Bo Xu's Communities Activities

3D anisotropic plate - Diferent ratios for EI1/EI2 and EA1/EA2

Francisco Santos Marques — Wed, 30 Jun 2021 15:00:01 GMT

Hello PLAXIS team

I am interested to model a diaphragm wall in each both EI1 and EA1 ( vertical) are still 100% of the isotropic case, but EA2 and EI2 are reduced to 20% and 1% respectively. This is based on the Geotechnique paper (ZDRAVKOVIC et al 2005 - Modelling of a 3D excavation in finite element analysis) that recommends this approach to model the anisotropic behaviour of the diaphragm walls ( due to the joint discontinuity in the horizontal direction). See the table and figure below that illustrates what I am trying to accomplish

My question is how I can assign this in PLAXIS 3D?

It is my understanding that when trying to model an anisotropic plate in PLAXIS 3D, the program uses the inputted E1 and E2 to calculate an E1/E2 ratio. This ratio then is used to define both EI1/EI2 and EA1/EA2 ratios. Hence the EI1/EI2 and EA1/EA2 ratios cannot be specified separately.

Are there any plans for future PLAXIS 3D versions to allow to specify this ratio directly into the program? Is there any workaround to overcome this modelling limitation?

This approach is also applicable for secant or contig pile walls modelling.

Thanks

How to obtain shear force from "Dummy Plate approach" to model the wall?

Bo Xu — Thu, 13 May 2021 08:30:19 GMT

How to obtain shear force from "Dummy Plate approach" to model the wall?

The screen shot above only talks about how to calculate back the axial force and bending moment. How about the shear force then?

Thanks.

How to capture Exception in python scripting for new_server function?

Bo Xu — Wed, 30 Sep 2020 07:22:03 GMT

I tried to capture the exception case with the following code when the function of new_server is called with wrong scrpting server port ID or password.

========================================================================================

try:
s_o, g_o = new_server('localhost', outputport, password=outpass, error_mode=(RAISE))
except:
msgbox("Warning: the supplied scripting server port ID or password is not correct.")
sys.exit()

========================================================================================

However, it seems that the exception does happen even when I provide the correct port ID and password. Not sure how to get it to work. Thanks for help in advance.

Also, is it possible tp reset the port ID / password for the scripting server within the python code in the middle of the process? For example, after some tasks are completed, those settings will be re-set for the following tasks.

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Wed, 30 Sep 2020 06:13:28 GMT

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