AWWA M55 PDF

ATV A Standard vs. It is widely used in Europe and its content exclusively covers the methodology for calculations of all kinds of pipes. The recommended methodology of structural calculation is one of the ten chapters that the manual contains and is exclusive for HDPE pipes although the guidelines are common to the AWWA manuals of other types of pipes. The methodology basis used in this manual is the most used, almost exclusively, in the Americas. Another important difference is the way in which each methodology analyses the distribution of the filling soil load around the pipe.

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ATV A Standard vs. It is widely used in Europe and its content exclusively covers the methodology for calculations of all kinds of pipes. The recommended methodology of structural calculation is one of the ten chapters that the manual contains and is exclusive for HDPE pipes although the guidelines are common to the AWWA manuals of other types of pipes. The methodology basis used in this manual is the most used, almost exclusively, in the Americas.

Another important difference is the way in which each methodology analyses the distribution of the filling soil load around the pipe. Both methodologies are based on the theory of M. However, while the M55 AWWA manual takes this theory without modification assuming, as Spangler, that no horizontal active pressure will develop on the pipe, the A ATV standard does take into account the influence of this horizontal active pressure.

The ATV methodology is much more detailed regarding trench-pipe interaction and does a deeper analysis about the intervention of each of the variables.

While AWWA methodology does not distinguish between vertical or sloping trench walls, in the ATV methodology the inclination angle of the walls of the trench is an important variable. In the ATV the use of sheet piling or coatings to contain the walls of the trench, and its removal methodology once installed the trench fill, acquires importance.

However, these considerations are not taken into account by AWWA at any time. The ATV A methodology is more conservative when coming to the treatment of the "long term" analysis, especially in the case of thermoplastic materials, as it considers that the pipe will be permanently loaded in time and, therefore, it has to be always verified for every long term load using the materials long term properties creep module, ultimate stresses.

This is based on the theory that, if the pipe behaves like flexible and it is well installed i. On the other hand, AWWA requires less and easier to estimate data. This does not happen in AWWA, where, despite the fact that the bedding angle is actually considered, its real influence on the final results is very low.

Generally this is because of the differences in the treatment of buckling verification between both methodologies. However, what can be analyzed are the results that occur in one or another case. The influence of groundwater, especially for long term buckling verification, probed to be very important in the ATV, resulting pipes of a very high ring stiffness for big cover depths in the presence of groundwater pressures.

AWWA methodology verification for long term buckling in the presence of groundwater was also defining in most cases, but without reaching the magnitudes of ring stiffness of ATV. In the figure below an example can be seen of the obtained results i. However, what should be the choice of one or another methodology for calculating is the accuracy of each in terms of its correlation with reality.

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AWWA M55 ed1[1]

For an example, a project requires pipe stiffness of 5. In addition to this and in accordance with article 9. To qualify for this admission the producer must be able to prove this solution with static calculations. With Krah pipes, are able to provide any project with pipes of the precise stiffness that the project demands. It is useful to perform static calculations for pipes taking into consideration the specifications of each particular project.

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