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Seismic design and analysis of a high-rise self-centering wallbuilding:Case study

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Frontiers of Structural and civil engineering 2023年第11期17卷 1690-1706页

作者： Ying ZHOU Rui WANG Yiqiu LU state Key Laboratory of Disaster Reduction in civil engineering College of Civil EngineeringTongji UniversityShanghai 200092China

Post-tensioning self-centering walls are a well-developed and resilient ***,despite extensive research,the application of this technology has previously been limited to low-rise buildings.A ten-story selfcentering wall building has now been designed and constructed using the state-of-art design methodologies and construction detailing,as described in this *** building is designed in accordance with direct displacement-based design methodology,with modification of seismic demand due to relevant issues including higher-mode effects,second order effects,torsional effects,and flexural deformation of wall *** sections are designed with external energydissipating devices of steel dampers,and seismic performance of such designed self-centering walls is evaluated through numerical *** is the first engineering project that uses self-centering walls in a high-rise *** seismic design procedure of such a high-rise building,using self-centering wall structures,is comprehensively reviewed in this work,and additional proposals are put *** of construction detailing,including slotted beams,flexible wall-to-floor connections,embedded beams,and damper installation,is *** demonstration project promotes the concept of seismic resilient structures and contributes to the most appealing city planning strategy of resilient cities at *** paper could be a reference for industry engineers to promote the self-centering wall systems worldwide.

关键词： self-centering wall post-tensioned precast concrete wall seismic resilient structure high-rise building seismic design engineering practice

Porous Shish-Kebab Structure Prepared from Oriented UHMWPE Films by Processing in Supercritical CO_(2)

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Chinese Journal of Polymer Science 2024年第1期42卷 97-104,I0009页

作者： Sergey A.Lermontov Aleksey V.Maksimkin Nataliya A.Sipyagina Tarek Dayyoub Alena N.Malkova Evgeniy A.Kolesnikov Elena A.Straumal Inna O.Gozhikova Saidkhodzha G.Nematulloev Dmitry V.Telyshev Institute of Physiologically Active Compounds of the Russian Academy of Sciences Chernogolovka 142432Russia Institute for Bionic Technologies and engineering I.M.Sechenov First Moscow State Medical University(Sechenov University)Moscow 19991Russia national university of Science and Technology"MISIS"moscow 119049 Russia Institute of Biomedical Systems National Research University of Electronic TechnologyZelenogradMoscow 124498Russia

For the first time, a highly crystalline porous shish-kebab structure with a high degree of crystallinity was obtained by using a combination of two methods for the formation of porous polymeric materials. A treatment procedure using supercritical carbon dioxide(sc CO_(2))was carried out for oriented ultrahigh molecular weight polyethylene(UHMWPE) films, which provided special conditions for the crystallization of dissolved UHMWPE macromolecules on the surface of oriented UHMWPE crystals. The prepared porous materials were investigated by scanning electron microscopy(SEM) and differential scanning calorimetry(DSC). The particularity of the obtained porous shish-kebab is the absence of the amorphous phase between lamellar crystals(kebabs). The obtained pores had an oval shape, and they were oriented in the orientation direction of the UHMWPE macromolecules. The pore size ranged from 0.05 μm to 4 μm. Controlling the conditions for the crystallization of the UHMWPE macromolecules using supercritical CO_(2) gives the possibility to control the size of both lamellar disks and pores formed.

关键词： UHMWPE Supercritical CO_(2) Porous shish-kebab structure

Identification of the nonlinear properties of rubber-bearings in base-isolated buildings with limited seismic response data

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Science China(Technological Sciences) 2013年第5期56卷 1224-1231页

作者： LEI Ying HE MingYu Department of civil engineering Xiamen University state Key Laboratory for Disaster Reduction in civil engineering Tongji University

Seismic behaviors of base-isolated structures are highly affected by the nonlinear characteristics of the isolated systems. Most of the currently available methods for the identification of nonlinear properties of isolator require either the measurements of all structural responses or the assumptions of the proper mathematic models for the rubber-bearings. In this paper, two algorithms are proposed to identify the nonlinear properties of rubber-bearings in base-isolated buildings using only partial measurements of structural dynamic responses. The first algorithm is applicable to the case that proper mathematical models are available for the base isolators. It is based on the extended Kalman filter for the parametric identification of nonlinear models of rubber-bearing isolators and buildings. For the general case where it is difficult to establish a proper mathematical model to describe the nonlinear behavior of a rubber-bearing isolator, another algorithm is proposed to identify the model-tYee nonlinear property of rubber-bearing isolated system. Nonlinear effect of rubber-bearing is treated as ＇fictitious loading＇ on the linear building under severe earthquake. The algorithm is based on the sequential Kalman estimator for the structural responses and the least-squares estimation of the ＇fictitious loading＇ to identify the nonlinear force of rubber-bearing isolator. Simulation results demonstrate that the proposed two algorithms are capable of identifying the nonlinear properties of rubber-bearing isolated systems with good accuracy.

