Shape optimization and buckling analysis of novel two-way aluminum alloy latticed shells
01 Apr 2021-Journal of building engineering (Elsevier)-Vol. 36, pp 102100
TL;DR: In this article, a two-way aluminum alloy cable-stiffened single-layer latticed shell is proposed to explore a shape optimization procedure of such structure, and the buckling behavior of the optimized structures and classic cylindrical latticed shells are examined and compared.
Abstract: The circumferential profile of cylinder, as a classic shape, has been widely adopted in single-layer latticed shells. Previous research into these structures primarily concentrated on their buckling behavior. In this work, a novel two-way aluminum alloy cable-stiffened single-layer latticed shell is proposed to explore a shape optimization procedure of such structure. In addition, the buckling behavior of the optimized structures and classic cylindrical latticed shells are examined and compared. The optimization procedure adopts a linear algorithm, in which the structural strain energy is selected to be the optimization objective. Buckling analyses are also performed to compare the buckling behavior of this novel latticed shell with classic cylindrical and optimized shapes. The comparisons show that the load-carrying capacities are clearly enhanced by optimizing the shell shapes. The results presented in this article are anticipated to aid engineers in the design of two-way aluminum alloy latticed shells with an optimal shape.
TL;DR: This work proposes a novel strategy for crossarm length optimization of PSSCs based on multi-dimensional global optimization algorithms based on a multi-population genetic algorithm introduced in the optimization process.
TL;DR: In this article, a series of tests were performed on 2.4 m cable-stiffened steel columns with two different crossarm-main column connection types (i.e., rigid and scissor types) and the effects of crossarm length and initial pretension on the load carrying capacities of CSSCs were also studied experimentally.
TL;DR: In this paper, the buckling resistance of a cable-stiffened aluminium alloy column is investigated under two different boundary conditions (i.e., fixed and pinned supported) at the column ends and two different crossarm-column connection types (e.g., rigid and pin-connected).
Abstract: The primary material of cable-stiffened columns in the past is steel. However, the study employs aluminium alloy, which is lightweight and recyclable, to form a cable-stiffened aluminium alloy column. The buckling resistance of the stiffened aluminium alloy column is investigated. Two different boundary conditions (i.e., fixed and pinned supported) at the column ends and two different crossarm–column connection types (i.e., rigid and pin-connected) are considered in the analysis. First, linear buckling behaviours are numerically examined via the commercial Software ABAQUS, and typical buckling modes and loads were demonstrated in this stage. By adopting an optimisation method based on linear theory, the crossarm lengths of the cable-stiffened aluminium alloy columns are calculated. Finally, nonlinear buckling analysis is performed to examine actual buckling resistances of columns with optimal crossarm lengths, and stability behaviours of the cable-stiffened aluminium alloy column are also compared with that fabricated from steel.
TL;DR: In this paper , the authors evaluated the impact of earthquake directionality on the structural response as well as the response pattern of the structure under frequent and rare earthquake actions, and highlighted that three-dimensional grid-type mega-latticed structures should be prioritized designing structures with spans of 800 m.
Abstract: With changes in the city environment and advances in engineering technologies, there is an increasing demand for the construction of super-large span city domes that can cover a large area to create a small internal environment within a specific region. However, the structural design must overcome various challenges in order to break the current structural span limitations. Moreover, there is little research on structures achieving such large spans. The seismic performance of the selected Kiewitt-type, Geodesic-type, and Three-dimensional grid-type mega-latticed structures is further investigated upon previous studies of the model selection, static and stability analysis results of the 800 m span mega-latticed structures. Finite element models were established with ANSYS to analyze the modal properties and earthquake response of the structures. The study evaluated the impact of earthquake directionality on the structural response as well as the response pattern of the structure under frequent and rare earthquake actions. It was found that the overall integrity of the structures is good, with strong coupling effects in three directions. The multi-dimensional seismic input method should be applied to solve the structural response. Combining the plastic development of the structure under rare earthquakes, the top and the circumferential trusses of the third and fourth rings are relatively weak parts of the structures. According to this study, given the known static analysis results, the maximum displacement and maximum stress of the structures under frequent and rare earthquake actions can be estimated. Furthermore, the study highlights that Three-dimensional grid-type mega-latticed structures should be prioritized designing structures with spans of 800 m, providing helpful guidance for the practical application of this type of structure.
TL;DR: In this paper, the structural stability performance of aluminum alloy single-layer latticed shell was analyzed with nonlinear finite method and the suggested values of rise/span ratio and initial imperfection were presented.
Abstract: In recent years, aluminum alloy single-layer latticed shell has been extensively used in civil and industrial infrastructure. The elasticity modulus of aluminum alloy is low, the rigidity of aluminum joints are weak and the roof load transmission path is different. Therefore, the stability performance of this dome is unique. To clarify the stability performance of aluminum alloy single-layer latticed shell, over 500 aluminum alloy single-layer spherical latticed shells were analyzed with nonlinear finite method. The suggested values of rise/span ratio and initial imperfection were presented. The influencing coefficients of initial imperfection, material nonlinearity and stressed skin effect on stability bearing capacity were obtained. And the structural stability safety coefficient and the approximate calculation formula for stability bearing capacity of aluminum alloy single-layer spherical latticed shell were derived. The influences of joint semi-rigidity were investigated. All the aforementioned results provide a scientific basis for future stability design of aluminum alloy single-layer spherical latticed shell structure.
TL;DR: In this article, the buckling performance of single-layer reticulated shells with aluminium alloy gusset (AAG) joints has been investigated, and it is indicated that the semi-rigid behaviour of AAG joints had a significant effect on the buckled performance of K6 shells.
Abstract: The single-layer reticulated shell with aluminium alloy gusset (AAG) joints is an innovative space structure system, and has been widely used in the building engineering. According to the bending behaviour of AAG joints obtained from the theoretical formulae, the finite element (FE) models of K6 AAG joint shells were established in the ANSYS program. The buckling performance of K6 shells with semi-rigid and rigid joints was discussed. It is indicated that the semi-rigid behaviour of AAG joints had a significant effect on the buckling performance of K6 shells. To develop a further understanding, parametric studies were performed, varying the span-to-thickness ratio, height-to-span ratio, ring, member section, joint bending behaviour, joint stiffness model, material property, load distribution, support condition and initial geometric imperfection. It is found that the effects of these parameters on the elasto-plastic stability of K6 shells with rigid and AAG joints were different obviously. At last, to predict the elasto-plastic buckling load of AAG joint shells, theoretical formulae were proposed on the basis of the FE results of more than 8000 shell models.
TL;DR: In this paper, a two-phase optimization method for designing the shape and thickness of shell structures consisting of orthotropic materials is presented, where the first phase is shape optimization, and the second phase is thickness optimization to decrease the compliance further.
TL;DR: With his knowledge of spatial geometry, shell theory and manufacturing processes, the structural engineer was able to further develop light and transparent glass roofs as mentioned in this paper, which are attractive from an a...
Abstract: With his knowledge of spatial geometry, shell theory and manufacturing processes, the structural engineer is able to further develop light and transparent glass roofs. They are attractive from an a...
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