Investigating the efficacy of screwed coiled strap in t-connections for bambusa blumeana/ Jonabhel C. Gallardo, Johanna Mae C. Guno, Joy B. Patricio, Darwin C. Ramos, and Alexandra T. Sta. Catalina.--

Bachelor's thesis

College of Engineering.-- Bachelor of science in civil engineering: Technological University of the Philippines, 2024.

Includes bibliographic references and index.

This study explores the optimization of bamboo T-connections for structural
applications, focusing on Bambusa blumeana, abundant in the Philippines. T-connections
are critical in bamboo structures, yet their performance remains under-researched. The
study evaluates screws and coiled straps as alternatives, challenging the assumption that
screws behave like nails, which often induce tangential stress and splitting. Experimental
methods (ISO standards) and finite element analysis (FEA) via Ansys were used to assess
stress distribution, tensile strength, failure modes, and performance. Results showed that a
4 mm screw with a 1.4 mm coiled strap achieved the highest tensile strength (20.398 kN),
while a 5 mm screw and 2 mm strap achieved 17.799 kN. Failure modes included screw
failure, withdrawal, and bamboo splitting. All designs met load-bearing ductility
requirements (μ > 1.25), making them viable for low-rise structures. FEA results aligned
with experiments, validating the designs and revealing stress distribution patterns. The
findings highlight screws and coiled straps as promising alternatives for enhancing bamboo
T-connection integrity, advancing sustainable construction. Future research should address
long-term performance under varied conditions to further promote bamboo’s eco-friendly
potential.