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Ground-borne vibrations induced by impact pile driving: experimental assessment and mitigation measures

Earthquake Engineering and Engineering Vibration 2023年第1期22卷 105-115页

作者： A.Colaço A.M.Abouelmaty P.Alves Costa construct-feup University of PortoRua Dr.Roberto FriasPorto 4200-465Portugal Arab Academy for Science Technology&Maritime TransportCollege of Engineering and TechnologyAlexandriaEgypt

Impact pile driving is an interesting technique for the construction of deep foundations from a practical and economical point of view.However,the generalization of this technique can be restricted due to the excessive vibration levels that can be generated,which can be especially problematic in residential areas.However,different mitigation measures can be applied to prevent excessive vibration levels inside buildings located near construction sites.To compare its efficiency through a numerical prediction tool,two experimental test sites are first presented and characterized.From the results obtained,it was found that the construction of an open trench near the impact source can be used as an efficient mitigation measure to reduce the maximum vibration levels evaluated in this study.

关键词： impact pile driving ground-borne vibrations experimental and numerical analysis mitigation measures

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Prediction of ground-borne vibration induced by impact pile driving:numerical approach and experimental validation

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Earthquake Engineering and Engineering Vibration 2023年第4期22卷 921-935页

作者： A.Colaço P.Alves Costa C.Ferreira C.Parente J.Fernandez-Ruiz construct-feup University of PortoRua Dr.Roberto Frias4200-465 PortoPortugal University of La Coruña Department of Civil EngineeringCampus de Elviña 15071La CoruñaSpain

Deep foundations are currently used in engineering practice to solve problems caused by weak geotechnical characteristics of the ground.Impact pile driving is an interesting and viable solution from economic and technical points of view.However,it is necessary to ensure that the environmental drawbacks,namely ground-borne vibration,are adequately met.For this purpose,the authors propose an axisymmetric finite element method-perfectly matched layer(FEM-PML)approach,where the nonlinear behavior of the soil is addressed through an equivalent linear methodology.Given the complexity of the problem,an experimental test site was developed and fully characterized.The experimental work comprised in-situ and laboratory soil characterization,as well as the measurement of vibrations induced during pile driving.The comparison between experimental and numerical results demonstrated a very good agreement,from which it can be concluded that the proposed numerical approach is suitable for the prediction of vibrations induced by impact pile driving.The experimental database is available as supplemental data and may be used by other researchers in the validation of their prediction models.

关键词： pile driving ground-borne vibrations numerical modeling experimental validation

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A road map to find in 3D printing a new design plasticity for construction e The state of art

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Frontiers of Architectural Research 2023年第2期12卷 337-360页

作者： João Teixeira Cecília Ogliari Schaefer Bárbara Rangel Lino Maia Jorge Lino Alves construct Faculty of Engineering(FEUP)University of PortoPortoPortugal School of Arts Communication and HospitalityArchitecture and UrbanismUniversity of the ItajaíValleyItajaíBrazil Faculty of Architecture University of PortoPortoPortugal Faculty of Exact Sciences and Engineering University of MadeiraPortoPortugal INEGI/Faculty of Engineering University of Porto PortoPortugal

Recent years are showing a rapid adoption of digital manufacturing techniques to the construction industry,with a focus on additive manufacturing.Although 3D printing for construction(3DPC)has notably advanced in recent years,publications on the subject are recent and date a growth in 2019,indicating that it is a promising technology as it enables greater efficiency with fair consumption of material,minimization of waste generation,encouraging the construction industrialization and enhancing and accelerating the constructive process.This new building system not only gives an optimization of the building process but provides a new approach to the building design materiality.The direct connection between design and manufacturing allows the reduction in the number of the various construction phases needed.It is opening a new and wide range of options both formal and chromatic in customization,avoiding complex formworks,reducing costs and manufacturing time.The creative process has a strict and direct link with the constructive process,straightening design with its materiality.Cement-based materials lead the way,but new alternatives are being explored to further reduce its carbon footprint.In order to leverage its sustainability and enhance the system capacity,initiatives are being pursued to allow the reduction of the use of PC.Geopolimers are taking the first steps in 3DPC.construction and Demolition Waste(CDW)materials are used to substitute natural aggregates.Even soil is being explored has a structural and aesthetic material.These research trends are opening a wider range of possibilities for architecture and design,broadening the spectrum of color,texture,and formal variations.The concern about textures and colours is not yet evident in many the structures already printed,opening the opportunity for future research.More can be done in the mixture and formal design of this building system,“discovering”other raw materials in others waste.This article aims to make a critical review of technologies,materials and me

