Effectively the deck acts as a tension tie, and is supported by hangers from the arch above. This form is suited to the soft soils of river banks, where the ground cannot withstand the large horizontal thrusts from arching action. Steel arches in one form or another have been used for spans ranging from 30m to m. Cable-stayed bridges are a recent adaptation of the suspension bridge principle. The deck structure is supported by tension stays sloping from one or more towers.
The towers act in compression and can have a variety of forms A-frame, H-frame or columns. The deck girders sustain compression forces as well as bending forces. The very large spans have only recently been feasible due to developments in dynamic analysis, and methods for damping oscillations. In terms of aesthetics, the low profile decks, striking towers and raking cables are effective and dramatic. Such bridges are usually landmark structures.
The deck of a suspension bridge is supported by vertical tension hangers, which are supported in turn by large tension cables extending over two towers from anchorage to anchorage. The suspension concept dates back to antiquity, and it is because of their fundamental simplicity and economy of structural action that suspension bridges are used for the longest of modern bridge spans. A stiffening girder running the full length of each span is an essential part of a suspension bridge.
It distributes the concentrated traffic loads and provides stiffness against bending, twisting and oscillation. For single decks, the trend is to use box girders to minimise weight and give maximum torsional stiffness. However, where twin level decks are required for example, to carry road traffic and railway traffic then the general trend to use truss girders. Aesthetically, the graceful curve of the suspension bridge combined with the strong visual line of the deck give a pleasing effect.
The term is used to refer to a bridge-like structure which is movable. Typically, a drawbridge opens up to extend over the distance it is meant to span. A castlebridge, for example, opens like a door, serving as a doorway to the castle. It could be in the form of a plank that is pivoted to the center that rotates along a designated circumference. Sorry, but copying text is forbidden on this website.
Get Full Essay Get access to this section to get all help you need with your essay and educational issues. Types of Bridges Essay Sample There are 4 major types of bridges.
There are five different basic types of bridges: Box girder bridges Box girders are a particular form of plate girder, with two webs joined by common top and bottom flanges. Truss bridges A truss is a triangulated framework of elements that act primarily in tension and compression. Arch bridges In the traditional form, a steel arch has a similar structural action to old masonry arch bridges. Cable-stayed bridges Cable-stayed bridges are a recent adaptation of the suspension bridge principle.
Suspension bridges The deck of a suspension bridge is supported by vertical tension hangers, which are supported in turn by large tension cables extending over two towers from anchorage to anchorage. Copying is only available for logged-in users.
If you need this sample for free, we can send it to you via email Send. The words you use in your bridge sentences help define the relationship between the paragraphs or ideas you seek to connect. Words such as "consequentially," "therefore" or "accordingly" demonstrate a cause-effect relationship. Words like "whereas," "although" or "nevertheless" establish a contrast between concepts, while "furthermore," "in addition" or "similarly" help you further expand an idea. The database based on Word Net is a lexical database for the English Language.
Writing Transitions DeAnza College: Writing with Style by John R. Resources Capital Community College Foundation: Guide to Grammar and Writing. Depending on which text editor you're pasting into, you might have to add the italics to the site name. Six Main Types of Bridges. Facts About Positive Effects of Homework. Who were the victims? Provide Factual or Historical Background as an Introduction In defiance of an Supreme Court ruling declaring the Indian Removal Act of unconstitutional, Federal and Georgian authorities proceeded to force the exodus of fifteen thousand members of the Cherokee Nation from their homes in Georgia to Oklahoma, hundreds of miles to the west.
In this essay, the writer really wants to discuss the differences between two kinds of rice, but he needs a reason. The reason is educate the Americans about different kinds of rice, so he begins by telling them what they think is wrong. This can be a very effective technique for pulling the reader into the essay because most people feel challenged when someone says what they think is wrong.
Many of the essay that you will write in literature classes will take this form. The writer begins by briefly summarizing and the story; then he connects that to his opinion about the story and one of the broader social issues the story might bring out. Often these types of essays are in response to essay questions the teacher assigned. Remember, your introductory paragraph is device that you made to draw the reader in to your essay, and to get them to understand your thesis statement.
Your introduction may actually be the last part of your essay that you finish even though it is first on the page.
A bridge is a structure which provides passage over an obstacle without closing the way beneath.
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Free Essay: Different Types of Bridges The quest for travel has always been one that man has tried to conquer. First, he traveled on foot, and then developed. Free suspension bridges papers, essays, and research papers.