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structural Capacity assessment of Cultural Bridges Key Study Dragoti Bridge

Journal of Civil Engineering and Architecture 2023年第1期17卷 1-11页

作者： Arian Lako Shkelqim Gjevori Xhorxhia Lako Edvin Paçi Department of Civil Engineering Faculty of Civil EngineeringPolytechnic University of TiranaTirana 1001Albania Instituti i Studimeve tëTransportit Ministria e Infrastrukturës dhe EnergjisëTirana 1001Albania Free Lancer Paris 75019France

In this presentation,we have shown the methodology for the structural assessment of bridges that belong to the inventory of cultural heritage.Due to the significant number of“sub-standard”bridges,it is impossible for interventions in these bridges to be simultaneous and immediate,so certain criteria and priorities must be established in the ways of interventions for their rehabilitation.Bridges that are most at risk and need to be rehabilitated as soon as possible should be determined,and bridges that can be rehabilitated at a later stage should be identified.The prioritization scheme should include a number of aspects beyond the“pure engineering”ones.Main in this process are:seismicity of the area and the probability of the seismic event,vulnerability of the structure.Different structural systems may be considered to be more vulnerable in the event of an earthquake than others,and therefore may need attention as soon as possible.To make this preliminary assessment,we used the methodology of the US Highway Federation,then we proceed with the in-depth assessment of the carrying capacity using the well-known“time history”or“push over”methods,according to the specific case.As an example for the application of this methodology,we have taken the Dragoti Bridge,a category II cultural monument,the bridge with the largest span of light in Albania of 108 m.

关键词： Dragoti Bridge structural rehabilitation structural assessment

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Shear assessment of compression flanges of structural concrete T-beams

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Frontiers of structural and Civil Engineering 2014年第4期8卷 354-361页

作者： Bjorn SCHUTTE Viktor SIGRIST Institute of Concrete Structures Hamburg University of Technology Hamburg 21073 Germany

In T-beams the force transfer from the web into the flange has to be studied. The general design procedure is based on a strut-and-tie （or a stress field） model which comprises spreading compressive and transverse tensile forces. As is known, strut-and-tie models represent the force flow within a structural member at ultimate. This procedure is sufficient for design purposes and in general, leads to safe results. For the assessment of a structure it may be worthwhile to improve the accuracy. For this purpose both web and flange have to be looked at more in detail. An advanced method for the analysis of webs in shear is the Generalized Stress Field Approach [1]. This approach can be utilized for treating flanges, where the classical assumptions have to be adapted; in particular by considering the strain dependence of the concrete compressive strength and thus, defining a representative strain value. In the present contribution background and details of these aspects are given, and the corresponding calculation procedure is described. Theoretical results are compared with experimental data and show a reasonably good agreement. However, as the number of sufficiently documented tests is very limited no concluding findings are attained.

关键词： concrete structures structural assessment stress field analysis shear

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AN EFFICIENT assessment METHOD FOR INTELLIGENT DESIGN RESULTS OF SHEAR WALL STRUCTURE BASED ON MECHANICAL PERFORMANCE,MATERIAL CONSUMPTION,AND EMPIRICAL RULES

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工程力学 2023年第12期40卷 148-159页

作者：覃思中廖文杰林元庆陆新征 Department of Civil Engineering Tsinghua UniversityBeijing 100084China China Nuclear Power Engineering Co. Ltd Zhengzhou BranchZhengzhou 450052China

Efficient methods for incorporating engineering experience into the intelligent generation and optimization of shear wall structures are lacking,hindering intelligent design performance assessment and enhancement.This study introduces an assessment method used in the intelligent design and optimization of shear wall structures that effectively combines mechanical analysis and formulaic encoding of empirical rules.First,the critical information about the structure was extracted through data structuring.Second,an empirical rule assessment method was developed based on the engineer's experience and design standards to complete a preliminary assessment and screening of the structure.Subsequently,an assessment method based on mechanical performance and material consumption was used to compare different structural schemes comprehensively.Finally,the assessment effectiveness was demonstrated using a typical case.Compared to traditional assessment methods,the proposed method is more comprehensive and significantly more efficient,promoting the intelligent transformation of structural design.

