[CCoE Notice] Doctoral Dissertation Defense Announcement-Jamshaid Sawab-Monday, April 29th 2019 @ 10:00am in the CEE Conference Room N137

[Knudsen, Rachel W]

Doctoral Dissertation Defense Announcement

COMPOSITE STEEL PLATE CONCRETE (SC) STRUCTURES: THEORY AND EXPERIMENT

Jamshaid Sawab

Date: Monday, April 29th 2019

Time: 10:00 AM – 12:00 PM

Location:Civil & Environmental Engineering Conference Room

Committee chair:Dr. Y. L. Mo

Committee members: Dr.Thomas T. C. Hsu, Dr. GangbingSong, Dr. Mohammad Y. Mansour, and Dr. Arghadeep Laskar

ABSTRACT

Composite Steel plate Concrete (SC) structural system has gained popularity as an advanced modular construction techniqueowing to its many advantages. Recently, they have been used to make an efficient structural system for important structures, such as nuclear containment. The use of SC structures has been reported in Small Modular Reactors (SMR), pressurized water reactors and the new generation of nuclear power plants.

The design of such large, important and complex structures requires engineersto know the behavior/responseunder the applied stresses. A wall- or shell-type SC structurecan be discretized as an assemblage of simple elements.If the behavior of one element corresponding to the applied stress state is well-understood, the response of the entire structurecan be predicted by mechanicsprinciples and finite element method. A mechanics-based SC MembraneModel (SC-MM) has been proposedfor predicting the response of SC wall-type structures. The model satisfies mechanics principles, treats cracked concrete as a continuous materialand utilizes realistic constitutive material laws for steel plate and concrete. The application of the SC-MM model depends on the development of a set of realisticconstitutive material laws for steel plate and concrete.

The constitutive materiallaws and behavior of SC elements were experimentally investigated by conducting in-planeuniaxial tensionand compression tests, in-plane pure shear tests,and out-of-plane shear tests. A totalof four experimental programs were designed, whichcomprised of 33 large-scale specimens. The failure mechanisms and applicability of design codes and guidelines to estimate the out-of-plane capacities were investigated. A desiredout-of-plane failure mechanism such as flexure or shear can be attained only if the providedcomposite actionis sufficient, withoutwhich ‘debonding’, the failure mechanism associated with compositeaction, would govern. Analytical models for the stress-strain relationships of concrete in in-plane tension and compression, as well as for the steel plate stiffenedthrough tie bars are proposed. The concrete crackingstrength is affectedby the presence of tie bars. Post-cracking tensile stresses in concreteare found to be a functionof the composite actionbetween steel plate and concrete through tie bars. The so-called“softening effect” in concrete could be mitigatedby the confinement effect present in steel plate elements. The stress-strain curve of steel plate in an SC element does not exhibit a distinct yield point and the apparent yield stress is found to be a function of the amount of tie bars. The stress-strain curve of steel plate in compression is affected by bucklingand is a functionof the slenderness limit. Slenderness limit is proposed to avoid local bucklingbefore yielding of the steel plates.

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