Earthquake Engineering & Structural Dynamics最新文献

{"title":"Seismically Isolated Nuclear Power Plants: Is Soil–Structure-Interaction Analysis Needed?","authors":"Kaivalya M. Lal,&nbsp;Andrew S. Whittaker,&nbsp;Shahriar Vahdani,&nbsp;Benjamin D. Kosbab,&nbsp;Koroush Shirvan","doi":"10.1002/eqe.4373","DOIUrl":"https://doi.org/10.1002/eqe.4373","url":null,"abstract":"<div>\u0000 \u0000 <p>This study assesses the need for soil–structure interaction (SSI) analysis of surface- or near-surface mounted, seismically isolated nuclear power plants (NPPs). The current rules and guidance for SSI analysis of NPPs are based on the legacy assumption that reactor buildings are stiff and heavy: the two key attributes needed for significant SSI on soil sites. Reactor developers in the United States are considering seismic isolation as a design feature to reduce the impact of the seismic load case and to enable standardization. The substantial reduction in lateral stiffness associated with the introduction of horizontally flexible isolators at the base of a reactor building led to the hypothesis that SSI has no meaningful effect on seismic acceleration and displacement demands on structural components and equipment in surface- or near-surface-founded, base-isolated NPPs. Herein, reactor buildings and their safety-class equipment, the supporting soil domains, and nonlinear isolation systems are explicitly modeled and analyzed to judge whether the hypothesis is correct. An extensive set of response-history analyses was performed for 945 combinations of (1) three fundamentally different, surface mounted reactor buildings, (2) five horizontal isolation systems with a range of linear and bilinear properties, (3) nine seismic inputs covering a range of frequencies and amplitudes of shaking, and (4) seven generic soil profiles that cover a range of sites across the United States and were a part of the Design Certification Documents that enabled the KEPCO APR1400 to be certified for use by the United States Nuclear Regulatory Commission under the 10CFR Part 52 licensing framework. The peak resultant horizontal displacements of the isolation systems, peak resultant horizontal accelerations in each reactor building, and in-structure horizontal and vertical acceleration response spectra were essentially identical with and without considerations of SSI, confirming the hypothesis.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 10","pages":"2601-2620"},"PeriodicalIF":4.3,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624895","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}

{"title":"Experimental Study on a Subwavelength Auxetic Pile-Type Metamaterial for Seismic Wave Attenuation","authors":"Hsiang-Hao Hsieh,&nbsp;Chih-Fan Yang,&nbsp;Tung-Yu Wu,&nbsp;Shiang-Jung Wang,&nbsp;Kuo-Chun Chang","doi":"10.1002/eqe.4381","DOIUrl":"https://doi.org/10.1002/eqe.4381","url":null,"abstract":"<div>\u0000 \u0000 <p>Seismic metamaterials are an innovative passive control technology for regionally mitigating earthquake disasters. They are conceptualized from the perspective of phononic crystals, manipulating wave propagation mainly through two mechanisms—Bragg scattering and local resonance. By adopting the local resonance mechanism, this research aims to ameliorate typical pile-type seismic metamaterials through integrating them with auxetic structures to enhance resonant behavior and obtain more suitable omnidirectional band gaps for earthquake engineering applications. The unique characteristics of auxetic structures enable the fulfillment of an ultralow frequency band gap with an impressive bandwidth, even while maintaining an excellent energy attenuation effect. It theoretically and experimentally demonstrates that the propagation of primary waves can be controlled artificially using periodic auxetic seismic metamaterial barriers. The acceleration response and energy flow are examined using one-fifteenth scaled experiments and corresponding three-dimensional numerical models to assess the transmission spectrum and the energy dissipation mechanism of periodic auxetic seismic metamaterial barriers. The results reveal that the attenuation zone matches the theoretical band gap very well, and the proposed seismic metamaterial exhibits clear local resonance wave modes, as evidenced by kinetic energy distribution analysis. A parametric analysis of row numbers of seismic metamaterials is also conducted to attest that periodic arrangement is essential for exerting the expected properties of band gaps. To sum up, in this study, a novel three-dimensional seismic metamaterial, composed of an auxetic structure and concrete block, is first proposed, and its feasibility and practicality are directly validated through numerical simulations and physical experiments, making it a promising solution for designing seismic metamaterials in practice.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 10","pages":"2586-2600"},"PeriodicalIF":4.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624801","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}

