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Category: Bridge design examples

This locks in compile-time binding between interface and implementation. The abstraction and implementation cannot be independently extended or composed.

There are two types of thread schedulers, and two types of operating systems or "platforms". Given this approach to specialization, we have to define a class for each permutation of these two dimensions.

If we add a new platform say Java's Virtual Machinewhat would our hierarchy look like? What if we had three kinds of thread schedulers, and four kinds of platforms?

Bridge Design pattern - Real time example [Shape]

What if we had five kinds of thread schedulers, and ten kinds of platforms? The number of classes we would have to define is the product of the number of scheduling schemes and the number of platforms. The Bridge design pattern proposes refactoring this exponentially explosive inheritance hierarchy into two orthogonal hierarchies — one for platform-independent abstractions, and the other for platform-dependent implementations. Decompose the component's interface and implementation into orthogonal class hierarchies.

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The interface class contains a pointer to the abstract implementation class. This pointer is initialized with an instance of a concrete implementation class, but all subsequent interaction from the interface class to the implementation class is limited to the abstraction maintained in the implementation base class.

The client interacts with the interface class, and it in turn "delegates" all requests to the implementation class. The interface object is the "handle" known and used by the client; while the implementation object, or "body", is safely encapsulated to ensure that it may continue to evolve, or be entirely replaced or shared at run-time. This is a design mechanism that encapsulates an implementation class inside of an interface class.

The former is the body, and the latter is the handle. The handle is viewed by the user as the actual class, but the work is done in the body. The idiom may reflect the sharing of a single resource by multiple classes that control access to it e. The Client doesn't want to deal with platform-dependent details.

The Bridge pattern encapsulates this complexity behind an abstraction "wrapper". Bridge emphasizes identifying and decoupling "interface" abstraction from "implementation" abstraction. The Bridge pattern decouples an abstraction from its implementation, so that the two can vary independently.The Bridge design pattern allows you to separate the abstraction from the implementation.

It is a structural design pattern. There are 2 parts in Bridge design pattern :. This is a design mechanism that encapsulates an implementation class inside of an interface class.

It becomes handy when you must subclass different times in ways that are orthogonal with one another. But the above solution has a problem. If you want to change the Bus class, then you may end up changing ProduceBus and AssembleBus as well and if the change is workshop specific then you may need to change the Bike class as well. You can solve the above problem by decoupling the Vehicle and Workshop interfaces in the below manner.

This article is contributed by Saket Kumar. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Writing code in comment? Please use ide. There are 2 parts in Bridge design pattern : Abstraction Implementation This is a design mechanism that encapsulates an implementation class inside of an interface class.

The bridge pattern allows the Abstraction and the Implementation to be developed independently and the client code can access only the Abstraction part without being concerned about the Implementation part.

The abstraction is an interface or abstract class and the implementor is also an interface or abstract class. The abstraction contains a reference to the implementor. Children of the abstraction are referred to as refined abstractions, and children of the implementor are concrete implementors. Changes to the implementor do not affect client code. Improved By : sunny94Nistelrooy.The design methods presented throughout the example are meant to be the most widely used in general bridge engineering practice.

The first design step is to identify the appropriate design criteria. This includes, but is not limited to, defining material properties, identifying relevant superstructure information, determining the required pier height, and determining the bottom of footing elevation. Refer to Design Step 1 for introductory information about this design example.

Additional information is presented about the design assumptions, methodology, and criteria for the entire bridge, including the pier. Concrete day compressive strength - For all components of this pier design example, 4. However, per the Specifications, 2. Pier cap and column cover - Since no joint exists in the deck at the pier, a 2-inch cover could be used with the assumption that the pier is not subject to deicing salts.

However, it is assumed here that the pier can be subjected to a deicing salt spray from nearby vehicles. Therefore, the cover is set at 2.

Footing bottom cover - Since the footing bottom is cast directly against the earth, the footing bottom cover is set at 3.

Superstructure data - The above superstructure data is important because it sets the width of the pier cap and defines the depth and length of the superstructure needed for computation of wind loads. It will be assumed here that adequate vertical clearance is provided given a ground line that is two feet above the top of the footing and the pier dimensions given in Design Step 8.

However, as a minimum, it should be at or below the frost depth for a given geographic region. In this example, it is assumed that the two feet of soil above the footing plus the footing thickness provides sufficient depth below the ground line for frost protection of the structure.

bridge design examples

Selecting the most optimal pier type depends on site conditions, cost considerations, superstructure geometry, and aesthetics. The most common pier types are single column i. For this design example, a single column hammerhead pier was chosen.

A typical hammerhead pier is shown in Figure Since the Specifications do not have standards regarding maximum or minimum dimensions for a pier cap, column, or footing, the designer should base the preliminary pier dimensions on state specific standards, previous designs, and past experience.Today we will look into Bridge Design Pattern in java.

