Dear Seboui Hatem ,

There are no theoretical methods which will give you precise results related to determination of the mechanical properties of URM buildings. To be able to get more or less good basis to solve this task you need to carry out experimental investigations on the samples of walls under the loading corresponding to the real

loading of the considered building. Only using the obtained experimental results you can analyze your building.

The other characteristic which maybe of help is the period of vibrations (T) of your structure. According to my experience the value of T for URM buildings up to 5 stories could be T=0.055n, where n - is the number of stories. Thus, if by analyzing your building model you will receive T close to the suggested value, then you are in the correct way. Also, it would be very good to measure T directly on site on the full-scale buildings of URM type.

Best regards,

Prof. Dr. Mikayel Melkumyan

thnks

Dear Seboui Hatem ,

You can use the below methods to assess the mechanical properties of Historical Masonry Materials: 1. The literature review advises. 2. Similar materials used in other places that ND tests or SD tests done for these. 3. ND and SD tests (such as: Schmitt Hammer; UntraSonic) 4. The Numerical models for unit and mortars in FE software and determine the stress-strain curve of these materials. 5. X-ray diffraction laboratory test to identify materials components. (XRD and XRF tests) 6. Code and Drafts recommendations. (Please see attached pic. The MP of Masonry Materials advice in OPCM)

7. The microtremor and vibrate the structures and measure the waves in the structure to assess the fundamental period of the structure.

Regards,

Majid Pouraminian

https://www.linkedin.com/in/majid-pouraminian-a2235278/

https://www.instagram.com/majid.pouraminian/

I recommend these two books for your consideration:

1) SEI/ASCE 11-99: Guideline for Structural Condition Assessment of Existing Buildings

2) Appraisal of existing structures by the Institution of Structural Engineers (IStructE).

I hope these two Guidelines will be helpful to you. Regards

Sampson Agudze thnks

I can send you my article, if you send me your e-mail address. My e-mail is [email protected]

Dear Hatem,

There are several experimental techniques with which you can determine the mechanical properties of unreinforced masonry subjected to different types of actions (i.e., compression, shear, flexure etc.). But if you want to know the range of these values for different types of masonry, then you need to refer to several codes/guidelines/standards like:

1) FEMA 274, P-774, 356, 308, P-751

2) ASCE 41-06

3) ASCE 41-13

4) MSJC 2011

5) AS 3700

6) IS 1905

7) IBC 2009

8) TMS 0403-13

9) EN 1996

I hope this information will be helpful to you.

Regards,

Pravin Kumar