{"title":"Seismic Design of Steel Chevron and Split-X Concentrically Braced Frames","authors":"Bardia Mahmoudi,&nbsp;Ali Imanpour","doi":"10.1002/eqe.4372","DOIUrl":"https://doi.org/10.1002/eqe.4372","url":null,"abstract":"<p>This paper aims to (1) investigate how various design parameters affect seismic response of steel chevron and split-X braced frames, (2) advance understanding of their seismic behaviour and (3) propose new system-specific guidelines for accurately estimating their seismic demands and for achieving enhanced seismic performance. Initially, 12 frames are selected and designed in accordance with Canadian design provisions. Frames are numerically modelled with a fibre-based technique, and nonlinear response history analysis is performed to evaluate the effect of key design parameters on their seismic behaviour, including drift response, beam deflection, brace axial force, column moment demand and beam yielding. Subsequently, 380 additional frames are generated by adjusting the brace cross-sections of the initial set. These frames are then dynamically analysed to develop mathematical expressions capable of predicting column flexural demands and identifying the location of drift concentration. Furthermore, design recommendations are proposed based on the results of dynamic analyses for accurately estimating beam demands in split-X braced frames and in chevron braced frames with elastic and yielding beams.</p>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 10","pages":"2565-2585"},"PeriodicalIF":4.3,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eqe.4372","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Probabilistic Seismic Displacement Hazard Analysis of Earth Slopes With Shallow and Deep Sliding Surfaces","authors":"Jian Song,&nbsp;Wenmiao Mao,&nbsp;Sheng Zhang,&nbsp;Yufeng Gao","doi":"10.1002/eqe.4384","DOIUrl":"https://doi.org/10.1002/eqe.4384","url":null,"abstract":"<div>\u0000 \u0000 <p>The earthquake-induced permanent sliding displacement along the slip surface is generally used to evaluate the seismic performance of earth slopes. This paper presents a probabilistic framework for assessing seismic displacements of slopes with multiple sliding surfaces. The new product of this analysis is a hazard surface of the joint annual rate of exceedance for a range of displacement levels associated with both shallow and deep sliding surfaces. The coupling effects of the sliding response at different slip surfaces are incorporated based on a developed seismic sliding analysis model. Three examples of hypothetical slope models with different yield coefficients are analyzed. The results are presented in terms of both joint hazard surfaces and the marginal hazard curves and are compared with those from the single-sliding analysis. The proposed framework provides a comprehensive characterization of seismic displacement hazard for slopes with multiple sliding mechanism, and hence allows for a more complete performance-based seismic design of these types of complex earth slopes.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 10","pages":"2556-2564"},"PeriodicalIF":4.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624875","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}

{"title":"Seismic Analyses of Rocking Bridges Considering Vehicle-Bridge Interaction","authors":"Chi Huang,&nbsp;Jianian Wen,&nbsp;Yazhou Xie,&nbsp;Zhenlei Jia,&nbsp;Qiang Han,&nbsp;Xiuli Du","doi":"10.1002/eqe.4380","DOIUrl":"https://doi.org/10.1002/eqe.4380","url":null,"abstract":"<div>\u0000 \u0000 <p>Rocking piers have attracted increasing attention due to their promise to simultaneously reduce structural damage and residual displacement of the bridge during seismic shaking. However, the literature lacks a thorough investigation of the system rocking behavior when taking into account the vertical vibration of the deck and the presence of vehicles on the bridge. This study derives an advanced analytical model to fill this research gap. A vehicle model represented by a mass-spring-damping system is adopted to derive the dynamics equilibrium of the vehicle-bridge system (VRB). The derivation is followed by coupling the system's rocking motion through the examination of rocking kinematics, initiation criterion, and energy dissipations during impacts. The analytical model investigates the rocking spectra and overturning stability of the VRB system under different vehicle masses, speeds, and vertical frequencies. It evaluates bridge responses under (1) Ricker wavelets representing pulse-type excitations and (2) recorded spectrally equivalent long- and short-duration ground motions. Results indicate that the pulse effects on the rocking response depend on its excitation frequency and type (i.e., symmetric vs. antisymmetric). Long-duration seismic effect can significantly amplify or reduce the seismic responses of both piers and vehicles, although it has a minor effect on these responses on average. Conversely, heavier vehicles can mitigate the rigid-body-like displacement of the deck, while increasing its elastic deformation. In turn, bridge rocking also affects vehicle responses in vertical and driving directions, which will impair driving comfort and safety, and increase the potential risk of vehicle collision.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 10","pages":"2536-2555"},"PeriodicalIF":4.3,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624776","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}

