Earthquake Engineering and Engineering Vibration最新文献_第4页

Effect of trigger system on experimental dispersion characteristics of active surface wave testing 触发系统对主动表面波测试实验频散特性的影响

IF 2.8 2区工程技术

Earthquake Engineering and Engineering Vibration Pub Date : 2024-04-19 DOI: 10.1007/s11803-024-2237-9

Shibin Lin, Jeramy C. Ashlock, Liming Zhu, Zexiang Qin, Bo Li, Xingji Zhu, Changhai Zhai

{"title":"Effect of trigger system on experimental dispersion characteristics of active surface wave testing","authors":"Shibin Lin, Jeramy C. Ashlock, Liming Zhu, Zexiang Qin, Bo Li, Xingji Zhu, Changhai Zhai","doi":"10.1007/s11803-024-2237-9","DOIUrl":"https://doi.org/10.1007/s11803-024-2237-9","url":null,"abstract":"A trigger system is typically employed in active seismic testing to trigger and synchronize multichannel surface wave data acquisition. The effect of the trigger system on the dispersion image of surface waves is empirically known to be negligible, however, theoretical explanation regarding the effect of the trigger system is insufficient. This study systematically examines the theory for surface wave dispersion analysis and proves that the effect of the trigger system on a dispersion image is negligible via a solid theoretical explanation. Subsequently, based on the new theoretical explanation, an alternative method that uses only the relative phase difference between sensors to extract dispersion characteristics with better conceptual clarity is proposed. Two active surface wave testing cases are considered to validate the theory and method. The results indicate that (1) an accurate trigger system is not necessary for surface wave data acquisition, and (2) it is unnecessary to assume that the impact point is the generation point of the surface waves for the experimental dispersion analysis.","PeriodicalId":11416,"journal":{"name":"Earthquake Engineering and Engineering Vibration","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140630642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identification of earthquake induced structural damage based on synchroextracting transform 基于同步提取变换的地震引起的结构破坏识别

IF 2.8 2区工程技术

Earthquake Engineering and Engineering Vibration Pub Date : 2024-04-19 DOI: 10.1007/s11803-024-2249-5

Kumar Roshan, Kumar Gaurav, Zhao Wei, Arvind R. Yadav, Yu Gang, Jayendra Kumar, Evans Amponsah

引用次数: 0

Seismic control of multi-degrees-of-freedom structures by vertical mass isolation method using MR dampers 利用 MR 阻尼器的垂直质量隔离法实现多自由度结构的抗震控制

IF 2.8 2区工程技术

Earthquake Engineering and Engineering Vibration Pub Date : 2024-04-19 DOI: 10.1007/s11803-024-2251-y

Mohamad Shahrokh Abdi, Masoud Nekooei, Mohammad-Ali Jafari

{"title":"Seismic control of multi-degrees-of-freedom structures by vertical mass isolation method using MR dampers","authors":"Mohamad Shahrokh Abdi, Masoud Nekooei, Mohammad-Ali Jafari","doi":"10.1007/s11803-024-2251-y","DOIUrl":"https://doi.org/10.1007/s11803-024-2251-y","url":null,"abstract":"Vertical mass isolation (VMI) is one of the novel methods for the seismic control of structures. In this method, the entire structure is assumed to consist of two mass and stiffness subsystems, and an isolated layer is located among them. In this study, the magnetorheological damper in three modes: passive-off, passive-on, and semi-active mode with variable voltage between zero and 9 volts was used as an isolated layer between two subsystems. Multi-degrees-of-freedom structures with 5, 10, and 15 floors in two dimensions were examined under 11 pairs of near field earthquakes. On each level, the displacement of MR dampers was taken into account. The responses of maximum displacement, maximum inter-story drift, and maximum base shear in controlled and uncontrolled buildings were compared to assess the suggested approach for seismic control of the structures. According to the results, the semi-active control method can reduce the response by more than 12% compared to the uncontrolled mode in terms of maximum displacement of the mass subsystem of the structures. This method can reduce more than 16% and 20% of the responses compared to the uncontrolled mode in terms of maximum inter-story drift and base shear of the structure, respectively.","PeriodicalId":11416,"journal":{"name":"Earthquake Engineering and Engineering Vibration","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140630776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Auto-parametric resonance of a continuous-beam-bridge model under two-point periodic excitation: an experimental investigation and stability analysis 两点周期激励下连续梁桥模型的自动参数共振：实验研究与稳定性分析

