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Catenary Equation-Based Approach for Force Finding of Cable Domes
Zhengrong Jiang,Xiaowei Liu,Kairong Shi,Quanpan Lin,Zijian Zhang 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.1
Cable forces along the cable length direction vary with deadweight. An invariant that is horizontal component force along the cable length, is introduced to characterize prestress distribution of cable domes. A new approach named catenary equationbased component force balancing method, is proposed for force fi nding. In the method, the relationship between the form and the horizontal component force of the cable is determined according to catenary equation of the cable. Based on the horizontal component force of one cable, the horizontal component forces of other cables can be solved from the nodal equilibrium relationship. Take the Geiger cable dome as an example, the results of force fi nding show that the proposed method has clear mechanical concept, high calculation accuracy and simple solving process. Thus, it can provide a new general idea for force fi nding of cable domes. In addition, the diff erence of the results of force fi nding is large between with deadweight considered and with deadweight ignored. Therefore, deadweight should be considered during the prestress design of cable domes.
Bounded Traveling Wave Solution of a Nonlinear Equation
Jiang Tao,Yang Zhiyan,Liu Zhengrong 경북대학교 자연과학대학 수학과 2003 Kyungpook mathematical journal Vol.43 No.1
Bifurcation method of dynamical systems is applied to investigate traveling waves of nonlinear equation[a(1 + bu)u ]ux + uxxx = 0with =a,= > 0. Parameter space is partitioned. Types of bounded traveling waves are shown, that is, the equation has three types of bounded traveling waves, solitary waves,periodic waves and domain wall waves. When integral constant is zero, explicit expressions of bounded traveling wave solutions are obtained.
Sheng He,Zhengrong Jiang,Jian Cai 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
Based on the theory of probability and mathematical statistics and on the results of nearly 2000 cases of elasto-plastic stabilityanalysis for single-layer reticulated shells, a new simulation method of initial geometric imperfection distribution, N-ordereigenmode imperfection method, is developed. The elasto-plastic stability analyses of four types of commonly used single-layerreticulated domes were conducted with the random imperfection mode method, the eigenmode imperfection method and the N-ordereigenmode imperfection method, respectively, by means of ANSYS. The results show that, though the random imperfection modemethod can simulate the initial geometric imperfection distribution realistically, the calculation cost of this method is too large topopularize in design practice. Adopting the first order eigenmode to simulate the distribution of initial geometric imperfection mayfail to derive the most unfavorable buckling load. The reliability of buckling load obtained from the eigenmode imperfection methodcannot be guaranteed effectively. The N-order eigenmode imperfection method can evaluate the influence of initial geometricimperfection on structural stability reasonably, and capture the buckling load satisfying the requirement of the ‘3σ’ principle with lesscalculation. This method is a convenient and efficient way for designers to estimate stability performance of single-layer reticulatedshells accurately and safely.
Kairong Shi,Wenzhi Pan,Zhengrong Jiang,Junfeng Lv 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.73 No.2
Steel spherical hinged bearings have high loading capacity, reliable load transfer, flexible rotation with universal hinge and allowance of large displacement and rotation angle. However, bearings are in complex forced states subject to various load combinations, which lead to the significant influence on integral structural safety. Taking the large-tonnage complex steel spherical hinged bearings of Terminal 2 of Guangzhou Baiyun International Airport as an example, full-scale rotation and shear behaviour tests of the bearings subject to axial tensile load are carried out, and the corresponding finite element simulation analyses are conducted. The results of experiments and finite element simulations are in good agreement with the coincident development tendency of stress and deformation. In addition, the measured rotational moment is less than the calculated moment prescriptive by the code, and the relationship between horizontal displacement and horizontal shear force is linear. Finally, based on these results, the rotation and shear stiffness models of bearings subject to axial tensile load are proposed for the refinement analysis of integral structure.
Shougang Duan,Yufeng Yang,Yong Dong,Yu Wang,Beibei Jiang,Chuanqiang Li,Zhengrong Zhang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.6
Ultra-fine grain AlCrFe2Ni2Wx(x = 0.1, 0.2, 0.3, 0.4) alloys were designed and prepared by vacuum arc melting, and correspondingmicrostructural evolution and mechanical properties were investigated. All of the alloys show a mixed structurewith FCC + BCC (B2) + TCP phases. The addition of W element has a significant effect on the formation mechanism of themorphology, which promotes the transition from FCC phase to μ phase and inhibits the spinodal decomposition of BCCphase. With the increase of W content, more μ phase precipitates from the FCC phase and grain boundaries. After the dissolutionof W element into matrix, the formed oversaturated solid solution and precipitated μ phase have the effect of solidsolution strengthening and second phase strengthening, respectively. The yield strength and Vickers hardness increasesfrom 765 to 1319.6 MPa and HV 332.2 to HV 461.8, respectively. The addition of W element enhances the strength of thealloys but reduced ductility. The AlCrFe2Ni2W0.1alloy exhibits outstanding comprehensive mechanical properties, with itsfracture strength reaching 2726.5 MPa and a considerable compressive strain of 43.3%, which implies promising potentialengineering application.