FRC-Steel Joist Composite Frames for Seismic Resistance

The research reported in this paper is concerned with development of fiber-reinforced concrete-encased open web steel joist composite frames for seismic resistance. This new and innovative system completely eliminates the need for any shear connectors between steel joists and surrounding concrete as well as that for conventional longitudinal and transverse reinforcement, all of which are quite labor intensive. In the initial phase of the study tests were carried out on half-scale beam specimens subjected to monotonic and reversed cyclic loading. The results showed that the presence of steel fibers as well as the open web steel significantly enhances the shear capacity of the system thus making it very suitable for seismic resistance. In the final phase, a half-scale, one-story, one-bay frame was designed by strong column-weak beam concept. The results showed ductile and stable hysteretic behavior. The study indicates that this type of composite framing system has excellent potential in seismic regions.

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Experimental Study of Seismic Performance on Three-Story Prestressed Fabricated Concrete Frame

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.1287 ◽

2011 ◽

Vol 250-253 ◽

pp. 1287-1292

Author(s):

Man Rong Song ◽

Bing Kang Liu ◽

Shen Jiang Huang ◽

An Zhou

Keyword(s):

Carrying Capacity ◽

Plastic Hinge ◽

Joint Stiffness ◽

Hysteretic Behavior ◽

Hysteresis Curve ◽

Beam Structure ◽

Concrete Frame ◽

Weak Beam ◽

Reversed Cyclic ◽

Deformation Recovery

Based on the low reversed cyclic loading experiment of a specimen of three-story prestressed fabricated concrete frame, this paper investigates the carrying capacity, the failure mode, the load-displacement hysteresis curve of frame. The research includes the seismic performances such as failure mechanism, rigidity degradation, hysteretic behavior and etc. The results indicate that the plastic hinge first appears at the ends of beam at lower story. The connections of frame are in a state of bi-direction compression and have more joint stiffness, which therefore enhances the frame lateral stiffness and improves the deformation recovery capability. The carrying capacity of the frame hasn’t serious degradation at story drifts between 1/39 and 1/64. The post-tensioned prestressed fabricated concrete frame is a “strong column weak beam” structure.

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Analysis on hysteretic behavior of composite frames with concrete-encased CFST columns

Journal of Constructional Steel Research ◽

10.1016/j.jcsr.2017.03.011 ◽

2017 ◽

Vol 135 ◽

pp. 176-186 ◽

Cited By ~ 6

Author(s):

Kun Wang ◽

Xiao-Feng Lu ◽

Shen-Feng Yuan ◽

Da-Fu Cao ◽

Zai-Xian Chen

Keyword(s):

Hysteretic Behavior ◽

Composite Frames ◽

Cfst Columns

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Shear strength of reinforced concrete beams with a fiber concrete matrix

Canadian Journal of Civil Engineering ◽

10.1139/l05-118 ◽

2006 ◽

Vol 33 (6) ◽

pp. 726-734 ◽

Cited By ~ 32

Author(s):

Fariborz Majdzadeh ◽

Sayed Mohamad Soleimani ◽

Nemkumar Banthia

Keyword(s):

Shear Strength ◽

Reinforced Concrete ◽

Fiber Volume Fraction ◽

Volume Fraction ◽

Fiber Reinforcement ◽

Shear Capacity ◽

Fiber Reinforced Concrete ◽

Rc Beams ◽

Fiber Reinforced ◽

Fiber Volume

The purpose of this study was to investigate the influence of fiber reinforcement on the shear capacity of reinforced concrete (RC) beams. Both steel and synthetic fibers at variable volume fractions were investigated. Two series of tests were performed: structural tests, where RC beams were tested to failure under an applied four-point load; and materials tests, where companion fiber-reinforced concrete (FRC) prisms were tested under direct shear to obtain material properties such as shear strength and shear toughness. FRC test results indicated an almost linear increase in the shear strength of concrete with an increase in the fiber volume fraction. Fiber reinforcement enhanced the shear load capacity and shear deformation capacity of RC beams, but 1% fiber volume fraction was seen as optimal; no benefits were noted when the fiber volume fraction was increased beyond 1%. Finally, an equation is proposed to predict the shear capacity of RC beams.Key words: shear strength, fiber-reinforced concrete, RC beam, stirrups, energy absorption capacity, steel fiber, synthetic fiber.

