Abstract
The deployable bridge based on scissor structures is one of the effective methods to quickly restore traffic after natural and man-made disasters. Scissor structures have the advantages of high storage rate, lightweight, and convenient storage and transportation. However, when scissor structures are used as load-bearing structures, their stiffness and bearing capacity are low. In this study, a three-dimensional deployable bridge based on the cable-strengthened scissor structures was proposed. In addition to rapid expansion, steel cables were used to strengthen scissor structures to improve the stiffness and bearing capacity. Besides, the static loading comparative tests on cable-strengthened scissor structures and traditional scissor structures (cable-free scissor structures) were performed. The results show that the stiffness of the cable-free scissor structure is small, the bending moment of members is large, and the stress distribution is uneven. The stiffness of cable-strengthened scissor structure is significantly improved; the bending moment of members is significantly reduced; and the stress distribution in the member section is more uniform. It is proved that cables can be used to improve the stiffness and load-bearing capacity of scissor structures without affecting the deployability.
Highlights
Introduction and Background e deployable bridge system is an ideal solution for rapid traffic recovery after natural and man-made disasters. is bridge should have the characteristics of fast transportation, convenient installation, and rapid dismantling to meet the requirement of rapid erection and multiarea reuse in the assigned areas, and scissor structures can realize this goal
Scissor structures have a certain degree of freedom, which can be expanded from a compact packaged state to a large deployed state. is kind of structure is an ideal solution for deployable bridges
A three-dimensional deployable bridge based on a cable-strengthened scissor structure was proposed
Summary
E bridge adopts a deck structure; the upper part is a modular deck system; and the cable-strengthened scissor structure is used as the lower bearing structure. E lower bearing structure of the bridge is composed of the cable-strengthened scissor structure based on the modular design. Two steel cables are used to connect the upper and lower nodes of the cable-free scissor unit (Figure 2) to form a planar element (Figure 3). Similar to the planar element, the module can expand and contract freely without being affected by the steel cables.
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