Structures最新文献_第7页

Experimental study of clay concrete filled steel tubular stub columns under axial compression 轴向压缩条件下粘土混凝土填充钢管桩柱的实验研究

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-25 DOI: 10.1016/j.istruc.2024.107509

Qing-Xin Ren , Kan Zhou , Wei Li

引用次数: 0

Performance of SRC unequal-depth beam-column irregular joint in NPP under progressive collapse 国家核电厂中渐进式坍塌下的 SRC 不等深梁柱不规则连接性能

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-25 DOI: 10.1016/j.istruc.2024.107593

Qiang Pei , Yingzhu Zhong , Bo Wang , Pengfei Qi , Zhicheng Xue , Di Cui , Yu Ding , Bangwen Cai

{"title":"Performance of SRC unequal-depth beam-column irregular joint in NPP under progressive collapse","authors":"Qiang Pei , Yingzhu Zhong , Bo Wang , Pengfei Qi , Zhicheng Xue , Di Cui , Yu Ding , Bangwen Cai","doi":"10.1016/j.istruc.2024.107593","DOIUrl":"10.1016/j.istruc.2024.107593","url":null,"abstract":"<div><div>The prototype structure of this study is taken from the main shield building of nuclear power plant (NPP) conventional island facilities. Emphasis is on steel reinforced concrete (SRC) unequal-depth beam-column irregular joints, studying their resistance to progressive collapse via analysis of two 1/5 scale irregular joints. Vertical monotonic loading tests were conducted on the joints, followed by numerical simulations to analyze their mechanical properties, failure modes, and progressive collapse resistance. Experimental analyses focused on irregular joint failure modes, central column load changes with displacement, beam deformations, strain variations in critical sections, and resistance mechanism development. Finite element (FE) software modeled these behaviors and was validated against experimental data. Then, according to the various beam section depths of the connected beams, this research applied the validated numerical models to examine the load-bearing capacity of the irregular joints. The results indicate that the damage of the unequal-depth beam-column irregular joint exhibits significant asymmetric characteristics. In terms of load performance, the performance of the irregular joint depends on the component performance of the shallow beam section. Within a certain range, the greater the height difference between the various beams, the greater the joint bearing capacity, but the stability of the bearing performance deteriorates. The fracture yield of H-shaped steel significantly reduces the bearing capacity, and it is recommended to reinforce shallow beams. Providing data reference for the design of the irregular joints has important practical significance.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"70 ","pages":"Article 107593"},"PeriodicalIF":3.9,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538977","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

Mechanical properties and restoring force model of Squeezing Rub-type Particle Damper 挤压摩擦型颗粒阻尼器的机械特性和恢复力模型

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-25 DOI: 10.1016/j.istruc.2024.107421

Dan Ye , Jianting Zhou , Lueqin Xu , Ruijie Zhang , Shuangshuang Jin , Yangqing Liu , Jun Yang

{"title":"Mechanical properties and restoring force model of Squeezing Rub-type Particle Damper","authors":"Dan Ye , Jianting Zhou , Lueqin Xu , Ruijie Zhang , Shuangshuang Jin , Yangqing Liu , Jun Yang","doi":"10.1016/j.istruc.2024.107421","DOIUrl":"10.1016/j.istruc.2024.107421","url":null,"abstract":"<div><div>The sliding effect of isolation bearings has been proven to effectively mitigate the seismic effects on large-span bridges. However, it also results in excessive relative displacement between the main girder and piers during earthquakes. In this study, a pioneering Squeezing Rub-type Particle Damper (SRPD) is developed to address this issue. In order to verify the damping characteristics of SRPDs and investigate the working principle of squeezing friction energy dissipation, five quasi-static tests were conducted on SRPDs using two particle damping materials with different compactness levels. In order to compare the energy dissipation performance, comparative tests were conducted on Non-Squeezing-type Particle Dampers (NSPDs) and SRPDs. Utilizing regression analysis, two skeletal curve models for SRPDs were proposed, alongside a detailed restoring force model that incorporates considerations for both the pinching effect and stiffness degradation phenomena observed during the loading and unloading phases. The experimental results demonstrate that the maximum damping force of SRPDs can reach 16 times that of NSPDs, and the energy dissipation of each loading cycle can reach 21.06 times that of NSPDs. SRPDs exhibits improved energy dissipation performance when using high-density blended quartz sand. After sand replenishment repairs,damping force and energy dissipation per cycle of SRPDs were significantly enhanced. The proposed restoring force models of SRPDs aligns well with the experimental curves, underscoring its efficacy in accurately characterizing the hysteresis performance of SRPDs.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"70 ","pages":"Article 107421"},"PeriodicalIF":3.9,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538938","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

Research on the relationship between comprehensive characteristics of cracks and stiffness of RC beams 裂缝综合特征与钢筋混凝土梁刚度关系的研究

