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Title:	Behaviour of web opening and concrete filled hollow steel tube as shear connectors under direct shear force for slim floor system
Authors:	Emad Hosseinpour (P73022)
Supervisor:	Shahrizan Baharom, Dr.
Keywords:	Composite construction Composite materials -- Mechanical properties Structural optimization Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia
Issue Date:	12-Aug-2017
Description:	Composite steel-concrete slim floor construction is an economical floor system proposing minimum floor depth and fast construction besides architecture requirements. In this system, the concrete slab is supported on the lower flange of the steel beam using either in-situ or pre-cast technique, which eliminate the use of the down-stand beam, hence giving a flat look. The composite interaction between steel and concrete is provided by shear connectors installed on the steel beam web and embedded in concrete slab. Recently, the combination of cellular in steel beam web, headed shear stud and tie-bar was used to improve the shear strength of the slim floor system. The main failure modes were found to be welding fractures at shank of the headed stud and concrete splitting where the infilled concrete failed due to the knife load produced by the thin steel beam web. Moreover, the tie-bar placed at top of infilled concrete ruptured when punched by the steel beam web and could not prevent splitting failure of the infilled concrete when placed at centre and bottom. Therefore, hollow steel tube (HST) shear connector is proposed to avoid premature failure that could occur in concrete and steel beam web. HST shear connector is welded to steel beam web opening (WO) and filled with concrete. The main aim of this research is to investigate direct shear transfer mechanism of concrete filled HST shear connectors. A total of 16 specimens were tested under static push-out test, and two specimens with headed shear stud were used as a reference. The varied experimental parameters were the concrete compressive strength and shape of the WO and HST; the circular, rectangular and square. The finite element (FE) models were developed using ABAQUS software; then, they were verified using experimental test results. Further 208 FE models were developed to examine parameters not considered in the experiments, including sizes of the WO and HST, web thickness of the steel beam, thickness of the HST, length of the HST and the compressive strength of concrete. Group arrangement of the shear connectors was analysed using additional 122 FE models through various spacing between the connectors. The results obtained from the FE analyses were used to develop design calculation in predicting the shear strength of the WO and HST shear connectors. The experimental test results showed that the HST shear connector type achieved higher shear strength than the WO type, specifically with the same openings area. Where, the specimens with circular and square HST type achieved shear capacities 6.3 and 8.0 times higher than those with the WO type, respectively. Furthermore, the ductility of the specimens increased by 3-4 times when the HST shear connector was used compared to WO. In addition, the specimen with square HST type achieved higher shear strength than the circular one. The same finding was recorded for the WO shear connectors type. The results of the FE analysis showed that higher shear load resistance was achieved with higher concrete strength and larger size of WO and HST shear connectors. It was also found that the optimal spacing between the group WO shear connectors was 250 mm and 300 mm for CWO and SWO/RWO, respectively; while the optimal spacing was 300 mm between group CHST and 350 mm between SHST/RHST. The predicted results from the suggested equations were very analogous to the experimental ones, with mean values of 98% and 97% for the WO and HST shear connectors, respectively.,Ph.D.,Certification of Master's / Doctoral Thesis" is not available"
Pages:	215
Call Number:	TA664.H647 2017 3 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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