What factors contribute to the damage of bolted sphere trusses?

 As a common and crucial spatial structural form, bolted sphere trusses play a vital role in various buildings. However, during actual use, multiple factors may lead to their damage, posing potential threats to building safety. Gaining a thorough understanding of these damage factors is essential for ensuring the safe and stable operation of bolted sphere trusses.

Load and Structural Load-Bearing Capacity Issues

Load variations are a primary cause of damage in bolted sphere trusses. During use, live loads may increase due to changes in building purpose—such as converting warehouses to store heavy equipment—exceeding design capacities. Extended service life leads to accumulated fatigue damage in steel, reducing load-bearing capacity. Updates to standards and codes may also render original designs non-compliant. These factors can trigger structural overload, causing member deformation, joint loosening, and other failures.

Accidental Deformation and Damage to Components

Damage such as unexpected deformation or twisting of components severely impacts bolted ball grid structures. Improper protection during construction can cause dents from collisions. During use, natural disasters like strong winds or earthquakes may induce twisting deformation. Such damage weakens the cross-section of components, leading to member warping and cracking at connection points. This reduces the load-bearing capacity of components, making the grid structure more susceptible to failure under loads and jeopardizing overall structural stability.

Impact of Temperature Differences

Significant temperature variations are a major cause of damage in bolted spherical joint space frames. Steel exhibits pronounced thermal expansion and contraction, and large temperature fluctuations can cause component deformation and cracking. In regions with substantial diurnal temperature variations, frequent expansion and contraction of frame members can lead to bolt loosening and member cracking. Winter cold temperatures cause steel to become brittle, making it more prone to fracture under load. while summer heat causes member expansion, triggering a surge in internal stresses that deforms and cracks connection points.

Corrosion-Induced Section Weakening

Compound corrosion and galvanic effects are key contributors to bolted sphere truss failure. Acidic or alkaline compounds near industrial facilities, galvanic reactions in humid environments, and high-salinity air near coastal areas all accelerate steel corrosion. Corrosion reduces the effective cross-sectional area and load-bearing capacity of components, potentially leading to structural failure.

Design, Construction, and Operational Errors

Mistakes in design, manufacturing, construction, and usage can also damage bolted sphere trusses. Design flaws like inaccurate stress analysis or improper section/joint design create hidden hazards; poor material quality and rough fabrication during production compromise component performance; During construction, loose bolts, welding defects, and installation errors reduce overall stability. In use, unauthorized overloading or arbitrary component modifications directly threaten structural safety.

To prevent such potential damage, reinforcing bolted sphere space frames is an effective approach. Implementing structural reinforcement at problem locations can enhance load-bearing capacity at damaged areas and prevent structural instability.

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