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Evaluation of collapse resistance of RC frame structures for Chinese schools in seismic design categories B and C

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Earthquake Engineering and Engineering Vibration 2011年第3期10卷 369-377页

作者： Tang Baoxin lu xinzheng Ye Lieping Shi Wei Department of Civil Engineering Yangzhou University Yangzhou 225009 China Key Laboratory of Structural Engineering and Vibration of China Education Ministry Department of Civil Engineering Tsinghua University Beijing 100084 China

According to the Code for Seismic Design of Buildings （GB50011-2001）, ten typical reinforced concrete （RC） frame structures, used as school classroom buildings, are designed with different seismic fortification intensities （SFIs）（SFI=6 to 8.5） and different seismic design categories （SDCs）（SDC=B and C）. The collapse resistance of the frames with SDC=B and C in terms of collapse fragility curves are quantitatively evaluated and compared via incremental dynamic analysis （IDA）. The results show that the collapse resistance of structures should be evaluated based on both the absolute seismic resistance and the corresponding design seismic intensity. For the frames with SFI from 6 to 7.5, because they have relatively low absolute seismic resistance, their collapse resistance is insufficient even when their corresponding SDCs are upgraded from B to C. Thus, further measures are needed to enhance these structures, and some suggestions are proposed.

关键词： RC frame structures collapse resistance fragility curves seismic fortification intensity incremental dynamic analysis mega-earthquake

Collapse simulation of a super high-rise building subjected to extremely strong earthquakes

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Science China(Technological Sciences) 2011年第10期54卷 2549-2560页

作者： lu Xiao lu xinzheng ZHANG WanKai YE LiePing Department of Civil Engineering Tsinghua UniversityBeijing 100084China

In recent years, super high-rise buildings (>500 m) are developing very quickly and become an important frontier of civil engineering. The collapse resistance of super high-rise buildings subjected to extremely strong earthquake is a critical problem that must be intensively studied. This paper builds up a nonlinear finite element model of the tallest building in China, Shang- hai Tower (632 m), and proposes the modeling method and failure criteria for different structural elements. The dynamic char- acters of this building are then analyzed, and the possible failure modes and collapse processes due to earthquakes are pre- dicted, as well as the corresponding collapse mechanism. This work will be helpful in collapse prevention and the seismic design of super high-rise buildings.

关键词： super high-rise building collapse simulation extremely strong earthquake finite element method

On the satisfiability of authorization requirements in business process

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Frontiers of Computer Science 2017年第3期11卷 528-540页

作者： Yang BO Chunhe XIA Zhigang ZHANG xinzheng lu Beijing Key Laboratory of Network Technology Beihang University Beijing 100191 China School of Computer Science and Engineering Beihang University Beijing 100191 China The Research Institute of Beihang University in Shenzhen Shenzhen 518057 China National Education Examinations Authority Ministry of Education Beijing 100084 China

Satisfiability problem of authorization require- ments in business process asks whether there exists an as- signment of users to tasks that satisfies all the requirements, and methods were proposed to solve this problem. However, the proposed methods are inefficient in the sense that a step of the methods is searching all the possible assignments, which is time-consuming. This work proposes a method to solve the satisfiability problem of authorization requirements with- out browsing the assignments space. Our method uses im- proved separation of duty algebra （ISoDA） to describe a sat- isfiability problem of qualification requirements and quan- tification requirements （Separation of Duty and Binding of Duty requirements）. Thereafter, ISoDA expressions are re- duced into multi-mutual-exclusive expressions. The satisfia- bilities of multi-mutual-exclusive expressions are determined by an efficient algorithm proposed in this study. The experiment shows that our method is faster than the state-of-the-art methods.