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-25 DOI: 10.1016/j.istruc.2024.107612

Fengyu Chen , Zhaohui Chen , Jin Di , Peng Qiao , Haotian Geng , Minmao Liao

{"title":"Research on the relationship between comprehensive characteristics of cracks and stiffness of RC beams","authors":"Fengyu Chen , Zhaohui Chen , Jin Di , Peng Qiao , Haotian Geng , Minmao Liao","doi":"10.1016/j.istruc.2024.107612","DOIUrl":"10.1016/j.istruc.2024.107612","url":null,"abstract":"<div><div>The relationship between crack comprehensive characteristics and the stiffness of RC beams is investigated through experimental tests and numerical simulations. A synthetic parameter, the surface damage ratio (SDR), is proposed to represent the comprehensive characteristics of cracks, including crack width, length and location. Crack propagation in RC beams is simulated using a dual-damage parameter plastic damage model. A method for calculating the width and length of cracks is developed based on integral point strains and element equivalent length. The accuracy of this method is verified by comparing it with the results of four-point bending tests on RC T-beams and rectangular beams. Correlation analysis indicates that the cracks in different zones have varying impacts on beam stiffness, with crack length in the bending area and crack width in the shear area having a greater impact than others. To consider the comprehensive characteristics of cracks and their impact on beam stiffness, the SDR, the ratio between the entire crack area and the intact area of the beam surface, is proposed. The proposed parameter is shown to increase linearly with load, resulting in beam stiffness degradation following a power law. The accuracy and applicability of the proposed SDR and its correlation with load and stiffness are verified through load tests on rectangular beams with different reinforcement ratios using Cervenka’s test. Parameter analysis has shown that the section modulus, concrete strength, reinforcement arrangement, and ratios significantly influence how beam stiffness varies with SDR. The presented simulation model for concrete crack evolution, combined with the synthetic parameter of crack characteristics, and the correlation analysis, provide a valuable approach for the safety evaluation of concrete beams during their service life.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"70 ","pages":"Article 107612"},"PeriodicalIF":3.9,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538941","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

Stacking BSRG-PLS: A physical and data-driven real-time stability safety analysis of arch dams during operation 叠加 BSRG-PLS：运行期间拱坝的物理和数据驱动实时稳定性安全分析

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-25 DOI: 10.1016/j.istruc.2024.107615

Haifeng Jiang , Dongjian Zheng , Xin Wu , Xingqiao Chen , Xinhang Liu

{"title":"Stacking BSRG-PLS: A physical and data-driven real-time stability safety analysis of arch dams during operation","authors":"Haifeng Jiang , Dongjian Zheng , Xin Wu , Xingqiao Chen , Xinhang Liu","doi":"10.1016/j.istruc.2024.107615","DOIUrl":"10.1016/j.istruc.2024.107615","url":null,"abstract":"<div><div>Anti-sliding stability is the foundation for the normal operation of arch dams. In recent years, extreme weather has occurred frequently. It is important to grasp the anti-slide stability of arch dam (ASSAD) under complex load conditions in time. Currently, the ASSAD safety factor is primarily analyzed through the finite element method (FEM), which are time-consuming, labor-intensive, and lack timeliness. To address this, this paper proposes a real-time ASSAD analysis method during operation based on the Stacking BSRG-PLS model, which integrates a Bidirectional long short-term memory network, Residual neural network, Support vector machine, Gaussian process regression model and Partial Least Squares regression method. Firstly, based on the Stacking BSRG-PLS model and measured temperature combing with FEM, the transient temperature field of arch dam is established. Subsequently, a sample dataset containing the load data and the corresponding ASSAD safety factors calculated by FEM is constructed. Whereafter, using the Stacking BSRG-PLS model again, the real-time ASSAD safety factor is obtained based on the sample dataset. Case studies indicate that this method is effective and feasible, and has high analysis precision. It provides an effective way to quickly evaluate the ASSAD safety based on the measured data.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"70 ","pages":"Article 107615"},"PeriodicalIF":3.9,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538939","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

Ductility and cracking behavior of UHPC-RC composite beam under bending test based on acoustic emission parameters 基于声发射参数的 UHPC-RC 复合梁弯曲试验下的延展性和开裂行为

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-25 DOI: 10.1016/j.istruc.2024.107624

