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| 1 | 基于增量动力分析法的扬州金奥中心地震易损性研究显示文摘建筑物的地震易损性是指在不同强度地震作用下结构达到或超过某种性能状态的概率。为研究扬州金奥中心这一新建的超高层建筑在强地震动输入下的性能,本文利用有限元软件ANSYS对其建立了弹塑性模型;在选取合适的地震动记录并做归一化处理后,基于增量动力分析法(Incremental Dynamic Analysis,IDA)对结构进行分析并得到了不同性能状态下的结构易损性曲线和损伤概率。结果表明,在高烈度地震作用下,金奥中心的结构失效概率较小且能满足规范规定的三水准设防要求;在7度和8度罕遇地震下,结构的28层为较薄弱楼层,平面角柱的第5层和核心筒剪力墙底部为抗震易损位置,可考虑适当加固。总体而言,扬州金奥中心的主体结构可靠合理,能够满足规范的抗震设防要求。 | 陈冬旭 宋拓 刘荣 吴前昌 | 2023 | 工程抗震与加固改造2023，45，4： | 1 |
| 2 | A new approach for free vibration analysis of a system of elastically interconnected similar rectangular plates显示文摘A new procedure is proposed to ease the analyses of the free vibration of an elastically connected identical plates system with respect to Kirchhoff plate theory.A structure of n parallel,elastically connected rectangular plates is of concern,whereby the motion is explained by a set of n coupled partial differential equations.The method involves a new change in variables to uncouple equations and form an equal system of n decoupled plates,while each is assumed to be elastically connected to the ground.The differential quadrature method is adopted to solve the decoupled equations.To unravel the original system,the inverse transform is applied.Decoupling the equations enables one to solve them based on the solution methods available for a single plate system.This also diminishes the computational costs of such problems.By considering different boundary conditions,a case study is run to present the method and to validate the results with its counterparts,for which excellent agreement is observed.Assessing the influence of dimensionless thickness,aspect ratio,and stiffness coefficients on the frequencies reveals the different effects of them at the low order of dimensionless natural frequencies in comparison with high orders and for different boundary conditions. | E.Heidari A.Ariaei | 2022 | Earthquake Engineering and Engineering Vibration2022，21，4： | 0 |
| 3 | Finite element analysis of an all-steel buckling-restrained brace显示文摘Typical all-steel buckling-restrained braces(BRBs)usually exhibit obvious local buckling,which is attributed to the lack of longitudinal restraint to the rectangle core plate.To address this issue,all-steel BRBs are proposed,in which two T-shaped steel plates are adopted as the minor restraint elements to restrain the core plate instead of infilled concrete or mortar.In order to investigate the factors that characterize the hysterical responses of this device,different finite element(FE)models are developed for the specific context.The FE models are developed based on nonlinear finite element software,which incorporate continuum(shell or brick)elements,large displacement,and deformation formulations.In these FE models,two different steel constitutive models are adopted to precisely reproduce the cyclic response of the BRB component.Meanwhile,comparisons between the numerical and experimental results are conducted to validate the effectiveness and accuracy of the robust FE model.The agreements between experimental observations and numerical predictions demonstrate that the FE method could be utilized for in depth parametric analysis.Furthermore,BRBs with detailed configurations can provide excellent hysteretic behavior and seismic performance through the optimal design process. | Jiang Tao Dai Junwu Yang Yongqiang Bai Wen Pang Hui Liu Rongheng | 2022 | Earthquake Engineering and Engineering Vibration2022，21，4： | 0 |
| 4 | Effect of the spectral shape of ground motion records on the collapse fragility assessment of degrading SDOF systems显示文摘The main purpose of this paper is to study the collapse capacity of single degree of freedom(SDOF)systems and to produce fragility curves as well as collapse capacity spectra while considering a broad range of structural parameters,including system degradation,the P-Δeffect,ductility capacity and the post-capping stiffness ratio.The modified Ibarra-Krawinkler deterioration model was used to consider hysteretic behavior.A comprehensive study was conducted to extract the collapse capacity spectrum of SDOF systems with a wide range of periods,varying from 0.05 to 4 s,to cover short,intermediate and long periods.Incremental dynamic analysis(IDA)was performed for SDOF systems to identify the condition in which the collapse capacity of the system is determined.The IDAs were performed using different sets of seismic ground motions.The ground motion records were categorized into different sets based on three spectral shape parameters,including the epsilon,SaRatio and N_(p).The collapse fragility curves of SDOF systems with different periods were extracted to illustrate the collapse capacity at different probability levels.The results show that structural degradation and ductility as well as the spectral shape parameters significantly affect the collapse capacity of SDOF systems.On the other hand,the post-capping stiffness ratio and small levels of the P-Δeffect do not remarkably change collapse capacity.Also,the collapse capacity of SDOF systems is more sensitive to the records categorized based on SaRatio and N_(p)than those classified based on epsilon. | Amin Norouzi Mehdi Poursha | 2021 | Earthquake Engineering and Engineering Vibration2021，20，4： | 0 |
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