Nov 28, 2011 in my engineering class were constructing truss bridges that will be tested for strength, weight, and efficiency. The building of balsawood bridges is very often used as an educational technology. Truss bridgethis bridge type has a superstructure composed of elements. The bridge students will build uses balsa wood sticks 2. Oct 03, 2016 introduction this report covers the initial ideation and design, construction, testing and failure analysis of a balsa wood truss bridge with span of forty inches, height of six inches and width of four inches and a weight of 5. How to build a simple toothpick bridge woodworking.
A balsa wood bridgebuilding project touches on principles of. You can see that where the slanted members of each k join together at the vertical member, there is an end joint. Introduction this report covers the initial ideation and design, construction, testing and failure analysis of a balsa wood truss bridge with span of forty inches, height of six inches and width of four inches and a weight of 5. Please practice handwashing and social distancing, and. Arman yosal, josia tannos, maya goldman, savannah brooks 2. To effectively and successfully design a truss bridge, several of. Its exciting to create a new project for your home, and we are happy to help you. Designs the warren bridge which is type a bare project consisting of. Resources to help you build a model bridge ideas wood structure bridge for 2019 truss bridges support the weight of a bridge by spanning a series of trusses from one end to the other, supporting the weight of the bridge beneath. Balsa wood bridge is a simple bridge structure made of small individual pieces or sticks of balsa wood. Oct 04, 2016 here is a bridge using the k truss design made from balsa wood. Kelly solutions manual pdf mechanical engineering design, free pdf books. Balsawood bridges by atorod azizinamini, david garber, and kingsley lau, accelerated bridge construction university transportation center, florida international university when learning about structural engineering, the building of balsawood.
You may use a successful design from west point bridge design or an existing bridge. Classic ktruss bridge design balsa wood garretts bridges. Here is a bridge using the k truss design made from balsa wood. Engineering mechanics coursework for meng mechanical engineering first year at sussex uni, warren truss design, watch at half speed for a slo mo effect. Build a truss bridge from balsa wood to carry the largest load to weight ratio. Use one top chord, one bottom chord, and four triangles. A model truss bridge can be made from balsa wood using any of these designs, or. To create a bridge out of balsa wood that can support an optimum weight but still be below mass limit. The design uses real structural materials, not popsicle sticks, balsa wood, or pasta. Place the triangles on top of the bottom and top chords. Mar 12, 2017 engineering mechanics coursework for meng mechanical engineering first year at sussex uni, warren truss design, watch at half speed for a slo mo effect. Balsa wood parker truss bridge construction time lapse.
For balsa wood, yellow wood glue thinned with water about 70% glue 30% water is a good choice. Worksheets are bridge basics, the bridge building adventure, bridge types forces work, science unit structures lesson 4 building bridges part 1, activity balsa wood bridge abc style, the bridge of vocabulary evidence based activities for, knex waip us, bridges pbs website work name. Your bridge will be tested on a universal testing machine. The most efficient bridge gets an a looking at 800 efficiency. Students work within constraints to construct model trusses and then test them to failure as a way to evaluate the relative strength of different truss configurations and construction styles. As they learn about everything from correctly placing abutments, piers, piles, and trusses to evaluating the effectiveness of a bridge, students are putting their engineering knowledge into practice by designing, building, and testing a balsa wood bridge. Introduction concept design methods construction techniques testing and performance post test evaluation conclusion 4. This is a playfulness intriguing project that will en. Adobe, the adobe logo, acrobat, the adobe pdf logo, distiller. This instruction set will teach you how to design and construct your own bridge made out of balsa wood. On graph paper, draw the side view of your truss bridge.
A model truss bridge can be made from balsa wood using any of these designs, or you can construct a truss bridge of your own design. Buy our balsa wood bridge kit classpack of 24 for your next physics lesson plan at educational innovations. The four most basic categories in the truss bridge arena are the warren, pratt, howe and k truss. Balsa wood truss bridge design group project project. See more ideas about bridge design, spaghetti bridge and bridge. Its strong, and dries quickly so you will save a lot of time, possibly enough time to build a test bridge and then improve the design. The desire is to optimize the design by maximizing load, minimizing material usage mass, stressing neatness, craftsmanship, and creativity. Strongest balsa wood bridge designs free pdf file sharing. Mountain use a diminished balsa wood adage about 3 instead of an exacto knife to balsa wood bridge plans make cuts yellow glues contain aliphatic resin used indium the majority of taking bridges. Many high school and college science and engineering classes wi.
The ks were the most challenging part of the build, because i had to calculate each ones length, and the approximate measure of the angle i had to cut into each one. Build balsa wood bridge building projects diy pdf bench. Angstrom balsa wood the building of balsa wood bridges is very frequently used equally an educational technology. In learning about bridge typesarch, beam, truss and suspensionstudents explore the effect of tensile and compressive forces. Apply a thin coat of wood glue where the chords and triangles touch and clamp with binder clips. A sample of some of the different types of bridges is shown below.
A balsa wood bridge construction project is ideal for modelling in schools where a small group of 2 4 persons are making the model together over 5 or 6 building sessions. The pratt and howe truss also uses triangles, but the triangles are slanted to change the distribution of weight. In my engineering class were constructing truss bridges that will be tested for strength, weight, and efficiency. Feb 9, 2018 balsa wood parker truss bridge construction time lapse. We supply the materials to create your truss and we assist you in the planning and product estimation.
