City Research Online

Abstract

Most available research on analysis of reinforced concrete structures under impact loads focuses on using continuum models such as membrane and solid elements, which renders the problem expensive in terms of computational effort. Therefore, a gap exists in the available literature, as no simple finite element has sufficient capabilities to deal with impact and shock problems while considering detailed local parameters.

Meanwhile, the objective of this research is to develop several non-linear planar finite element models capable of accurately predicting the response of reinforced concrete structures subjected to impact dynamic loading. A mixed and displacement- based element that use an explicit time integration method and consider large deformations are being developed together with a third force-based first-order element that employs the explicit time integration method. A new algorithm that eliminates the need for iterations at the element level is proposed. The strain rate effect is accounted for in the material constitutive models.

The developed explicit fibre beam models, particularly the force-based and mixed elements, represent a simple yet powerful tool for simulating the nonlinear complex effect of impact loads on structures accurately while using very few finite elements. The elements can particularly model fibrous slender reinforced concrete structures and steel concrete panels under impact loading. A simplified procedure is also developed to employ the planar elements in solving three-dimensional problems where the load is applied in the out-of-plane direction. The proposed elements are validated using benchmark experiments available from the literature.

The results of the numerical studies proved the newly developed elements are capable of providing accurate and computationally efficient estimates of structural demands under severe impact loading conditions.

Publication Type:	Thesis (Doctoral)
Subjects:	T Technology
Departments:	Doctoral Theses School of Science & Technology School of Science & Technology > School of Science & Technology Doctoral Theses

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