Low-Cycled Hysteresis Characteristics of Circular Hollow Steel Damper Subjected to Inelastic Behavior
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This study aims to evaluate hysteresis response behavior of circular hollow steel damper (CHSD). Steel dampers are a type of passive dampers and commonly used for seismic dissipation in civil engineering structures. Steel dampers are widely used for seismic energy dissipation because they are easy to install, maintain and they are also inexpensive. CHSD is among steel dampers which dissipates seismic energy through metallic deformation and geometrical elasticity of circular shape and fatigue resistance around welded connection to the end plates. Finite element analysis was conducted in order to evaluate the hysteresis characteristics and low cycle fatigue behavior of CHSD using failure index. To verify the analysis simulation quasi static loading was conducted and the result was compared and satisfactory result was obtained.
KeywordsHysteresis characteristics Circular hollow steel damper Aspect ratio Quasi-static loading Large deformation FE analysis
2 Non-linear Finite Element Analysis
3 Constraint and Loading Condition
The boundary conditions are controlled at the reference points created at the center both end plates. All the translational and rotational displacement components are fixed at the reference points of the lower end plate. A cyclic load was given at upper end plate reference points in X-direction fixing all the translation and rotation in other direction. The boundary condition and method of loading adopted in the finite element analysis followed to have the specimen shear effect and the same as those used in the tests for verification. A constant strain loading is implemented in which the load is applied by controlling the displacement with the displacement protocol shown in Fig. 8.
4 Verification of Finite Element Analysis
4.1 Test Set-Up and Process
4.2 Comparison of Results
4.3 Low Cycle Fatigue Failure
4.4 Effect of Diameter-to-Thickness Ratio
In order to evaluate the effect of diameter-to-thickness ratio on low fatigue failure behavior of circular hollow section damper a using simple approaches called PEEQ Index. The PEEQ Index is given by the ratio of the plastic equivalent strain to the yield strain.
The hysteresis and low fatigue failure behavior of circular hollow section steel damper was evaluated through non-linear finite element and the analysis is of course verified by quasi-static loading test and the following conclusion was drawn.
Depending on the diameter-to-thickness ration (D/t) the hysteresis response as well as the buckling mode of circular hollow section steel damper is different. It is found that, thin CHSD, D/t > 27.8, the hysteresis response forms pinching at initial displacement and severe out-of-plane buckling was also observed. As the thickness increase the hysteresis response became stable. The low cycle fatigue behavior is evaluated using failure index and PEEQ index. The failure index for CHS80 × 48.6 × 3.2 reaches 1 at 9.21th cycle where the cyclic load resisting strength started to degrade for both analysis and test results. The diameter-to-thickness parameter considered the PEEQ index in longitudinal and half the circumference. The minimum PEEQ index is found for D/t ratio between 10 and 20. This section can be taken as the effective section for circular hollow section damper.
This work was financially supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2015-053557) and supported by research fund from Chosun University, 2016.
- ABAQUS ver. 6.10-1. (2011). User manual and documentation. Providence: Dassault Systems.Google Scholar
- Abebe, D. Y., & Choi, J. H. (2012). Structural performance evaluation on circular pipe steel damper. In Proceedings of international union of materials research society—international conference in Asia.Google Scholar
- Abebe, D. Y., Jeong, S. J., Getahune, B. M., Segu, D. Z., & Choi, J. H. (2014). Study on hysteretic characteristics of shear panel damper made of low yield point steel. Materials Research Innovations, 19(S5), S5-902–S5-910.Google Scholar
- Abebe, D. Y., Kim, J. W., & Choi, J. H. (2013). Hysteresis characteristics of circular pipe steel damper using LYP225. In Proceedings of Steel Innovation conference, February, 22–26, Christ Church, New Zealand. Google Scholar
- Hanson, R. D., Xia, C., & Su, Y. F. (1992). Design of supplemental steel damping devices for buildings. In Proceedings of the 10th world congress on earthquake engineering, Balkema, Rotterdam.Google Scholar
- Jeong, S. J., Abebe, D. Y., Gwak, G. Y., & Choi, J. H. (2016). Analytical evaluation of buckling resistance steel damper. In Proceedings of the 7th international conference on computational methods, August 1–4, Berkeley, CA, USA.Google Scholar
- Kanvinde, A. M., & Deierlein, G. (2004). Micromechanical simulation of earthquake induced fracture in steel structures. Tech. Rep. TR145, Blume Center, Stanford University.Google Scholar
- Ricky, W. C., & Faris, A. (2008). Experimental study of steel slit damper for passive energy dissipation. Engineering Structure, 30(4), 1058–1066.Google Scholar
- Tadaki, K., Shigeki, I., Hisaya, K., Takuya, U., & Haruhito, O. (2000). Experimental study on hysteresis damper with low yield strength steel under dynamic loading. In Proceedings of 12th World Congress on Earthquake Engineering, Auckland, New Zealand. Google Scholar
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