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Performances of moment resisting frames with slender composite sections in low-to-moderate seismic areas

Proceedings 12th international conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018 ◽

10.4995/asccs2018.2018.7150 ◽

2018 ◽

Cited By ~ 1

Author(s):

Hervé Degée ◽

Yves Duchêne ◽

Benno Hoffmeister

Keyword(s):

Numerical Model ◽

Global Analysis ◽

Local Buckling ◽

Experimental Tests ◽

Hysteretic Behavior ◽

Moderate Intensity ◽

Moment Resisting Frames ◽

Composite Frames ◽

Moderate Seismicity ◽

Moment Resisting

The aim of the recently completed European research program Meakado is therefore to study design options with requirements proportioned to the actual seismic context of constructions in areas characterized by a low or moderate seismic hazard, contrary to most researches aiming at maximizing the seismic performances. In this general framework, specific investigations have been carried out regarding typical beam profiles commonly used for multi-bay - multi-storey composite frames. In a first stage, experimental tests on class-3 composite beam-to-column connections were performed. The measurement results were evaluated with regard to the development of the hysteretic behavior with particular emphasis on the degradation. These test results have been used as reference for the calibration and validation of numerical model aiming at extending the scope of the experimental outcomes through appropriate parametric variations regarding the behavior of nodal connections as well as towards the global analysis and behavior of structures made of class 3 and 4 profiles. Numerical investigations of the global performance of composite frames with slender cross-sections are then performed resorting to the numerical model previously calibrated with respect to the experimental tests and additional simulations at node level. Results are compared to the performance of an equivalent frame made of compact steel profiles. Attention is paid to the effects of strength and stiffness degradation due to local buckling. The analysis of the results is specifically focusing on the comparison of the rotation capacity of the slender section with the actual rotation demand imposed by a moderate intensity earthquake. Based on the outcomes of these investigations, practical design recommendations are finally derived for multi-storey, multi-bay moment resisting frames with type b (full composite action) beam-to column connections located in low and moderate seismicity regions.

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Ultimate shear strength of perfobond shear connectors subjected to fully reversed cyclic loading

Engineering Structures ◽

10.1016/j.engstruct.2021.113240 ◽

2021 ◽

Vol 248 ◽

pp. 113240

Author(s):

Atsushi Suzuki ◽

Kaho Suzuki ◽

Yoshihiro Kimura

Keyword(s):

Shear Strength ◽

Cyclic Loading ◽

Ultimate Shear Strength ◽

Reversed Cyclic Loading ◽

Shear Connectors ◽

Reversed Cyclic

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An analytical approach to predict shear capacity of steel fiber reinforced concrete coupling beams with small span-depth ratio

Engineering Structures ◽

10.1016/j.engstruct.2018.05.072 ◽

2018 ◽

Vol 171 ◽

pp. 348-361 ◽

Cited By ~ 4

Author(s):

Jun Zhao ◽

Kou Li ◽

Fuqiang Shen ◽

Xiangcheng Zhang ◽

Chenzhe Si

Keyword(s):

Reinforced Concrete ◽

Analytical Approach ◽

Steel Fiber ◽

Shear Capacity ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Steel Fiber Reinforced Concrete ◽

Coupling Beams ◽

Depth Ratio

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A Novel Feature Selection Approach Based on Tree Models for Evaluating the Punching Shear Capacity of Steel Fiber-Reinforced Concrete Flat Slabs

Materials ◽

10.3390/ma13173902 ◽

2020 ◽

Vol 13 (17) ◽

pp. 3902 ◽

Cited By ~ 2

Author(s):

Shasha Lu ◽

Mohammadreza Koopialipoor ◽

Panagiotis G. Asteris ◽

Maziyar Bahri ◽

Danial Jahed Armaghani

Keyword(s):

