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The advent of additive manufacturing (AM) processes applied to the fabrication of structural components creates the need for design methodologies supporting structural optimization approaches that take into account the specific characteristics of the process. While AM processes enable unprecedented geometrical design freedom, which can result in significant reductions of component weight, on the other hand they have implications in the fatigue and fracture strength due to residual stresses and microstructural features. This is linked to stress concentration effects and anisotropy that still warrant further research. This Special Issue of Applied Sciences brings together papers investigating the features of AM processes relevant to the mechanical behavior of AM structural components, particularly, but not exclusively, from the viewpoints of fatigue and fracture behavior. Although the focus of the issue is on AM problems related to fatigue and fracture, articles dealing with other manufacturing processes with related problems are also be included.

milling process --- part functionality --- surface integrity --- research progress --- non-proportional mixed mode loading --- fractography --- mode II stress intensity factor --- finite element analysis --- rail steel --- wheel steel --- monolithic zirconia crown --- dental implant abutment --- cyclic loading --- mode III stress intensity factor --- FEA --- adaptive control --- fatigue testing --- simply supported bending --- mini specimen --- additive manufacturing --- 304L stainless steel --- LCF --- crack propagation --- blade-disc-Franc3D --- mixed-mode cracking --- fatigue life improvement --- materials characterization --- ultrasonic impact treatment --- DMLS --- fatigue --- fracture --- finite element method (FEM)

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Exceptional design loads on buildings and structures may have different causes, including high-strain natural hazards, man-made attacks and accidents, and extreme operational conditions. All of these aspects can be critical for specific structural typologies and/or materials that are particularly sensitive. Dedicated and refined methods are thus required for design, analysis, and maintenance under structures’ expected lifetimes. Major challenges are related to the structural typology and material properties. Further issues are related to the need for the mitigation or retrofitting of existing structures, or from the optimal and safe design of innovative materials/systems. Finally, in some cases, no design recommendations are available, and thus experimental investigations can have a key role in the overall process. For this SI, we have invited scientists to focus on the recent advancements and trends in the sustainable design of high-performance buildings and structures. Special attention has been given to materials and systems, but also to buildings and infrastructures that can be subjected to extreme design loads. This can be the case of exceptional natural events or unfavorable ambient conditions. The assessment of hazard and risk associated with structures and civil infrastructure systems is important for the preservation and protection of built environments. New procedures, methods, and more precise rules for safety design and the protection of sustainable structures are, however, needed.

analytical model --- ductile walls --- shear strength --- capacity reduction --- Eurocode 8 --- concrete --- stainless steel --- reinforcement --- temperature --- thermal expansion --- waste management --- construction demolition waste --- thermochromic --- green building material --- recycled waste material --- corrosion --- deterioration --- stirrup --- beams --- cement-based composites (CBCs) --- compressive strength --- fire exposure --- thermal boundaries --- finite element (FE) numerical modelling --- empirical formulations --- fly ash --- granulated blast-furnace slag --- palm oil fly ash --- ordinary Portland cement --- recycled ceramics --- green mortar --- alkali-activated mix design --- embodied energy --- CO2 emission --- assessment --- earthquake --- Zagreb --- case study --- cultural heritage --- seismic design --- structural glass --- q-factor --- engineering demand parameters (EDPs) --- finite element (FE) numerical models --- non-linear incremental dynamic analyses (IDA) --- cloud analysis --- linear regression --- composites --- timber --- CLT --- load-bearing glass --- friction --- FEM analysis --- beam–column joints --- shear capacity --- cyclic loading --- joint’s numerical modeling --- interior joint --- corner joint --- modified reinforcement technique (MRT) --- beam-column joint --- ferrocement --- crack --- ductility --- displacement --- reinforced concrete --- deep beam --- support vector regression --- metaheuristic optimization

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There are many regions worldwide which are susceptible to extreme loads such as earthquakes. These can cause loss of life and adverse impacts on civil infrastructures, the environment, and communities. A series of methods and measures have been used to mitigate the effects of these extreme loads. The adopted approaches and methods must enable civil structures to be resilient and sustainable. Therefore, to reduce damage and downtime in addition to protecting life and promoting safety, new resilient structure technologies must be proposed and developed. This special issue book focuses on methods of enhancing the sustainability and resilience of civil infrastructures in the event of extreme loads (e.g., earthquakes). This book contributes proposals of and theoretical, numerical, and experimental research on new and resilient civil structures and their structural performance under extreme loading events. These works will certainly play a significant role in promoting the application of new recoverable structures. Moreover, this book also introduces some case studies discussing the implementation of low-damage structural systems in buildings as well as articles on the development of design philosophies and performance criteria for resilient buildings and new sustainable communities.