关键词： base-isolation nonlinearit system identification partial observation model-free extended Kalman filter Kalman esti-mator least-squares estimation

A Time-Domain Coupled Model for Nonlinear Wave Forces on A Fixed Box-Shaped Ship in A Harbor

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China Ocean engineering 2010年第1期24卷 41-56页

作者：王大国邹志利谭国焕刘霞 Center for Material Failure Modeling research Dalian University The state Key Laboratory of Coastal and Offshore engineering Department of Civil EngineeringDalian University of Technology Department of civil and Structural engineering The University of Hong Kong

A 2-D time-domain numerical coupled model is developed to obtain an efficient method for nonlinear wave forces on a fixed box-shaped ship in a harbor. The domain is divided into an inner domain and an outer domain. The inner domain is the area beneath the ship and the flow is described by the simplified Euler equations. The other area is the outer domain and the flow is defined by the higher-order Boussinesq equations in order to consider the nonlinearity of the wave motions. Along the interface boundaries between the inner domain and the outer domain, the volume flux is assumed to be continuous and the wave pressures are equal. Relevant physical experiment is conducted to validate the present model. It is shown that the numerical results agree with the experimental data. Compared with the coupled model with the flow in the inner domain governed by the Laplace equation, the present coupled model is more efficient and its solution procedure is more simple, which is particularly useful for the study on the effect of the nonlinear wave forces on a fixed box-shaped ship in a large harbor.

关键词： coupled model wave forces Boussinesq equations Euler equations

An end-to-end 3D seismic simulation of underground structures due to point dislocation source by using an FK-FEM hybrid approach

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Frontiers of Structural and civil engineering 2022年第12期16卷 1515-1529页

作者： Zhenning BA Jisai FU Zhihui ZHU Hao ZHONG state Key Laboratory of Hydraulic engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of civil engineering Tianjin UniversityTianjin 300350China national engineering research Center of High Speed Railway Construction Technology Central South UniversityChangsha 410075China School of civil engineering Central South UniversityChangsha 410075China

Based on the domain reduction idea and artificial boundary substructure method,this paper proposes an FK-FEM hybrid approach by integrating the advantages of FK and FEM(i.e.,FK can efficiently generate high-frequency three translational motion,while FEM has rich elements types and constitutive models).An advantage of this approach is that it realizes the entire process simulation from point dislocation source to underground *** with the plane wave field input method,the FK-FEM hybrid approach can reflect the spatial variability of seismic motion and the influence of source and propagation *** approach can provide an effective solution for seismic analysis of underground structures under scenario of earthquake in regions where strong earthquakes may occur but are not recorded,especially when active faults,crustal,and soil parameters are *** Daikai subway station as an example,the seismic response of the underground structure is simulated after verifying the correctness of the approach and the effects of crustal velocity structure and source parameters on the seismic response of Daikai station are *** this example,the influence of velocity structure on the maximum interlayer displacement angle of underground structure is 96.5%and the change of source parameters can lead to the change of structural failure direction.

关键词： source-to-structure simulation FK-FEM hybrid approach underground structures point dislocation source

A 3-D Time-Domain Coupled Model for Nonlinear Waves Acting on A Box-Shaped Ship Fixed in A Harbor

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China Ocean engineering 2011年第3期25卷 441-456页

作者：王大国邹志利 THAM Leslie George Center for Material Failure Modeling research Dalian University The state Key Laboratory of Coastal and Offshore engineering Department of Civil EngineeringDalian University of Technology Department of civil and Structural engineering The University of Hong Kong

A 3-D time-domain numerical coupled model is developed to obtain an efficient method for nonlinear waves acting on a box-shaped ship fixed in a harbor. The domain is divided into the inner domain and the outer domain. The inner domain is the area beneath the ship and the flow is described by the simplified Euler equations. The remaining area is the outer domain and the flow is defined by the higher-order Boussinesq equations in order to consider the nonlinearity of the wave motions. Along the interface boundaries between the inner domain and the outer domain, the volume flux is assumed to be continuous and the wave pressures are equal. Relevant physical experiment is conducted to validate the present mode/and it is shown that the numerical results agree with the experimental data. Compared the coupled model with the flow in the inner domain governed by the Laplace equation, the present coupled model is more efficient and its solution procedure is simpler, which is particularly useful for the study on the effect of the nonlinear waves acting on a fixed box-shaped ship in a large harbor.