Feature Selection ◽

Reinforced Concrete ◽

Predictive Models ◽

Steel Fiber ◽

Shear Capacity ◽

Fiber Reinforced Concrete ◽

Punching Shear ◽

Fiber Reinforced ◽

Steel Fiber Reinforced Concrete ◽

Flat Slabs

When designing flat slabs made of steel fiber-reinforced concrete (SFRC), it is very important to predict their punching shear capacity accurately. The use of machine learning seems to be a great way to improve the accuracy of empirical equations currently used in this field. Accordingly, this study utilized tree predictive models (i.e., random forest (RF), random tree (RT), and classification and regression trees (CART)) as well as a novel feature selection (FS) technique to introduce a new model capable of estimating the punching shear capacity of the SFRC flat slabs. Furthermore, to automatically create the structure of the predictive models, the current study employed a sequential algorithm of the FS model. In order to perform the training stage for the proposed models, a dataset consisting of 140 samples with six influential components (i.e., the depth of the slab, the effective depth of the slab, the length of the column, the compressive strength of the concrete, the reinforcement ratio, and the fiber volume) were collected from the relevant literature. Afterward, the sequential FS models were trained and verified using the above-mentioned database. To evaluate the accuracy of the proposed models for both testing and training datasets, various statistical indices, including the coefficient of determination (R2) and root mean square error (RMSE), were utilized. The results obtained from the experiments indicated that the FS-RT model outperformed FS-RF and FS-CART models in terms of prediction accuracy. The range of R2 and RMSE values were obtained as 0.9476–0.9831 and 14.4965–24.9310, respectively; in this regard, the FS-RT hybrid technique demonstrated the best performance. It was concluded that the three hybrid techniques proposed in this paper, i.e., FS-RT, FS-RF, and FS-CART, could be applied to predicting SFRC flat slabs.

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Shear behavior of large stud shear connectors embedded in ultra-high-performance concrete

Advances in Structural Engineering ◽

10.1177/1369433220939208 ◽

2020 ◽

Vol 23 (16) ◽

pp. 3401-3414

Author(s):

Yuqing Hu ◽

Huiguang Yin ◽

Xiaomeng Ding ◽

Shuai Li ◽

JQ Wang

Keyword(s):

Numerical Analysis ◽

High Performance ◽

High Performance Concrete ◽

Concrete Slab ◽

Shear Behavior ◽

Shear Capacity ◽

Ultra High Performance Concrete ◽

Shear Connectors ◽

Push Out ◽

Static Shear

In this article, the static shear behavior of large-headed studs embedded in ultra-high-performance concrete was investigated by push-out test and numerical analysis. A total of nine push-out specimens with single and grouped studs embedded in ultra-high-performance concrete and normal strength concrete slabs were tested. In the testing process, only shank failure appeared without cracks occurring on the surface of ultra-high-performance concrete slab when the steel–ultra-high-performance concrete specimens reached ultimate shear capacity. The shear capacity of specimens with large studs embedded in ultra-high-performance concrete slab increased by 10.6% compared those in normal concrete, and the current design codes such as Eurocode4, AASHTO LFRD 2014, and GB50017-2003 all underestimate the shear capacity of such kind of steel–ultra-high-performance concrete composite structures according to experimental results. Numerical models were established using ABAQUS with introducing damage plasticity material model. The influence of stud diameter, concrete strength, thickness of clear cover, and spacing of studs on the static shear behavior was thoroughly investigated via parametric analysis. Based on the experimental and numerical analysis, the existence of wedge block and the decrease of axis force are beneficial for improving the shear capacity of stud shear connectors.

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Evaluation of Load Carrying Capacity of the Perforated Shear Connector with Flange Heads

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.326-328.1811 ◽

2006 ◽

Vol 326-328 ◽

pp. 1811-1816 ◽

Cited By ~ 1

Author(s):

Young Ho Kim ◽

Jae Ho Jung ◽

Soon Jong Yoon ◽

Won Sup Jang

Keyword(s):

Carrying Capacity ◽

Load Transfer ◽

Shear Capacity ◽

Load Carrying Capacity ◽

Shear Connector ◽

Shear Connectors ◽

Load Carrying ◽

Bridge Structures ◽

Composite Bridge ◽

New Type

In the construction of composite bridge structures, various types of shear connectors are usually used to provide an efficient load transfer and the composite action of two or more different materials. In the previous work conducted by authors, a new type of the shear connector was introduced, which is the perforated shear connector with flange heads (T-shaped perforated shear connector), and the structural behavior of the shear connector was discussed based on the results of push-out tests. For the practical design of new shear connector, it is necessary to develop the equation for the prediction of the load carrying capacity of the shear connector. In this study, the existing design equations for the Perfobond shear connector were briefly analyzed and the equation for the prediction of the shear capacity of T-shaped perforated shear connector was suggested empirically. By comparing the results obtained by the suggested equation, the existing equations for the Perfobond shear connector, and the experiment, the applicability and effectiveness of the suggested equation was estimated.

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