关键词： shear wall structure structural assessment data structuring intelligent design structural optimization

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Research and Implementations of structural Monitoring for Bridges and Buildings in Japan

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Engineering 2019年第6期5卷 1093-1119页

作者： Yozo Fujino Dionysius MSiringoringo Yoshiki Ikeda Tomonori Nagayama Tsukasa Mizutani Institute of Advanced Sciences Yokohama National UniversityYokohama 240-8501Japan Disaster Prevention Research Institute Kyoto UniversityKyoto 611-0011Japan Department of Civil Engineering The University of TokyoTokyo 113-8656Japan

This paper provides a review on the development of structural monitoring in Japan, with an emphasis on the type, strategy, and utilization of monitoring systems. The review focuses on bridge and building structures using vibration-based techniques. structural monitoring systems in Japan historically started with the objective of evaluating structural responses against extreme events. In the development of structural monitoring, monitoring systems and collected data were used to verify design assumptions, update speci cations, and facilitate the ef cacy of vibration control systems. Strategies and case studies on monitoring for the design veri cation of long-span bridges and tall buildings, the performance of seismic isolation systems in building and bridges, the veri cation of structural retro t, the veri cation of structural control systems (passive, semi-active, and active), structural assessment, and damage detec- tion are described. More recently, the application of monitoring systems has been extended to facilitate ef cient operation and effective maintenance through the rationalization of risk and asset management using monitoring data. This paper also summarizes the lessons learned and feedback obtained from case studies on the structural monitoring of bridges and buildings in Japan.

关键词： structural monitoring Long-span bridge High-rise building Seismic monitoring Wind-induced responses Pavement and slab monitoring structural control monitoring structural assessment

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System Identification of Heritage Structures Through AVT and OMA:A Review

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structural Durability & Health Monitoring 2019年第1期13卷 1-40页

作者： Vinay Shimpi Madappa V.R.Sivasubramanian S.B.Singh Department of Civil Engineering National Institute of Technology PuducherryKaraikal609609India Department of Civil Engineering Birla Institute of Technology and Science PilaniPilani333031India

In this review article,the past investigations carried out on heritage structures using Ambient Vibration Test(AVT)and Operational Modal Analysis(OMA)for system identification(determination of dynamic properties like frequency,mode shape and damping ratios)and associated applications are summarized.A total of 68 major research studies on heritage structures around the world that are available in literature are surveyed for this purpose.At first,field investigations carried out on heritage structures prior to conducting AVT are explained in detail.Next,specifications of accelerometers,location of accelerometers and optimization of accelerometer networks have been elaborated with respect to the geometry of the heritage structures.In addition to this,ambient vibration loads and data acquisition procedures are also discussed.Further,the state of art of performing OMA techniques for heritage structures is explained briefly.Furthermore,various applications of system identification for heritage structures are documented.Finally,conclusions are made towards errorless system identification of heritage structures through AVT and OMA.

关键词： Ambient Vibration Test(AVT) heritage structures Operational Modal Analysis(OMA) structural assessment system identification

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Application of Damage Mechanics for Prediction of Failure of structural Materials and Elements

Application of Damage Mechanics for Prediction of Failure of...

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作者： P.G.KOSSAKOWSKI Department of Strength of Materials Concrete and Bridge StructuresKielce University of Technology

The article deals with the practical application of damage mechanics for modelling and predicting the failure of materials and structural elements.One of the recently developed and used models of Bai–Wierzbicki material is discussed in more detail.In this model the effect of hydrostatic pressure and the third invariant of the deviatoric stress on the process of the material plastic deformation is taken into account.It allows to model damage processes in the material and predict its total failure with high accuracy.Consequently,this enables the practical application in engineering calculations of structural elements.As an example,several such analyses were presented and discussed.They included the simulations of tensile elements made of C45 E+N steel under proportional and non-proportional loading conditions in uniaxial and spatial stress state.Another analysis considered numerical simulations of the ductile fracture in Battelle Drop-WeightTear（BDWT） specimens used in pipeline sections tests.The problem concerned the phenomenon of block shear failure in bolted steel connections was the subject of the last presented simulations.

关键词： Damage mechanics Failure Bai–Wierzbicki material model structural assessment structural integrity

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structural Integrity Management of Mobile Offshore Platforms

Structural Integrity Management of Mobile Offshore Platforms

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作者： LI Hongtao XU Jie LI Ye DING Guolin Tianjin Branch of China Classification Society

The principle of structural Integrity Management（SIM） is introduced into management of mobile offshore platforms.Based on SIM process which consists of four primary elements of data,evaluation,strategy,and program,the requirements of damage evaluation,fitness-for-purpose assessment,inspection planning,strengthening and mitigation measures can be realized for mobile offshore units.A structure safety management system developed based on the theory of SIM is then recommended and practice shows that SIM can be effectively applied to the mobile offshore units and its application is of great significance on the safe operation and scientific management of the platforms.

关键词： mobile offshore platform structural integrity management structural assessment inspection planning

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