D Bridge Origami Download Pdf
Fanny Lococo
Most of us are familiar with origami, the paper folding craft which originated in Japan and brings hours of either frustration or serenity, all depending on your ability to fold a crease at exactly the right point. What you may not have considered, however, is the possibility of applying the same principles of folding which allow origami enthusiasts to make such incredible models to building bigger structures that we can actually use in the real world.
The technology behind this build is as remarkably simple as it is fresh and innovative; the bridge expands like a concertina, a system which allows it to be extended safely and, crucially, without the use of a crane.
It is the lack of a crane as well as the relative strength and simplicity of the design which makes it so ideal for this application, as unlike other temporary bridges it can be ready for use within an hour. This could potentially help people evacuate dangerous areas when standard routes have been destroyed or otherwise obstructed and, although the design team is still pushing to improve their creation, early tests suggest that it works as planned. Best of all, when it is in its compact form this bridge is small enough to fit inside a car trailer, making it exceptionally portable.
Bridges come in all shapes, sizes, and materials. What makes a bridge the strongest? Find out in this fun activity as you build simple bridges with paper and test to see how much weight they can hold.
You probably found that a single, flat piece of paper could barely support its own weight, let alone any pennies. Folding the paper in half may have made it strong enough to support a few pennies. The more times you folded the paper in half, the stronger it got. Changing the shape of the bridge to give it vertical "walls" made it significantly stronger, and it could probably hold dozens of pennies. While a horizontal piece of paper is very easy to bend in the vertical direction, the vertical wall sections are very difficult to bend in the vertical direction, making the bridge very strong.
Have you ever tried bending a ruler? If so, you probably bent it in the "thin" dimension and not the "thick" dimension. It is much easier to bend one way than the other! In general, the shape of a material can dramatically affect its strength. Engineers take advantage of this fact when building bridges or other large structures. Most of the metal beams that support them have hollow cross-sectional shapes like circles, squares, or letters like "C," "U," or "I." These beams are very resistant to bending, but require far less material than a completely solid beam. This makes them more lightweight and less expensive, since less material is required. Alternatively, given a limited amount of material, you can make it very strong depending on how you shape it. This is what you discovered when building a bridge out of a single sheet of paper in this project. A flat piece of paper is very easy to bend, so it makes a very poor bridge. By folding the paper into different shapes, you can make a much stronger bridge, even though you did not add more material.
Building a paper bridge is a great way to explore physics and engineering principles in a fun and creative way. You will need sheets of copy paper, textbooks to be the supports of the bridge, and some small objects to test how much weight each paper bridge can hold. Make a flat bridge first, before moving on to creating a pleated bridge. This will let you see how the design differences have an impact on how much weight each bridge is able to hold
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Origami-based design holds promise for developing materials whose mechanical properties are tuned by crease patterns introduced to thin sheets. Although there have been heuristic developments in constructing patterns with desirable qualities, the bridge between origami and physics has yet to be fully developed. To truly consider origami structures as a class of materials, methods akin to solid mechanics need to be developed to understand their long-wavelength behavior. We introduce here a lattice theory for examining the mechanics of origami tessellations in terms of the topology of their crease pattern and the relationship between the folds at each vertex. This formulation provides a general method for associating mechanical properties with periodic folded structures and allows for a concrete connection between more conventional materials and the mechanical metamaterials constructed using origami-based design.
This paper deals with constructing mobile assemblies of Bennett linkages inspired by four-crease origami patterns. A transition technique has been proposed by taking the thick-panel form of an origami pattern as an intermediate bridge. A zero-thickness rigid origami pattern and its thick-panel form share the same sector angles and folding behaviours, while the thick-panel origami and the mobile assembly of linkages are kinematically equivalent with differences only in link profiles. Applying this transition technique to typical four-crease origami patterns, we have found that the Miura-ori and graded Miura-ori patterns lead to assemblies of Bennett linkages with identical link lengths. The supplementary-type origami patterns with different mountain-valley crease assignments correspond to different types of Bennett linkage assemblies with negative link lengths. And the identical linkage-type origami pattern generates a new mobile assembly. Hence, the transition technique offers a novel approach to constructing mobile assemblies of spatial linkages from origami patterns.
