Numerical prediction of concrete slab response to blast loading

Blast-resistant characteristics of ultra-high strength concrete and reactive powder concrete

There are several types of composite construction such as reinforced concrete (RC) sections, concrete-filled tubes (CFT), composite beams, floors and frames, steel–concrete–steel sandwich (SCSS) double skin panels and concrete-filled double skin tubes (CFDST). This paper focuses on CFDST. It gives the background, advantages and challenges of CFDST. The behaviour of such members subjected to static and dynamic loads are described. Future research in this area is pointed out.

Double skin composite construction

Bending response of web-core sandwich beams

In this paper, a truss-core sandwich panel is introduced and its elastic properties are presented. Two thin flat sheets, separated by two inclined plates acting as the core and rigidly jointed at their ends, characterize the sandwich section. This construction form eliminates most of the attendant problems of conventional spot-welded or rivet-fastened sandwich panel construction. Advantages of the truss-core panel are discussed. The 3D sandwich panel is idealized as an equivalent 2D orthotropic thick plate continuum. Equivalent bending, twisting, and transverse shear stiffness are derived, and the influence of the relatively weak shear stiffness on the behavior is discussed. By integrating these elastic stiffness constants into closed-form solution, panel response is calculated. The calculated results, which requires significantly less computational effort, agree well with 3D finite-element analysis. Comparisons of stiffnesses and deflections with the corresponding responses of conventional sandwich construction are provided. This study indicates that the truss-core sandwich panel performs better due to its inherently higher flexural resistance per unit weight.

Elastic Stiffness Properties and Behavior of Truss-Core Sandwich Panel

Composite structural panels subjected to explosive loading

A sandwich unit in which the two facing plates are separated but rigidly connected by two inclined trusses (truss-core panel unit) is investigated. A number of these units can be welded along the facing plates to form a truss-core sandwich panel. The sandwich panel is transformed into an equivalent homogeneous orthotropic plate for which analytical solution or 2-D finite element solution may be obtained. This requires the development of bending, twisting and transverse shear stiffnesses of the orthotropic plate. Formulation of these stiffness parameters is presented. By incorporating these derived stiffness parameters into analytical solutions, the response of several truss-core panels are obtained. The predictions are in excellent agreement with numerical results from a 3-D finite element analysis.

Leonard Heng

Papers

Composite structural panels subjected to explosive loading

Equivalent Stiffness Parameters of Truss-Core Sandwich Panel