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1.
Abbas Moustafa 《地震工程与结构动力学》2009,38(9):1143-1149
This discussion consists of two parts. The first part raises a few comments and questions on the method presented in the above paper. The second part proposes a measure for identifying resonant accelerograms in a set of earthquake records without the need for pre‐processing of the records or inclusion of the structure dynamic analysis. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
2.
Discussion on ‘relaxation method for pounding action between adjacent buildings at expansion joint’ by H. Takabatake,M. Yasui,Y. Nakagawa and A. Kishida 
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下载免费PDF全文 The paper under discussion presents a detailed study on the reduction of pounding force on buildings due to expansion joints being filled with rubber. From shake table experiments and numerical simulations, the authors of the paper concluded that the rubber can reduce the maximum pounding force and hence the pounding damage to buildings. However, the writers of this short communication observed some significant issues in the experimental results as well as the numerical simulations. These observations are presented and raise questions about the validity of the results and the subsequent conclusions. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
3.
This discussion raises a few comments and questions on the paper by Cao and Friswell [Cao H, Friswell MI. The effect of energy concentration of earthquake ground motions on the nonlinear response of RC structures. Soil Dyn Earthquake Eng 2009; 29: 292–9.]. The authors consider an interesting problem on seismic response analysis of nonlinear structures. Specifically, the study examines the implication of the energy concentration of the adopted ground acceleration record on the nonlinear response of reinforced concrete structures. The paper employs the wavelet transform to characterize the energy content of the ground acceleration in time and frequency domains. 相似文献
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This discussion is based on the paper by Hubbard and Mavroeidis [1]. In this paper, the authors have presented an interesting study on the effect of near-fault ground motions on the damping coefficients examining single degree of freedom (SDOF) systems. This discussion presents some comments on the results and the conclusions of that paper, which imply that some aspects need further clarification and/or improvement. 相似文献
5.
Discussion on ‘a framework for the evaluation of ground motion selection and modification procedures’ by N. Simon Kwong,Anil K. Chopra,and Robin K. McGuire 下载免费PDF全文
下载免费PDF全文 Brendon A. Bradley 《地震工程与结构动力学》2015,44(5):817-821
The paper under discussion proposes a framework to evaluate ground motion selection and modification procedures and illustrates its application for two different procedures as applied to a non‐degrading bilinear inelastic single‐degree‐of‐freedom system. This discussion focuses on providing additional context that this writer feels is needed in relation to both the proposed framework and also its specific application in the paper, which are important for the conclusions made by the authors. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
6.
Discussion of paper ‘Seismic behavior and modeling of steel reinforced concrete (SRC) walls’ by Xiaodong Ji,Ya Sun,Jiaru Qian and Xinzheng Lu,Earthquake Engineering and Structural Dynamics 2015; 44(6):955–972 下载免费PDF全文
下载免费PDF全文 S. Bahadir Yuksel 《地震工程与结构动力学》2015,44(14):2607-2609
The paper under discussion presents a series of quasi‐static tests used to examine the behavior of steel reinforced concrete (SRC) walls subjected to high axial force and lateral cyclic loading. A total of six wall specimens were designed, including five SRC walls and one reinforced concrete (RC) wall. In the ‘Summary’ section of the discussed paper, the authors state that: ‘The use of SRC walls has gained popularity in the construction of high‐rise buildings because of their superior performance over conventional RC walls’. The authors also proposed that, the SRC wall specimens showed increased flexural strength and deformation capacity relative to their RC wall counterpart. The discussion is prompted to rectify some statements and conclusions of the paper under discussion. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
7.
G.R. Dargahi-Noubary 《Soil Dynamics and Earthquake Engineering》1998,17(5):297-309
A statistical method is proposed for estimation of the corner frequency. It is based on inference for a stochastic model whose short-term behavior resembles the established source time functions. Properties of the estimates are investigated and some numerical examples are presented. A discussion concerning earthquake–explosion discrimination and the way corner frequency can be related to the rate of zero-crossings is also included. The paper is concluded with some numerical examples. 相似文献
8.
A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions 总被引：2，自引：0，他引：2
G. Chisham M. Lester S. E. Milan M. P. Freeman W. A. Bristow A. Grocott K. A. McWilliams J. M. Ruohoniemi T. K. Yeoman P. L. Dyson R. A. Greenwald T. Kikuchi M. Pinnock J. P. S. Rash N. Sato G. J. Sofko J.-P. Villain A. D. M. Walker 《Surveys in Geophysics》2007,28(1):33-109
9.