The schematic view of the experimental, two-unit scissors model for a real scale mobile bridge (called as MB1.0) is shown in Figure 1. When deployment starts from the stored state, the members are sloped gradually until the full span is reached. Moreover, because the deck is sated in MB1.0, the deck works with member as deployment progresses.
In the final stage of expansion the scissors deployment angle is 60 degrees. The total length of the span is 7.0 m and the height of the bridge is 2.0 m. The total weight of the bridge including structural parts such as main members, shafts, and pins is 8.4 kN. The aluminum alloy components are made of the three-chamber hollow section, which uses A6N01 material, is used for the main member, the plastic bending moment is 20.1 kNm, and the ultimate bending strength is 39.9 kNm. The deck on which vehicles travel (called the aluminum alloy deck, hereafter) consists of A6063 extrusion sections. Only the portion of the aluminum alloy deck on which wheel loads act was constructed, because of weight saving. Moreover, the deployment action aims at shortening the construction time by uniting and interlocking the scissors member and the aluminum alloy deck. The properties of the A6N01 material are: E = 61.0 GPa, σB = 198.8 MPa, and σy = 180.0 MPa, while for the A6063 material E = 68.0 GPa, σB = 150.0 MPa, and σy = 110.0 MPa.
The aluminum alloy deck was constructed of a steel pipe of φ = 20 mm which was pin-fixed at both ends. The loading plate, which supports a tire contact area, uses 175 mm 175 mm steel plate and the rubber board according to guidelines of Eurocode for bridge design.
Figure 8(a) and Figure 8(b) shows the strain distribution in case when the vehicle was located in the center of the bridge. Figure 8(a) portrays a mountain-shaped member which starts from supports, and Figure 8(b) pays attention to the member which is in a free state (the target colored in red). Moreover, a blue mark in the figure shows the position of the strain gage. It can be seen that the experimental and analytical values are smaller than maxima admissible strain (=2000 με) for loading vehicles until 13.8 kN. A maximum strain of about 500 με occurred in member intersection part, so the safety ratio was relatively large from the yield strain.
Ichiro Ario,Yuki Chikahiro, (2015) A New Type of Bridge, Mobilebridge to Super-Quickly Recover a Bridge. World Journal of Engineering and Technology,03,170-176. doi: 10.4236/wjet.2015.33C025
That was it! That simple act of asking for work was not only a game changer. It was thee game changer. Antonio was no longer folding and refolding, he was now connecting the dots. Students need money. Students are willing to work for money. Neighbors need things done. Neighbors are willing to pay for services. There needs to be a reputable bridge that connects the desire to work with those who need the services.
Create citation alert 1757-899X/926/1/012026 Abstract In order to ensure that the rescue workers can quickly cross the natural obstacles such as ditches and valleys to enter the disaster area when the traffic facilities are destroyed Seriously by natural disasters, a new type of developable bridge is designed. The design of the bridge is based on the theory of shear hinge and the one-dimensional shear hinge element is used as the basic element. Under the function of dead-weight, the bridge can be unfolded by rope traction. It can be locked into service state after being unfolded to the design position. In this paper, through kinematic simulation and finite element static analysis, the developability and bearing capacity of the developable bridge are verified. The results show that the deployable bridge can meet the design requirements.
Negative refractive index materials (NRIM) enable unique effects including superlenses with a high degree of sub-wavelength image resolution, a capability that stems from the ability of NRIM to support a host of surface plasmon states. Using a generalized lens theorem and the powerful tools of transformational optics, a variety of focusing configurations involving complementary positive and negative refractive index media can be generated. A paradigm of such complementary media are checkerboards that consist of alternating cells of positive and negative refractive index, and are associated with very singular electromagnetics. We present here a variety of multi-scale checkerboard lenses that we call origami lenses and investigate their electromagnetic properties both theoretically and computationally. Some of these meta-structures in the plane display thin bridges of complementary media, and this highly enhances their plasmonic response. We demonstrate the design of three-dimensional checkerboard meta-structures of complementary media using transformational optics to map the checkerboard onto three-dimensional corner lenses, the only restriction being that the corresponding unfolded structures in the plane are constrained by the four color-map theorem.
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