{"title":"Determination of Importance Factors in Seismic Design for an RC Bridge Pier Considering the Damage Control Under Mainshock–Aftershock Sequences","authors":"Lorddy Zefanya Nugroho,&nbsp;Chien-Kuo Chiu,&nbsp;Mitsuyoshi Akiyama","doi":"10.1002/eqe.4374","DOIUrl":"https://doi.org/10.1002/eqe.4374","url":null,"abstract":"<div>\u0000 \u0000 <p>The importance factor is defined in codes for earthquake-resistant design based on the functionality of bridges, and does not account for damage accumulation due to aftershocks. This study presents a novel approach by introducing the Bridge Aftershock Adjustment Importance Factor (<i>AIF</i>), which serves as a modification to current seismic design codes, specifically addressing the effects associated with aftershocks. A spectrum of <i>AIF</i> values can be established to accommodate various design scenarios. Using the ductility seismic design of a reinforced concrete (RC) bridge pier as an example, this study examines the relationship between the <i>AIF</i>, the scaling intensity of the aftershock <i>SF₁</i>, the ductility capacity <i>µ_mon</i>, and the equivalent height of the bridge pier <i>H_b</i>. The Modified Equivalent Linearization Method (MELM) is employed to estimate the maximum deformation of an equivalent bridge pier system under a specified seismic sequence, which consist of one mainshock followed by three aftershocks, under near-field (NF) or far-field (FF) ground motions. Results indicate that the <i>AIF</i> effectively adjusts the seismic design level of bridges to meet design targets. For an RC bridge pier in Taiwan, with an allowable damage index set at 0.4, the <i>AIF</i> ranges from 1.5 to 2.3 for NF ground motions and from 1.1 to 2.0 for FF ground motions. Furthermore, this study introduces an equation that incorporates the <i>AIF</i>, <i>SF₁</i>, <i>µ_mon</i>, and <i>H_b</i>, enabling engineers to adjust the base shear in seismic design for bridges accordingly. The proposed method offers valuable guidance for adjusting the seismic design level of bridges based on aftershock effects.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 10","pages":"2523-2535"},"PeriodicalIF":4.3,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624792","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}

{"title":"Plastic Hinge Length of RC Shear Walls: A Mechanical Approach Considering Plane Bending and Tension Shift","authors":"Harald Schuler,&nbsp;Arthur Pröbsting","doi":"10.1002/eqe.4375","DOIUrl":"https://doi.org/10.1002/eqe.4375","url":null,"abstract":"<p>Shear walls are often used to stabilize buildings or bridges against horizontal loads like wind or earthquakes. In earthquake design, ductile behavior is usually targeted so that the energy from earthquake excitation can be dissipated. An approach employing a plastic hinge on the wall base is widely used. The length of the plastic hinge is decisive for the rotational capacity, and thus for the ductility of a wall. Due to the complicated behavior of reinforced concrete under cyclic loading, one finds almost only empirical approaches in literature and design regulations to determine the plastic hinge length. The plastic hinge length is influenced by the moment gradient and the shift of tensile forces along the tensile chord. This phenomenon, known as the “tension shift,” is due to the interaction between bending and shear, resulting in inclined cracking. This article separates the tension shift and plane section bending contributions to the plastic hinge length, which are not clearly separated or sufficiently accounted for in empirical approaches. The aim is to allow calculation of displacements resulting from the tension shift in addition to known flexural displacements derived from the moment–curvature relationship under the assumption of plane section bending. Therefore, the tension shift length was measured on several existing shear wall experiments and in a parametric study performed with a nonlinear finite element analysis. Finally, a design approach is proposed with an estimation of the shift angle, which is used to calculate the part of the plastic hinge length due to tension shift. The approach is applicable to both existing walls with small reinforcement amounts and new ductile earthquake walls.</p>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 10","pages":"2509-2522"},"PeriodicalIF":4.3,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eqe.4375","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Innovative Large-Scale Building Specimen Designs to Maximize Shake Table Testing Outcomes","authors":"Robert B. Fleischman,&nbsp;Jose I. Restrepo,&nbsp;Dichuan Zhang,&nbsp;Richard Sause","doi":"10.1002/eqe.4366","DOIUrl":"https://doi.org/10.1002/eqe.4366","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents the innovative engineering designs of the large-scale shake table specimens for two research projects using the NEES/NHERI@UCSD Large Outdoor Shake Table. The first test building is a three-story diaphragm-sensitive precast structure; the second is a four-story flat plate reinforced concrete structure possessing a novel low-damage seismic system; both structures were constructed at half-scale. Each shake table test program was part of a larger research project involving nominally the same multi-university research team: the Diaphragm Seismic Design Methodology (DSDM) project tasked with developing a new seismic design methodology for precast concrete floor diaphragms; the Inertial Force-Limiting Floor Anchorage System (IFAS) project, which aimed to develop a new low-damage seismic system via a deformable floor connection. Both projects adopted an integration of component physical testing and analytical simulation to develop new knowledge on their research topic and utilized a large-scale shake table test near the project's conclusion to serve as a demonstration and calibration tool. A common theme of these shake table test programs, and the focus of this paper, is the innovative designs of the test structures to maximize the outcomes and value of the test programs by: (1) overcoming testing limitations and extend testing capabilities; (2) testing realistic building structures that better reproduce actual conditions; (3) creating a repeated-use test structure that permits evaluation of multiple design parameters at multiple hazard levels or comparison of two distinct systems; and (4) ensuring safety throughout the entire test program. The required engineering design decisions were inextricably linked to the research objectives. At the scale required for the test buildings, the research team faced challenges in design, component production, erection, and demolition. The performance of these engineering features is presented, and lessons learned are provided. The objective of this paper is to document the engineering innovations underlying these successful shake table test programs to serve as a resource for the earthquake engineering research community planning future large shake table tests.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 10","pages":"2483-2508"},"PeriodicalIF":4.3,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624635","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}

