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Seismic control of vertically and horizontally irregular steel high-rise buildings by tuned mass dampers including SSI

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Asian Journal of Civil engineering 2024年第2期25卷 1995-2014页

作者： Kontoni, Denise-Penelope N. Farghaly, Ahmed Abdelraheem Department of Civil Engineering School of Engineering University of the Peloponnese Patras 26334 Greece School of Science and Technology Hellenic Open University Patras 26335 Greece Department of Civil and Architectural Constructions Faculty of Technology and Education Sohag University Sohag 82524 Egypt

The architectural requirements imposed on the structural design of buildings sometimes necessitate vertical and horizontal irregularities with their possibly dangerous effects when these structures are subjected to earthquakes. One of the greatest challenges in structural engineering is the design of a steel high-rise building (HRB) with vertical and horizontal irregularities. In this research, two irregular steel high-rise buildings (HRBs) were seismically analyzed as 3D models considering soil–structure interaction (SSI) and tuned mass damper (TMD) systems were used to mitigate their seismic response under different earthquakes. The two studied HRBs were a vertically irregular (step-pyramid-shaped) steel HRB, and a both vertically and horizontally irregular (L-shaped in-plan, stadium-shaped) steel HRB. The SSI provides the actual response of the tall buildings subjected to earthquake, and mitigation schemes using TMDs were suggested with arrangements of the TMDs on the top plan and along the elevation of the steel high-rise buildings to achieve seismic control of these structures. The present study has shown that the best efficiency in the mitigation of the effect of earthquakes on vertically and horizontally irregular steel high-rise buildings is obtained by implementing TMDs at the corners of the HRB plan on the top of the HRB and also at different floor levels along the upper half-height of the HRB. © 2023, The Author(s).

关键词： High-rise building (HRB) Irregular building Seismic response Soil–structure interaction (SSI) Steel structure Tuned mass damper (TMD) Vibration control

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Impact of flow direction on suffusion of sand-clay mixtures under variably saturated conditions

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岩石力学与岩土工程学报（英文版） 2025年第4期17卷 2511-2525页

作者： Yerim Yang Hangseok Choi Jooho Lee Yongjoon Choe Jongmuk Won School of Civil Environmental and Architectural EngineeringKorea UniversityAnam-dong 5 GaSeoul136-713South Korea School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlantaGA30332-0355USA Department of Civil UrbanEarthand Environmental EngineeringUlsan National Institute of Science and Technology(UNIST)UNIST-gil 50Ulju-gunUlsan44919South Korea

Suffusion is the process defined as the migration of relatively small soil particles through the pores of a soil matrix composed of relatively large particles,driven by substantial hydrodynamic forces and weak attraction *** study investigates the influence of flow direction(upward and downward)on suffusion induced by interaction energies in sand-clay mixtures under both saturated and unsaturated *** impact of clay mineralogy(kaolinite,illite,and montmorillonite),sand-grain size,and ionic concentration(IC)gradient were discussed based on the observed breakthrough curves(BTCs)and relative saturation rate(Sr)during injection(particularly for unsaturated conditions).Under saturated conditions,higher susceptibility to suffusion was observed in sand-kaolinite and sand-illite mixtures under downward flow compared to upward flow,whereas the suffusion of montmorillonite was more significant under upward flow than under downward *** contrast,for unsaturated conditions,more substantial suffusion of kaolinite and illite particles occurred under upward flow compared to downward flow,whereas the opposite trend was observed in sand-montmorillonite *** addition,the impact of sand-grain size(or the size ratio between sand and clay)on the suffusion of kaolinite and illite under unsaturated conditions suggests a reduced size ratio that leads to relatively significant suffusion under downward flow compared to upward *** findings presented in this study contribute to a comprehensive understanding of the influence of flow direction on suffusion in sand-clay mixtures under both saturated and unsaturated conditions.

