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30th International Conference on Computational and Experimental engineering and Sciences, ICCES 2024

作者： Yu, Zhongjun Fan, Boran Zhao, Xin Tongji Architectural Design Group No. 1230 Siping Road Shanghai200092 China Department of Structural Engineering Tongji University No. 1239 Siping Road Shanghai200092 China

ISBN: (纸本)9783031829062

The overall stability performance (Stiffness-to-Mass ratio) is a governing indicator in the structural design of super-tall buildings. For many super-tall buildings with extremely high aspect ratios, overall stability performance becomes a controlling constraint. In the design of super-tall buildings, the distribution of floor mass varies, ranging from relatively uniform to designs that taper from bottom to top, placing the center of gravity lower. With technological advancements, architects are pursuing unconventional designs, such as the CITIC Tower, which narrows and then expands from bottom to top. The height of the center of gravity is a key factor affecting the overall stability performance of high-rise buildings, with a lower center of gravity indicating better stability. The specific position of the center of gravity is determined by the distribution of floor mass along the building's height. Factors influencing the mass distribution of floors include the distribution of the building's plan area, changes in the dimensions of main structural components, and the distribution of other loads and non-structural component weights. Unlike the assumptions of standard codes, these super-tall buildings with very high aspect ratios have irregular mass distributions, which may meet the prescribed Stiffness-to-Mass ratio requirements of the codes, but not the modified Stiffness-to-Mass ratios. This paper reviews the relationship between overall stability analysis methods and Stiffness-to-Mass ratio, using a two-dimensional planar model to demonstrate the stability analysis methods, comparing results from Stiffness-to-Mass ratio analysis with those from finite element numerical simulations. For buildings with uneven vertical mass distribution, a modified algorithm is used to calculate the Stiffness-to-Mass ratio, and the results are compared with those unmodified. Finally, the second-order effects of gravity under inverted triangular loads, wind loads, and earthquake forc

关键词： Floors

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Electrical stimulation for brighter persistent luminescence

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Light(Science & Applications) 2024年第8期13卷 1590-1601页

作者： Xilin Ma Yuhua Wang Takatoshi Seto Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform CommissionDepartment of Materials ScienceSchool of Materials and EnergyLanzhou UniversityNo.222South Tianshui RoadLanzhouGansu 730000China

An immature understanding of the mechanisms of persistent luminescence(PersL)has hindered the development of new persistent luminescent materials(PersLMs)with increased *** this regard,in-situ direct current(DC)electric field measurements were conducted on a layered structure composed of the SrAl_(2)O_(4):Eu^(2+),Dy^(3+)phosphor,and an *** this study,the photoluminescence(PL)and afterglow properties were investigated with respect to voltage by analyzing the current signal and thermoluminescence(TL)*** intensity of PersL increased due to a novel phenomenon known as“external electric field stimulated enhancement of initial brightness of afterglow”.This dynamic process was illustrated via the use of a rate equation approach,where the electrons trapped by the ultra-shallow trap at 0.022 eV could be transferred through the conduction band during long *** afterglow intensity could reach 0.538 cdm^(-2)at a 6 V electric *** design of an electric field stimulation technique enables the enhancement of the intensity of PersLMs and provides a new perspective for exploring the fundamental mechanics of certain established PersLMs.

关键词： spectroscopy luminescence conduction

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Load-carrying capacity of MAG butt and fillet welded joints on high-strength structural steels of grade S960QL and S960MC

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ce/papers 2023年第3-4期6卷 587-594页

作者： Brätz, Oliver von Arnim, Mareike Eichler, Stefan Gericke, Andreas Henkel, Knuth-Michael Hildebrand, Jörg Bergmann, Jean Pierre Kuhlmann, Ulrike Fraunhofer IGP Rostock Germany University of Stuttgart Institute of Structural Design Stuttgart Germany Technische Universität Ilmenau Department of Mechanical Engineering Production Technology Group Ilmenau Ilmenau Germany

The use of high-strength structural steels brings great advantages in constructions regarding material requirements, weight reduction and productivity. Different steel grades within the S960 range are commercially available but not yet represented in Eurocode 3. The weldability of these steels is limited to smaller process windows to ensure the high material properties. In contrast to steels with moderate strength, there is a considerable risk of softening in the heat-affected zone causing a strength reduction of the connection. By now, the current EN 1993-1-12 only extends the design rules to cover steel grades up to S700. Therefore, the potential of these high-strength steels cannot be used to its full extent in structural engineering. This study, made within a steel application research project (FOSTA P 1507), deals with the weldability and load-carrying capacity of butt and fillet welded joints of S960QL and S960MC produced by gas-shielded metal arc welding. The influence of different bevel geometry, filler metal, and plate thicknesses was investigated. To extend the design rules up to S960, a need of an amendment was found for some combinations. © 2023 The Authors. Published by Ernst & Sohn GmbH.