When we have interface hierarchies in both interfaces as well as implementations, then bridge design pattern is used to decouple the interfaces from implementation and hiding the implementation details from the client programs.

Just like Adapter patternbridge design pattern is one of the Structural design pattern. The implementation of bridge design pattern follows the notion to prefer Composition over inheritance. If we look into bridge design pattern with example, it will be easy to understand. Lets say we have an interface hierarchy in both interfaces and implementations like below image.

Now we will use bridge design pattern to decouple the interfaces from implementation. UML diagram for the classes and interfaces after applying bridge pattern will look like below image. Notice the bridge between Shape and Color interfaces and use of composition in implementing the bridge pattern. Bridge design pattern can be used when both abstraction and implementation can have different hierarchies independently and we want to hide the implementation from the client application.

Keeping applyColor in both Color interface and Shape abstract class create confusion, both are different method keeping different name would have been good to avoid confusion. What do you mean by code is not displayed properly.

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The code is properly formatted using syntax highlighter. My browser seemed to have troubles to display the code examples.

Now it works again without making any changes. If I understood this article correct, first schema addresses the state before, and UML diagram addresses the state after applying Bridge pattern. In that case, RedColor and GreenColor would have been abstract classes meant to be extended from Triangle, or Pentagon. Triangle and Pentagon would have to implement Shape interface too. This make more sense according to the scheme drawing. Hi Pankaj, Thanks for the explanation.

I am not fully clear on the example. In the example we could create the color instances and pass it to the shapes.Please read our previous article where we discussed the Decorator Design Pattern in C with examples.

As part of this article, we are going to discuss the following pointers. In the bridge design pattern, there are 2 parts.

The first part is the abstraction and the second part is the implementation. The bridge design pattern allows the abstraction and implementation to be developed independently and the client code can access only the abstraction part without being concerned about the implementation part.

The Bridge Design Pattern separates the abstraction hierarchy and the implementation hierarchy in two different layers so that change in one hierarchy will not affect the development or functionality of other hierarchy. In order to understand the definition, please have a look at the following image. Suppose we have one requirement to save or delete an object in the persistence. Here, we can either save the object into a File System or into a database. So, on the right-hand side, you can see two implementers.

The FileSystemPersistenceImplementor is used to save the object into a file whereas the DatabasePersistenceImplementor is used to save the object into a database.

So, we can use any one of the above implementors to save an object.

LRFD Bridge Design Manual (BDM)

So, as per the Bridge design pattern, the abstraction and implementation should be in a separate layer. Here, the persistence is the abstraction layer and persistence implementation is the implementation layer. Now, if you want to add new implementation or if you want to remove any implementation, then it will not affect the Abstraction layer. This is the advantage of the bridge design pattern.

The abstract persistence layer will use any of the implementers to save or delete an object and the client will only use the abstraction to save or delete the object. Now if you read the definitions then you can easily understand the bridge design pattern. In the Bridge Design Pattern, there are two layers. The first layer is the Abstraction layer and the second layer is the Implementation Layer. Please have a look at the following image. On the left-hand side, you can see the abstraction.

The implementation will be done by the original TV implementer. So, the abstraction will use one of the implementers to turn on or turn off the TV. Suppose, later you want to add new implementation then you can do this in the implementation layer. For example, you can add new TV for example Panasonic TV in the implementation layer which will not affect the Abstraction layer. Like that, you can also add a new Panasonic TV remote in the abstraction layer without affecting the implementation layer.

So, this is one of the best examples of bridge design pattern. Note: First we will implement the example using the bridge design pattern and then we will try to understand the class diagram of the Bridge Design Pattern by comparing it with our example.

Let us implement the above example step by step using the bridge design pattern in C. This interface will be implemented by the implementation classes.Learn the basics to get started and then master techniques that help you get the most out of Structural Bridge Design. There are ten chapters, each containing a number of workshop examples that the user can work through using the application, by following the described procedures. Most workshops are simple and intended for relatively new users to the system but there are also some more detailed examples providing an insight into some of the more advanced capabilities of the software.

The main contents page gives the headings of the main chapters. These are hyperlinked in the document so clicking on a title will take the user directly to the appropriate section. The first page of each chapter shows the contents for that section, listing the workshops included.

This is also a hyperlinked page. Navigation to particular sections is made easier if the PDF bookmarks are made visible. Some of the examples require data files to be loaded or opened. All these files can be found in the following folder:.

At the end of some examples the user is asked to save a data file which may be used in a subsequent example. To prevent the overwriting of the supplied files different file names have been used. These files can optionally be used as input instead of the supplied data files if required.

An example of setting up template files is given in Chapter 1, which are saved in a user defined templates folder for use in subsequent examples. If it is required to work on an example without first carrying out Chapter 1 then please ensure that the template files provided are copied into an appropriate templates folder, which can be pointed to in the software using the Options Preferences The procedure for each example is given as a series of step by step instructions, making reference to data form names, field names, user input, menu items, etc.

