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Pseudo-Static Test Research on Behavior of UHPC-Filled Rectangular Steel Tubular Columns
Yanxiang Yan,Heng Cai,Tao Cheng 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.7
This paper examines the cyclic behaviour of 13 ultra-high performance concrete filled steel tube columns (UHPCFSTs) by using pseudo-static test. The parameters such as the axial compression ratio, the steel tube thickness, the aspect ratio (h/b) and the loading modes (loaded with 10 cycles, 3 cycles and monotonic loading) are taken into account, and the effects of the parameters are discussed. The results have shown that there are three types of failure modes for UHPCFSTs named the flexural failure mode, the compression-flexure failure mode and the welding seam fracture. The damage to the bottom of the columns is more serious compared to other positions. UHPCFSTs exhibit favorable seismic performance, which reflects that the equivalent viscous damping coefficients for UHPCFSTs failure are no less than 0.3, and the drift ratios of elasticity and elastoplasticity are within the scopes of 1.21% − 2.18% and 2.36% − 4.58%, respectively. The cumulative damage is not serious for specimens loaded with 10 cycles and 3 cycles under the drift ratio of 2%, whilst under the drift ratio of 4%, the specimens loaded with 10 cycles experience more serious damage compared with that loaded with 3 cycles.
Nonlinear Analysis on the Static and Cyclic Behaviors of UHPC Filled Rectangular Steel Tube Columns
Heng Cai,Fangqian Deng,Yanxiang Yan 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.3
In this paper, a fiber-based computational model is developed for the nonlinear analysis on the static and cyclic behaviors of ultra-high performance concrete filled rectangular steel tube (UHPCFST) columns. In the computational framework, a simplified compressive constitutive model of UHPC confined by rectangular steel tubes is firstly proposed based on available experimental data. Then, two approaches are adopted for considering the local buckling of steel tubes. The second-order as well as the material nonlinearity are also taken into account. Finally, comparative analyses between the predicted and experimental results of the UHPCFST columns are undertaken to verify the robustness and reliability of the fiber-based model. It is shown that the developed fiber-based modeling technique can predict the structural performance of UHPCFST columns with good satisfaction.
Aspect-Based Sentiment Analysis with Position Embedding Interactive Attention Network
Yan Xiang,Jiqun Zhang,Zhoubin Zhang,Zhengtao Yu,Yantuan Xian 한국정보처리학회 2022 Journal of information processing systems Vol.18 No.5
Aspect-based sentiment analysis is to discover the sentiment polarity towards an aspect from user-generatednatural language. So far, most of the methods only use the implicit position information of the aspect in thecontext, instead of directly utilizing the position relationship between the aspect and the sentiment terms. Infact, neighboring words of the aspect terms should be given more attention than other words in the context. This paper studies the influence of different position embedding methods on the sentimental polarities of givenaspects, and proposes a position embedding interactive attention network based on a long short-term memorynetwork. Firstly, it uses the position information of the context simultaneously in the input layer and theattention layer. Secondly, it mines the importance of different context words for the aspect with the interactiveattention mechanism. Finally, it generates a valid representation of the aspect and the context for sentimentclassification. The model which has been posed was evaluated on the datasets of the Semantic Evaluation 2014. Compared with other baseline models, the accuracy of our model increases by about 2% on the restaurantdataset and 1% on the laptop dataset.