{"title":"Investigation on the Calibration of Numerical Models for Cast Steel Replaceable Modular Yielding Links in Steel Eccentrically Braced Frames","authors":"Hongzhou Zhang,&nbsp;Pedram Mortazavi","doi":"10.1002/eqe.4369","DOIUrl":"https://doi.org/10.1002/eqe.4369","url":null,"abstract":"<p>A new generation of yielding links, referred to as cast steel replaceable modular yielding links (CMLs), was recently validated through extensive large-scale testing, to enhance the seismic performance of steel eccentrically braced frames (EBFs). The effective use of CMLs relies on accurately evaluating the seismic response of the EBF systems, which requires robust calibration of the hysteretic model that simulates the nonlinear behavior of CMLs. Calibration relevance (CR) is a recently developed metric to evaluate the effectiveness of calibration methods for hysteretic models in structural seismic analysis. This study aims to use CR evaluation to examine various calibration methods for CMLs, to understand the impact of different aspects in calibration and to offer recommendations for robust CML model calibration. The CR evaluation is conducted on two prototype EBF buildings with two and four stories. Two modeling approaches of CML with different fidelities are considered for the reference and simulation cases in the CR framework. Four quantification methods for calibration error, which serve as objective functions in optimizing hysteretic model parameters, are investigated. Additionally, both standardized and more realistic loading histories (LHs) are considered. For the hysteretic model that is used, it is found that LHs featuring smaller peak link rotations, ranging from 0.03 to 0.07 radians, lead to more accurate calibration overall. The reasoning for this observation is the limitation of the hysteretic models, which is explained in detail at the end.</p>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 10","pages":"2433-2452"},"PeriodicalIF":4.3,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eqe.4369","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling Nonlinear Cyclic Load–Deformation Response of Corrosion-Damaged Reinforced Concrete Columns","authors":"Yewon Park,&nbsp;Chang Seok Lee,&nbsp;Jong-Su Jeon","doi":"10.1002/eqe.4370","DOIUrl":"https://doi.org/10.1002/eqe.4370","url":null,"abstract":"<p>This study presents a lumped plasticity modeling method for simulating the nonlinear load–deformation response of corroded reinforced concrete (RC) columns with rectangular and circular cross-sections. The proposed modeling method utilizes an extended column database to enhance the robustness of the database and considers cyclic degradation. An extensive database of 138 rectangular and 25 circular corroded RC column specimens was constructed to calibrate the model parameters. Subsequently, semi-empirical predictive equations were developed using multiple linear regression analysis for estimating the model parameters, including the corrosion level and column design parameters. The proposed predictive equations were validated against experimental data and showed better accuracy than those of the existing models in terms of strength and initial stiffness. The seismic collapse capacity of the bridge and seismic demand of bridge columns were investigated as an application of the proposed modeling method to an RC bridge system with various corrosion levels. Incremental dynamic analysis results revealed about 46% reduction in the collapse capacity for the bridge with columns that have a 30% corrosion level compared to that with uncorroded columns. Owing to the monotonic and cyclic strength degradation, the proposed lumped plasticity model achieved higher seismic drift demands of columns compared to that obtained using the distributed plasticity model. Further, the seismic drift demands of columns modeled by the proposed method showed a 1.13–1.26 times stronger relationship with corrosion compared to that of the distributed plasticity model.</p>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 10","pages":"2453-2482"},"PeriodicalIF":4.3,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eqe.4370","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}