Earthquake Engineering & Structural Dynamics最新文献

{"title":"Mitigation of Floating Roof Pounding in Storage Tanks Subjected to Seismic Loads","authors":"Michela Salimbeni,&nbsp;Maurizio De Angelis,&nbsp;Mariano Ciucci","doi":"10.1002/eqe.70044","DOIUrl":"https://doi.org/10.1002/eqe.70044","url":null,"abstract":"<div>\u0000 \u0000 <p>Floating roof tanks, which are utilized in a multitude of industrial facilities for the storage of volatile and flammable products, are particularly susceptible to seismic events. These events can result in substantial structural damage and hazardous material releases due to roof sinking and leading to rim fires. The metallic contact between the floating roof and the tank wall, induced by seismic roof oscillations, has been shown to generate sparks. These sparks, in the presence of flammable vapors, pose a significant risk during seismic events. This study investigates the interaction between the floating roof and the tank walls, with a focus on the role of the sealing system and the pounding dynamics during seismic events. Based on experimental findings of mechanical characterization of a spring in a typical sealing system, with a single-degree-of-freedom system with rigid pounding, the horizontal dynamics of the floating roof under seismic excitation were investigated. Then, a gap and a deformable, dissipative bumper system were designed to control the roof's oscillations and protect the sealing system. Seismic analyses demonstrated that the proposed bumpers significantly reduce the number and contact force of impacts, thereby mitigating the risk of generating sparks during the critical phase of maximum seismic energy. The optimized bumper design was found to be fully compatible with the operational conditions of the case study tank, offering an effective solution to improve the seismic safety of floating roof tanks in seismic-prone areas.</p>\u0000 <p><b>Summary</b>:\u0000\u0000 </p><ul>\u0000 \u0000 <li>Identifies fire hazards from roof-shell pounding in floating roof tanks, an issue overlooked in regulations.</li>\u0000 \u0000 <li>Provides experimental characterization of sealing system stiffness and damping properties.</li>\u0000 \u0000 <li>Demonstrates that conventional sealing systems lead to excessive oscillations and high contact forces (∼10⁴ kN) under seismic excitation, with an SDOF system.</li>\u0000 \u0000 <li>Proposes deformable and dissipative bumpers to control displacements.</li>\u0000 \u0000 <li>Conducts a parametric analysis to optimize bumper stiffness, damping, and gap size.</li>\u0000 \u0000 <li>Confirms, through seismic simulations, that optimized bumpers dissipate energy effectively, minimizing impact velocities and enhancing seismic safety.</li>\u0000 </ul>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 14","pages":"3561-3575"},"PeriodicalIF":5.0,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272991","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":"Shake-Table Tests of a Low-Prestressed Self-Centering Braced Frame","authors":"Yi Xiao,&nbsp;Ying Zhou,&nbsp;Honghao Bai,&nbsp;Wenbo Tian,&nbsp;Marc O. Eberhard,&nbsp;John F. Stanton","doi":"10.1002/eqe.70040","DOIUrl":"https://doi.org/10.1002/eqe.70040","url":null,"abstract":"<div>\u0000 \u0000 <p>Rapid functional recovery and minimal structural damage have become critical objectives in modern seismic design. To address this need, a Low-Prestressed Self-Centering (LPSC) brace was developed, providing reliable re-centering capacity with a low level of prestressing force. This study evaluates its structure-level seismic performance through shake-table tests on a 1/3-scale, two-story LPSC Braced Frame (LPSC-BF). The test building featured hinged column bases with pinned beam-to-column joints in one direction, and rotational-restrained column bases with shear beam-to-column joints in the other. A total of 60 tests, including unidirectional and bidirectional excitations of varying intensities, were conducted. The test building consistently achieved immediate occupancy performance, with plastic deformations confined to the steel dissipaters in the LPSC braces. These steel dissipaters were easily replaceable, enabling rapid post-earthquake repair. Despite a minor loss in prestressing force, the residual drift remained minimal throughout testing. The direction with hinged column bases exhibited a uniform drift distribution, whereas the direction with rotationally restrained bases showed a concentration of drift at the first story. Floor acceleration responses were generally lower than the code-predicted values. Overall, the test results demonstrate that the LPSC-BF is an attractive seismic resilient structural system.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 14","pages":"3541-3560"},"PeriodicalIF":5.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272958","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":"Biaxial Shaking Table Tests on a Full-Scale Single-Story Traditional Greek Stone Masonry and Timber-Framed Composite Structure After Repairs","authors":"Lydia Panoutsopoulou,&nbsp;Charalampos Mouzakis","doi":"10.1002/eqe.70038","DOIUrl":"https://doi.org/10.1002/eqe.70038","url":null,"abstract":"<div>\u0000 \u0000 <p>Repairs were carried out on a full-scale, single-story specimen of a traditional Ottoman-period Greek structure, comprising a stone masonry wall with timber ties and three timber-framed ones with fired clay brick infill, which had been subjected to biaxial shaking table tests. The connection between the walls was enhanced, as was the roof-level diaphragm. The timber-framed walls were clad with plywood panels and the cracks in the stone wall were repaired. The repaired specimen was then subjected to biaxial seismic tests, while its dynamic characteristics before and after seismic testing were determined with sine sweep tests. The repaired specimen safely withstood 22% increased base acceleration (0.44 g compared to 0.36 g for the As-built one), with damages concentrating in the stone wall, while the rocking mechanism of the timber-framed ones changed.