IF 2.8 2区工程技术

Earthquake Engineering and Engineering Vibration Pub Date : 2024-04-19 DOI: 10.1007/s11803-024-2247-7

Yuchun Li, Chao Shen, Wei Liu, Dong Li

{"title":"Auto-parametric resonance of a continuous-beam-bridge model under two-point periodic excitation: an experimental investigation and stability analysis","authors":"Yuchun Li, Chao Shen, Wei Liu, Dong Li","doi":"10.1007/s11803-024-2247-7","DOIUrl":"https://doi.org/10.1007/s11803-024-2247-7","url":null,"abstract":"The auto-parametric resonance of a continuous-beam bridge model subjected to a two-point periodic excitation is experimentally and numerically investigated in this study. An auto-parametric resonance experiment of the test model is conducted to observe and measure the auto-parametric resonance of a continuous beam under a two-point excitation on columns. The parametric vibration equation is established for the test model using the finite-element method. The auto-parametric resonance stability of the structure is analyzed by using Newmark’s method and the energy-growth exponent method. The effects of the phase difference of the two-point excitation on the stability boundaries of auto-parametric resonance are studied for the test model. Compared with the experiment, the numerical instability predictions of auto-parametric resonance are consistent with the test phenomena, and the numerical stability boundaries of auto-parametric resonance agree with the experimental ones. For a continuous beam bridge, when the ratio of multipoint excitation frequency (applied to the columns) to natural frequency of the continuous girder is approximately equal to 2, the continuous beam may undergo a strong auto-parametric resonance. Combined with the present experiment and analysis, a hypothesis of Volgograd Bridge’s serpentine vibration is discussed.","PeriodicalId":11416,"journal":{"name":"Earthquake Engineering and Engineering Vibration","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140623761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel mitigation measure for normal fault-induced deformations on pile-raft systems 针对桩-筏系统正常故障引起的变形的新型缓解措施

IF 2.8 2区工程技术

Earthquake Engineering and Engineering Vibration Pub Date : 2024-01-24 DOI: 10.1007/s11803-024-2225-0

Mohammadreza Jahanshahi Nowkandeh, Mehdi Ashtiani

{"title":"A novel mitigation measure for normal fault-induced deformations on pile-raft systems","authors":"Mohammadreza Jahanshahi Nowkandeh, Mehdi Ashtiani","doi":"10.1007/s11803-024-2225-0","DOIUrl":"https://doi.org/10.1007/s11803-024-2225-0","url":null,"abstract":"Evidence from recent earthquakes has shown destructive consequences of fault-induced permanent ground movement on structures. Such observations have increased the demand for improvements in the design of structures that are dramatically vulnerable to surface fault ruptures. In this study a novel connection between the raft and the piles is proposed to mitigate the hazards associated with a normal fault on pile-raft systems by means of 3D finite element (FE) modeling. Before embarking on the parametric study, the strain-softening constitutive law used for numerical modeling of the sand has been validated against centrifuge test results. The exact location of the fix-head and unconnected pile-raft systems relative to the outcropping fault rupture in the free-field is parametrically investigated, revealing different failure mechanisms. The performance of the proposed connection for protecting the pile-raft system against normal fault-induced deformations is assessed by comparing the geotechnical and structural responses of both types of foundation. The results indicate that the pocket connection can relatively reduce the cap rotation and horizontal and vertical displacements of the raft in most scenarios. The proposed connection decreases the bending moment response of the piles to their bending moment capacity, verging on a fault offset of 0.6 m at bedrock.","PeriodicalId":11416,"journal":{"name":"Earthquake Engineering and Engineering Vibration","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139556852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pulses in ground motions identified through surface partial matching and their impact on seismic rocking consequence 通过地表部分匹配确定的地动脉冲及其对地震摇动后果的影响

