Seismic Performance Assessment of Monolithic 3D-Printed Housing Units Through Full-Scale Shake Table Testing
Over the past decade, additive manufacturing has significantly transformed the construction industry, enabling the rapid development of 3D printing systems for building applications worldwide. Despite technological progress and increasing industry adoption, limited research has addressed the seismic behaviour of monolithic 3D-printed structures. This gap presents a critical challenge, particularly for regions exposed to seismic hazards. The present study responds to this need by conducting a systematic experimental investigation into the structural and dynamic performance of a full-scale 3D-printed housing unit, aiming to establish foundational knowledge and contribute to seismic design guidance for this emerging construction technology.
Mechanical Characterisation of 3D-Printed Materials
The research begins with an extensive mechanical characterisation of the printed material to understand its structural properties and anisotropic behaviour. Preliminary experimental tests, including diagonal shear tests on 3D-printed wall specimens, were conducted to evaluate strength, stiffness, and failure mechanisms. These tests provide essential data for understanding layer-to-layer bonding performance and in-plane shear resistance, which are critical for seismic applications. The outcomes form the empirical basis for subsequent numerical modelling and structural assessment.
Numerical Model Development and Calibration
A calibrated numerical model was developed to simulate the seismic response of the 3D-printed housing unit. Using data obtained from the preliminary material tests, the model integrates mechanical properties and boundary conditions representative of the experimental configuration. Calibration ensured that the simulated structural behaviour accurately reflected expected nonlinear and dynamic responses. This modelling stage was fundamental in predicting performance under seismic loading and in informing the structural design of the full-scale prototype.
Design and Construction of the Full-Scale 3D-Printed Unit
The study includes the design and dimensioning of a full-scale 3D-printed housing unit measuring 3 m × 4 m. Special attention was given to structural detailing, load paths, and connection systems between the printed unit and the shake table apparatus. The housing unit was printed directly on the shake table at the SOFSI Lab, University of Bristol, ensuring realistic boundary conditions during dynamic testing. Instrumentation and sensor placement were carefully integrated to capture displacement, acceleration, and strain responses throughout the experiment.
Full-Scale Shake Table Testing and Experimental Validation
The core of the investigation involved conducting a full-scale seismic shake table test on the monolithic 3D-printed housing unit, representing, to the authors’ knowledge, the first experiment of its kind. The dynamic testing phase evaluated structural integrity, crack propagation, stiffness degradation, and overall seismic resilience. The collected data provided direct insight into the structural behaviour under simulated earthquake loading, enabling validation and refinement of the previously developed numerical model.
Implications for Seismic Design Guidelines and Risk Mitigation
Based on the combined experimental and numerical findings, the study highlights the potential for developing preliminary seismic design guidelines tailored to monolithic 3D-printed construction. The results contribute to improved seismic risk mitigation strategies and support engineers, researchers, and industry stakeholders in adopting additive manufacturing technologies safely. As part of the SAFE 3D PRINTED-CS project under HORIZON-INFRA-2021-SERV-01-07, this research advances the scientific foundation necessary for integrating 3D printing into resilient and technologically advanced.
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