关键词： Suffusion Breakthrough curve(BTC) Sand-clay mixture Saturated soil Unsaturated soil Ionic concentration(IC) Flow direction Clay mineralogy

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Assessing seismic mitigation schemes of tuned mass dampers for monopile offshore wind turbine including pile–soil–structure interaction

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Asian Journal of Civil engineering 2024年第2期25卷 1773-1799页

The study of a monopile offshore wind turbine with the soil–structure interaction effect is most challenging in structural design under multiple hazards, i.e., the combined wind, sea wave, and earthquake excitations. Different arrangements of passive tuned mass dampers (TMDs) were used to mitigate the service and seismic loads affecting an offshore wind turbine (OWT) including the pile–soil–structure interaction (PSSI) effect. Different schemes of passive TMDs, placed at the top of the OWT tower or also at the center of gravity (CG) of the OWT tower or at the connection between the OWT tower and monopile, were tested. Various arrangements of TMDs including the proposed herein top radial TMDs arrangements have been investigated to determine their validity in resisting vibrations resulting from service and earthquake loads. The lateral displacements, shear forces and bending moments in both horizontal directions and the axial forces all over the OWT tower and monopile heights were recorded to compare the performance of each mitigation scheme of TMDs. The comparison results showed that the TMDs placement should be at the top of the OWT tower and the top radial 6 TMDs arrangement was found to be the most effective mitigation scheme for all straining actions in the tower and the monopile of the OWT subjected to service and earthquake loads. © 2023, The Author(s).

关键词： Dynamic response Earthquake loads Monopile foundation Offshore wind turbine (OWT) Pile–soil–structure interaction (PSSI) Service loads Structural control Tuned mass damper (TMD) Vibration mitigation

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Performance Analysis of Multilayer Coil Based MI Waveguide Communication System

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Computers, Materials & Continua 2022年第9期72卷 5287-5300页

作者： Sandeep N.Dandu Vinay Kumar Joydeep Sengupta Neeraj D.Bokde Department of Electronics and Communications Engineering Visvesvaraya National Institute of TechnologyNagpur440010India Department of Electronics and Communications Engineering Motilal Nehru National Institute of TechnologyPrayagraj211002India Department of Civil and Architectural Engineering-Design and Construction 8000AarhusDenmark

In the non-conventional media like underwater and underground,the Radio Frequency(RF)communication technique does not perform well due to large antenna size requirement and high path *** such media,magnetic induction(MI)communication technique is very promising due to small coil size and constant channel *** the RF technique,the communication range in MI technique is relatively *** enhance this range,a waveguide technique is already brought in *** technique employs single layer coils to enhance the performance of MI *** further enhance the system functioning,in this paper,we investigated the performance of multi-layer coil(MLC)antenna based MI waveguide communication system in terms of transmission range,path loss,bit error rate(BER)and ***,the system performance is quantitatively evaluated in three different non-conventional media viz.,dry soil,fresh water and wet *** compared with the single layer counterpart,the MLC system shows a significant improvement in transmission range,BER even in loosely coupled scenarios and shows a corresponding reduction in path ***,the bandwidth is observed to be low(<1 KHz).In this analysis,the eddy current effects and parasitic capacitance are compared for single and multilayer *** is observed that the proposed system performs better in dry soil medium due to less medium conductivity.

关键词： Communication magnetic induction multilayer coil waveguide system

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Design and Assessment of a Grid-Connected Smart Building System: an Effort to Save Energy and Cost

Design and Assessment of a Grid-Connected Smart Building Sys...

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ASHRAE and SCANVAC HVAC Cold Climate Conference 2023

作者： Behzadi, Amirmohammad Sadrizadeh, Sasan The Department of Civil and Architectural Engineering KTH Royal Institute of Technology Stockholm Sweden

ISBN: (纸本)9781955516488

The present paper introduces a practical smart energy system centered around low-temperature heating and high-temperature cooling supplies for reduced input energy use and higher penetration of renewable sources. A low-temperature geothermal heat source drives the proposed system to supply the heating, cooling, and electricity demands of a residential building apartment in the Scandinavian climate. The system comprises a reversible heat pump, steam turbine, condenser, hot water tank, and heat exchangers. A rule-based control model with several controllers and smart valves is applied to mitigate the energy cost and shave the peak demand via bio-directional interaction with the electricity and heating networks. The parametric investigation and time-dependent simulation are carried out in TRNSYS software to assess the practicality of the suggested model. According to the results, the sizing selection through parametric optimization is highly important due to the conflictive variation of techno-economic indicators. As obtained by the parametric results, while a better performance condition is obtained by increasing the isentropic efficiency of the turbine, the cost saving will reduce, which is unfavorable. Moreover, the results show that the proposed smart system can autonomously provide the building's demands for most of the year thanks to the rule-based control strategy. Finally, the transient results reveal that the proposed smart system is more dependent on the energy network in cold seasons due to the increased heating needs in Sweden. © 2023 ASHRAE.