关键词： nonlinear waves coupled model Boussinesq equations Euler equations

Rheological properties of dense natural cohesive sediments subject to shear loadings

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International Journal of Sediment research 2014年第4期29卷 454-470页

作者： Wen-yu YANG Guo-liang YU Soon keat TAN Hua-kun WANG state Key Laboratory of Ocean engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong University Maritime research Centre School of Civil and Environmental EngineeringNanyang Technological University

Cohesive sediments exhibit complex rheological behaviors that are non-Newtonian and time-dependent when subjected to external *** paper presents the results of an investigation on the rheological properties of three types of dense cohesive sediments,collected from the mouth of the Yangtze River,the shoal of the Hangzhou Bay,and the Yangcheng Lake in China.A set of rheological parameters(including viscosity,yield stress,etc.) was studied based on experiments that were conducted with a RheolabQC *** of the flow curves,shear stress-time responses,and yield stresses were *** solid-liquid transition of the dense cohesive sediments occurred both in the shear rate ramp tests and the shear stress ramp *** transition was not direct,but it was mediated by a transitional deformation regime or stress *** the Herschel-Bulkley model and Carreau model were able to describe the rheological behavior of dense cohesive sediments,and the empirical expressions for calculating the parameters in these models were obtained by a dimensional and regression *** yield stresses determined by the shear stress ramp test and by the vane method were compared and *** influence of the water content on the rheological properties of dense cohesive sediments was considered.

关键词： Rheology Cohesive sediment Solid-liquid transition Thixotropy Yield stress

Effects of seismic devices on transverse responses of piers in the Sutong Bridge

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Earthquake engineering and engineering Vibration 2015年第4期14卷 611-623页

作者： Shen Xing Alfredo Camara Ye Aijun state Key Laboratory for Disaster Reduction in civil engineering Tongji University Department of civil and engineering City UniversityLondonUnited Kingdom PhD

The Sutong Bridge in China opened to traffic in 2008, and is an arterial connection between the cities of Nantong and Suzhou. It is a cable-stayed bridge with a main span of 1,088 m. Due to a tight construction schedule and lack of suitable seismic devices at the time, fixed supports were installed between the piers and the girder in the transverse direction. As a result, significant transverse seismic forces could occur in the piers and foundations, especially during a return period of a 2500-year earthquake. Therefore, the piers, foundations and fixed bearings had to be designed extraordinarily strong. However, when larger earthquakes occur, the bearings, piers and foundations are still vulnerable. The recent rapid developments in seismic technology and the performance-based design approach offer a better opportunity to optimize the transverse seismic design for the Sutong Bridge piers. The optimized design can be applied to the Sutong Bridge(as a retrofit), as well as other bridges. Seismic design alternatives utilizing viscous fluid dampers(VFD), or friction pendulum sliding bearings(FPSB), or transverse yielding metallic dampers(TYMD) are thoroughly studied in this work, and the results are compared with those from the current condition with fixed transverse supports and a hypothetical condition in which only sliding bearings are provided on top of the piers(the girder can move "freely" in the transverse direction during the earthquake, except for frictional forces of the sliding bearings). Parametric analyses were performed to optimize the design of these proposed seismic devices. From the comparison of the peak bridge responses in these configurations, it was found that both VFD and TYMD are very effective in the reduction of transverse seismic forces in piers, while at the same time keeping the relative transverse displacements between piers and the box girder within acceptable limits. However, compared to VFD, TYMD do not interact with the longitudinal disp

关键词： Sutong Bridge cable-stayed bridge seismic devices transverse response bridge piers viscous fluid dampers(VFD) friction pendulum sliding bearings(FPSB) transverse yielding metallic dampers(TYMD)

Recent progress of seismic research on tall buildings in China Mainland

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Earthquake engineering and engineering Vibration 2014年第S1期13卷 47-61页

作者： Lu Xilin Jiang Huanjun state Key Laboratory of Disaster Reduction in civil engineering Tongji University

As a result of rapid economic growth and urbanization in the past two decades,many tall buildings have been constructed in China Mainland,offering researchers and practitioners an excellent opportunity for research and practice in the field of structural engineering. This paper reviews progress by researchers throughout China Mainland on the seismic research of tall buildings,focusing on three major topics that impact the seismic performance of tall buildings. These are:(1) new types of steel-concrete composite structural members such as steel-concrete composite shear walls and columns,(2) earthquake resilient shear wall structures such as shear walls with replaceable structural components,self-centering shear walls and rocking walls,and(3) performance-based seismic design,including seismic performance index,performance level and design method. The paper concludes by presenting future research needs and directions in this field.

关键词： tall buildings steel-concrete composite member earthquake resilient structure performance-based seismic design