关键词： satisfiability authorization requirements separation of duty binding of duty business process

An improved ground motion intensity measure for super high-rise buildings

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Science China(Technological Sciences) 2013年第6期56卷 1525-1533页

作者： lu Xiao YE LiePing lu xinzheng LI MengKe MA XiaoWei Department of Civil Engineering Tsinghua University

Ground motion intensity measure (IM) is an important part in performance-based seismic design. A reasonable and efficient IM can make the prediction of the structural seismic responses more accurate. Therefore, a more reasonable IM for super high-rise buildings is proposed in this paper. This IM takes into account the significant characteristic that higher-order vibration modes play important roles in the seismic response of super high-rise buildings, as well as the advantages of some existing IMs. The key parameter of the proposed IM is calibrated using a series of time-history analyses. The collapse simulations of two super high-rise buildings are used to discuss the suitability of the proposed IM and some other existing IMs. The results indicate that the proposed IM yields a smaller coefficient of variation for the critical collapse status than other existing IMs and performs well in reflecting the contribution of higher-order vibration modes to the structural response. Hence, the proposed IM is more applicable to seismic design for super high-rise buildings than other IMs.

关键词： ground motion intensity measure super high-rise building time-history analysis collapse analysis

Development and Application of a High-Performance Triangular Shell Element and an Explicit Algorithm in OpenSees for Strongly Nonlinear Analysis

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Computer Modeling in Engineering & Sciences 2019年第9期120卷 561-582页

作者： xinzheng lu Yuan Tian Chujin Sun Shuhao Zhang Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil EngineeringTsinghua UniversityBeijing100084China Beijing Engineering Research Center of Steel and Concrete Composite Structures Tsinghua UniversityBeijing100084China.

The open-source finite element software,OpenSees,is widely used in the earthquake engineering ***,the shell elements and explicit algorithm in OpenSees still require further ***,in this work,a triangular shell element,NLDKGT,and an explicit algorithm are proposed and implemented in ***,based on the generalized conforming theory and the updated Lagrangian formulation,the proposed NLDKGT element is suitable for problems with complicated boundary conditions and strong *** accuracy and reliability of the NLDKGT element are validated through typical ***,by adopting the leapfrog integration method,an explicit algorithm in OpenSees and a modal damping model are ***,the stability and efficiency of the proposed shell element and explicit algorithm are validated through the nonlinear time-history analysis of a highrise building.

关键词： Triangular shell element explicit algorithm OpenSees strong nonlinearity

Influence of soil——structure interaction on seismic collapse resistance of super-tall buildings

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Journal of Rock Mechanics and Geotechnical Engineering 2014年第5期6卷 477-485页

作者： Mengke Li Xiao lu xinzheng lu Lieping Ye Key Laboratory of Civil Engineering Safety and Durability of Education Ministry Tsinghua University School of Civil Engineering Beijing Jiaotong University

Numerous field tests indicate that the soilestructure interaction （SSI） has a significant impact on thedynamic characteristics of super-tall buildings, which may lead to unexpected structural seismic responsesand/or failure. Taking the Shanghai Tower with a total height of 632 m as the research object, thesubstructure approach is used to simulate the SSI effect on the seismic responses of Shanghai Tower. Therefined finite element （FE） model of the superstructure of Shanghai Tower and the simplified analyticalmodel of the foundation and adjacent soil are established. Subsequently, the collapse process of ShanghaiTower taking into account the SSI is predicted, as well as its final collapse mechanism. The influences ofthe SSI on the collapse resistance capacity and failure sequences are discussed. The results indicate that,when considering the SSI, the fundamental period of Shanghai Tower has been extended significantly,and the collapse margin ratio has been improved, with a corresponding decrease of the seismic *** addition, the SSI has some impact on the failure sequences of Shanghai Tower subjected to extremeearthquakes, but a negligible impact on the final failure modes. 2014 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting byElsevier B.V. All rights reserved.

关键词： Soil-structure interaction Substructure Super-tall building Collapse resistance Numerical simulation

A preliminary analysis and discussion of the condominium building collapse in surfside,Florida,US,June 24,2021

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Frontiers of Structural and Civil Engineering 2021年第5期15卷 1097-1110页

作者： xinzheng lu Hong GUAN Hailin SUN Yi LI Zhe ZHENG Yifan FEI Zhi YANG Lingxiao ZUO Key Laboratory of Civil Engineering Safety and Durability of Ministry of Education Tsinghua UniversityBeijing 100084China School of Engineering and Built Environment Griffith University Gold Coast CampusQueensland 4222Australia China Architecture Design&Research Group Co. LtdBeijing 100044China Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit Beijing University of TechnologyBeijing 100124China

