and deformation, ensuring design requirements are met. Safety redundancy design: use a safety factor of 1.2-1.5 in load-bearing calculations and increase the number of connectors by an extra 20% to reserve sufficient safety margins; Qinglong implements strict redundancy design standards in all suspended GRC projects to ensure long-term safety in use.