Effective shear connection for shallow cellular composite floor beams

Abstract

Shallow cellular Composite Floor Beam is a new type of composite floor beam that usually consists of a structural steel beam with regularly spaced web openings and concrete slab casted above the steel decking. In this study, the shear transferring mechanisms of shallow cellular composite beams design with innovative shear connection systems are investigated. A detailed finite element analysis program was performed to investigate the force transferring mechanism, load bearing capacity and failure behavior of the shear connections under direct longitudinal shear forces by simulating the push-out tests. Four different configurations of shear connections (web opening configurations) were designed and an intensive parametric study was conducted to determine the material and geometric parameters that likely influence the behavior of the shear connection. Finally, the findings from this investigation are incorporated with the bending and push-out test results to develop design methods for this form of shear connection. The failure mechanisms of the shear connection were confirmed, and it was also revealed that this type of shear connection is effectively © 2014. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ 2 capable to provide the desired shear resistance and ductile behavior if designed properly.

Sức kháng trượt dọc của chốt bê tông trong dầm liên hợp rỗng chiều cao nhỏ qua thí nghiệm đẩy

“…Huo và D'Mello đã thực hiện hàng loạt các thí nghiệm đẩy với các mẫu thí nghiệm có loại bê tông, đường kính và đặc điểm của chốt bê tông khác nhau qua đó công bố công thức để xác định sức kháng trượt dọc trong dầm có chiều cao nhỏ [7]. Cơ chế làm việc, sức kháng trượt dọc và sự phá hoại của chốt bê tông có hoặc không có gia cường bằng cốt thép cũng đã được nghiên cứu bằng phương pháp mô phỏng số [8,9]. Ở Việt Nam, gần đây đã có nghiên cứu về dầm LHT-BT có chiều cao nhỏ như dầm liên hợp có tiết diện dầm thép hộp rỗng [10], tuy nhiên nghiên cứu mới chỉ xác định sức kháng trượt dọc theo lý thuyết đề cập trong EN 1992-1-1.…”

Behaviour and push-out test of concrete dowel connectors for longitudinal shear in shallow-hollow composite beams

“…C. A implemented the push-out test and published the shear mechanism on composite shallow cellular floor beams in 2013 [8]. The longitudinal force transferring mechanism, load bearing capacity and failure behavior of the shear connections under direct longitudinal shear forces were investigated by numerical simulation in 2017 [9,10]. However, the behavior of shallow-hollow composite beams with concrete slab cast in place still has not mentioned.…”

Composite slim floor beams with innovative shear connections

“…Test results on 14 push-out specimens with circular openings (Huo and D'Mello, 2013) and 31 numerical simulation results concerning various opening configurations (Limazie, 2015;Limazie and Chen, 2017) were used to calibrate and verify the method proposed in Equation 1. The comparisons are given in Tables 1 and 2.…”

“…Based on detailed FEA and analytical calculations (Limazie, 2015;Limazie and Chen, 2017), the stress concentration and the maximum design stress within the steel beam part were derived, and can be divided into the stresses caused by the composite action within the opening from the longitudinal shear forces and the stresses caused by the bending moment and axial force, as illustrated in Figure 4. Therefore, the maximum design stress within the steel section part can be estimated using…”