To enhance the readability of these instructions some basic rules have been followed when preparing these instructions. Skip to main content. Autodesk Knowledge Network. Structural Bridge Design.

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Knowledge Forums Knowledge Learn the basics to get started and then master techniques that help you get the most out of Structural Bridge Design. Knowledge Forums. See More See Less. To translate this article, select a language.

By: Help. Help 0 contributions. In-Product View. Files Some of the examples require data files to be loaded or opened. Templates An example of setting up template files is given in Chapter 1, which are saved in a user defined templates folder for use in subsequent examples. Semantics The procedure for each example is given as a series of step by step instructions, making reference to data form names, field names, user input, menu items, etc.

Text in bold with a vertical bar separating words indicates a menu item e. Options Preferences Form names, data field labels and drop down lists are indicated as italic text such as Define Beam Loading. Text in double quotation marks generally indicates a button found on a data form or user input e.

Find related content. Get answers fast from product experts in the forums. Visit Structural Bridge Design Forums. Need Help?Integral abutments are used to eliminate expansion joints at the end of a bridge. They often result in "Jointless Bridges" and serve to accomplish the following desirable objectives:.

A jointless bridge concept is defined as any design procedure that attempts to achieve the goals listed above by eliminating as many expansion joints as possible. The ideal jointless bridge, for example, contains no expansion joints in the superstructure, substructure or deck. Integral abutments are generally founded on one row of piles made of steel or concrete.

Structures Design

The use of one row of piles reduces the stiffness of the abutment and allows the abutment to translate parallel to the longitudinal axis of the bridge. This permits the elimination of expansion joints and movable bearings.

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Because the earth pressure on the two end abutments is resisted by compression in the superstructure, the piles supporting the integral abutments, unlike the piles supporting conventional abutments, do not need to be designed to resist the earth loads on the abutments. When expansion joints are completely eliminated from a bridge, thermal stresses must be relieved or accounted for in some manner. The integral abutment bridge concept is based on the assumption that due to the flexibility of the piles, thermal stresses are transferred to the substructure by way of a rigid connection, i.

The concrete abutment contains sufficient bulk to be considered as a rigid mass. A positive connection to the girders is generally provided by encasing girder ends in the reinforced concrete backwall.

This provides for full transfer of forces due to thermal movements and live load rotational displacement experienced by the abutment piles. In the absence of universally-accepted design criteria, many states have developed their own design guidelines.

Bridge Design Pattern in Java

These guidelines have evolved over time and rely heavily on past experience with integral abutments at a specific area. There are currently two distinctive approaches used to design integral abutments:. The following discussion does not follow the practices of a specific state; it provides a general overview of the current state-of-practice.

Most states set a limit on the bridge length of jointless bridges beyond which the bridge is not considered a "typical bridge" and more detailed analysis is taken into account. Typically, the bridge length is based on assuming that the total increase of the bridge length under uniform temperature change from the extreme low to the extreme high temperature is 4 inches. This means that the movement at the top of the pile at each end is 2 inches or, when the bridge is constructed at the median temperature, a 1 inch displacement in either direction.

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This results in a maximum bridge length of ft. The maximum length is shorter for regions defined as having a "cold" climate.

The above length limits assume that the soil conditions at the bridge location and behind the abutment are such that the abutment may translate with relatively low soil resistance.

Appendix A - Examples

Therefore, most jurisdictions specify select granular fill for use behind integral abutments. In addition, the fill within a few feet behind the integral abutment is typically lightly compacted using a vibratory plate compactor jumping jack.

Subsequently, the holes are filled with sand. This procedure is intended to allow the piles to translate with minimal resistance. Earth pressure acts in a direction perpendicular to the abutments. For skewed bridges, the earth pressure forces on the two abutments produce a torque that causes the bridge to twist in plan. Limiting the skew angle reduces this effect. For skewed, continuous bridges, the twisting torque also results in additional forces acting on intermediate bents.

In addition, sharp skews are suspected to have caused cracking in some abutment backwalls due to rotation and thermal movements. This cracking may be reduced or eliminated by limiting the skew.

Limiting the skew will also reduce or eliminate design uncertainties, backfill compaction difficulty and the additional design and details that would need to be worked out for the abutment U-wingwalls and approach slab. Currently, there are no universally accepted limits on the degree of skew for integral abutment bridges. With relatively few exceptions, integral abutments are typically used for straight bridges.

bridge design examples

For curved superstructures, the effect of the compression force resulting from the earth pressure on the abutment is a cause for concern. For bridges with variable width, the difference in the length of the abutments results in unbalanced earth pressure forces if the two abutments are to move the same distance.

bridge design examples

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