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 13","pages":"3494-3510"},"PeriodicalIF":5.0,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101024","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 Behavior of Horizontal-Hole Interlocking Concrete Block-Confined Masonry Walls with Openings","authors":"Zhanjiong Song,&nbsp;Jingshu Zhang,&nbsp;Lei Shuai,&nbsp;Shen Liu,&nbsp;Zheng Wang,&nbsp;Haixing Liu","doi":"10.1002/eqe.70035","DOIUrl":"https://doi.org/10.1002/eqe.70035","url":null,"abstract":"<div>\u0000 \u0000 <p>To study the seismic behavior of horizontal-hole interlocking concrete block-confined masonry walls with openings, in-plane cyclic loading tests were conducted on specimens with no openings, a window opening, and a door opening. The results indicated that the specimens with no openings and window openings exhibited typical diagonal shear failures of the entire wall. However, the structure and bearing mode were changed by including a door opening. The door-opening specimen could no longer be analyzed as an entire confined masonry wall owing to its lateral resistance and failure modes. The tie columns on both sides and the adjacent masonry formed wall columns, and the lintel beam and masonry above the opening formed a wall beam. Under a horizontal force, localized shear failure occurred in the wall beam, which resembled the shear failure of the coupling beam of double-limb shear walls and was an expected failure mode. Finally, this study proposes a new method for analyzing the lateral resistance of confined masonry walls with openings, called the force transmission path method, with a maximum calculated difference of 8.51%. This reflected the lateral resistance contribution of the reinforced concrete lintel beams.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 13","pages":"3442-3456"},"PeriodicalIF":5.0,"publicationDate":"2025-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101002","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 Responses of Elastic Single-Degree-of-Freedom Oscillators Fixed on Controlled Rocking Isolation Systems with Flag-Shaped Hysteresis","authors":"Lizi Cheng,&nbsp;Canxing Qiu,&nbsp;Xiuli Du","doi":"10.1002/eqe.70034","DOIUrl":"https://doi.org/10.1002/eqe.70034","url":null,"abstract":"<div>\u0000 \u0000 <p>Free rocking isolation systems (FRIS), characterized by negative post-uplift stiffness, have demonstrated favorable seismic performance such as resonance avoidance and gravity-driven self-centering (SC); however, a key design challenge lies in simultaneously ensuring sufficient deformability of the rocking isolation story while effectively mitigating the seismic demand on the superstructure. To address this challenge, this study investigates controlled rocking isolation systems (CRIS) with flag-shaped (FS) hysteretic devices. An analytical model is developed for elastic single-degree-of-freedom (SDOF) oscillators (representing elastic low-to-medium rise frames) fixed on CRIS with FS hysteresis. A practical application using NiTi shape-memory alloy (SMA)-based rocking columns is proposed to realize the intended FS behavior. The analytical model is validated through comparisons with a newly developed finite element model in OpenSees. Dimensional analysis is employed to reduce the number of governing variables in the equations of motion, thereby facilitating the identification of fundamental similarities in seismic responses across different structural scales and loading conditions. Both case-to-case and statistical comparisons confirm the accuracy of the proposed model. Based on the validated model, parametric studies are performed to examine the effects of varying FS hysteretic parameters and seismic input characteristics on the structural seismic performance. The results further confirm that CRIS exhibit enhanced dynamic stability relative to FRIS. Furthermore, it is possible to achieve a balance between controlled rocking and minimized superstructure demand for CRIS with FS hysteresis.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 13","pages":"3422-3441"},"PeriodicalIF":5.0,"publicationDate":"2025-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101001","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":"Physic-Law Integrated Neural Network for Nonlinear Seismic Demand Prediction","authors":"Jian Zhong,&nbsp;Yiwei Shu,&nbsp;Hao Wang","doi":"10.1002/eqe.70032","DOIUrl":"https://doi.org/10.1002/eqe.70032","url":null,"abstract":"<div>\u0000 \u0000 <p>Due to the structural parameters diversity, material attributes nonlinearity, and ground motions uncertainty, predicting the elastic-plastic seismic response of columns is challenging and crucial, particularly in near-fault areas where significant damage can occur. Traditional machine learning (ML) models have demonstrated powerful capabilities for predicting structural seismic demand. However, their difficulty in accurately capturing latent system nonlinearity and the challenges associated with quantifying the impact of pulse effects on