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Seismic performance evaluation of steel frame-steel plate shear walls system based on the capacity spectrum method 被引量:3
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作者 Jian-hua SHAO Qiang GU Yong-kang SHEN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2008年第3期322-329,共8页
This paper presents some methods that the standard acceleration design response spectra derived from the present China code for seismic design of buildings are transformed into the seismic demand spectra, and that the... This paper presents some methods that the standard acceleration design response spectra derived from the present China code for seismic design of buildings are transformed into the seismic demand spectra, and that the base shear force-roof displacement curve of structure is converted to the capacity spectrum of an equivalent single-degree-of-freedom (SDOF) system. The capacity spectrum method (CSM) is programmed by means of MATLABT.0 computer language. A dual lateral force resisting system of 10-story steel frame-steel plate shear walls (SPSW) is designed according to the corresponding China design codes. The base shear force-roof displacement curve of structure subjected to the monotonic increasing lateral inverse triangular load is obtained by applying the equivalent strip model to stimulate SPSW and by using the finite element analysis software SAP2000 to make Pushover analysis. The seismic performance of this dual system subjected to three different conditions, i.e. the 8-intensity frequently occurred earthquake, fortification earthquake and seldom occurred earthquake, is evaluated by CSM program. The excessive safety of steel frame-SPSW system designed according to the present China design codes is pointed out and a new design method is suggested. 展开更多
关键词 Steel frame-steel plate shear walls (SPSW) system capacity spectrum method (CSM) Seismic demand spectrum Base shear force-roof displacement Seismic performance evaluation
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Bearing capacity analysis using the method of characteristics 被引量:1
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作者 Jian-Ping Sun Zhi-Ye Zhao Yi-Pik Cheng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2013年第2期179-188,共10页
Using the method of characteristics,the bearing capacity for a strip footing is analyzed.The method of characteristics leads to an exact true limit load when the calculations of the three terms in the bearing capacity... Using the method of characteristics,the bearing capacity for a strip footing is analyzed.The method of characteristics leads to an exact true limit load when the calculations of the three terms in the bearing capacity formula are consistent with one collapse mechanism and the soil satisfies the associated flow rule.At the same time,the method of characteristics avoids the assumption of arbitrary slip surfaces,and produces zones within which equilibrium and plastic yield are simultaneously satisfied for given boundary stresses.The exact solution without superposition approximation can still be expressed by Terzaghi's equation of bearing capacity,in which the bearing capacity factor N γλ is dependent on the dimensionless parameter λ and the friction angle φ.The influence of groundwater on the bearing capacity of the shallow strip footing is considered,which indicates that when the groundwater effect is taken into account,the error induced by the superposition approximation can be reduced as compared with dry soil condition.The results are presented in the form of charts which give the modified value(Nwγλc /Nγλc) of bearing capacity factor.Finally,an approximated analytical expression,which provides results in close agreement with those obtained by numerical analysis in this paper,has been suggested for practical application purposes. 展开更多
关键词 Bearing capacity·The method of characteristics·Groundwater·Strip footing
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A Quantitative Method for Evaluating the Transporting Capacity of Oil-Source Faults in Shallow Formation of Oil-Rich Sags 被引量:4
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作者 JIANG Youlu ZHAO Kai +1 位作者 LIU Jingdong LU Xueying 《Acta Geologica Sinica(English Edition)》 CAS CSCD 2018年第4期1678-1679,共2页
Objective Oil-source faults have an important effect on reservoir formation and distribution in shallow formations with non- hydrocarbon generation in oil-rich fault-related basins (Jiang Youlu et al., 2015). Howev... Objective Oil-source faults have an important effect on reservoir formation and distribution in shallow formations with non- hydrocarbon generation in oil-rich fault-related basins (Jiang Youlu et al., 2015). However, the fault transporting capacity cannot be evaluated quantitatively at present. Taking the Zhanhua Sag in the Bohai Bay Basin as an example, this work analyzed the factors influencing the transporting capacity of the oil-source faults and proposed a quantitative method for evaluating their transporting capacity. 展开更多
关键词 A Quantitative method for Evaluating the Transporting capacity of Oil-Source Faults in Shallow Formation of Oil-Rich Sags
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Pushover analysis procedure for systems considering SSI effects based on capacity spectrum method
