ReinforCE 1.2: Truss Challenge represented the hands-on fabrication milestone under the ReinforCE 1.0 intra series organized by the American Concrete Institute (ACI) Student Chapter at KUET. While Mechanics Mania tested abstract calculations, the Truss Challenge placed real physical materials into students' hands, forcing them to confront the unforgiving realities of timber grain direction, gusset joint eccentricities, out-of-plane lateral buckling, and glue shear strength.
Clear support span: 600 mm. Maximum bridge height: 160 mm. Minimum deck clearance: 80 mm for vehicular simulator transit.
Maximum bridge self-weight: 55 grams. Excess weight penalized exponentially on the structural efficiency calculation.
Uniform cross-section balsa wood strips (\(3\,\text{mm} \times 3\,\text{mm}\)) and standard cyanoacrylate / PVA wood adhesive. No composite reinforcement allowed.
The competition culminated in a public testing session inside the KUET Department of Civil Engineering Concrete & Structures Laboratory. Each fabricated bridge was precisely weighed on a 0.01g electronic laboratory balance, rested upon calibrated steel knife-edge supports, and fitted with a central loading block.
A calibrated hydraulic load actuator applied monotonic downward displacement. Real-time load values were projected on live digital monitors as students and faculty watched tension members stretch, compression chords undergo Euler buckling, and joints explode at peak failure load (\(P_{\text{ult}}\)).
Top-performing structures achieved efficiency ratios exceeding 800× their own weight!
Supervised by departmental laboratory technical staff and Chapter Moderator Prof. Dr. Abu Zakir Morshed, the Truss Challenge served as an indispensable masterclass in structural detailing, teaching students that joint workmanship and symmetric alignment dictate real-world load survival far more than theoretical ideals.