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A Study of the Dynamic Characteristics of Red Sandstone Residual Soils Based on SHPB Tests
Tong Wang,Zhanping Song,Jianyong Yang,Qiang Zhang,Yun Cheng 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.5
To explore the response characteristics of soil under dynamic loads, cyclic impact tests with varying axial compressions and impact velocities were conducted using SHPB tests. The test results were analyzed to study the mechanical properties and energy dissipation characteristics due to impact loads. In terms of mechanical properties, for the same impact times, the peak stress of the specimen with axial compression was found to be greater than that without axial compression, but the final strain was lower than that without axial compression, indicating that axial compression affects the peak stress and final strain of the specimen. The dynamic stress strengthening of the specimen under cyclic impact loads has also been analyzed. In terms of energy dissipation, the effects of axial compression, impact velocity, and impact times on the ratios of dissipated energy, reflected energy, and transmitted energy to incident energy were compared, and it was found that the ratio of the dissipated energy did not exceed 24% under any condition. In terms of damage evolution, the damage variable gradually decreases with an increase in impact times. A critical value of the damage variable was determined, above which the transmittance continued to decrease, the reflectivity gradually increased, and the dissipation rate remained stable.
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Geng, Fangfang,Ding, Youliang,Xie, Hongen,Song, Jianyong,Li, Wanheng Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.1
A three-dimensional finite element model for the Jiashao Bridge, the longest multi-span cable-stayed bridge in the world, is established using the commercial software package ANSYS. Dynamic characteristics of the bridge are analyzed and the effects of structural system measures including the rigid hinge, auxiliary piers and longitudinal constraints between the girders and side towers on the dynamic properties including modal frequency, mode shape and effective mass are studied by referring to the Jiashao Bridge. The analysis results reveal that: (i) the installation of the rigid hinge significantly reduces the modal frequency of the first symmetric lateral bending mode of bridge deck. Moreover, the rigid hinge significantly changes the mode shape and effective mass of the first symmetric torsional mode of bridge deck; (ii) the layout of the auxiliary piers in the side-spans has a limited effect on changing the modal frequencies, mode shapes and effective masses of global vibration modes; (iii) the employment of the longitudinal constraints significantly increases the modal frequencies of the vertical bending modes and lateral bending modes of bridge deck and have significant effects on changing the mode shapes of vertical bending modes and lateral bending modes of bridge deck. Moreover, the effective mass of the first anti-symmetric vertical bending of bridge deck in the longitudinal direction of the fully floating system is significantly larger than that of the partially constrained system and fully constrained system. The results obtained indicate that the structural system measures of the multi-span cable-stayed bridge have a great effect on the dynamic properties, which deserves special attention for seismic design and wind-resistant design of the multi-span cable-stayed bridge.
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Fangfang Geng,Youliang Ding,Hongen Xie,Jianyong Song,Wanheng Li 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.1
A three-dimensional finite element model for the Jiashao Bridge, the longest multi-span cablestayed bridge in the world, is established using the commercial software package ANSYS. Dynamic characteristics of the bridge are analyzed and the effects of structural system measures including the rigid hinge, auxiliary piers and longitudinal constraints between the girders and side towers on the dynamic properties including modal frequency, mode shape and effective mass are studied by referring to the Jiashao Bridge. The analysis results reveal that: (i) the installation of the rigid hinge significantly reduces the modal frequency of the first symmetric lateral bending mode of bridge deck. Moreover, the rigid hinge significantly changes the mode shape and effective mass of the first symmetric torsional mode of bridge deck; (ii) the layout of the auxiliary piers in the side-spans has a limited effect on changing the modal frequencies, mode shapes and effective masses of global vibration modes; (iii) the employment of the longitudinal constraints significantly increases the modal frequencies of the vertical bending modes and lateral bending modes of bridge deck and have significant effects on changing the mode shapes of vertical bending modes and lateral bending modes of bridge deck. Moreover, the effective mass of the first anti-symmetric vertical bending of bridge deck in the longitudinal direction of the fully floating system is significantly larger than that of the partially constrained system and fully constrained system. The results obtained indicate that the structural system measures of the multi-span cable-stayed bridge have a great effect on the dynamic properties, which deserves special attention for seismic design and wind-resistant design of the multi-span cable-stayed bridge.
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