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作者 王凤霞 欧进萍 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2007年第3期269-279,共11页
This paper presents a new procedure to transform an SSI system into an equivalent SDOF system using twice equivalence. A pushover analysis procedure based on the capacity spectrum method for buildings with SSI effects... This paper presents a new procedure to transform an SSI system into an equivalent SDOF system using twice equivalence. A pushover analysis procedure based on the capacity spectrum method for buildings with SSI effects (PASSI) is then established based on the equivalent SDOF system, and the modified response spectrum and equivalent capacity spectrum are obtained. Furthermore, the approximate formulas to obtain the dynamic stiffness of foundations are suggested. Three steel buildings with different story heights (3, 9 and 20) including SSI effects are analyzed under two far-field and two near-field historical records and an artificial seismic time history using the two PASSI procedures and the nonlinear response history analysis (NLhRHA) method. The results are compared and discussed. Finally, combined with seismic design response spectrum, the nonlinear seismic response of a 9-story building with SSI effects is analyzed using the PASSI procedures, and its seismic performance is evaluated according to the Chinese 'Code for Seismic Design of Buildings. The feasibility of the proposed procedure is verified. 展开更多
关键词 pushover analysis procedure soil-structural interaction (SSI) capacity spectrum method equivalent SDOF system nonlinear response history analysis
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An analysis of four methodologies for estimating highway capacity from ITS data
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作者 Zhao Li Rilett Laurence 《Journal of Modern Transportation》 2015年第2期107-118,共12页
With the recent advent of Intelligent Transporta- tion Systems (ITS), and their associated data collection and archiving capabilities, there is now a rich data source for transportation professionals to develop capa... With the recent advent of Intelligent Transporta- tion Systems (ITS), and their associated data collection and archiving capabilities, there is now a rich data source for transportation professionals to develop capacity values for their own jurisdictions. Unfortunately, there is no consensus on the best approach for estimating capacity from ITS data. The motivation of this paper is to compare and contrast four of the most popular capacity estimation techniques in terms of (1) data requirements, (2) modeling effort required, (3) esti- mated parameter values, (4) theoretical background, and (5) statistical differences across time and over geographically dispersed locations. Specifically, the first method is the maximum observed value, the second is a standard funda- mental diagram curve fitting approach using the popular Van Aerde model, the third method uses the breakdown identifi- cation approach, and the fourth method is the survival prob- ability based on product limit method. These four approaches were tested on two test beds: one is located in San Diego, California, U.S., and has data from 112 work days; the other is located in Shanghai, China, and consists of 81 work days. It was found that, irrespective of the estimation methodology and the definition of capacity, the estimated capacity can vary considerably over time. The second finding was that, as ex- pected, the different approaches yielded different capacity results. These estimated capacities varied by as much as 26 % at the San Diego test site and by 34 % at the Shanghai test site. It was also found that each of the methodologies has advantages and disadvantages, and the best method will be the function of the available data, the application, and the goals of the modeler. Consequently, it is critical for users of automatic capacity estimation techniques, which utilize ITS data, to understand the underlying assumptions of each of the different approaches. 展开更多
关键词 capacity estimation method Van Aerdemodel Breakdown identification PLM
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Investigation of Effects of Capacity Spectrum Method on Performance Evaluation of Multi-Story Buildings According to the IRAQI Seismic Code Requirements
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作者 Al-Nuaimi Amer Mohamed Sobaih Akl Adel 《Open Journal of Civil Engineering》 2016年第3期420-441,共22页
The aim of this study is to assess the performance objectives defined in the Iraqi Seismic Code (ISC) in order to make a realistic evaluation related to Performance-Based Seismic Design (PBSD) of multi-story reinforce... The aim of this study is to assess the performance objectives defined in the Iraqi Seismic Code (ISC) in order to make a realistic evaluation related to Performance-Based Seismic Design (PBSD) of multi-story reinforced concrete buildings and also to compare and evaluate structural response demands obtained from nonlinear static analysis procedures according to two versions of the capacity spectrum method (CSM) which are recommended in ATC 40 and ATC 55. Two groups of three-dimensional RC buildings with different heights, designed according to Iraqi Building Code Requirements for Reinforced Concrete (IBC), are investigated. Pushover analyses are carried out to determine the nonlinear behavior of the buildings under three different seismic hazard levels, for two Iraqi seismic zones, of earthquake loads. In order to determine performance levels of the buildings, maximum inter-story drift demands and plasticizing sequence are determined and compared with the related limits using the CSM recommended in ATC 40 and ATC 55. From the results of this research, it can be concluded that RC buildings designed according to the Iraqi codes sufficiently provide the performance objectives stipulated in the ISC. Comparing structural response quantities obtained from the two versions of CSM, effects on performance evaluations of the buildings are investigated comparatively, as well. 