关键词： 3D printing Architecture construction Materials development Textures

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Seismic fragility assessment of revised MRT buildings considering typical construction changes

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Frontiers of Structural and Civil Engineering 2020年第1期14卷 241-266页

作者： Rakesh DUMARU Hugo RODRIGUES Humberto VARUM construct-LESE Faculty of Engineering(FEUP)University of PortoPorto 4200-465Portugal RISCO School of Technology and ManagementPolytechnic Institute of LeiriaLeiria 2411-901Portugal

The present study investigates the vulnerability assessment of the prototype revised Mandatory Rule of Thumb(MRT)buildings initially designed and detailed for three storeys bare frame building;later modified through variable number of storeys(three,four,and five)and different arrangement of infill walls(bare frame,soft-storey,irregular infilled,and fully infilled).The application of infill walls increases the fundamental frequencies,stiffness,and maximum strength capacity,but reduces the deformation capability than the bare frame building.The vulnerability was also reduced through infill walls,where the probability of exceeding partial-collapse and collapse damage reduced by 80% and 50%,respectively.Furthermore,the increased in storeys(three to five)also increases the failure probability,such that partial-collapse and collapse for fully infilled increases by almost 55% and 80%,respectively.All obtained results and discussions concluded that the structural sections and details assigned for MRT building is not sufficient if considered as bare frame and soft-storey.And increase in number of storeys causes building highly vulnerable although the infill walls were considered.

关键词： mid-rise buildings revised NBC 205:2012 masonry infill walls configurations of infill walls vulnerability assessment and inter-storey drift

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Seismic safety assessment of existing masonry infill structures in Nepal

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Earthquake Engineering and Engineering Vibration 2016年第2期15卷 251-268页

作者： Hemchandra Chaulagain Hugo Rodrigues Enrico Spacone Humberto Varum Civil Engineering Department University of Aveiro RISCO School of Technology and ManagementPolytechnic Institute of Leiria University of Chieti-Pescara Department PRICOS–Architettura construct-LESE Faculty of Engineering (FEUP)University of Porto

Reinforced concrete（RC） buildings in Nepal are constructed with RC frames and masonry infill panels. These structures exhibit a highly non-linear inelastic behavior resulting from the interaction between the panels and frames. This paper presents an extensive case study of existing RC buildings in Nepal. Non-linear analyses were performed on structural models of the buildings considered as a bare frame and with masonry infill, in order to evaluate the influence of infill walls on the failure mechanisms. Five three-storey buildings with different structural configurations and detailing were selected. The effect of masonry infill panels on structural response was delineated by comparing the bare-framed response with the infill response. Seismic performance is evaluated with regard to global strength, stiffness, energy dissipation, inter-storey drift, and total deflection of the structure. A parametric analysis of structures with masonry infill is also performed. For this, the influence of different material properties is studied, namely diagonal compressive stress, modulus of elasticity and tensile stress of masonry infill panels. Study results show that masonry infill increases the global strength and stiffness of the structures; it decreases the inter-storey drift and hence the total displacement of the structure. The results quantify the influence of the infill panels on structural response and, in particular, the effect of the diagonal compressive strength of the masonry wall.

关键词： frames diagonal panels compressive drift hence quantify tensile stiffness rotation

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