Shengli Li , Wei Gou , Zikang Tan , Milad Hedayat , Wencong Sun , Pan Guo

{"title":"Ductility and cracking behavior of UHPC-RC composite beam under bending test based on acoustic emission parameters","authors":"Shengli Li , Wei Gou , Zikang Tan , Milad Hedayat , Wencong Sun , Pan Guo","doi":"10.1016/j.istruc.2024.107624","DOIUrl":"10.1016/j.istruc.2024.107624","url":null,"abstract":"<div><div>Ultrahigh-performance concrete (UHPC) possesses improved mechanical properties due to its high strength, durability, and toughness. Currently, there is a single method for detecting the cracking behavior and evaluating the ductility of the UHPC-reinforced concrete (RC) composite beam. As an important part of structural non-destructive monitoring techniques, the acoustic emission (AE) technique can be used to analyze the damage pattern of the structure by the variation characteristics of its individual parameters. On this basis, four-point bending tests were carried out on the RC beam and UHPC-RC composite beam, and the AE technique was used for ductility analysis and cracking behavior monitoring. The results showed that the UHPC material enhanced the flexural capacity of the UHPC-RC composite beam. The AE ring counts and energy parameters could be used to analyze the cracking process of the UHPC-RC composite beam during flexural damage. The proposed new ductility indices, AE ring counts ductility index (ARD) and AE energy ductility index (AED), differed from the displacement ductility indices within the range of 2 %, providing a new method for calculating ductility indices of concrete structures. During the failure stage, the UHPC-RC composite beam produced more tensile cracks at the early stage of cracking and the stage of damage compared to the RC beam. In addition, the b value of the RC beam had a large range of fluctuations during the failure stage, indicating that the RC beam produced more micro-cracks and macro-cracks and more damage compared to the UHPC-RC composite beam.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"70 ","pages":"Article 107624"},"PeriodicalIF":3.9,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538980","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

Evaluation of the seismic performance of a multi-coil MR damper using non-linear method 使用非线性方法评估多线圈 MR 阻尼器的抗震性能

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-25 DOI: 10.1016/j.istruc.2024.107555

C. Daniel , S. Vivekananda Sharma , G. Hemalatha , E. Arunraj

{"title":"Evaluation of the seismic performance of a multi-coil MR damper using non-linear method","authors":"C. Daniel , S. Vivekananda Sharma , G. Hemalatha , E. Arunraj","doi":"10.1016/j.istruc.2024.107555","DOIUrl":"10.1016/j.istruc.2024.107555","url":null,"abstract":"<div><div>Magnetorheological dampers (MR) have the ability to provide high damping and subsequent energy dissipation which has a potential application in mitigation of natural hazard. These features of advanced damping technology achieved from the interaction between magnetic field induced MR fluid and the rod of piston. In this paper, hybrid simulation is evaluated for a Reinforced Concrete (RC) frame with MR Damper under various configuration subjected to dynamic loading is numerically investigated using OpenSees framework and validated experimentally. In OpenSees framework Bouc Wen Material parameters were incorporated by the experimental results of MR Damper. The response of the three RC frames, both numerically and the experimentally having diagonally attached MR damper at 0 A current, 3 A current and without MR damper, were compared for El-Centro excitation. In comparison of results, the specimen with MR Damper at 3 A current displays better performance. Maximum of 23.02 % displacement reduction with 38.35 % frame force increment can be achieved when compared with bare frame. This validation proves the hybrid simulation system has successfully predicted the seismic response of the test specimen.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"70 ","pages":"Article 107555"},"PeriodicalIF":3.9,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538937","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

Dynamic performance investigations of a full-scale unanchored thin-walled steel fluid storage tank via shake table tests 通过振动台试验研究全尺寸非锚固薄壁钢制流体储罐的动态性能

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-24 DOI: 10.1016/j.istruc.2024.107548

Seyed Ehsan Aghakouchaki Hosseini, Sherif Beskhyroun

{"title":"Dynamic performance investigations of a full-scale unanchored thin-walled steel fluid storage tank via shake table tests","authors":"Seyed Ehsan Aghakouchaki Hosseini, Sherif Beskhyroun","doi":"10.1016/j.istruc.2024.107548","DOIUrl":"10.1016/j.istruc.2024.107548","url":null,"abstract":"<div><div>Theoretical models proposed in the literature and seismic design codes make the basis of analysis and the design procedures of fluid storage tanks. These models are derived based on many simplified and approximate assumptions. Under realistic conditions, however, different factors cause violation of these assumptions, causing the fluid flow and fluid–structure interaction (FSI) to diverge from theories. In this research work, 38 swept-sine tests and 63 seismic ground motions were applied to a full-scale highly flexible unanchored thin-walled stainless steel fluid tank. The experimental natural frequencies of the system for three different aspect ratios of 2.1, 2.8, and 3.5 were calculated and compared with the theoretical ones. Damping ratios for different modes were calculated using the half-power bandwidth analysis. Experimental results revealed discrepancies between the theoretical and experimentally detected natural frequencies, especially for the convective mode. Closer matches were found for the aspect ratios of 2.8 and 3.5, for the impulsive mode. Acceleration amplification factors at different heights of the shell were calculated which showed a nonlinear behaviour with a descending trend from the base to the mid-height and then an ascending one towards the fluid surface. Maximum acceleration amplification factor occurred at the surface of the fluid. The axial strains around the base are maximum and decrease bi-linearly towards the upper heights of the shell. Effects of the input excitation frequency content over the structural responses of the system were examined. Frequency characteristics of the input excitation considerably affected the maximum acceleration amplification factors and axial strains in the shell.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"70 ","pages":"Article 107548"},"PeriodicalIF":3.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539017","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}

