Truss Bridge 30 Facts

-          A truss is an arrangement of structural members that are connected together to form a rigid frame work.

-          Trusses have been used extensively in bridges since the early 19th Century.

-          Truss bridges are usually categorized in two different ways according to the location of the deck and according to the orientation of the vertical and diagonal members.

-          The Structural Stability of a truss is stable if all of its members are arranged in a network of interconnected triangles.

-          The triangular arrangement of members ensures the rigidity of a truss structure.

-          To fix an unstable truss, look for any "panel" of the structural model that is not a triangle, then add one or more members to transform that panel into a series of interconnected triangular  shapes.

- Modern trusses are made of structural steel.

- Some other types of bridges include arch, suspension, cable-swayed, and beam.

- Dunlap’s Creek Bridge was the first iron bridge built in the United States.

- The bridge was a vital link in the newly constructed National Road, which was the first important road built with Government funds.

- Dunlap’s Creek Bridge consisted of five parallel cast iron tubes spanning 80 feet.

- Dunlap’s Creek Bridge was built by Captain Richard Delafield of the Corps of Engineering.

- Dunlap’s Creek was designated a National Historic Civil Engineering Landmark in 1978.

- Truss bridges are usually categorized in two ways depending on the location of the deck and orientation of diagonal and vertical members.

- The deck truss has its deck located at the top chord.

- A through truss has its deck located at the bottom chord.

- A pony truss is like a through truss, but not as high and has no lateral bracing.

- Truss configurations are based on orientation of members.

- A number of standard truss configurations are commonly used in bridge structures.

- These configurations are defined primarily by the geometry of their members.

- Three of the most common standard configurations are Howe, Pratt, and Warren trusses.

- These trusses are named after the 19th century engineers who developed them.

- The major components of a typical truss are verticals, chords, diagonals, floor beams, deck, pinned support, roller support, and abutment.

- Loads include the weight of a bridge and vehicles that are on them.

- Loads can also include weather, such as snow.

- These forces must all be considered when developing a bridge.

- Yield stress is the strength of a metal.

- The strength of a metal must be determined before building a bridge.

- Supporting structures, such as beams and wires, are used commonly in bridges.

Bridge Definition

Antonio Johnson

5/9/11

Block#1

Definition

Tension - the act of stretching or straining.

Compression - the act of compressing.

Through Truss – a truss whose deck is located near the bottom chord.

Pony Truss – it is not as big as a regular trust because of its no lateral bracing between the top chords.

Deck Truss – a truss whose deck is located near the top chord.

Force – a load that is applied to a structure.

Load – forces applied to a structure.

Deck – is the floor of a bridge.

Yield Stress – is the strength of a metal.

Span –is its length from support to support.

Buckling – is the failure mode of a member that is located in compression.

3rd Try Reflection

In first block we tried to do an invention playhouse. From the Smithsonian Institution's National Museum of American History comes this wonderful resource for developing logical thinking, problem-solving, and collaboration - in students of any age level. There are four interactive puzzles - Puzzle Blocks, Cloud Dreamer, Word Play, and the especially addictive Tinker Ball - and all lend themselves to collaborative decision-making, innovative thinking, and a lot of just plain-old fun! This page is part of the larger site which deals with play as invention and invention as play. It's good to remember the preceding sentence should you need to justify your 73d attempt to get that darn Tinker Ball into the little cup!

Puzzle Reflection

In first block we created a puzzle on the computer. Puzzle Pirates is a historical-social MMORPG that casts the player as a pirate in an ocean town. To advance, one must play minigames that are patterned after traditional pirate and sailing tasks or games. Through playing on-board games, a group may sail a ship out to earn in-game gold pieces, which may then be exchanged for goods and services. Players may also wager on many of the minigames, as well as engage in several forms of PvP through them. While the basic game is free, there are certain places and opportunities off limits to free accounts. Also, some of the minigames and competitions only run one or two days a week for non-subscribers/premium customers. There are two forms of paid upgrades - subscriptions cost $9.95 a month, or an a la carte option (doubloons) may be purchased indvidually.

Puzzle

3rd Try

4 Slides About Me

PowerPoint

In first block we did powerpoints. Our teacher showed us all the links on a powerpoint page and what the meaning for them. At first, I did not really know how to really use a powerpoint but know I know how. I learned that powerpoints allow you to produce presentations, slides, handouts, speaker's notes, and outlines. I found out an easier way to start my powerpoint. I found out that you can type your stuff in the font even if its done or doesn't have the layout and etc. on it. Some of the buttons on the powerpoint is like an easy access to some things on the powerpoint. I learned that the slide sorter shows the powerpoint bullets and numbered. On design you get to choose how you want your background. For view you get to choose how you want your font to be set either to a normal, slide sorter, notes page, or reading view. It is really important that you have bullets in each slide if you have sentences in it. Every slide must have a heading on it for us to know what you are talking about on the slide. To make this powerpoint look more professional by using a better backgroud that will catch the viewers eyes. I would use more big words in my slides to make my powerpoint more interesting. I will also put more pictures up to bring out what I am talking about in the slide.

Wind Turbine Reflection

In First Block we did a wind turbine with paper. It was really hard to do and create. It took alot of concentration and focus to finish the project. We had to put together a machinery wind turbine made out of paper. One problem that I had was that my turbine did not spin that well. It was because I did not focus on what I was doing. I was losing parts and I did not get it tested before trying it. A wind turbine takes alot of time and focus. A wind turbine is a device that converts kinetic energy from the wind into mechanical energy. Wind Turbines are the best nuclear energy creations yet.

Wind Turbine

A wind turbine is a device that converts kinetic energy from the wind into mechanical energy. If the mechanical energy is used to produce electricity, the device may be called a wind generator or wind charger. If the mechanical energy is used to drive machinery, such as for grinding grain or pumping water, the device is called a windmill or wind pump. Developed for over a millennium, today's wind turbines are manufactured in a range of vertical and horizontal axis types. The smallest turbines are used for applications such as battery charging or auxiliary power on sailing boats; while large grid-connected arrays of turbines are becoming an increasingly large source of commercial electric power. It is hard to work with these turbines. you have to make it so that the wind will blow on it easily. Wind turbines have a nice spin on them to help make nuclear energy. If you don't know it or not, but wind turbines is what help keeps the electricity going. Take one day out of your busy schedule and try and create a wind turbine.

1st post blogging

A blog is a type of website or part of a website . Blogs are usually maintained by an individual with regular entries of commentary, descriptions of events, or other material such as graphics or video. Entries are commonly displayed in reverse-chronological order. Blog can also be used as a verb, meaningto maintain or add content to a blog.
Most blogs are interactive, allowing visitors to leave comments and even message each other via widgets on the blogs and it is this interactivity that distinguishes them from other static websites.
Many blogs provide commentary or news on a particular subject; others function as more personal diaries. A typical blog combines text, images, and links to other blogs, Web pages, and other media related to its topic. The ability of readers to leave comments in an interactive format is an important part of many blogs. Most blogs are primarily textual, although some focus on art (art blog), photographs (photoblog), videos (video blogging), music (MP3 blog), and audio (podcasting). Microblogging is another type of blogging, featuring very short posts.