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Area of Science:

  • Structural Engineering
  • Mechanical Engineering
  • Materials Science

Background:

  • Circular hollow section (CHS) steel joints are vital in constructing large-span structures like airport halls.
  • The nodes in ramified vertical columns, formed by connecting inclined pipes to a vertical one, represent structural weak points due to geometric complexity.
  • Existing design codes inadequately address the unique geometrical properties and limitations of these atypical CHS joints.

Purpose of the Study:

  • To numerically investigate the structural resistance of atypical two-dimensional CHS joints.
  • To analyze the influence of geometrical parameters, specifically the inclination angle between members, on joint behavior.
  • To evaluate the stability and load-carrying capacity of these non-standard steel joints.

Main Methods:

  • Finite Element Analysis (FEA) was employed for numerical case studies.
  • A small-scale model was initially analyzed to understand the effect of inclination.
  • The study progressed to extended pipe geometries to assess broader behavioral changes.

Main Results:

  • The inclination angle between the pipes critically affects stresses and deflections at the joint node.
  • An increased inclination angle leads to a higher maximum applied force capacity.
  • Modifications in member geometry alter the joint's behavior and stress distribution patterns.

Conclusions:

  • The inclination angle is a key design parameter for atypical CHS joints, directly influencing structural performance.
  • FEA provides a viable method for assessing the resistance of CHS joints excluded by current standards.
  • Further research into extended member geometries can optimize the design of these critical structural components.