LECTURE 3 - DRAINED AND UNDRAINED BEHAVIOUR ANALYSIS
BY
Harry Tan Siew Ann - Centre for Soft Ground EngineeringNational University of Singapore
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Water hammer on main kitchen tap, caused I think by dodgy piping next door:
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1940 Tacoma Narrows Bridge
Slender, elegant and graceful, the Tacoma Narrows Bridge stretched like a steel ribbon across Puget Sound in 1940. The third longest suspension span in the world opened on July 1st. Only four months later, the great span's short life ended in disaster. "Galloping Gertie," collapsed in a windstorm on November 7,1940.
The bridge became famous as "the most dramatic failure in bridge engineering history." Now, it's also "one of the world's largest man-made reefs." The sunken remains of Galloping Gertie were placed on the National Register of Historic Places in 1992 to protect her from salvagers.
A dramatic tale of failure and success
The story of the failure of the 1940 Narrows Bridge and the success of the Current Narrows Bridge is a great American saga. When Galloping Gertie splashed into Puget Sound, it created ripple effects across the nation and around the world. The event changed forever how engineers design suspension bridges. Gertie's failure led to the safer suspension spans we use today.
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The problem is this ---- "Error: DET<0" in the 1 phase
the answer from faq on plaxis site is
=====This error in iterative solver can be caused by:
*1- Not enough memory (or too many elements for the current memory)
* 2- Badly shaped elements: good elements are those with the same size for width, length and height of the element.
*3- Large stiffness differences in your model (e.g. a difference ratio > 1E6). This also includes the use of structures (beams, walls)
So please check your mesh (both 2D and 3D) in detail, and check if you use large stiffness differences in the used materials. Sometimes a hint is given by the program: if you e.g. activate a plate in phase 4, and this phase shows the error, it is likely that the used stiffness for the plate is too high for the numerical model.======
for *1 i have 4gb ram
for *2 all the piles have the same size
for *3----well this is the problem...i do not fully understant want they want to say.......i use this pb for about 2 weeks so i am new at this......
maybe someone can help me with an answer or to resolve the problem
i have atached the work files
thank you in advance
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It would be highly helpful for me, if anybody of this forum can provide me this great book.
Book Info:
Applied Groundwater Modeling: Simulation of Flow and Advective Transport
Writer: Marry P. Anderson & William W Woessner
Language: English
Academic Press (2002), Elsevier, USA
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