关键词： Computer software

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Mechanical properties and durability of recycled gold tail powder concrete

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Results in engineering 2025年 26卷

作者： Wang, Mingxin Zhao, Wenjie Xi, Hongyi Zhang, Teng Wang, Ziyi Department of Civil and Architectural Engineering Qingdao University of Technology China

Gold tailings powder (GTP) is an industrial waste that is difficult to dispose of, and its accumulation has increasingly severe environmental consequences. To address the environmental pollution caused by GTP, its recycling is of significant importance for emission reduction. Therefore, this study investigates the performance deterioration patterns of GTP-based concrete under varying replacement ratios (0 %, 10 %, 20 %, and 30 %) and water-cement ratios (0.42 and 0.38) by directly replacing cement with GTP to produce low-carbon green concrete. Initially, the activity index of GTP was determined through pozzolanic activity tests, and GTP-based concrete was fabricated by direct substitution. Subsequently, mechanical performance tests (compressive, tensile, and flexural strengths), freeze-thaw damage, and dry-wet cycle tests were conducted on GTP-based concrete specimens to explore their material properties and durability. The experimental results indicate that after 200 freeze-thaw cycles, the compressive strengths of GTP-based concrete specimens with replacement ratios of 0 %, 10 %, 20 %, and 30 % decreased by 30.7 %, 33.87 %, 31.26 %, and 40.73 %, respectively, compared to undamaged specimens. After 30, 50, and 70 dry-wet cycles, the compressive strengths of GTPC specimens decreased by 3.81 %, 3.68 %, and 11.51 %, respectively, while their tensile strengths decreased by 5.57 %, 2.88 %, and 8.42 %, respectively, compared to undamaged specimens. Finally, based on the experimental results, parameters in the compressive strength calculation formula for GTP-based concrete were revised. The revised formula can accurately predict the compressive strengths of specimens with different GTP replacement ratios. The research findings provide optimal mix design recommendations for the preparation of green low-carbon concrete, contributing to reduced environmental pollution. © 2025

关键词： Compressive strength

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Seismic control of T-shape in plan steel high-rise buildings with SSI effect using tuned mass dampers

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Asian Journal of Civil engineering 2024年第2期25卷 1725-1739页

A steel high-rise building (HRB) with plan irregularity is a major challenge in engineering design, especially under seismic loads. Soil–structure interaction (SSI) is one of the most important factors in designing steel high-rise structures. Herein, a T-shape in plan steel HRB subjected to four different earthquakes will mitigate the vibration and control the displacements and base straining actions resulting from earthquakes by using tuned mass dampers (TMDs) systems, and the most controlling arrangement of TMDs, in the fixed base HRB model and in the SSI HRB model, will be examined. Three-dimensional models of the steel high-rise building (HRB) with a T-shape in the plan subjected to four different earthquakes fixed or with the SSI effect were analyzed to investigate the seismic mitigation effect of six different plan arrangements of TMDs applied on the top plan of the fixed HRB model, while for the SSI HRB model, these TMDs distributions were applied on the top plan and additionally on two intermediate plans along the HRB height. The TMDs for the T-shape in plan steel HRB are more effective in the SSI model than in the fixed base model. In the SSI effect model, the distributions of the TMDs not only on the top plan of the model but also through the model (on two additional plan levels along the height) further reduced the HRB seismic response and this three-level TMDs distribution was required for the plan arrangement of 2 or 4 TMDs. © 2023, The Author(s).

关键词： High-rise building (HRB) Irregular building Seismic control Seismic response Soil–structure interaction (SSI) Steel structure Tuned mass damper (TMD)

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Key issues in water sealing performance of underground oil storage caverns: Advances and perspectives

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Journal of Rock Mechanics and Geotechnical engineering 2023年第10期15卷 2787-2802页

作者： Yutao Li Bin Zhang Lei Wang Yiguo Xue Hanxun Wang Lei Shi Zhenhua Peng Junyan Li School of Engineering and Technology China University of Geosciences(Beijing)Beijing100083China Department of Civil and Architectural Engineering and Construction Management University of CincinnatiCincinnatiOH45221USA CNOOC Petrochemical Engineering Co. Ltd.Qingdao266061China