Keh‐Chyuan Tsai An‐Chien Wu Chih‐Yu Wei Pao‐Chun Lin Ming‐Chieh Chuang Yi‐Jer Yu 《地震工程与结构动力学》2014,43(12):1785-1807
The debonding mechanism has a significant effect on the performance of a buckling‐restrained brace (BRB). In this paper, a method for estimating the compression strength adjustment factor for any given BRB core strain is presented. Experimental investigations were conducted on four BRBs to examine the efficiency of four different debonding materials in reducing the difference between the cyclic peak compression and tension. Test results indicate that chloroprene rubber is very easy to install and very effective in minimizing the difference between the compressive and tensile capacities. The excellent performance of 13 full‐scale welded end‐slot BRBs (WES‐BRBs) is illustrated through experiments. Cyclic loading test results of a 12.5‐m long jumbo WES‐BRB reveal that its peak compressive strength exceeds 16,800 kN and its maximum core strain reaches 0.035. All WES‐BRBs show satisfactory performance with a very stable hysteresis response, modest peak compressive to tensile strength ratio, and very predictable axial stiffness. These specimens sustain a cumulative plastic deformation of greater than 400 times the yield deformation. The hysteresis responses can be satisfactorily predicted by using a two‐surface plasticity analytical model. Advantages of the welded end‐slot connections are also presented through a discussion on the effects of the BRB yield region length ratio on the effective stiffness, the yield story drift, and the core strain level. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
10.
Assessing health of the Bay of Fundy--concepts and framework 总被引：8，自引：0，他引：8
Wells PG 《Marine pollution bulletin》2003,46(9):1059-1077
A discussion of health and ecosystem health (EH) concepts and a conceptual framework for assessing health of the Bay of Fundy are presented. The framework includes:Concepts--What is health? What is EH and marine ecosystem health (MEH)? How does EH relate to other closely related concepts and principles i.e. environmental quality (especially marine or MEQ), ecosystem integrity, and ecosystem sustainability?Importance--Why is EH important, and what are the linkages to people i.e. human health?Approaches and techniques--How do we monitor and measure EH, and in that context, ecosystem or ecological change? i.e. What are the monitoring approaches and tools? What is an appropriate set of EH indicators and indices for the Bay of Fundy and Gulf of Maine? At the present time, can we make unequivocal statements about the status and trends in EH measures of the Bay of Fundy? Do we have adequate guidelines, objectives and standards for assessing environmental quality and EH?Connecting with management needs--Do we have adequate mechanisms in place to address MEH, marine environmental quality (MEQ), and environmental sustainability in the Bay of Fundy? What is the role of periodic marine assessments (state of the marine environment reports) in this activity? What kinds of new directions and new ecosystem science should be given priority? What kinds of other new activities should be pursued?For the Bay of Fundy Coastal Forum at the recent 5th BOFEP Bay of Fundy Science Workshop (May 2002), five core questions flowing from the health framework served to initiate and focus the discussions:Current state--What is the present health or condition of the Bay of Fundy?Changes--Are conditions improving or deteriorating?Indicators--What kinds of indicators do we consider most useful in trying to answer these questions?Existing resources--Are there adequate resources (e.g. institutional, financial, scientific, regulatory) to protect or restore the health of the Bay?Needs--What kinds of new information and approaches do we need to protect the health of the Bay?The background information and ideas of this paper were intended to assist discussion at the Fundy workshop, and to help identify the next steps, both individual and collective, for assessing the health of the Bay of Fundy. 相似文献
11.
The current paper presents an efficient methodology for numerically simulating in three dimensions adjacent buildings that may experience pounding during strong earthquakes. In particular, a new approach to the numerical problem of spatial impact modeling that does not require the ‘a priori’ determination of the contact points is presented, taking also into account the geometry at the vicinity of an impact. In the current study, the buildings are simulated as linear multi‐degree‐of‐freedom‐systems, but the methodology can be easily extended to consider nonlinear behavior as well. A software application has been specifically developed to implement the proposed methodology, using modern object‐oriented design and programming. The developed software is utilized in a simple example, and the computed results are compared with the corresponding analysis results obtained from a commercial general‐purpose software application that uses typical contact elements for the simulation of impacts. A discussion follows on the advantages and capabilities of the proposed methodology and the developed software. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
12.
YONG CHEN GE PING LI QI FU CHEN LING CHEN MIN FENG LI Center for Analysis Prediction China Seismological Bureau Beijing China 《地震学报(英文版)》1998,11(6):751-758
ＩｎｔｒｏｄｕｃｔｉｏｎＡｓｅｓｉｎｇｔｈｅｐｏｔｅｎｔｉａｌｅａｒｔｈｑｕａｋｅｄａｍａｇｅａｎｄｌｏｓｉｎａｒｅｇｉｏｎｉｓｉｍｐｏｒｔａｎｔｆｏｒｍａｎｙａｓｐｅｃｔｓ,ｓｕｃｈａｓｒｉｓｋｍｉｔｉｇａｔｉｏｎ,ｒｅｓｏｕｒｃｅｓａｌｏｃａｔ... 相似文献
13.
