Subjects: Mechanics >> Other Disciplines of Mechanics submitted time 2024-04-19 Cooperative journals: 《应用力学学报》
Abstract：
A new form of assembled beam-column joint is proposed,and in order to study the mechanical properties of this joint,the parametric analysis of the assembled new beam-column joint with cantilever beam segment splicing is carried out by ABAQUS software on the basis of the preliminary experimental research.First,the test model of the assembled beam-column joint was established by ABAQUS,and the test results were compared and verified. Then,the parametric analysis of the spliced joint with cantilevered beam segments was carried out and the mechanical properties of the joint under different parameters were obtained by considering the number of stiffening ribs,thickness of cross-plate,thickness of plates,and length of L-shaped angle steel.
Subjects: Mechanics >> Solid Mechanics submitted time 2024-02-07 Cooperative journals: 《应用力学学报》
Abstract：
Based on the cyclic load testing of steel reinforced recycled concrete filled circular steel tube columns,the hysteretic performance of composite columns was numerically analyzed by using OpenSees software,and the hysteretic curves and performance indexes of composite columns were obtained. Compared with the experimental results,the rationality of the numerical model of the composite column was verified. On this basis,the influence levels of parameters on the hysteretic performance of composite columns were analyzed. The results showed that the replacement rate of recycled aggregate increased from 0 to 100%,the peak load of composite columns decreased by 7.78%,and the ductility decreased slightly. Improving the strength of recycled concrete,section steel and circular steel tube was beneficial to improving the bearing capacity and stiffness of composite columns,but it also increased the brittleness of composite columns. With the growth of axial compression ratio,the bearing capacity of composite columns increased first and then decreased,and the ductility decreased gradually. The steel ratio of section steel rose from 5.54% to 9.99%,and the peak load of composite columns increased by 24.34%,but it did not obviously improve the ductility of composite columns. Increasing the wall thickness of steel tube was beneficial to the bearing capacity and ductility of composite columns.
Subjects: Dynamic and Electric Engineering >> Other Disciplines of Dynamic and Electric Engineering submitted time 2024-02-07 Cooperative journals: 《应用力学学报》
Abstract： The on-orbit deployment of the spatial structure involves the complex high-dimensional nonlinear dynamic problems,the analysis on which is one of the challenges in the astrodynamics field and the precondition of performing the control strategy on the on-orbit deployment process.In this paper,taking the 1st deploying stage of the IKAROS solar sail as an example,the flexible stretching hub-beam model is proposed and the dynamic equation for which is presented based on the Hamiltonian variational principle.Employing the complex structure-preserving method which focuses on the local dynamic behaviors of the system,the 1st deploying process of the IKAROS solar sail is simulated under two working conditions(invariable torque and constant power)respectively.The numerical results show that the differences between the rotational velocities of the hub for the two cases are remarkable.The rotational stability of the hub turns bad with the invariable torque,which results in the large work needed in the 1st deploying stage of the IKAROS solar sail and implies that the constant power working condition can save energy in this process.
Subjects: Mechanics >> Solid Mechanics submitted time 2023-06-21 Cooperative journals: 《应用力学学报》
Abstract：
The ancient pagodas are mostly high-rise structures.Under long-term high-pressure stress,there are internal damage defects,which reduces the reliability of the structure.Therefore,it is necessary to evaluate the compression performance of the ancient pagoda structure and study the reinforcement method.This paper takes the bottom structure of Xuanzang Pagoda in Xingjiao Temple in Xi'an,Shaanxi Province as the prototype,and builds 2 sub-structure models at a scale of 1/8.The substructure model after compression failure is restrained by angle steel hoop.Through the compression test and numerical calculation of the ancient pagoda substructure model,the pressure performance and failure mechanism of the ancient pagoda after reinforcement are analyzed,the influence of the hoop restraint on the pressure performance of the ancient pagoda is studied,and the parameter expansion analysis is carried out.The results show that the tensile failure form at the edge of the pagoda body changes after the angle steel is used,the tensile failure range is reduced,the integrity of the structure is enhanced,the compressive bearing capacity and deformation capacity are improved. The numerical calculation results can better simulate the pagoda model mechanical performance and failure characteristics,the model's ultimate bearing capacity calculation value and the test value error are within 14%; increasing the thickness and width of the angle steel can improve the bearing capacity of the pagoda,and it can increase the thickness of the angle steel when strengthening the ancient pagoda with minor damage.When strengthening the seriously damaged ancient pagoda,the cross-sectional width of the angle steel can be increased to enhance the crack resistance and ultimate bearing capacity of the pagoda.our study Provides a theoretical basis for the safety assessment and reinforcement of ancient pagoda structures.
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