关键词： High strength steel

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EXPERIMENTAL TESTING OF A DYNAMIC AMPLIFIER (DDA) ENHANCED PHONONIC METAMATERIAL ON LEGO® TECH-NIC DEVICE 29

EXPERIMENTAL TESTING OF A DYNAMIC AMPLIFIER (DDA) ENHANCED P...

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29th International Congress on Sound and Vibration, ICSV 2023

作者： Kalderon, Moris Mantakas, Antonis Chondrogiannis, Kyriakos Antoniadis, Ioannis School of Mechanical Engineering Department of Mechanical Design and Control Systems National Technical University of Athens Athens Greece School of Civil Engineering Institute of Structural Analysis and Antiseismic Research Department of Structural Engineering National Technical University of Athens Athens Greece Department of Civil Environmental and Geomatic Engineering ETH Zurich Zurich8093 Switzerland

ISBN: (纸本)9788011034238

In this study, a novel Dynamic Directional Amplifier, namely the DDA, is implemented in an experimental scaled phononic set-up that is constructed using LEGO® technical components. Experimental testing is undertaken as a feasibility assessment of the concept and results indicate the low-frequency wave attenuation properties of the structure. © 2023 Proceedings of the International Congress on Sound and Vibration. All rights reserved.

关键词： Metamaterials

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Impact of Pore Network Parameters on Hygric Properties of Porous Materials 18

Impact of Pore Network Parameters on Hygric Properties of Po...

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18th IBPSA Conference on Building Simulation, BS 2023

作者： Shi, Chengnan Soete, Jeroen Janssen, Hans KU Leuven Department of Civil Engineering Building Physics and Sustainable Design Leuven Belgium KU Leuven Department of Materials Engineering Structural Composites and Alloys Integrity and Nondestructive Testing Leuven Belgium

Hygric pore network modeling is a novel method to obtain the hygric properties of building materials. In order to study, verify and compare pore networks of these materials, a wide spectrum of parameters (both geometrical and topological) exists. This paper aims at a detailed examination of these parameters, with particular attention to their impact on moisture retention and moisture permeability. Pore networks of three porous materials are extracted, pre-processed, and lastly manually modified to change the target parameters. The modified pore networks are then used for the simulation of hygric properties. The results illustrate that moisture retention is most affected by both the radius and volume distribution of the pore elements. While for moisture permeability, the coordination number is the most crucial parameter. © 2023 *** rights reserved.

关键词： Porous materials

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A Comparative Analysis of Machine Learning Algorithms for Predicting Fundamental Periods in Reinforced Concrete Frame Buildings

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Iranian Journal of Science and Technology - Transactions of Civil engineering 2025年第3期49卷 2257-2276页

作者： Kumar, Pramod Gogineni, Abhilash Kumar, Amit Modi, Prakhar Department of Civil Engineering Mohan Babu University (SVEC) Andhra Pradesh Tirupati 517102 India Department of Civil Engineering National Institute of Technology Jamshedpur Jharkhand Jamshedpur 831013 India TPC Technical Projects Consultants Pvt Ltd. Structural Design Engineer Noida India Department of Civil Engineering Guru Ghasidas Vishwavidyalaya Chhattisgarh Bilaspur 495009 India

Determining the fundamental period is a critical aspect of the analysis and design of structures. Existing literature formulas for evaluating this parameter exhibit a wide range of variations. To tackle this problem, various algorithms and techniques are used to learn patterns and relationships from data, enabling to make more precise predictions. In the present study, a dataset consisting of 162 RC frame-building models was analyzed using ETABS 2016. The fundamental period, a critical output parameter, is predicted using four machine-learning models: Support Vector Machine (SVM), Random Forest (RF), Artificial Neural Network (ANN), and Gradient Boosting Regression (GBR). The performance and accuracy of these models were compared to identify the best-performing model for predicting the fundamental period in structural analysis. The efficiency and precision of the machine learning algorithms were assessed based on the R² and root mean square error (RMSE) values. Among all the models, the GBR exhibited the best performance with an R² (Coefficient of determination) score of 0.9995 and an RMSE of 0.017. These results indicate that the GBR model achieved a high level of accuracy and a low level of prediction error in estimating the fundamental period of the RC frame-building models. © The Author(s), under exclusive licence to Shiraz University 2024.