structural seismic demand complicate their application in practical engineering. This study proposes an efficient, high-precision, and highly interpretable physic-law-integrated neural network (PLNN) method. It introduces a novel physic-law model (PLM), which establishes the relationship between the normalized period (pulse to structural fundamental period ratio) and seismic demand. In addition, this research examines and quantifies the effects of column properties and pulse attributes on the characteristic coefficients of the PLM using an artificial neural network model (ANN). This method provides a PLNN model for estimating seismic demand based on the structural parameters, material attributes, and seismic characteristics by integrating the ANN model with the PLM. The ability and stability of the PLNN are evaluated by comparing its prediction performance with that of a traditional ML model. The results indicated that the proposed PLNN model maintains high prediction accuracy and significantly enhances computational efficiency. The PLNN model in this research requires 10 neurons to achieve optimal fitting goodness, one-third of the number required by the corresponding ANN model. In addition, the accuracy of the PLNN model is twice that of the ANN model in small sample settings, indicating the stability of the PLNN.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 13","pages":"3379-3397"},"PeriodicalIF":5.0,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102237","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":"A Novel Optimal Design Method for Tuned Mass Dampers With Viscoelastic Motion-Limiting Stoppers","authors":"Gaoqiang Qu,&nbsp;Luyu Li,&nbsp;Qigang Liang,&nbsp;Jinping Ou","doi":"10.1002/eqe.70030","DOIUrl":"https://doi.org/10.1002/eqe.70030","url":null,"abstract":"<div>\u0000 \u0000 <p>As one of the most widely implemented passive control systems in structural engineering, Tuned Mass Dampers (TMDs) require precise parameter tuning to maintain optimal performance. However, the incorporation of motion-limiting stoppers introduces nonlinear effects that alter the system's inherent frequency and damping characteristics, ultimately leading to detuning and compromised control effectiveness. To address this issue, a TMD with piecewise stiffness-damping (PSDTMD) is proposed to optimize the TMDs with limiting stoppers. Numerical simulation results indicate that the classical linear method fails to design the PSDTMD parameters. Considering the nonlinearity of the PSDTMD, the decoupled motion equation for the PSDTMD is first obtained, and then its frequency response equation is analytically derived using the averaging method. By determining the frequency that maximizes the displacement of the PSDTMD, the analytical optimal frequency ratio is derived from the frequency response equation, and the optimal damping is discussed through comparisons with the classical linear design. Furthermore, the effectiveness of the PSDTMD using the novel design method is investigated using a single-degree-of-freedom (SDOF) structure and a nine-story benchmark structure. The control performance of the PSDTMD designed by the novel method is compared to that designed by the classical linear method. Results show that the control performance of the PSDTMD designed by the novel method is greatly improved. Besides, results show that the PSDTMD can significantly reduce the tuned mass stroke compared to the conventional TMD. In conclusion, the novel design method can consider the adverse effects of the viscoelastic motion-limiting stoppers and improve the control performance of TMDs, which is meaningful for the engineering application of TMDs.</p></div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 13","pages":"3341-3355"},"PeriodicalIF":5.0,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102347","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":"Shaking Table Test and Numerical Analysis on Seismic Performance of Step-Back Reinforced Concrete Frame Structures","authors":"Yangyang Tang,&nbsp;Baolong Jiang,&nbsp;Yingmin Li,&nbsp;Shuyan Ji","doi":"10.1002/eqe.70033","DOIUrl":"https://doi.org/10.1002/eqe.70033","url":null,"abstract":"<div>\u0000 \u0000 <p>Step-back buildings, characterized by a stilted story with columns of varying lengths, are prevalent in mountainous regions. These different vertical components often result in uneven structural stiffness, both vertically and laterally, which affects the seismic performance of these structures. This study investigates the seismic performance of step-back reinforced concrete (RC) frame structures through experimental tests and numerical simulations. Shaking table tests were conducted on two 1/8-scale models: one representing a step-back RC frame and the other a conventional structure. The comparison focused on failure patterns, dynamic properties, and structural responses, including acceleration, deformation, torsional effects, and story shear. The results show that the superstructure of the step-back structure model suffers more severe damage with a partial column hinge failure mechanism. The damage to columns in the stilted story and the first story of the superstructure is uneven. In particular, the torsional response of the stilted story is particularly significant. The shear force in the stilted story increases significantly, indicating an apparent redistribution of internal forces. Moreover, a 3D numerical simulation model of the tested step-back structure was established and validated. The influence of lateral stiffness in the stilted story on the seismic response was investigated. The results show that the reduced lateral stiffness in the stilted story leads to a reduced internal force redistribution of columns in the stilted story, with seismic damage being shifted downwards and concentrated in the shortest column. The torsional effect tends to increase, which may be due to the reduced torsional stiffness of the stilted story. More research is needed on the effect of torsional stiffness or related indicators on the torsional effect of step-back structures.