On June 24,2021,a 40-year-old reinforced concrete flat plate structure building in Miami suffered a sudden partial *** study analyzed the overall performance and key components of the collapsed building based on the building design codes(ACI-318 and GB 50010).Punching shear and post-punching performances of typical slabcolumn joints are also studied through the refined finite element *** collapse process was simulated and visualized using a physics *** way of these analyses,weak design points of the collapsed building are *** differences between the reinforcement detailing of the collapsed building and the requirements of the current Chinese code are discussed,together with a comparison of the punching shear and post-punching *** simulated collapse procedure and debris distribution are compared with the actual collapse scenes.

关键词： progressive collapse flat plate simulation punching

Digital twin approach for enhancing urban resilience:A cycle between virtual space and the real world

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Resilient Cities and Structures 2024年第2期3卷 34-45页

作者： Yixing Wang Qingrui Yue xinzheng lu Donglian Gu Zhen Xu Yuan Tian Shen Zhang Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150000China Research Institute of Urbanization and Urban Safety School of Civil and Resource EngineeringUniversity of Science and Technology BeijingBeijing 100083China Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil EngineeringTsinghua UniversityBeijing 100084China Central South Architectural Design Institute Co. Ltd.Hubei 430014China

Construction of disaster-resilient cities has attracted considerable ***,traditional methods of studying urban disaster resilience through experimental approaches are often constrained by various limitations,such as testing sites,costs and ethical *** address these constraints,this paper proposes incor-porating digital twin concepts into urban disaster resilience *** establishing a connection between the physical realm of the city and its virtual counterpart,this approach utilizes digital simulations to overcome the limitations of experimental methods and enables dynamic deduction and control of the disaster *** pa-per delves into three key aspects encompassing the acquisition of data from reality to the virtual space,disaster simulation within the virtual space,and translation of virtual insights into effective disaster prevention strate-gies in *** provides a comprehensive summary of relevant research endeavors from the authors’research group and showcases the effectiveness and potential of the proposed *** findings serve as refer-ences for pre-disaster planning,real-time emergency assessments,post-disaster rescue operations,and accident investigations for buildings and cities.

关键词： Digital twins Disaster simulation Resilience Disaster prevention and mitigation

Quantification of disaster resilience in civil engineering:A review

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Journal of Safety Science and Resilience 2020年第1期1卷 19-30页

作者： xinzheng lu Wenjie Liao Dongping Fang Kaiqi Lin Yuan Tian Chi Zhang Zhe Zheng Pengju Zhao Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil EngineeringTsinghua UniversityBeijing 100084China Beijing Engineering Research Center of Steel and Concrete Composite Structures Tsinghua UniversityBeijing 100084China Department of Construction Management Tsinghua UniversityBeijing 100084China College of Civil Engineering Fuzhou UniversityFuzhou 350108China

Resistance to unexpected disasters and rapid post-disaster recovery(i.e.,disaster resilience)of cities are extremely necessary owing to the concentrated risk of *** quantification can adequately reflect the capacity of a city to withstand *** existing studies have focused on and proposed several frameworks on the quantitative measures of disaster resilience,and the corresponding research objects include different types of disasters(e.g.,earthquake,hurricane,flood,and fire),various domains(e.g.,engineering,social,and economic),and multiple levels(e.g.,city,community,and building).Among these research objects,studies on seismic resilience in civil engineering are relatively ***,studies on resilience in civil engineering have paid significant attention to the dynamics of engineering facilities and the engineering-related social and economic functions,including city-scale engineering,social,and economic functionalities,and essential functionalities of building,transportation,lifeline,and nonphysical subsystems of a ***,based on the review of resilience studies carried out in recent years,the framework and specifications for the quantification of disaster resilience of civil engineering systems subjected to earthquakes and other unexpected disasters are *** of disaster resilience assessment of cities and the corresponding subsystems are ***,several case studies are reviewed,and resilience limit-state analyses of communities and buildings are performed.

关键词： Resilience quantification in civil engineering Urban system Infrastructure and distributed network Single structure Resilience limit state