The paper proposes a systematic comparison between two methods of analysis that are well established in the field of earthquake engineering: nonlinear dynamic analysis and nonlinear static procedure (NSP), applied to the out‐of‐plane seismic response of two masonry façades representative of many ancient Italian churches. The comparison is based on extensive numerical analyses, which focus on the flexural and torsional mechanisms, while the in‐plane damage mechanisms and the possible detachment between the façade and the lateral walls because of a poor connection have been presently disregarded. The computations, both in the static and in the dynamic field, are based on a rigid body and spring model specifically implemented for this issue, computationally efficient and equipped with a realistic model of damage and hysteresis at the mesoscale. An innovative aspect of this study is the heuristic modelling of three‐wythe masonry, to include some typical texture effects on the macroscale nonlinear response. For each façade, two different masonry textures were considered, performing extensive dynamic analyses that offered a detailed overview about the performance under earthquakes of different intensities. In parallel, NSP and the classical N2‐based seismic assessment were applied. A critical discussion and comparison of the results of the two methods is presented to rationally appraise limits and opportunities. In particular, flexural and twisting out‐of‐plane mechanisms were clearly appraised in the dynamic field, whereas NSPs were not always able to describe the collapse, because they missed the partial failures determined by higher vibration modes, as could be expected. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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This discussion is based on the paper by Lu et al. (2013) [1]. In this paper, the authors have presented a theoretical study on the PS testing based on the ray path theory and the elastodynamic finite integration technique. This discussion offers some comments on the proposed method for determining the pile length, the ray path of the first P wave arrival for PS testing and analysis results of that paper under discussion. 相似文献
16.
Performance‐based design methodology is based on reaching performance objectives that are associated to certain damage conditions. These performance objectives are related to the seismic hazard and to the performance levels. In actual application, reliable tools are required for capturing the evolution of the damage condition as well as for measuring and locating it. Moreover, it is essential to accurately establish the relationship between the damage and the performance levels. This paper shows the application of damage mechanics to performance‐based design. A layered damage mechanics‐based finite element program is presented with a discussion on modeling for prediction of the response of normal‐strength and high‐strength concrete columns subjected to cyclic flexural loading and various axial load levels. The damage indices derived from these analyses were used to elaborate several damage charts expressed as a function of drift and displacement ductility. This makes it possible to establish a relationship between the damage state and the performance levels. Results have demonstrated the ability of the damage mechanics modeling to accurately predict the behavior of the specimens tested. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
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Grey S. Nearing Yudong Tian Hoshin V. Gupta Martyn P. Clark Kenneth W. Harrison Steven V. Weijs 《水文科学杂志》2016,61(9):1666-1678
ABSTRACTUncertainty is an epistemological concept in the sense that any meaningful understanding of uncertainty requires a theory of knowledge. Therefore, uncertainty resulting from scientific endeavors can only be properly understood in the context of a well-defined philosophy of science. Our main message here is that much of the discussion about uncertainty in hydrology has lacked grounding in these foundational concepts, and has resulted in a controversy that is largely the product of logical errors rather than true (axiomatic) disagreement. As an example, we explore the current debate about the appropriate role of probability theory for hydrological uncertainty quantification. Our main messages are: (1) apparent (and/or claimed) limitations of probability theory are not actually consequences of that theory, but rather of deeper underlying epistemological (and ontological) issues; (2) questions about the appropriateness of probability theory are only meaningful if posed as questions about our preferred philosophy of science; and (3) questions about uncertainty may often be better posed as questions about available information and information use efficiency. Our purpose here is to discuss how hydrologists might ask more meaningful questions about uncertainty. 相似文献
19.
Experimental study of deformable connection consisting of buckling‐restrained brace and rubber bearings to connect floor system to lateral force resisting system 下载免费PDF全文
下载免费PDF全文 Georgios Tsampras Richard Sause Robert B. Fleischman Jose I. Restrepo 《地震工程与结构动力学》2017,46(8):1287-1305
This paper presents experimental and numerical studies of a full‐scale deformable connection used to connect the floor system of the flexible gravity load resisting system to the stiff lateral force resisting system (LFRS) of an earthquake‐resistant building. The purpose of the deformable connection is to limit the earthquake‐induced horizontal inertia force transferred from the floor system to the LFRS and, thereby, to reduce the horizontal floor accelerations and the forces in the LFRS. The deformable connection that was studied consists of a buckling‐restrained brace (BRB) and steel‐reinforced laminated low‐damping rubber bearings (RB). The test results show that the force–deformation responses of the connection are stable, and the dynamic force responses are larger than the quasi‐static force responses. The BRB+RB force–deformation response depends mainly on the BRB response. A detailed discussion of the BRB experimental force–deformation response is presented. The experimental results show that the maximum plastic deformation range controls the isotropic hardening of the BRB. The hardened BRB force–deformation responses are used to calculate the overstrength adjustment factors. Details and limitations of a validated, accurate model for the connection force–deformation response are presented. Numerical simulation results for a 12‐story reinforced concrete wall building with deformable connections show the effects of including the RB in the deformable connection and the effect of modeling the BRB isotropic hardening on the building seismic response. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
20.
简述了石化工业区震害特点，并简要分析了该工业区可能发生的震害，根据石化工业区抗震规划的特殊性，给出了石化工业区抗震减灾规划的内容和其自身的抗震规划模式，并提出了今后在该工业区进行抗震规划工作需要进一步研究的问题。 相似文献