Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： In view of the influence of different constraints on vibration characteristics of transportation pipe-line , the research mainly focuses on the effects of hinge and elastic constraints on the natural frequenciesand modes of the pipeline by the bidirectional fluid structure interaction. With the results of modal analysisand the stress and deformation on the pipe outer wall , the harmonic response of elastic-constrained pipe isanalyzed , and the structure is optimized according to the analysis results. The results show that the elasticconstraint pipe has the largest natural frequency , the smallest amplitude , and the simplest vibration mode;therefore , it is the most suitable choice for the top of the pipe in the actual project. When the excitation fre-quency is close to the seventh-order natural frequency , the vibration response of pipeline is the most in-tense.The method of welding strong ring is used to optimize the pipeline , and the results of modal analysisbefore and after the optimization are compared , which proves the feasibility of the optimization.
Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： A new type of bamboo-plywood and thin-walled steel tube-encased dust-powder concrete com-posite column (BSDCC) was proposed.Ten BSDCC specimens were used to perform the axial compressiontest.'The damage and failure mode were investigated , and the influences of dust-powder concrete ( DPC)content ratio, concrete strength , slenderness ratio , restraint mode of sectional combination and binding-bars , and spacing ratio of binding-bars on the ultimate bearing capacity and deformation of specimens wereanalyzed.The results show that the compressive failure modes of BSDCC are mainly glue failure of the bamboo plywood and the thin-walled steel tube between the binding bars , and the material broken damageof the bamboo plywood in the middle of the specimen.The concrete content ratio has no significant effecton the ultimate bearing capacity , but has an important effect on the deformation under the same condition,which leads to the change of the failure mode of the specimen. The bearing capacity of specimens decrea-ses with the increase of the slendeness ratio and the spacing ratio of the binding bars , and increases withthe increasing concrete strength and the constraint of sectional combination and binding bars restraint modeon the bamboo plywood.A calculating model for the axial compression bearing-capacity of BSDCC is pro-posed through the regression analysis.
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