Dear researcher,
I'm applying a thermal strain to generate the prestressed force in the steel strand of my concrete wall model using predefined temperature in Abaqus as shown in Figure 1. In this regard, I have input the expansion coefficient on the steel strand material as shown in the attached figure 2. Unfortunately, the stress was generated up to the yield stress of the steel strand (which is 1580 N/mm2) and maintained the yield stress value while my model keeps displaced (refer to figure 3). The stress supposedly keeps increasing beyond the yield value as the wall keeps displace since I have input the plastic material for the steel strand as shown in the attached figure 2. Yet, this didn't happen. I'm suspected that the thermal coefficient used is working only under elastic range where beyond the yield point of material data, the thermal coefficient no longer works.
Can anyone figure out the problem? Thanks in advance!!!
Dear Mr. Ashaari Masrom
Is it possible to create pretension force using line load on cables?
Ali Shoari..as I acknowledged,there are a few approaches to generate the pretension force in cable:
1.using predefined stress
2.using predefined temperature with coefficient of expansion.
3.using applied displacement/velocity on end tendon.
You need to try and error which approach will give the stable result on your curve line output.For my case study, it is inappropriate to use predefined stress since it will produced unstable result. Thus, I have using predefined temp. which give a stable output curve line. Regarding your approach to use line load,I guess it is inappropriate to use that.Yet, you can try that approach and see the result wether it fit against expectation/analytical.
Thanks for your complete answer.
I'm at first step of my model and for complementary analysis maybe I'll model pre-stressed concrete. As an idea i was figure out if I divide cable in 2 parts and apply a line load toward the center of cable it could be a simulation of pretension force. I will inform you when I get results.
** PREDEFINED FIELDS
**
** Name: Field-1 Type: Temperature
*Initial Conditions, type=TEMPERATURE
PART-1.NSET-ALL-PART-1, 20.
** ----------------------------------------------------------------
**
** STEP: step-temp
**
*Step, name=step-temp, nlgeom=YES
*Static
0.5, 1., 1e-05, 1.
**
** PREDEFINED FIELDS
**
** Name: Field-1 Type: Temperature
*Temperature, op=NEW
PART-1.NSET-ALL-PART-1, -420.
**
Here, is the reference of my Master thesis.
www.researchgate.net/publication/344477958_NONLINEAR_ANALYSIS_OF_REINFORCED_CONCRETE_BASED_ON_ABAQUS_AND_OPENSEES
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