IF 2.8 2区工程技术

Earthquake Engineering and Engineering Vibration Pub Date : 2024-01-24 DOI: 10.1007/s11803-024-2226-z

Yuchuan Tang, Jiankang Wang, Gang Wu

引用次数: 0

Experimental study on seismic reinforcement of bridge foundation on silty clay landslide with inclined interlayer 倾斜夹层淤泥质粘土滑坡桥梁地基抗震加固试验研究

IF 2.8 2区工程技术

Earthquake Engineering and Engineering Vibration Pub Date : 2024-01-24 DOI: 10.1007/s11803-024-2233-0

Da Lei, Hanmo Xiao, Jianhua Ran, Bin Luo, Guanlu Jiang, Tianlang Xue

{"title":"Experimental study on seismic reinforcement of bridge foundation on silty clay landslide with inclined interlayer","authors":"Da Lei, Hanmo Xiao, Jianhua Ran, Bin Luo, Guanlu Jiang, Tianlang Xue","doi":"10.1007/s11803-024-2233-0","DOIUrl":"https://doi.org/10.1007/s11803-024-2233-0","url":null,"abstract":"A shaking table test for a bridge foundation reinforced by anti-slide piles on a silty clay landslide model with an inclined interlayer was performed. The deformation characteristics of the bridge foundation piles and anti-slide piles were analyzed in different loading conditions. The dynamic response law of a silty clay landslide with an inclined interlayer was summarized. The spacing between the rear anti-slide piles and bridge foundation should be reasonably controlled according to the seismic fortification requirements, to avoid the two peaks in the forced deformation of the bridge foundation piles. The “blocking effect” of the bridge foundation piles reduced the deformation of the forward anti-slide piles. The stress-strain response of silty clay was intensified as the vibration wave field appeared on the slope. Since the vibration intensified, the thrust distribution of the landslide underwent a process of shifting from triangle to inverted trapezoid, the difference in the acceleration response between the bearing platform and silty clay landslide tended to decrease, and the spectrum amplitude near the natural vibration frequency increased. The rear anti-slide piles were able to slow down the shear deformation of the soil in front of the piles and avoid excessive acceleration response of the bridge foundation piles.","PeriodicalId":11416,"journal":{"name":"Earthquake Engineering and Engineering Vibration","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139557040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Time-domain dynamic constitutive model suitable for mucky soil site seismic response 适用于粘性土场地地震响应的时域动力构造模型

IF 2.8 2区工程技术

Earthquake Engineering and Engineering Vibration Pub Date : 2024-01-24 DOI: 10.1007/s11803-024-2222-3

Qing Dong, Su Chen, Liguo Jin, Zhenghua Zhou, Xiaojun Li

{"title":"Time-domain dynamic constitutive model suitable for mucky soil site seismic response","authors":"Qing Dong, Su Chen, Liguo Jin, Zhenghua Zhou, Xiaojun Li","doi":"10.1007/s11803-024-2222-3","DOIUrl":"https://doi.org/10.1007/s11803-024-2222-3","url":null,"abstract":"Soil nonlinear behavior displays noticeable effects on the site seismic response. This study proposes a new functional expression of the skeleton curve to replace the hyperbolic skeleton curve. By integrating shear modulus and combining the dynamic skeleton curve and the damping degradation coefficient, the constitutive equation of the logarithmic dynamic skeleton can be obtained, which considers the damping effect in a soil dynamics problem. Based on the finite difference method and the multi-transmitting boundary condition, a 1D site seismic response analysis program called Soilresp1D has been developed herein and used to analyze the time-domain seismic response in three types of sites. At the same time, this study also provides numerical simulation results based on the hyperbolic constitutive model and the equivalent linear method. The results verify the rationality of the new soil dynamic constitutive model. It can analyze the mucky soil site nonlinear seismic response, reflecting the deformation characteristics and damping effect of the silty soil. The hysteresis loop area is more extensive, and the residual strain is evident.","PeriodicalId":11416,"journal":{"name":"Earthquake Engineering and Engineering Vibration","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139556853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seismic safety assessment with non-Gaussian random processes for train-bridge coupled systems 使用非高斯随机过程对火车-桥梁耦合系统进行地震安全评估

