Experimental and analytical investigation into crack strength determination of infilled steel frames

Moghadam, Hamid; Mohammadi, Mitra; Ghaemian, Mohsen

doi:10.1016/j.jcsr.2006.01.002

“…Material properties of the experimental test are tabulated in Table 3. [12] load in the two curves are close to each other which verify that explicit finite element method is precisely capable of simulate the behavior of masonry walls. Crack pattern in the finite element model is diagonal which is similar to those observed in experimental test carried out by Moghaddam et al [12] .…”

Section: Detailssupporting

confidence: 67%

“…The latter studies present more realistic results and applied forces and cracking pattern are closer to the real behavior of structural frames. For example, experimental tests have been carried out by Moghaddam et al [12] on steel frames infilled by masonry and concrete walls [12] . In this study, the results of this experimental test are used to verify the finite element models.…”

Section: Critical Time Incrementmentioning

confidence: 99%

A Study of the Effect of Infilled Brick Walls on Behavior of Eccentrically Braced Frames Using Explicit Finite Elements Method

Daryan¹

2009

American J. of Engineering and Applied Sciences

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Problem statement: Eccentrically Braced Frames (EBFs) are usually infilled by masonry walls, but in common design, the stiffness and lateral resistance of these walls is ignored. Considering the results of carried out tests and studies, it seems that infilled masonry walls have a significant influence on the stiffness and the strength of EBFs. Since experimental test of total frame with infilled brick wall is a very expensive and time consuming process, proper numerical models which can precisely simulate the behavior of EBFs considering the effects of infilled brick wall are necessary. Approach: In this study, a proper model is made using explicit finite elements method to study the behavior of EBFs with infilled masonry wall. Because of complicated mechanical and geometrical properties of masonry walls and also because of the interaction between steel frame and masonry wall, this model is not easy to obtain. To ensure the ability of the model to precisely simulate the behavior of an EBF with infilled brick wall, initial models were made and the problems were solved comparing the results of experimental test and the results of these initial models. Firstly, material models and some basic principles of explicit finite element algorithm are used and three initial models were made: a model of a brick wall without eccentrically braced steel frame, a model of an EBF without infilled brick wall and finally a model of an EBF with infilled brick wall. Results: Using these three initial models, constitutive model for masonry and steel material and also the proper elements for modeling the behavior of mortar is obtained. Studies showed that good prediction of the behavior of a system consisting of EBF and masonry wall is possible, by minimizing the kinematical energy and using a special time scaling of explicit finite element model. Conclusion: After verifying the finite element models, the influence of masonry infilled wall on the behavior of eccentrically braced frames is studied. This investigation showed that in general, the presence of masonry wall increases the yield strength and the elastic range in the force-displacement curves. But the plastic behavior of the frame is deteriorated and due to fragile behavior of masonry materials, the total system of steel frame and masonry wall has a significant strength fall when the elastic range is passed.

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“…of the selected experimental test: Moghaddam et al [12] tested 11 steel frame specimens infilled by masonry and concrete walls under cyclic loading. One of these specimens which is a steel frame with masonry wall is selected to verify finite element models.…”

Section: Detailsmentioning

confidence: 99%

A Study of the Effect of Infilled Brick Walls on Behavior of Eccentrically Braced Frames Using Explicit Finite Elements Method

M.,¹

2009

American Journal of Engineering and Applied Sciences

3

0

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Problem statement: Eccentrically Braced Frames (EBFs) are usually infilled by masonry walls, but in common design, the stiffness and lateral resistance of these walls is ignored. Considering the results of carried out tests and studies, it seems that infilled masonry walls have a significant influence on the stiffness and the strength of EBFs. Since experimental test of total frame with infilled brick wall is a very expensive and time consuming process, proper numerical models which can precisely simulate the behavior of EBFs considering the effects of infilled brick wall are necessary. Approach: In this study, a proper model is made using explicit finite elements method to study the behavior of EBFs with infilled masonry wall. Because of complicated mechanical and geometrical properties of masonry walls and also because of the interaction between steel frame and masonry wall, this model is not easy to obtain. To ensure the ability of the model to precisely simulate the behavior of an EBF with infilled brick wall, initial models were made and the problems were solved comparing the results of experimental test and the results of these initial models. Firstly, material models and some basic principles of explicit finite element algorithm are used and three initial models were made: a model of a brick wall without eccentrically braced steel frame, a model of an EBF without infilled brick wall and finally a model of an EBF with infilled brick wall. Results: Using these three initial models, constitutive model for masonry and steel material and also the proper elements for modeling the behavior of mortar is obtained. Studies showed that good prediction of the behavior of a system consisting of EBF and masonry wall is possible, by minimizing the kinematical energy and using a special time scaling of explicit finite element model. Conclusion: After verifying the finite element models, the influence of masonry infilled wall on the behavior of eccentrically braced frames is studied. This investigation showed that in general, the presence of masonry wall increases the yield strength and the elastic range in the force-displacement curves. But the plastic behavior of the frame is deteriorated and due to fragile behavior of masonry materials, the total system of steel frame and masonry wall has a significant strength fall when the elastic range is passed.

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“…Moghadam [9] conducted an intensive research on the seismic behavior of infilled frames and the research results included many aspects, such as the crack strength determination of infilled steel frames (Moghadam et al [10]), the impact of repair and retrofit on in-plane behavior of masonry infilled steel frames (Moghadam [11]), seismic strengthening of masonry infilled structures (Moghadam and Mahmoodi [12]), mathematical functions to evaluate stress of infilled frames (Mahmoodi and Moghadam [13]), discrete element method in the nonlinear analysis of masonry-infilled steel frames with opening (Mohammadi et al [14]). …”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Sandwich Composite Panel Infilled Steel Frames

Hou¹,

Qiu²,

Wang³

et al. 2012

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Cyclic loading tests on eight full-scale one storey, one-bay test specimens were carried out to study the hysteretic behavior of steel frames infilled with sandwich composite panels. Six main influential parameters, including panel thickness, panel type, panel position, column orientation, beam-to-column connection type and connecting method of panel to steel frame are considered. Based on the experimental phenomena, seismic behaviors of specimens were reflected by hysterics loops, skeleton curves, curves of strength degradation, curves of stiffness degradation, ductility coefficient and equivalent damping coefficient. Test results show that the failure modes of panels and steel frames are concrete spalling around the embedded parts, weld fracture, and local buckling of beam, respectively. The integrity of the panel is better than the traditional walls. The success of connection between panel and steel frame is significant to the mutual work of the two parts. Both of increasing the panel thickness and strengthening the connection can improve the seismic behavior of structure. At the end of the paper, seismic design recommendations based on the analysis of ductility index and energy dissipation of the structures are presented.

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Experimental and analytical investigation into crack strength determination of infilled steel frames

Cited by 40 publications

References 3 publications

A Study of the Effect of Infilled Brick Walls on Behavior of Eccentrically Braced Frames Using Explicit Finite Elements Method

A Study of the Effect of Infilled Brick Walls on Behavior of Eccentrically Braced Frames Using Explicit Finite Elements Method

A Study of the Effect of Infilled Brick Walls on Behavior of Eccentrically Braced Frames Using Explicit Finite Elements Method

An Experimental Study on Sandwich Composite Panel Infilled Steel Frames

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