Compression Behavior of Square Pyramid Substructure of Novel Pultruded FRP-Aluminum Space Truss
Publication: Journal of Composites for Construction
Volume 24, Issue 6
Abstract
To realize lightweight and corrosion resistance, a novel hybrid pultruded fiber-reinforced polymer (PFRP)-aluminum space truss system is proposed, which adopts the pretightened teeth connections (PTTCs) and aluminum–bolt–ball connecting system (ABCS). The diagonal and chord members of the system are joined by the ABCSs to form a free-form space truss. To identify possible failure modes, reveal the bearing mechanism, and investigate suitable design methods, compression experiments were separately conducted on two square pyramid substructures. Two loading scenarios were designed for the compression experiments, with top ball rotation unconstrained and constrained denoted as loading scenarios 1 and 2, respectively. Different failure modes, load–strain, and load–displacement responses were recorded. The joint instability phenomenon occurred in loading scenario 1, resulting in the bending failure of the ABCSs around the top ball. Buckling induced splitting failure of the PFRP tube occurred in loading scenario 2. In addition, the pyramid substructure was numerically modeled by a series of line elements and this model could accurately and directly predict the nonlinear compression behavior of the square pyramid substructure. Finally, a direct second-order analysis was recommended for the design of PFRP space truss structures, which could avoid the difficulty in determining the effective length factor and yield a more accurate and reliable structural design.
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Acknowledgments
Support from the National Natural Science Foundation of China (No. 51778620), National Key Research and Development Program of China (Award No. 2017YFC0703008), and Foundation & Frontier technology innovation projects (2019-33) are gratefully acknowledged.
Notation
The following symbols are used in this paper:
- cij
- the Tsai–Wu coupling coefficient (dimensionless);
- E1
- longitudinal modulus of elasticity (GPa);
- E2, E3
- transverse modulus of elasticity (GPa);
- Fic
- compressive strengths of the pultruded GFRP material (MPa);
- Fij
- shear strength of the pultruded GFRP material (MPa);
- Fit
- tensile strengths of the pultruded GFRP material (MPa);
- G12, G13
- shear modulus in plane 12 or 13 (GPa);
- G23
- shear modulus in plane 23 (GPa);
- h1, h2, d1, d2
- specific dimension parameters of sealing plate (mm);
- IF
- the inverse of the Tsai–Wu strength ratio index (dimensionless);
- KBJ
- stiffness of the bottom joint (kN · m/rad);
- KBMG
- stiffness provided by bottom member group (kN · m/rad);
- KUJ
- stiffness of the upper joint (kN · m/rad);
- KUMG
- stiffness provided by upper member group (kN · m/rad);
- l1, l2, d3, d
- specific dimension parameters of bolt (mm);
- M
- bending moment applied on the ABCS (kN);
- P
- axial force applied on the ABCS (kN);
- R
- radius of solid ball of ABCS (mm);
- s1, s2, r
- specific dimension parameters of sleeve (mm);
- v12, v13
- Poisson's ratio in plane 12 or 13 (dimensionless);
- v23
- Poisson's ratio in plane 23 (dimensionless);
- σi
- the principle stresses (MPa); and
- τij
- the shear stresses (MPa).
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Published In
Journal of Composites for Construction
Volume 24 • Issue 6 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jan 16, 2020
Accepted: Jun 17, 2020
Published online: Aug 18, 2020
Published in print: Dec 1, 2020
Discussion open until: Jan 18, 2021
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