Diagonal arrangement is a prerequisite for diagrid tube structures in preliminary design. Two scenarios made up of curved or varying-angle straight diagonals, all established by only two basic geometric variables, i.e. the bottom angle and the top angle of the control arc or straight diagonal, are evaluated under seismic and wind loads. Approaches to configuring diagrid tube structures of these two types are introduced graphically. A set of diagrid tube structures composed of curved and straight diagonals with various combinations of bottom and top angles, with height-to-width aspect ratios ranging from 3.6 to 9, are investigated focusing on the optimal geometries in terms of the material usage. By giving attention to both seismic and wind loads, the optimal values of bottom and top angles are suggested respectively for these two types of diagrid tube structures with different aspect ratios. Furthermore, the proposed method is validated by FEM analysis. Consequently, the structurally efficient use of diagrid tube structures with curved or varying-angle straight diagonals could be provided conveniently for both engineers and architects in preliminary design.
Twisted forms have been widely employed in high-rise buildings in recent years. The diagrid structural system is particularly suitable for twisted buildings because of its large lateral stiffness and unique architectural esthetics, but little research on twisted diagrid tube structures is currently available. This paper studies the influence of diagonal angle, twist rate, aspect ratio, corner column, and plan form on the lateral stiffness of twisted diagrids, and the optimal diagonal angle range is determined. Considering the stiffness and strength criteria, the design methodology of diagonal sizes of twisted diagrids is proposed, and the methodology is validated by finite element analysis. In addition, this paper presents a novel configuration of twisted diagrid, that is, the twisted diagrid with asymmetric diagonal angles. The influence of the left-and right-inclined diagonal angle on the lateral stiffness of twisted diagrids is investigated. It is found that twisted diagrid structure with asymmetric diagonal angles exhibits larger lateral stiffness than the symmetric case. The results in this paper are useful for engineers to determine the configuration and diagonal sizes of the twisted diagrid tube structures.
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