Experimental evaluation of damage effect on dynamic characteristics of concrete encased composite column-beam connections

Hüsem, Metin; Nasery, Mohammad Manzoor; Okur, Fatih Yesevi; Altunışık, Ahmet Can

doi:10.1016/j.engfailanal.2018.04.030

Cited by 17 publications

(12 citation statements)

References 19 publications

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“…The study uses finite elements modeling techniques, and thus it is considerably important to compare the results obtained from the constructed numerical model and those obtained from the experimental study. The validation process should be made to achieve more reliable results and it is widely applied in numerical studies that made in the literature [39][40][41].…”

Section: Validation Of the Modelsmentioning

confidence: 99%

Compactness Effect on Bending Behavior of Cold Formed Steel Beams

Yaman

Ağcakoca

2020

Period. Polytech. Civil Eng.

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With respect to the determination of the strength of the structural steel members, first the behavior of cross section and then that of the overall member should be considered. In this study, it is aimed to determine the compactness behavior of U-shaped steel sections that exposed to minor-axis bending. Thus, the study questions whether the U-shaped cross section exhibits sufficient dimensions for the collapse mechanism to occur by aiding the moment redistribution in the structural system by supplying sufficient hinge rotation capacity. In order to investigate compactness behavior, three different channel section steel profiles are selected. Four point experimental tests are carried out to validate finite element models of the selected profiles. Upon validated finite element models, parametric studies are performed with finite element analyses. In the parametric study two steel classes, different beam lengths and cross-sectional geometries are taken as parameters. At the end of the study the plate slenderness condition required for plastic design calculated based on Eurocode3 is evaluated with the results of parametric study.

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Section: Validation Of the Modelsmentioning

confidence: 99%

Compactness Effect on Bending Behavior of Cold Formed Steel Beams

Yaman

Ağcakoca

2020

Period. Polytech. Civil Eng.

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“…Modal parameters for undamaged situation are briefed in Table 5. Concrete cover cracks in the first stages of quasi-static cyclic loading test (Hu¨sem et. al., 2018).…”

Section: Cecc-f: One-side Steel Through-beam Haunched Connectionmentioning

confidence: 99%

“…To increase the rigidity of moment-resisting connections, beams can be strengthened by haunches (Lawson and Rackham, 1989). There are many specific applications about the usage of haunches in steel structures (Dinu et al, 2017;Lachal et al, 2005;Saberi et al, 2016;Tanaka, 2003), concrete structures (Akbar et al, 2018;Archundia-Aranda et al, 2013;El-Niema, 1988;Galal and Yang, 2009;Sasmal and Voggu, 2018;Tena-Colunga et al, 2017;Yuksel and Yarar, 2015), and composite structures (Bridge et al, 2006;Hu¨sem et al, 2018;Shanmugam et al, 2002) to increase the structural performance of rigid connection zones. As argued by Ng et al (2012), haunches are generally made from a taper T-section of main beam or stiffness plates in steel and composite members.…”

Section: Introductionmentioning

confidence: 99%

“…The authors published a paper (Hu¨sem et al, 2018) about the evaluation of damage effect on dynamic characteristics of CECC-beam connections, in which four different types of composite column-beam connections, only one of which was haunched connection, have been investigated. The results showed that haunch has directly affected the joint rigidity of connection zone and changed its dynamic characteristic.…”

Section: Introductionmentioning

confidence: 99%

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Damage effect on experimental modal parameters of haunch strengthened concrete-encased composite column–beam connections

Nasery

Hüsem

Okur

et al. 2019

International Journal of Damage Mechanics

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This paper presents an experimental study about the effects of damage on modal parameters of haunch strengthened composite column–steel beam connections. Five specimens having various composite column and steel beam connection details were constructed in order to be examined in laboratory condition. Non-destructive experimental measurements were conducted to extract the modal parameters using frequency and time domain methods before and after damage conditions. Quasi-static cyclic tests were performed to assess the damaged conditions in connection zones of the test specimens. At the end of the study, it is observed distinctly that there is a decreasing trend in natural frequencies with damages. Also, no compliance is observed between mode shapes pre- and post-cycling loading tests. The biggest dissimilarities concerning natural frequencies were determined among 26.57% and 36.54%. The value for modal assurance criterion was 1.0 for undamaged condition. However, in post-damaged situation, the mode shapes have changed and modal assurance criterion values nearly approached zero. Finally, experimentally obtained damping ratios have been analyzed. The outcome of the study has shown some dissimilarity and that the values are not being correlated constructively. Despite the fact that the results are consistent with the available literature, it is assumed that these dissimilarities point to the fact that higher levels of excitation might be need to precisely record the damping ratios.

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“…A vast amount of literature can be found regarding the finite element model updating of steel structures, 13–20 reinforced concrete structures, 21–27 base isolated structures, 28 timber structures, 29,30 and masonry structures 31–36 . However, there are very limited studies about the ambient vibration test‐based system identification and FEM updating of concrete steel composite structures 37–39 …”

Section: Introductionmentioning

confidence: 99%

Model updating‐based automated damage detection of concrete‐encased composite column‐beam connections

Nasery

Hüsem

Okur

et al. 2020

Struct Control Health Monit

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Summary This paper presents a comparative study about the numerical and experimental system identification and model updating‐based automated damage detection of concrete‐encased composite column‐beam connections. Four different column‐beam connection types named as CBC#A, CBC#B, CBC#C, and CBC#D were considered without any changes in geometrical configuration. Numerical and experimental dynamic characteristics were extracted by initial finite element analysis and nondestructive experimental measurements for undamaged condition. Enhanced frequency domain decomposition (EFDD) method was used for experimental modal extractions. A good agreement was observed between experimental natural frequencies but not enough correlation between damping ratios for all connection types. Maximum differences between initial finite element and undamaged experimental results were calculated as 34.68% for CBC#A, 40.78% for CBC#B, 33.15% for CBC#C, and 47.13% for CBC#D type connection details. The differences were reduced to 0.24%, 0.24%, 0.16%, and 0.15%, respectively, by automated model updating procedure using spring coefficient, modulus of elasticity and weight per unit volume. In the case of the damaged condition, lateral forces were applied to simulate the effect of an earthquake. Cracks strongly affected the natural frequencies. The mode shapes were not broken evidently after damaged conditions. The mode shapes definitely deviated a bit, but generally the same after damages. The natural frequencies have decreased non‐monotonically due to the decrease in the rigidity of the column and beam at the cracked section. Maximum differences were calculated as 14.96% for CBC#A, 41.08% for CBC#B, 31.35% for CBC#C, and 45.93% for CBC#D type connection details. After automated model updating the above‐mentioned differences were reduced to 0.35%, 0.78%, 0.73%, and 0.85% respectively. Contour diagrams of changes of updating parameters were plotted for damage identification. The regions with high difference rates indicated the location of the damage.

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Experimental evaluation of damage effect on dynamic characteristics of concrete encased composite column-beam connections

Cited by 17 publications

References 19 publications

Compactness Effect on Bending Behavior of Cold Formed Steel Beams

Compactness Effect on Bending Behavior of Cold Formed Steel Beams

Damage effect on experimental modal parameters of haunch strengthened concrete-encased composite column–beam connections

Model updating‐based automated damage detection of concrete‐encased composite column‐beam connections

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