引用次数: 0

Impact behavior of the SCS panel with hybrid energy absorbing components: Experimental and analytical studies 带有混合吸能部件的 SCS 面板的冲击行为：实验和分析研究

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-24 DOI: 10.1016/j.istruc.2024.107620

Jingyi Lu , Yonghui Wang , Hongyuan Zhou , Jialu Ma

{"title":"Impact behavior of the SCS panel with hybrid energy absorbing components: Experimental and analytical studies","authors":"Jingyi Lu , Yonghui Wang , Hongyuan Zhou , Jialu Ma","doi":"10.1016/j.istruc.2024.107620","DOIUrl":"10.1016/j.istruc.2024.107620","url":null,"abstract":"<div><div>A new steel-concrete-steel panel with front aluminum foam layer and rear energy absorbing connector (SCS-FL-EAC) was firstly developed. The dynamic behavior of SCS-FL-EAC was studied through conducting drop-weight impact tests. Three stages of impact process of SCS-FL-EAC were identified. The aluminum foam layer and energy absorbing connector were crushed under impact loading. The aluminum foam layer reached densification, and a local indention was observed beneath the projectile. Plastic hinges were also found at the corners of the pleated steel plate of the energy absorbing connector. The SCS panel exhibited the combination of bi-linear global flexural deformation and local deformation. Furthermore, the effects of aluminum foam layer on the impact resistant performances of SCS-FL-EAC were investigated. The results indicated that the inclusion of the aluminum foam layer effectively mitigated inertial effects and reduced the maximum impact force. Additionally, the SCS-FL-EAC demonstrated improved impact-resistant performances with an increased thickness of the aluminum foam layer. Furthermore, an analytical model was proposed to predict the force and displacement responses of SCS-FL-EAC subjected to impact load, and the predicted impact responses showed good agreement with experimental results.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"70 ","pages":"Article 107620"},"PeriodicalIF":3.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538733","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

Flexural behavior of bonded post-tensioned concrete beams with steel or GFRP bars 带有钢筋或 GFRP 钢筋的粘结后张法混凝土梁的挠曲行为

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-24 DOI: 10.1016/j.istruc.2024.107549

Mohamed Salah , Ahmed Farag , Hatem Mostafa , Ahmed Elansary

{"title":"Flexural behavior of bonded post-tensioned concrete beams with steel or GFRP bars","authors":"Mohamed Salah , Ahmed Farag , Hatem Mostafa , Ahmed Elansary","doi":"10.1016/j.istruc.2024.107549","DOIUrl":"10.1016/j.istruc.2024.107549","url":null,"abstract":"<div><div>Post-tensioned concrete beams with GFRP reinforcement have gained attention in recent years due to their unique flexural behavior and potential cost benefits. Because of the absence of comprehensive guidelines in international codes and limited application in constructions, this hybrid system is adopted in the current paper as a pioneering solution for sustainable and eco-friendly construction practices. Particularly noteworthy is the corrosion resistance of GFRP bars, which significantly enhances the durability of structures. The influence of using GFRP with bonded post-tension concrete beam is experimentally investigated compared to concrete beams with prestressing and non-prestressing reinforcement. Eight concrete beams with different reinforcement types and ratios were cast and tested under three-point load. Flexural resistance, crack pattern, deflections, and strains of the beams were compared with a reference beam with prestressing and non-prestressing reinforcement. Experimental load capacities of the tested beams were compared to those obtained from various international codes. The experimental results revealed that the beams with GFRP bars had smaller failure load and larger deflection compared to those with non-prestressing steel by up to 25 % and 37 %, respectively. A 3D finite element model (FEM) was developed and validated by comparing the numerical results with those obtained from the experiments. A sensitivity analysis was performed, using the validated FEM, by changing the concrete strength, steel yield stress, and GFRP ultimate strength by ± 20 %. The sensitivity analysis included seventy-two beams which had the same dimensions, loading, and boundary conditions of the tested beams. Changing the concrete strength only led to varying the beam capacities by −7 % ∼ + 4 %. Changing the steel yield stress only led to changing of the beam capacities by −13 % ∼ + 11 %. No change was observed when the GFRP ultimate stress was varied by 20 %.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"70 ","pages":"Article 107549"},"PeriodicalIF":3.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538821","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