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Jinlei Liu,Nanhai Zhu,Lujun Chen,Xiang Liu 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.3
Topology optimization and additive manufacturing are of particular importance in solving the problems of stress concentration, excessive steel consumption, and excessive displacement in spatial structure joints. In this work, we investigate the best topological form for such joints under multi-objective topology optimization (MTO). We conducted a single-objective topology optimization (STO) analysis on the joint fi rst, in the optimization process, the infl uences of penalty parameters, minimum member size, symmetry constraints, and the checkerboard phenomenon were comprehensively considered. Through comparative analysis, the optimal values for various load conditions were obtained, according to the optimal value obtained by STO, the MTO calculation of joint is carried out by using the compromise programming method. Then, the Nurbs modeling method is used to redesign the preliminarily optimized result, and the smooth joint is obtained. The mechanical performance of single-condition and multi-condition, MTO and STO, MTO joint and hollow sphere joint are compared with the same steel consumption. The results show that the mechanical performance of the joint obtained by MTO is more uniform than those obtained by STO, and the mechanical performance of the joint obtained by MTO is better than those of hollow sphere joint under the same steel consumption. Finally, the optimized joints were fabricated via additive manufacturing, which produced joints with novel shapes, smooth surfaces, and light weights.
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Redundancy of Single-layer Dome under Earthquake Action Based on Response Sensitivity
Ji-hong Ye,Nanhai Zhu 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.1
Structural redundancy is an important component of structural robustness that reflects the security of the structure under the influence of damage. In this paper, a method based on the response sensitivity is proposed for the assessment of the redundancy of a structure under earthquake excitation, and the response sensitivity is defined as the derivation of element strain to the elastic modulus of the structural materials. The redundancy analysis is carried out for three models of Kiewitt-6 single-layer reticulated dome built at a scale of 1:10 and subjected to earthquake action. The calculated redundancies and the results from the shaking table tests of the three models show that the members damaged by a severe earthquake are characterized by a small redundancy. The redundancy is able to reveal the weak links in the structure, and it represents the importance of the member in the structure. Members with small redundancy are identified as structural weaknesses that are easily damaged under loads, and their failure may cause catastrophic consequences to the dome. Such members are the key components of the structures.
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