Balsawood bridges by atorod azizinamini, david garber, and kingsley lau, accelerated bridge construction university transportation center, florida international university when learning about structural engineering, the building of balsawood bridges can be a key activity in any engineering class. Items needed for all activities are listed in the teacher guide. Typically classes which would include a balsa wood bridge cover the subject areas of physics, engineering, static equilibrium, or building trades, although it may be done independently of any of these subjects. Load test 14 december 2011 truss bridge competition.
The type of bridge and material used is dependent on many different factors. For this balsa wood bridge, i used a ktruss design with seven vertical members and 6 ktrusses per side. Build balsa wood bridge building projects diy pdf bench with shoe rack plans. Howe iv im building a bridge forbidden of balsa sir henry wood strips for school and wanted some currently i was planning on antiophthalmic factor warren truss type form but. It may be accompanied by a larger project involving varying areas of study. Truss worksheet thank you so much for your interest in our products. Aug 08, 2018 as they learn about everything from correctly placing abutments, piers, piles, and trusses to evaluating the effectiveness of a bridge, students are putting their engineering knowledge into practice by designing, building, and testing a balsa wood bridge. The k truss uses the same shape as the letter k to distribute weight. The length of these joining members will determine the width of the bridge. Ap physics balsa wood bridge testing 2015 ap physics, wood. Activity guides and curriculumteachers guides grades. Join the two truss segments together, side by side to form the bridge, by linking them with more 18inch balsa strip stock segments wherever there is a joint between two or more pieces in the trusses. Introduction concept design methods construction techniques testing and performance post test evaluation.
How to build balsa wood bridge building projects pdf download blueprints fine woodworkingcomplan store ap physics project 20 video. Dec, 2017 for this balsa wood bridge, i used a ktruss design with seven vertical members and 6 ktrusses per side. Ultimate bridge builder kit popsicle stick bridge schematic. The following calculations are a manual verification of the test. To aid in the exploration for possible truss design alternatives, we will model and analyze the trusses using. The size and complexity of the bridges can be varied to match abilities from 810 year olds all the way up to architecture and engineering degree students. This is a fun, intriguing project that will entertain an individual for hours. Balsa wood bridge grading rubric free pdf file sharing.
Oct 03, 2016 final presentation balsa wood bridge design 1. Posts about build wood rope bridge written by read the article combined model train building worksheets are beds made of balsa wood. Besides the glue and a sharp cutting blade, students will need approximately 30 sticks each 61 cm or 2 ft in length. Balsa wood bridge abc style introduction bridges come in many different shapes and sizes, and can be made out of an assortment of materials. Nov 08, 2014 weight and failure of a balsa wood bridge design failure. Ultimate bridge builder kit popsicle stick bridge schematic page 2 4 d d bridge sides. Angstrom balsa wood the building of balsa wood bridges is. The building of balsa wood bridges is very often used as an educational technology. Truss worksheet faux wood beams the look of natural. Bridge building project the above link will take you to a complete lesson plan for. Realworld trusses cant be optimized the way a balsa wood bridge can, because realworld trusses have to carry many different combinations of load, and a truss optimized for one set of loads wont be optimal for another set. Within each group, each student builds two exact copies of the teams. Balsa wood bridge building instructions figure 1 figure 2 figure 3.
What was the breaking force of the first balsa wood beam bridge. Each utilises the basic triangle design, characteristic of the truss bridge, however, each varies slightly in the way they distribute compression and tension. Which type of balsa wood bridge is more efficient arch. My bridge design must have a span of 25 cm and minimum 5x5 cm inside dimension.
In early truss bridges, all of these members would have been made of wood or iron. Engineering bridges 8th grade career and technology education. Building a bridge from balsa wood is such a popular educational activity that there are competitive contests for building model bridges. Equipment and materials needed to complete guide activities include the balsa bridges getting started package as well as other tools and materials. Students can also use toothpicks and popsicle sticks as alternate materials. This bridges uses a combination of end and lap joints. Feb 07, 2019 classic ktruss bridge design balsa wood garretts bridges. The video shows a balsa woodwind bridge built for balsa wood bridge project report a statics the bridge ended up with an. Engineering bridges 8th grade career and technology.
The pitsco 59460 balsa bridges teachers guide by dana cochran isbn. The balsa bridges teachers guide contains iteea standards, ccss math, and ngss addressed. Notice the difference in resistance between 1 balsa wood beam and 3 stacked beams when. I was thinking the pratt or warren design would be most efficient, but im stuck on how to figure out dimensions. At the top and bottom chords, the joint is a lap joint.
Cablestayed bridge suspension bridge truss bridge bridge type posters arch bridges beam bridges cablestayed bridges suspension bridges truss bridges curriculum page number the bridge basics program kithas been produced in partnership with the construction industry round table cirt. Each student group uses popsicle sticks and hot glue to build a different truss configuration from a provided diagram of truss styles. Draw it so that it is between 8 and 11 inches long and between 1. Balsa bridge fun projects for kids, crafty kids, roof.
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