关键词： ANN Fundamental period GBR RC frame building RF SVM

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Editorial

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Glass Structures and engineering 2024年第1期9卷 1-2页

作者： Nielsen, Jens H. Belis, Jan Louter, Christian Schneider, Jens Overend, Mauro Bridges International Organization COWI A/S Technical University of Denmark Kgs. Lyngby1702 Denmark Department of Structural Engineering Ghent University Ghent Belgium Faculty of Civil Engineering & amp Geosciences Organization Technical University of Delft Delft Netherlands Faculty of Architecture and the Built Environment Technical University of Delft Delft Netherlands Institute of Structural Mechanics and Design TU Wien Technische Universität Darmstadt Wien Austria

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Corrosion behavior of single-and poly-crystalline dual-phase TiAl–Ti3Al alloy in NaCl solution

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 689-696页

作者： Dongpeng Wang Guang Chen Anding Wang Yuxin Wang Yanxin Qiao Zhenguang Liu Zhixiang Qi Chain Tsuan Liu School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Centre for Advanced Structural Materials Department of Mechanical and Biomechanical EngineeringCity University of Hong KongHong Kong 999077China Engineering Research Center of Materials Behavior and Design Ministry of EducationNanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China

To clarify the correlation of single-crystalline structure with corrosion performance in high-strength TiAl alloys, electrochemical and surface characterization was performed by comparing Ti–45Al–8Nb dual-phase single crystals with their polycrystalline counterparts in NaCl solution. Polarization curves show a lower corrosion rate and a higher pitting potential of ~280 mV for the dual-phase single crystals. Electrochemical impedance spectroscopy and potentiostatic polarization plots revealed a higher impedance of the charge transfer through the compact passive film. Surface composition analysis indicated a compact film with more content of Nb, as twice as that in the film on the *** results reflect that the dual-phase Ti–45Al–8Nb single crystals possess a higher corrosion resistance in NaCl solution, compared with their polycrystalline counterpart, arising from a more homogeneous microstructure and composition distribution.

关键词： titanium alloy single crystal corrosion X-ray photoelectron spectroscopy

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Numerical Study on Fatigue Behavior of Grouted Connection in Offshore Wind Turbine Under Axial Load 6th

Numerical Study on Fatigue Behavior of Grouted Connection in...

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6th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures, SMAR 2022

作者： Lei, T.G. Fang, Q. Chen, T. Yuan, G.K. Chen, K. Tongji University Shanghai200092 China Department of Structural Engineering Tongji University Shanghai200092 China China Energy Engineering Group Guangdong Electric Power Design Institute Co. Ltd. Guangzhou510663 China

ISBN: (纸本)9789819933617

With the increasing size and power of offshore wind turbines (OWT), new challenges had been brought to the development of offshore wind technology. Under wind and wave loadings, grouted connections of the OWT support structure can be damaged from fatigue problems, and therefore it is the key part of the design. Research has been carried out to determine the parameters that affect the fatigue behaviour of grouted connections through experiments and numerical simulations. In this paper, a numerical analysis of four parameters was carried out. The numerical model was built and verified by the static test results. By setting four parameters of fatigue load upper limit, longitudinal error, transverse error, and load eccentricity, the influence of different parameters on the fatigue life of grouted connections was analysed by using the fatigue life analysis method of the grout layer. It was found that the fatigue life decreases when the load upper limit increases;the distance between the lowest shear and the bottom edge of the outer tube is a key parameter when there is a longitudinal error, and it is recommended that the longitudinal error does not exceed this value;the fatigue life of grout layer is inversely proportional to the transverse error;the eccentricity has a great influence on the fatigue life of the grouted connection. © Tongji University Press 2024.

关键词： Errors

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Multy Body Rope Approach and Funicular Prototype for a New Constructive System for Catenary Arches 2nd

Multy Body Rope Approach and Funicular Prototype for a Ne...

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2nd Italian Workshop on Shell and Spatial Structures, IWSS 2023

作者： Cavaliere, Ilaria Fallacara, Giuseppe Manuello Bertetto, Amedeo Melchiorre, Jonathan Marano, Giuseppe Carlo Department of Architecture Construction and Design Politecnico di Bari Bari Italy Politecnico di Torino DISEG Department of Structural Geotechnical and Building Engineering Corso Duca Degli Abruzzi 24 Turin10128 Italy College of Civil Engineering Fuzhou University Fuzhou350108 China

ISBN: (纸本)9783031443275

The proposed method for the definition of the form is based on a multi-body rope approach (MRA) with masses connected by inextensible ropes characterized by a certain slack coefficient and by different constraint conditions. These parameters played a fundamental role in the definition of the shallowness ratio of the grid (rope), and therefore in the effect of the instability of the reversed shape under loading. In this paper, different MRA enhancing strategies were proposed and discussed. These approaches were used to determine the final shape of a funicular prototype for a pavilion inspired by Guarino Guarini’s architecture. The prototype project is based on the principle of Gaudi’s inverted catenary arch. It is composed of a series of arches, each one obtained hanging a metallic chain - which assumed the shape of a catenary curve - and then welding all the rings in order to fix its form. Different possible configurations will be described in this paper. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Rope

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