IF 2.8 2区工程技术

Earthquake Engineering and Engineering Vibration Pub Date : 2024-01-24 DOI: 10.1007/s11803-024-2235-y

Han Zhao, Lei Gao, Biao Wei, Jincheng Tan, Peidong Guo, Lizhong Jiang, Ping Xiang

{"title":"Seismic safety assessment with non-Gaussian random processes for train-bridge coupled systems","authors":"Han Zhao, Lei Gao, Biao Wei, Jincheng Tan, Peidong Guo, Lizhong Jiang, Ping Xiang","doi":"10.1007/s11803-024-2235-y","DOIUrl":"https://doi.org/10.1007/s11803-024-2235-y","url":null,"abstract":"Extensive high-speed railway (HSR) network resembled the intricate vascular system of the human body, crisscrossing mainlands. Seismic events, known for their unpredictability, pose a significant threat to both trains and bridges, given the HSR’s extended operational duration. Therefore, ensuring the running safety of train-bridge coupled (TBC) system, primarily composed of simply supported beam bridges, is paramount. Traditional methods like the Monte Carlo method fall short in analyzing this intricate system efficiently. Instead, efficient algorithm like the new point estimate method combined with moment expansion approximation (NPEM-MEA) is applied to study random responses of numerical simulation TBC systems. Validation of the NPEM-MEA’s feasibility is conducted using the Monte Carlo method. Comparative analysis confirms the accuracy and efficiency of the method, with a recommended truncation order of four to six for the NPEM-MEA. Additionally, the influences of seismic magnitude and epicentral distance are discussed based on the random dynamic responses in the TBC system. This methodology not only facilitates seismic safety assessments for TBC systems but also contributes to standard-setting for these systems under earthquake conditions.","PeriodicalId":11416,"journal":{"name":"Earthquake Engineering and Engineering Vibration","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139556868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on a conical bearing for acceleration-sensitive equipment 用于加速度敏感设备的锥形轴承研究

IF 2.8 2区工程技术

Earthquake Engineering and Engineering Vibration Pub Date : 2024-01-24 DOI: 10.1007/s11803-024-2230-3

Hui Pang, Wen Xu, Junwu Dai, Tao Jiang

{"title":"Study on a conical bearing for acceleration-sensitive equipment","authors":"Hui Pang, Wen Xu, Junwu Dai, Tao Jiang","doi":"10.1007/s11803-024-2230-3","DOIUrl":"https://doi.org/10.1007/s11803-024-2230-3","url":null,"abstract":"Seismic isolation effectively reduces seismic demands on building structures by isolating the superstructure from ground vibrations during earthquakes. However, isolation strategies give less attention to acceleration-sensitive systems or equipment. Meanwhile, as the isolation layer’s displacement grows, the stiffness and frequency of traditional rolling and sliding isolation bearings increases, potentially causing self-centering and resonance concerns. As a result, a new conical pendulum bearing has been selected for acceleration-sensitive equipment to increase self-centering capacity, and additional viscous dampers are incorporated to enhance system damping. Moreover, the theoretical formula for conical pendulum bearings is supplied to analyze the device’s dynamic parameters, and shake table experiments are used to determine the proposed device’s isolation efficiency under various conditions. According to the test results, the newly proposed devices have remarkable isolation performance in terms of minimizing both acceleration and displacement responses. Finally, a numerical model of the isolation system is provided for further research, and the accuracy is demonstrated by the aforementioned experiments.","PeriodicalId":11416,"journal":{"name":"Earthquake Engineering and Engineering Vibration","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139557045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0