展开更多
关键词 Pushover Analysis capacity Spectrum method Seismic capacity Iraq PBSD RC Buildings
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Determination of ultimate bearing capacity of uplift piles using intact and non-intact load−displacement curve 被引量:5
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作者 WANG Qin-ke MAJian-lin +2 位作者 JI Yu-kun ZHANG Jian CHEN Wen-long 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第2期470-485,共16页
Based on the field destructive test of six rock-socketed piles with shallow overburden,three prediction models are used to quantitatively analyze and predict the intact load−displacement curve.The predicted values of ... Based on the field destructive test of six rock-socketed piles with shallow overburden,three prediction models are used to quantitatively analyze and predict the intact load−displacement curve.The predicted values of ultimate uplift capacity were further determined by four methods(displacement controlling method(DCM),reduction coefficient method(RCM),maximum curvature method(MCM),and critical stiffness method(CSM))and compared with the measured value.Through the analysis of the relationship between the change rate of pullout stiffness and displacement,a method used to determine the ultimate uplift capacity via non-intact load−displacement curve was proposed.The results show that the predicted value determined by DCM is more conservative,while the predicted value determined by MCM is larger than the measured value.This suggests that RCM and CSM in engineering applications can be preferentially applied.Moreover,the development law of the change rate of pullout stiffness with displacement agrees well with the attenuation form of power function.The theoretical predicted results of ultimate uplift capacity based on the change rate of pullout stiffness will not be affected by the integrity of the curve.The method is simple and applicable for the piles that are not loaded to failure state,and thus provides new insights into ultimate uplift capacity determination of test piles. 展开更多
关键词 load−displacement curve prediction model determination method of bearing capacity change rate of pullout stiffness
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Study on Atmospheric Environmental Capacity of Shennongjia 被引量:2
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作者 Zhang Wenna Cheng Chang +1 位作者 Chen Tao Jiang Liping 《Meteorological and Environmental Research》 CAS 2014年第9期43-46,共4页
Through analysis and evaluation on status quo of atmospheric environment in Shennongjia,atmospheric environment capacity in ClassII functional area of Shennongjia was counted by A value method. The results showed that... Through analysis and evaluation on status quo of atmospheric environment in Shennongjia,atmospheric environment capacity in ClassII functional area of Shennongjia was counted by A value method. The results showed that atmospheric environment capacities of SO2,NO2 and PM10in Shennongjia Forest District were respectively 6 268. 8,17 666. 2 and 2 279. 5 t / a,much larger than emissions of air pollutants in Shennongjia in 2012. 展开更多
关键词 A value method Atmospheric environmental capacity Shennongjia China
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New matrix method for response analysis of circumferentially stiffened non-circular cylindrical shells under harmonic pressure
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作者 邹时智 黄玉盈 +1 位作者 何锃 向宇 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2007年第10期1397-1405,共9页
Based on the governing equation of vibration of a kind of cylindrical shells written in a matrix differential equation of the first order, a new matrix method is presented for steady-state vibration analysis of a nonc... Based on the governing equation of vibration of a kind of cylindrical shells written in a matrix differential equation of the first order, a new matrix method is presented for steady-state vibration analysis of a noncircular cylindrical shell simply sup- ported at two ends and circumferentially stiffened by rings under harmonic pressure. Its difference from the existing works by Yamada and Irie is that the matrix differential equation is solved by using the extended homogeneous capacity precision integration' approach other than the Runge-Kutta-Gill integration method. The transfer matrix can easily be determined by a high precision integration scheme. In addition, besides the normal interacting forces, which were commonly adopted by researchers earlier, the tangential interacting forces between the cylindrical shell and the rings are considered at the same time by means of the Dirac-δ function. The effects of the exciting frequencies on displacements and stresses responses have been investigated. Numerical results show that the proposed method is more efficient than the aforementioned method. 展开更多