artificial neural network --- corrosion --- mined-out region --- finite element --- column-top isolation --- pseudodynamic test --- seismic performance --- sustainability prediction --- shear performance --- nonlinear time-history analysis --- shaking table test --- civil infrastructures --- angle section --- seismic connection detail --- cyclic loading test --- extreme loads --- sudden column removal --- flow --- water supply networks --- displacement response spectrum --- cold-formed steel composite shear wall building --- mitigation --- probabilistic framework --- nonlinearity --- optimized section --- corporation --- GM selection --- seismic damage --- natural hazards --- analysis --- spectrum variance --- viscous damper --- Great East Japan Earthquake --- OpenFresco --- Brazier flattening --- substructure --- damage --- model-based --- tapered cross section --- liquefaction --- measurement --- NDE --- settlement --- seismic behavior --- resilience --- hybrid damper --- numerical simulation --- structural response estimates --- probabilistic --- energy-based approximate analysis --- damping effect --- cold-formed steel structure --- silt --- ground motion --- boundary technique --- energy dissipative devices --- reinforced concrete --- cyclic reversal test --- ground improvement --- simplified modeling method --- beam --- girder --- integration algorithm --- force-displacement control --- reinforced concrete frames --- mid-rise --- intermediate column --- time-frequency energy distribution --- single-layer reticulated dome --- structural robustness --- precast slab --- chloride ingress --- dynamic model --- Brazier effect --- earthquake --- sustainability --- carbonation --- replaceable coupling beam --- railway construction --- concrete --- variational method --- shear wall --- progressive collapse --- abnormal loads --- recovery --- earthquakes --- resilience-based design --- disaster --- OpenSees --- seismic analysis --- response surface method --- subway station --- ratcheting effect --- matching pursuit decomposition --- hybrid simulation --- subway induced vibration --- dynamic structural analysis --- numerical simulations --- structural sensitivity --- inflection point --- system restoration --- infinite element boundary --- simulation model --- Monte Carlo simulation --- nonlinear response

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Engineering practice has revealed that innovative technologies’ structural applications require new design concepts related to developing materials with mechanical properties tailored for construction purposes. This would allow the efficient use of engineering materials. The efficiency can be understood in a simplified and heuristic manner as the optimization of performance and the proper combination of structural components, leading to the consumption of the least amount of natural resources. The solution to the eco-optimization problem, based on the adequate characterization of the materials, will enable implementing environmentally friendly engineering principles when the efficient use of advanced materials guarantees the required structural safety. Identifying fundamental relationships between the structure of advanced composites and their physical properties is the focus of this book. The collected articles explore the development of sustainable composites with valorized manufacturability corresponding to Industrial Revolution 4.0 ideology. The publications, amongst others, reveal that the application of nano-particles improves the mechanical performance of composite materials; heat-resistant aluminium composites ensure the safety of overhead power transmission lines; chemical additives can detect the impact of temperature on concrete structures. This book demonstrates that construction materials’ choice has considerable room for improvement from a scientific viewpoint, following heuristic approaches.

