Structural performance of composite double beam system

Lee, Jae-Man; Kim, Minjun; Lee, Yong-Jun; Kim, Sang Woo; Lee, Jung-Yoon; Kim, Kil-Hee

doi:10.1177/1369433215624599

Cited by 6 publications

(7 citation statements)

References 9 publications

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“…Some scholars have used UHPC to replace the normal concrete structure in steelconcrete composite beams to study the crack resistance, bending performance, and ultimate bearing capacity. 9,10 The results show that the crack resistance and bearing capacity of the UHPC wet joint without the posttensioning tendon and the welding in the negative bending moment zone can meet the engineering requirements. Shao Xudong et al put forward a new UHPC joint in the negative moment zone of steel-concrete composite beams, which is suitable for simple support before continuous structure.…”

Section: Introductionmentioning

confidence: 98%

“…However, this study does not give the recommended values of UHPC layer structure parameters, which limits its engineering application. Some scholars have used UHPC to replace the normal concrete structure in steel‐concrete composite beams to study the crack resistance, bending performance, and ultimate bearing capacity 9,10 . The results show that the crack resistance and bearing capacity of the UHPC wet joint without the posttensioning tendon and the welding in the negative bending moment zone can meet the engineering requirements.…”

Section: Introductionmentioning

confidence: 99%

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Bearing capacity of UHPC‐NC connection structure in negative moment zone of PC beam bridges

Li,

2023

Structural Concrete

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A new type of UHPC‐NC (normal concrete) structure in the negative moment zone was proposed to improve the bearing capacity of the connection structure in the negative moment zone of prefabricated prestressed concrete (PC) beam bridges. First, the distribution characteristics of the crack, cracking load, ultimate moment, and ductility coefficient of the new structure were obtained by the 1:4 scale model tests. The feasibility of the connection structure is verified. Then, the value ranges of critical structural parameters affecting the bearing capacity of the connection structure based on the plane section assumption analysis, including the reasonable thickness of the UHPC layer, the reinforcement ratio of the longitudinal tensile reinforcement, and the diameter of the reinforcement, are obtained. At the same time, based on the verification of the finite element model, the influence of crucial research parameters on the bending capacity of the connection structure is obtained by using the finite element method. Finally, a theoretical method for the bending moment capacity of the connection structure of the UHPC‐NC structure is proposed, considering the high ductility characteristics of UHPC materials. The average relative error between the calculation results and the finite element method is within 7.2%, which verifies the reliability of the calculation method in this paper and provides a reference for its design and engineering application.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Bearing capacity of UHPC‐NC connection structure in negative moment zone of PC beam bridges

Li,

2023

Structural Concrete

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“…The steel-concrete composite floor system is more advantageous than steel floor systems for reducing material quantities and GHGs related to embodied CO 2 emissions because it can increase the stiffness and strength of the section owing to the composite effect of steel and concrete [12]. Kinderis et al [13] reported that the composite floor system, the so-called Deltabeam, can reduce the building's height compared to concrete beams.…”

Section: Introductionmentioning

confidence: 99%

Non-Iterative Optimal Design Method Based on LM Index for Steel Double-Beam Floor Systems Reinforced with Concrete Panels

Choi

Kim

2022

Materials

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Steel double-beam floor systems reinforced with concrete panels can improve the structural and environmental performance of buildings by reducing moment demands and embodied CO2 emissions. However, for steel double-beam floor systems, a time-consuming iterative analysis is required to derive an optimal design proposal owing to the rotational constraints in the composite joints between the concrete panel and steel beams. In this study, a non-iterative optimal design method using the LM index is proposed to minimize the embodied CO2 emissions of steel double-beam floor systems. The LM index is a measure that can be used to select the optimal cross-section of the steel beams considering the decreased moment capacity according to the unbraced length. The structural feasibility of the proposed design method was verified by investigating whether safety-related constraints were satisfied by the LM index with respect to the design variables under various gravity loads. The applicability of the proposed optimal design method is verified by comparing the embodied CO2 emissions derived from the proposed and code-based design methods. Applicable design conditions were presented based on the LM index to aid engineers. The proposed design method can provide environmentally-optimized design proposals to ensure structural safety by directly selecting the LM index of steel beams.

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“…The results of previous studies on the beam-column connections of the steel-concrete high load. The results of previous studies on the beam-column connections of the steelconcrete composite floor systems showed that the connection reinforcement induced a negative moment at the ends of the composite beam, thereby decreasing the moment demand [14][15][16][17][18]. However, these composite floor systems have low constructability due to the complicated details for securing sufficient rotational constraints of the beam-column connections.…”

Section: Introductionmentioning

confidence: 99%

Development of Optimal Design Method for Steel Double-Beam Floor System Considering Rotational Constraints

Choi

Kim

2021

Applied Sciences

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Under high gravity loads, steel double-beam floor systems need to be reinforced by beam-end concrete panels to reduce the material quantity since rotational constraints from the concrete panel can decrease the moment demand by inducing a negative moment at the ends of the beams. However, the optimal design process for the material quantity of steel beams requires a time-consuming iterative analysis for the entire floor system while especially keeping in consideration the rotational constraints in composite connections between the concrete panel and steel beams. This study aimed to develop an optimal design method with the LM (Length-Moment) index for the steel double-beam floor system to minimize material quantity without the iterative design process. The LM index is an indicator that can select a minimum cross-section of the steel beams in consideration of the flexural strength by lateral-torsional buckling. To verify the proposed design method, the material quantities between the proposed and code-based design methods were compared at various gravity loads. The proposed design method successfully optimized the material quantity of the steel double-beam floor systems without the iterative analysis by simply choosing the LM index of the steel beams that can minimize objective function while satisfying the safety-related constraint conditions. In particular, under the high gravity loads, the proposed design method was superb at providing a quantity-optimized design option. Thus, the proposed optimal design method can be an alternative for designing the steel double-beam floor system.

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Structural performance of composite double beam system

Cited by 6 publications

References 9 publications

Bearing capacity of UHPC‐NC connection structure in negative moment zone of PC beam bridges

Bearing capacity of UHPC‐NC connection structure in negative moment zone of PC beam bridges

Non-Iterative Optimal Design Method Based on LM Index for Steel Double-Beam Floor Systems Reinforced with Concrete Panels

Development of Optimal Design Method for Steel Double-Beam Floor System Considering Rotational Constraints

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