Dissemination DeliverablesD6.2

Deliverable 6.2

Abstract

This deliverable illustrates the design, manufacturing and validation of the final demonstrator developed within the CIRCULAR WELD project, following the manufacturing and environmental impact assessment methodologies presented in Deliverable 5.3. The demonstrator consists of a lattice-based Crescent Shaped Brace (CSB) device, an energy-dissipation device for the seismic retrofitting of pinned steel frames, manufactured through Wire Arc Additive Manufacturing (WAAM) using ER70S-6 steel wire.

The demonstrator is designed based on the unit cells developed in Deliverable 4.2, following the design procedure presented in Deliverable 5.3 to satisfy multiple seismic design objectives.

The demonstrator is produced adopting process parameters and intersection deposition strategies selected on the basis of the experimental characterization previously conducted on single rods and intersecting rods, where different intersection deposition strategies were systematically investigated. The selected parameters were identified as those ensuring geometrical accuracy, printing quality, and reliable mechanical performance, enabling the production of the lattice-based WAAM CSB.

By applying the cradle-to-gate Life Cycle Assessment (LCA) methodology for DbD WAAM elements presented in Deliverable 5.3, this deliverable quantifies the carbon emissions associated with the production of the lattice-based demonstrator and compares them with those of the functionally equivalent full solid CSB designed to meet the same lateral stiffness requirements. The results provide a quantitative basis for evaluating the environmental performance of the WAAM-enabled lattice solution relative to its conventional counterpart, contributing to sustainability-oriented structural design.

Table of contents

1.   INTRODUCTION

2.   SEISMIC DESIGN AND EXPECTED PERFORMANCE OF THE DOT-BY-DOT WAAM LATTICE DEMONSTRATOR

3.   FABRICATION OF THE DOT-BY-DOT WAAM LATTICE DEMONSTRATOR

4.   ENVIRONMENTAL IMPACT