关键词 circumferentially stiffened noncircular cylindrical shell extended homogeneous capacity precision integration method harmonic vibration semianalytical method
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Simplified stiffness-based approach for seismic performance evaluation of moment-resisting frame
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作者 于琦 孟少平 +1 位作者 吴京 孙巍巍 《Journal of Southeast University(English Edition)》 EI CAS 2009年第2期241-246,共6页
Based on the concept of stiffness degradation, a damage index of the whole frame and the storey is proposed for the frame seismic performance evaluation. The index is compatible with the non-linear static analysis (e... Based on the concept of stiffness degradation, a damage index of the whole frame and the storey is proposed for the frame seismic performance evaluation. The index is compatible with the non-linear static analysis (e. g. the pushover analysis), and the structural damage is considered via plastic hinges. Simultaneously, a practical approach is developed to obtain the relationships between the proposed index and earthquake intensities based on the capacity spectrum method. The proposed index is then illustrated through two low-rise reinforced concrete frames, and it is also compared with some other indices. The results indicate that the proposed index is on the safe side and not sensitive to the lateral load pattern. The storey index is helpful to reflect the storey damage and to uncover the position of the weak storey. Finally, the relationship between performance levels and damage index values is also proposed through statistical analysis for the performance-based seismic evaluation. 展开更多
关键词 damage index seismic evaluation capacity spectrum method FRAME lateral load pattern pushover analysis performance level stiffness degradation
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Bearing Behaviors of Stiffened Deep Cement Mixed Pile 被引量:1
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作者 吴迈 赵欣 《Transactions of Tianjin University》 EI CAS 2006年第3期209-214,共6页
A series of investigations were conducted to study the bearing capacity and load transfer mechanism of stiffened deep cement mixed (SDCM) pile. Laboratory tests including six specimens were conducted to investigate ... A series of investigations were conducted to study the bearing capacity and load transfer mechanism of stiffened deep cement mixed (SDCM) pile. Laboratory tests including six specimens were conducted to investigate the frictional resistance between the concrete core and the cementsoil. Two model piles and twenty-four full-scale piles were tested to examine the bearing behavior of single pile. Laboratory and model tests results indicate that the cohesive strength is large enough to ensure the interaction between core pile and the outer cement-soil. The full-scale test results show that the SDCM piles exhibit similar bearing behavior to bored and cast-in-place concrete piles. In general, with the rational composite structure the SDCM piles can transmit the applied load effectively, and due to the addition of the stiffer core, the SDCM piles possess high bearing capacity. Based on the findings of these experimental investigations and theoretical analysi , a practical design method is developed to predict the vertical bearing capacity of SDCM pile. 展开更多
关键词 stiffened deep cement mixed pile bearing capacity load transfer mechanism design method
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Bound analysis of target displacement for seismic performance assessment of buildings
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作者 贾立哲 段忠东 陆钦年 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第1期27-32,共6页
The earthquake demand spectrum is often assumed as the average spectrum in the seismic design code or based upon probabilistic models to take into account the uncertainties of ground motion. The average spectrum can n... The earthquake demand spectrum is often assumed as the average spectrum in the seismic design code or based upon probabilistic models to take into account the uncertainties of ground motion. The average spectrum can not deal with the uncertainty of earthquake excitation. Furthermore, results of probabilistic analysis are suspicious when information describing the uncertainty is inadequate. Considering the uncertainties of peak acceleration of ground motion and characteristic period of response spectra using a double bounded convex set model, the bounds of the design spectrum and the demand spectrum were obtained based on Chinese seismic code. Then the convex analysis method was integrated into the capacity spectrum procedure to study the bound characteristics of target displacement. Finally, the target displacement was derived with an interval, and it is more objective and robust with respect to probabilistic perspective. 展开更多
关键词 convex set model capacity spectrum method UNCERTAINTY
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