Water sealing performance is important for underground water-sealed oil storage(UWSOS).The key issues concerning water sealing performance mainly include the permeability of fractured rock mass(FRM),water-sealed safety(WSS),water curtain performance,and prediction and control of water *** paper reviews the progress of above four key issues on water sealing ***,the permeability of an FRM is the basis of water sealing performance,and several commonly used permeability test methods and spatial variation characteristics of permeability are ***,the current water sealing criteria are compared,and the evaluation methods of WSS are ***,the design parameters and efficiency evaluation of water curtain systems(WCSs)are *** water inflow of oil storage caverns(OSCs)can reflect the water sealing effect,and the prediction methods and control measures of water inflow are also ***,the advantages and disadvantages of the current research are discussed,and the potential research directions are pointed out,such as optimization of water sealing criteria and FRM model,quantitative evaluation of WCS efficiency,accurate prediction of water inflow,and improvement of grouting technology.

关键词： Underground water-sealed oil storage (UWSOS) Water-sealed safety(WSS) Water curtain system(WCS) Water inflow Fractured rock mass permeability

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Feasibility of Using Natural Pozzolan-Limestone-Based Cement Composite for 3D Printing 12

Feasibility of Using Natural Pozzolan-Limestone-Based Cement...

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12th ACI/RILEM International Conference on Cementitious Materials and Alternative Binders for Sustainable Concrete, ICCM 2024

作者： Li, Haodao Addai-Nimoh, Alfred Khayat, Kamal H. The Department of Civil Architectural and Environmental Engineering Missouri University of Science and Technology RollaMO65401 United States Missouri University of Science and Technology United States

ISBN: (纸本)9781641952507

The emergence of 3D printing (3DP) technology in construction is limited by the overdependence on conventional Portland cement (PC). This is problematic in remote areas where procuring large quantities of raw materials requires sourcing from greater distances. Additionally, the rapid decline of coal combustion limits the availability of fly ash. This study aims to evaluate the feasibility of substituting high content (larger than 50%) of PC with natural pozzolans, including clay, pumice, and natural zeolite, as well as limestone filler that can be suitable for 3DP. The binder combinations were initially optimized to enhance packing density and robustness by evaluating the minimum water content and relative water demand of cement paste. A series of assessment methods, including slump flow loss test, rheological test, filtration test, axial deformation test, and unconfined uniaxial compression test, were carried out to determine the extrudability and shape stability of mortar made with the optimized binder candidates. Finally, the printability of these mixtures was validated using an extrusion-based 3D printer. © 2024 American Concrete Institute. All rights reserved.

关键词： Limestone

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Experimental and numerical evaluation on debonding of fully grouted rockbolt under pull‑out loading

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International Journal of Coal Science & technology 2022年第1期9卷 84-98页

作者： Shuisheng Yu Wancheng Zhu Leilei Niu Center for Rock Instability and Seismicity Research Department of Mining EngineeringSchool of Resource and Civil EngineeringNortheastern UniversityShenyang 110819China School of Architectural Engineering Zhongyuan University of TechnologyZhengzhou 450007China

The axial loading in rockbolts changes due to stress redistribution and rheology in the country rock *** a change may lead to debonding at rockbolt to grout interface or rupture of the *** this study,based on laboratory experiments,ultrasonic guided wave propagation in fully grouted rockbolt under different pull-out loads was investigated in order to examine the resultant debonding of *** signals obtained from the ultrasonic monitoring during the pull-out test were processed using wavelet multi-scale analysis and frequency spectrum analysis,the signal amplitude and the amplitude ratio(Q)of low frequency to high frequency were defined to quantify the debonding of *** addition to the laboratory test,numerical simulation on the effect of the embedment lengths on ultrasonic guided wave propagation in rockbolt was conducted by using a damage-based model,and the debonding between rockbolt and cement mortar was numerically *** was confirmed that the ultrasonic guided wave propagation in rockbolt was very sensitive to the debonding because of pull-out load,therefore,the critical bond length could be calculated based on the propagation of guided wave in the grouted *** time domain,the signal amplitude in rockbolt increased with pull-out load from 0 to 100 kN until the completely debonding,thus quantifying the debonding under the different pull-out *** the frequency domain,as the Q value increased,the debonding length of rockbolt decreased *** numerical results confirmed that the guided wave propagation in the fully grouted rockbolt was effective in detecting and quantifying the debonding of rockbolt under pull-out load.

关键词： Fully grouted rockbolt Debonding Pull-out load Ultrasonic guided wave propagation

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