steel fiber reinforced concrete (SFRC) --- slender beams --- cyclic loading --- hysteretic response --- failure mode --- tests --- aluminum honeycomb --- deformation modes --- shock wave --- counter-intuitive behavior --- energy distribution --- acoustic stealth --- acoustic coating --- passive sound absorption --- active sound absorption --- acoustic characteristics of a submarine --- finite element method (FEM) --- slip --- group studs --- composite beam --- accelerated bridge construction --- steel fiber --- in situ amorphous coating --- laser surface remelting --- Ti-based alloy --- pipeline steel --- toughness --- cleavage unit --- crack propagation --- misorientation angles --- CFRP laminate --- mechanically fastened joints --- gradient material model --- dissimilar welding materials --- electron-beam welding --- fracture morphology --- fracture toughness --- crack deflection --- three-point bending test --- irreversible thermochromic --- cement composite --- manganese violet --- temperature indication --- heat monitoring --- cold-formed profiles --- high-strength steel --- local deformations --- bending test --- load-bearing capacity --- FRP --- concrete --- damage --- synergy --- strengthening --- finite element analysis --- composite material --- tribology --- vibrations --- resonance zone --- aluminum alloys --- composite materials --- epoxy resins --- power cables --- transmission lines --- CFRP --- NSM --- bond behavior --- structural behavior --- material characterization --- numerical modeling --- reinforced concrete --- steel fiber-reinforced concrete (SFRC) --- tension softening --- tension stiffening --- finite element (FE) analysis --- smeared crack model --- constitutive analysis --- residual stresses --- flexural behavior --- numerical analysis --- cyclic tests --- direct tension tests --- residual stiffness --- shear --- flexure --- shape memory alloys --- thermal environment --- composite laminates --- sound radiation --- 3D warp interlock fabric --- warp yarn interchange ratio --- mechanical test --- mechanical characterization --- fiber-reinforced composite --- soft body armor --- para-aramid fiber --- metal matrix composites --- SiC --- AZ91 --- magnesium alloy --- Cu-Cr system --- mechanical alloying --- solid solubility extension --- structural evolution --- thermodynamic --- n/a

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With rapid developments being made in the exploration of marine resources, coastal geohazard and offshore geotechnics have attracted a great deal of attention from coastal geotechnical engineers, with significant progress being made in recent years. Due to the complicated nature of marine environmnets, there are numerous natural marine geohazard preset throughout the world’s marine areas, e.g., the South China Sea. In addition, damage to offshore infrastructure (e.g., monopiles, bridge piers, etc.) and their supporting installations (pipelines, power transmission cables, etc.) has occurred in the last decades. A better understanding of the fundamental mechanisms and soil behavior of the seabed in marine environments will help engineers in the design and planning processes of coastal geotechnical engineering projects. The purpose of this book is to present the recent advances made in the field of coastal geohazards and offshore geotechnics. The book will provide researchers with information reagrding the recent developments in the field, and possible future developments. The book is composed of eighteen papers, covering three main themes: (1) the mechanisms of fluid–seabed interactions and the instability associated with seabeds when they are under dynamic loading (papers 1–5); (2) evaluation of the stability of marine infrastructure, including pipelines (papers 6–8), piled foundation and bridge piers (papers 9–12), submarine tunnels (paper 13), and other supported foundations (paper 14); and (3) coastal geohazards, including submarine landslides and slope stability (papers 15–16) and other geohazard issues (papers 17–18). The editors hope that this book will functoin as a guide for researchers, scientists, and scholars, as well as practitioners of coastal and offshore engineering.

wave motion --- offshore deposits --- seabed response --- FEM --- pore pressure --- wave-current-seabed interaction --- RANS equations --- k-ε model --- current velocity --- seabed liquefaction --- liquefaction --- lateral displacement --- response surface method (RSM) --- artificial neural network (ANN) --- wave action --- silty sand --- seepage flow --- soil erosion --- pore-pressure accumulation --- three-phase soil model --- immersed tunnel --- trench --- numerical study --- porous seabed --- pumping well test --- groundwater fluctuation --- stratum deformation --- micro-confined aquifer --- wave–current–seabed interaction --- Reynolds-Averaged Navier-Stokesequations --- buried pipeline --- k-ε turbulence model --- oscillatory liquefaction --- wave-soil-pipeline interactions --- meshfree model --- local radial basis functions collocation method --- hydrate-bearing sediments --- damage statistical constitutive model --- multi-field coupling --- wellbore stability --- bridge scour --- identification --- ambient vibration --- field application --- natural frequency --- mode shape --- superstructure --- cable-stayed bridge --- Principal stress rotation --- dynamic loading --- wave (current)-induced soil response --- open-ended pile --- soil plug --- offshore wind turbines --- lateral cyclic loading --- model test --- discrete element simulation --- rock-socketed piles --- monopiles --- impedances --- dynamic responses --- buoyancy --- bottom-supported foundation --- field test --- numerical analysis --- giant submarine landslides --- shelf break --- South China Sea --- Himalayan orogeny --- repeated submarine landslides --- coastal-embankment slope --- stability --- unsaturated soil --- multilayered --- matric suction --- random searching algorithm --- rainfall infiltration --- scour --- soft clay --- monopile --- stress history --- hypoplastic model --- submarine pipeline --- dense seabed foundation --- seismic dynamics --- resonance of submarine pipeline --- FSSI-CAS 2D --- n/a