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This paper presents a co-rotational beam formulation, which is used for geometric nonlinear analysis with the differential reproducing kernel (DRK) approximation collocation method. The present formulation, based on the Timoshenko beam hypothesis, is capable of effectively solving geometrically nonlinear problems such as large deformation, postbuckling, lateral buckling, and snap-through problems. The kinematics have been constructed with the concept of co-rotational formulation adopted in the finite element method (FEM). A meshfree method based on the differential reproducing kernel (DRK) approximation collocation method, combined with the Newton–Raphson method, is employed to solve the strong forms of the geometrically nonlinear problems. The DRK method takes full advantage of the meshfree method. Moreover, only a scattered set of nodal points is necessary for the discretization. No elements or mesh connectivity data are required. Therefore, DRK will be able to completely circumvent the problems of mesh dependence and mesh distortion. The effectiveness of this study and its performance are shown through several numerical applications.
Wen-Cheng Yeh. A Co-Rotational Meshfree Method for the Geometrically Nonlinear Analysis of Structures. Applied Sciences 2021, 11, 6647 .
AMA StyleWen-Cheng Yeh. A Co-Rotational Meshfree Method for the Geometrically Nonlinear Analysis of Structures. Applied Sciences. 2021; 11 (14):6647.
Chicago/Turabian StyleWen-Cheng Yeh. 2021. "A Co-Rotational Meshfree Method for the Geometrically Nonlinear Analysis of Structures." Applied Sciences 11, no. 14: 6647.
The main contributing factor of the urban heat island (UHI) effect is caused by daytime heating. Traditional pavements in cities aggravate the UHI effect due to their heat storage and volumetric heat capacity. In order to alleviate UHI, this study aims to understand the heating and dissipating process of different types of permeable road pavements. The Ke Da Road in Pingtung County of Taiwan has a permeable pavement materials experiment zone with two different section configurations which were named as section I and section II for semi-permeable pavement and fully permeable pavement, respectively. The temperature sensors were installed during construction at the depths of the surface course (0 cm and 5 cm), base course (30 cm and 55 cm) and subgrade (70 cm) to monitor the temperature variations in the permeable road pavements. Hourly temperature and weather station data in January and June 2017 were collected for analysis. Based on these collected data, heat storage and dissipation efficiencies with respect to depth have been modelled by using multi regression for the two studied pavement types. It is found that the fully permeable pavement has higher heat storage and heat dissipation efficiencies than semi-permeable pavement in winter and summer monitoring period. By observing the regressed model, it is found that the slope of the model lines are almost flat after the depth of 30 cm. Thus, from the view point of UHI, one can conclude that the reasonable design depth of permeable road pavement could be 30 cm.
Ching-Che Yang; Jun-Han Siao; Wen-Cheng Yeh; Yu-Min Wang. A Study on Heat Storage and Dissipation Efficiency at Permeable Road Pavements. Materials 2021, 14, 3431 .
AMA StyleChing-Che Yang, Jun-Han Siao, Wen-Cheng Yeh, Yu-Min Wang. A Study on Heat Storage and Dissipation Efficiency at Permeable Road Pavements. Materials. 2021; 14 (12):3431.
Chicago/Turabian StyleChing-Che Yang; Jun-Han Siao; Wen-Cheng Yeh; Yu-Min Wang. 2021. "A Study on Heat Storage and Dissipation Efficiency at Permeable Road Pavements." Materials 14, no. 12: 3431.
The peak dynamic responses of a typical isolated bridge under basic pulse motions and a set of near-field (NF) earthquake records were investigated in this study. A numerical model of the isolated bridge was constructed and validated using seismic response measurements. Nonlinear time-history analyses were conducted for the isolated bridge by considering various post-yield stiffness ratios of the isolators and dominant pulse periods of the ground motions. The analysis results revealed that the peak pulse response and mean-plus-one standard deviation of the peak NF seismic response had similar trends of variation with the stiffness ratio. The ratio of the mean-plus-one standard deviation of the peak NF seismic response to the peak pulse response was described using a simple empirical formula. Using this formula, the NF seismic response of the isolated bridge could be estimated from the one-cycle Type-A pulse motion. The aforementioned ratio was approximated to 0.75 if the pulse period was larger than 6 s. However, the aforementioned ratio varied from 0.1 to 0.5 when the post-yield stiffness ratio varied from 0.1 to 0.45 if the pulse period was 1 s.
Meng-Hao Tsai; Zheng-Yan Jiang; Wen-Cheng Yeh. Estimating the Peak Longitudinal Near-Field Seismic Response of an Isolated Bridge Using Basic Pulse Motions. International Journal of Civil Engineering 2021, 19, 789 -803.
AMA StyleMeng-Hao Tsai, Zheng-Yan Jiang, Wen-Cheng Yeh. Estimating the Peak Longitudinal Near-Field Seismic Response of an Isolated Bridge Using Basic Pulse Motions. International Journal of Civil Engineering. 2021; 19 (7):789-803.
Chicago/Turabian StyleMeng-Hao Tsai; Zheng-Yan Jiang; Wen-Cheng Yeh. 2021. "Estimating the Peak Longitudinal Near-Field Seismic Response of an Isolated Bridge Using Basic Pulse Motions." International Journal of Civil Engineering 19, no. 7: 789-803.