Advancing mix design prediction in 3D printed concrete: Predicting anisotropic compressive strength and slump flow

Case Studies in Construction Materials, Journal Year: 2024, Volume and Issue: 21, P. e03510 - e03510

Published: July 11, 2024

Introducing 3D-concrete printing has started a revolution in the construction industry, presenting unique opportunities alongside undeniable challenges. Among these, major challenge is iterative process associated with mix design formulation, which results significant material and time consumption. This research uses machine learning (ML) techniques such as Extreme Gradient Boosting (XGBoost), Support Vector Machine (SVM), Decision Tree Regression (DTR), Gaussian Process (GPR), Artificial Neural Network (ANN) to overcome these A dataset containing 21 constituent features 4 output properties (cast printed compressive strength, slump flow) was extracted from literature investigate relationship between performance. The models were assessed using range of evaluation metrics, including Mean Absolute Error (MAE), Root Squared (RMSE), (MSE), R-squared value. (GPR) yielded more favorable results. In case cast GPR achieved an R2 value 0.9069, along RMSE, MSE, MAE values 13.04, 170.12, 9.40, respectively. similar trend observed for strengths directions 1, 2, 3. exceeding 0.91 all directions, accompanied by significantly lower RMSE (below 4.1). also validated four designs. These mixes 3D tested strength flow. GPR's average error 10.55 %, while SVM slightly 9.38 %. Overall, this work presents novel approach optimizing 3D-printed concrete enabling prediction flow directly design. can facilitate fabrication structures that fulfill necessary printability requirements.

Language: Английский

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Advances in the structural performance of reinforced concrete flat plate-column connections under gravity and seismic loads

Journal of Building Pathology and Rehabilitation, Journal Year: 2025, Volume and Issue: 10(1)

Published: Jan. 26, 2025

Language: Английский

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Enhancing the Seismic Response of Residential RC Buildings with an Innovative Base Isolation Technique

Sustainability, Journal Year: 2023, Volume and Issue: 15(15), P. 11624 - 11624

Published: July 27, 2023

The prediction of the magnitude and impact forthcoming earthquakes remains an elusive challenge in field science. Consequently, extensive research efforts have been directed toward development earthquake-resistant design strategies aimed at mitigating building vibrations. This study focuses on efficacy fluid viscous dampers (FVDs) augmenting seismic response a low-rise residential reinforced-concrete building, which is base-isolated, using high–damping rubber bearings (HDRBs). structural analysis employs non-linear approach, employing ETABS v16 software for modeling conducting dynamic artificial accelerograms specific to Algeria. Three distinct connection configurations building’s base are investigated: (1) fixed-base structure; (2) structure isolated by HDRBs; (3) utilizing novel parallel arrangement HDRBs conjunction with FVDs. Comparative evaluation these reveals noteworthy findings; results demonstrate that isolation system, comprising FVDs, significantly diminishes shear force over 80% reduces acceleration 54% while concurrently increasing displacement 47%. These findings underscore effectiveness incorporating FVDs as means enhance reinforced concrete buildings. showcases potential such analyses contribute approaches, providing valuable insights architects engineers involved constructing resilient buildings seismically active regions.

Language: Английский

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Advancing seismic resilience: Performance-based assessment of mid-rise and high-rise engineered cementitious composite (ECC) Buildings

Case Studies in Construction Materials, Journal Year: 2023, Volume and Issue: 20, P. e02732 - e02732

Published: Dec. 1, 2023

Engineering Cementitious Composites (ECC) have received wide attention in recent years due to their enhanced mechanical properties and ductility. These offer an opportunity design structures with significantly improved seismic performance having a low-damage ductile response. However, existing research studies primarily focus on the of ECC at material member scales, resulting knowledge gap regarding its response structural level. This study examines system-level buildings designed using compares those conventional reinforced concrete (RC) members. For this purpose, two RC shear wall (7-story 24-story) were selected as case study, elements separately (for combined gravity lateral loads) guidelines recommended by Japan Society Civil (JSCE) ACI (American Concrete Institute)-318-19. The results show that requirement longitudinal steel is reduced maximum 24% flexural members 15% compression members, addition significant reduction required transverse reinforcement compared corresponding Similarly, owing tensile behavior, also exhibited higher capacity than detailed nonlinear finite element models both cases i.e., RC) subjected monotonic reversed-cyclic pushover analysis, time history analyses (NLTHA) under set ground motions. It was observed capacity, revered-cyclic response, overall structures. demonstrate can be effectively used various for buildings.