</p>\u0000 </div>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 13","pages":"3398-3421"},"PeriodicalIF":5.0,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102348","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 Fragility Assessment of a Multi-Span Masonry Arch Bridge Using a Discontinuum Modeling Approach","authors":"Alessia Furiosi,&nbsp;Nicolò Damiani,&nbsp;Maria Rota,&nbsp;Andrea Penna","doi":"10.1002/eqe.70029","DOIUrl":"https://doi.org/10.1002/eqe.70029","url":null,"abstract":"<p>This paper investigates the seismic performance of a multi-span masonry arch bridge using an advanced modeling approach based on the Distinct Element Method. Located in Italy and constructed of regular stone masonry, the bridge features three consecutive arch vaults with similar geometry. The three-dimensional structure of the bridge is modeled using the commercial software 3DEC, as an assembly of discrete blocks including all its different structural and nonstructural components, such as piers, abutments, arch vaults, backing, spandrel walls, and backfill material. Masonry is represented as an assembly of rigid blocks connected by zero-thickness interfaces, while the backfill is modeled as a continuum mesh based on plasticity theory. The bridge geometry and material properties are derived from available in-situ surveys. Sensitivity analyses on the level of detail of the model are conducted to balance numerical accuracy and computational effort. A Maxwell damping model is employed to further reduce the time window required by dynamic simulations. Multi-stripe nonlinear time-history analyses are carried out, applying 200 three-component ground-motion records. The results are presented and discussed in terms of observed damage patterns and relationships between a case-specific engineering demand parameter (EDP) and typical intensity measures. Thresholds for various performance levels (PLs), including usability preventing damage and global collapse, are defined based on a statistical correlation between the selected EDP and the damage observed in each time-history analysis. Fragility curves are then generated for each of the considered PLs. Finally, model uncertainties are explored by introducing geometric variations in bridge components, highlighting their impact on the seismic vulnerability of the structure.</p>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 13","pages":"3320-3340"},"PeriodicalIF":5.0,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eqe.70029","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102364","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":"Seismic Retrofit of Non-Seismically Designed 3D Beam-Column Joints With Post-Installed Steel Haunches","authors":"Margaritis Tonidis,&nbsp;Akanshu Sharma,&nbsp;Veit Birtel","doi":"10.1002/eqe.70031","DOIUrl":"https://doi.org/10.1002/eqe.70031","url":null,"abstract":"<p>The paper presents experimental results on two-dimensional and three-dimensional full-scale exterior reinforced concrete beam-column joints subassemblies retrofitted with the Fully Fastened Haunch Retrofit Solution. The specimens were non-seismically designed with no transverse reinforcement in the joint core, thus making them vulnerable to joint shear failure. Three different beam-column joint configurations were investigated. The first one was a two-dimensional subassembly serving as a reference. Two unloaded transverse beams were added in the second specimen, while the third one additionally incorporated a monolithically cast slab. The specimens were subjected to unidirectional, quasi-static cyclic loads. In this retrofit solution, steel diagonals are post-installed onto the column and beam to create a new force path around the joint and thereby relocate the plastic hinge away from the joint to the beam. The haunch elements were connected to the column and beam with bonded anchors. The results showcased an upgraded seismic performance of the beam-column joints in terms of stiffness, strength, and ductility compared to their as-built counterparts. The results were evaluated in terms of cyclic load-displacement behaviour, energy dissipation, crack development in concrete, strain development in reinforcing bars and in steel diagonals, as well as qualitative force distribution within the anchor group. The redistribution of forces within the anchor group, an increase in anchorage capacity when the slab was present, as well as the vulnerability of a shear failure in the column due to the slab's participation in flexure constituted the main findings of this study. It was concluded that the performance and efficacy of this retrofit solution strongly depend on the anchorage performance.</p>","PeriodicalId":11390,"journal":{"name":"Earthquake Engineering & Structural Dynamics","volume":"54 13","pages":"3356-3378"},"PeriodicalIF":5.0,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eqe.70031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102213","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}