Seismosoft | Earthquake Engineering Solutions

Hello,
-First of all I'd like to know if I can define a T section which is wrapped with FRP's. (The FRP's are only on the bottom of the beam).

-Moreover I have a reinforced concrete jacketed rectangular section (rcjrs) in which the section is wrapped up with FRP's. Usually the FRP's are placed on the outer site of the column but here in the outer site I can only put the concrete cover which in my case is within the FRP. Can I do something about this??

What you describe is perfectly possible in SeismoStruct, in more ways than one. Why don't you search this Forum for keywords such "FRP", "wrapping", or similar? It's all been answered already.

Seismosoft Support

Hi,

I was wondering if I use the con_frp for modelling the influence of "FRP STIRRUPS" instead of "FRP sheet Wrapping" considering the volumetric ratio of FRP provided by STIRRUPS and equalize it to the required value for the FRP Jacket Ratio.

Is this "work around" appropriate? Results make sense.

I can't use steel_confined model due to different dilation properties of FRP and steel confined concrete! Much thanks.

Dear Fakharifar Mostafa,

The effect of FRP confinement in the structural model used the analysis can be adequately modelled via only the confinement factors. Hence, you can use even the more stable con_ma with appropriately calculated conf. factors (based on the FRP wrapping).
Note that in the actual structure FRP wrapping also increases the shear stength, however shear is not directly included in the inelastic linear elements of SeismoStruct and similar FE packages, since the relevant issues of interaction between flexure and shear deformations are still under investigation by several researchers worldwide.

SeismoSoft Support

Thank you so much for the great input.

However, I need to point out that for my experimental specimens computing the actual confining pressure provided by the FRP stirrups and implement it by the equivalent steel stirrups in con_ma gave similar results to the case when con_frp where used, with some minor deviations.

Indeed, the fact that you are getting similar results does make sense, since both apporaches end up to a calculated cofinement factor that affects the stress-strain hysteretic curve of concrete.

SeismoSoft Support

Hello
I m an italian student and i want some help about "FRP Wrapping".
I ve a simple RC structure on two stories with 4 columns in each floor. I want to wrap the entire columns with a frp sheets.

Can someone explain me how i can do?

Using "con_frp" wich value of FRP index(ita=indice del rivestimento frp) i have to consider?
Column dimension=300*300(mm)
Frp Sheet thickness=1.5mm

Are there alternatives instead "con_frp"?

tanks for ypur helps

The effect of FRP wrapping in a column is twofold:
1) it provides confinement. This can be calculated based on the FRP properties. In v6.5 the calculation of the confinement factors cannot be done by the program, however in v7, which is to be published in around one month, this will be possible
2) It provides increased shear resistance. Again you should make hand-calculation to estimate the shear capacity increase

SeismoSoft Support

HI
i am simulating Quasi Static Cyclic test on a circular column (total heigh = 1905 mm) of a bridge model which is confined with CFRP layer in bottom half length (height of column on which CFRP is wrapped = 1905/2 mm )... How can i model this CFRP effect on half length of column ???

I want to form hysteresis curve and calculate the energy dissipated ??

The column is subjected to lateral loads in a cyclic fashion ..how this can be simulated in seismosoft as i found the incremental load option but in one direction only ..i want to apply the same load in reverse direction as well ???

The presentation in the following link explains well what i am expecting from software to simulate
https://drive.google.com/file/d/0B7rekW ... sp=sharing

Also i want to mention that i have calculated the Confinement factor due to spirals in a reinforced concrete column which comes out to be 2.45 ..Now i want to apply CFRP layer on half length of the column ..how can i simulate this effect ..
Should a apply two different concrete one on top with a confinement factor of 2.45 (calculated agaisnt spiral confinement) and for bottom portion of the column i apply a confinement factor which is sum of confinement factor for Spirals and CFRP wraps ..

Waiting for kind reply