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2. PHD Thesis / Tesis PHD
3. Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

Title:	Behaviour of tapered composite plate girders with solid webs and webs containing openings subjected to shear
Authors:	Qahtan Adnan Hasan (P69999)
Supervisor:	Wan Hamidon Wan Badaruzzaman, Prof. Dato' Ir. Dr.
Keywords:	Composite materials
Issue Date:	3-Aug-2018
Description:	In civil engineering applications, when a hot-rolled steel I-beam section is insufficient to resist the bending moment and shear loading over a long span, a built-up plate girder is employed to satisfy the requirements of a sufficient section. Over the past few decades, considerable researches have been carried out on the behaviour of prismatic plate girders using physical, theoretical and numerical methods. This thesis presents research on tapered composite plate girders with solid webs and webs containing opening under shear effect. The objectives of this thesis are, (i) to develop analytical methods to predict the behaviour of tapered composite plate girders with or without web openings, (ii) to evaluate the actual behaviour of tapered composite plate girders with or without web openings under shear effect, and (iii) to develop finite element model and conduct parametric studies to examine the effects of degree of web taper, size and shape of web openings, web slenderness, panel aspect ratio, and flanges stiffness on the shear capacity of composite plate girders. Three composite plate girders with various web taper angles without openings were tested in the laboratory. In addition, a composite plate girder with tapered web with opening, and a prismatic composite plate girder were tested. The collapse behaviour of such girders were observed experimentally to occur in 4 phases; firstly, local web buckling occurs under the critical shear stress; secondly, the formation of tensile membrane stress in the web carries the additional load after the web has buckled; thirdly, the membrane stresses together with the critical shear stress will carry any further load, and finally, collapse occurs with the formation of plastic hinges on the top and bottom flanges, then extensive crack of the slab after the steel girder exhibited severe web buckling. The shear capacity dropped marginally in girders with smaller degree of web taper (5°), compared to 38% for bigger taper angle of 15°. This is also confirmed by the FEM and analytical results, thus both the FEM and analytical method are verified accurately by the experimental results. The FEM parametric studies discovered that the shear capacity is significantly influenced by the web slenderness (27% increase when plate thickness is increased from 3 mm to 5 mm), and concrete slab (56% increase compared to steel girder alone). On the other hand, the influence of flange stiffness is less significant with only 20% increase in shear capacity when the flange thickness is increased from 10 mm to 30 mm. Results obtained for tapered composite plate girders with opening show that the ultimate shear capacity is influenced significantly by the size of the openings regardless of the shape of the opening. It is concluded that plate girders containing web openings are affected by the change in taper angle similarly to those with solid web.,Certification on Master's/Doctoral Thesis" is not available
Pages:	242
Call Number:	TA418.9.C6H337 2018 3 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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