Language: Английский

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Seismic Performance Assessment of Steel Buildings Equipped with a New Semi-active Displacement-Dependent Viscous Damper

Journal of Earthquake and Tsunami, Journal Year: 2024, Volume and Issue: 18(06)

Published: June 30, 2024

This paper investigates numerically the seismic behavior of multi-degree-of-freedom (MDOF) systems with novel 2–4 direction and displacement-dependent (2–4DDD) Displacement-Velocity- (2–4DVD) Semi-Active (SA) controls. study builds upon SA 2–4DDD control system, in which damper forces are controlled by inter-story drifts. For first time, this an MDOF system A 3-story steel frame is modeled OpenSees then subjected to real earthquake records. The considering three systems: (i) conventional passive nonlinear viscous dampers (NVDs), (ii) dampers, (iii) a new 2–4DVD damper. Parametric studies conducted determine optimal parameters designed frames. New design methodologies for controls also proposed. results discussed terms drift, base shear force, acceleration, dissipated energy required force. Results from Nonlinear Time History Analyses show that, compared traditional NVDs, drifts up 72% 32% lower, respectively. reduces damping acceleration 60% 87%, respectively, control. It shown that was not stable high-frequency Conversely, leads smoother force changes between quadrants case investigated paper. contributes toward development retrofitting systems.

Language: Английский

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Unlocking Resilience: Examining the Influence of Fluid Viscous Dampers on Seismic Performance of Reinforced-concrete Structures in Earthquake-prone Regions

Periodica Polytechnica Civil Engineering, Journal Year: 2024, Volume and Issue: 68(4)

Published: July 25, 2024

In high seismicity regions like Algeria, the seismic performance of structures is paramount importance. This study investigates effectiveness fluid viscous dampers (FVDs) in enhancing resilience a 12-story (G+12) reinforced concrete structure. By utilizing Etabs and SeismoSoft softwares, comparative analysis conducted between two structural configurations: one with traditional fixed base another incorporating dampers. The incorporation FVDs aims to mitigate impact by dissipating energy, thereby reducing shear, displacement, acceleration during events. structure's location zone necessitates robust design strategies ensure safety integrity. paper presents comprehensive response advanced simulation framework providing detailed results on key parameters. findings highlight potential significantly improve structures, offering promising solution for earthquake-prone areas.

Language: Английский

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A comprehensive study of viscous damper configurations and vertical damping coefficient distributions for enhanced performance in reinforced concrete structures

Asian Journal of Civil Engineering, Journal Year: 2023, Volume and Issue: unknown

Published: July 20, 2023

Language: Английский

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Enhancing Seismic Resilience of Steel Structure Using Linear and Nonlinear Viscous Dampers

Published: May 8, 2024

This study examines the effectiveness of viscous fluid dampers in dynamic response a steel structure subjected to Kobe earthquake. The is equipped with diagonal on each floor, exhibiting both non-linear and linear behavior. By varying non-linearity dampers, aims assess their impact reducing structure's response. results show that characterized by parameter 0.8, outperform terms reduction, for equal damping coefficient stiffness. In addition, proposes simplified procedure determining required achieve an efficiency similar dampers. research highlights importance selecting appropriate optimizing parameters improve resilience structures event seismic events.

Language: Английский

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Seismic evaluation of non-seismically detailed RC buildings in Pakistan: performance and damage accumulation under repeated earthquakes

Bulletin of Earthquake Engineering, Journal Year: 2024, Volume and Issue: 22(9), P. 4547 - 4579

Published: May 30, 2024

Language: Английский

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Future-Proofing the Existing Building Stock: A Multi-Hazard Scenario for the Lombardy Region

Lecture notes in civil engineering, Journal Year: 2024, Volume and Issue: unknown, P. 390 - 406

Published: Oct. 26, 2024

Language: Английский

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