Deflection Analysis of Layered Slabs with Plastic Inserts.

Area of Science:

• Civil Engineering
• Structural Engineering
• Materials Science

Background:

• Layered reinforced concrete slabs with plastic inserts offer potential for reduced material usage and improved structural performance.
• Understanding the behavior of these composite structures, particularly the bond between layers, is crucial for accurate design and analysis.
• Existing methods may not fully capture the non-linear behavior and bond characteristics of such layered systems.

Purpose of the Study:

• To develop and validate an analytical method for calculating the deflection of layered reinforced concrete slabs with plastic inserts.
• To investigate the influence of bond shear stiffness and contact zone width on slab deflection.
• To compare analytical and numerical results with experimental data for layered concrete structures.

Main Methods:

• Experimental testing of layered reinforced concrete slabs with spherical plastic inserts.
• Development of an analytical method based on built-up bars theory for non-linear deflection calculation.
• Numerical simulation (finite element analysis) of the layered slab behavior.
• Parametric analysis to assess deflection sensitivity to bond shear stiffness and contact width.

Main Results:

• The proposed analytical method and numerical simulations accurately characterize the behavior of the layered slabs.
• Calculation results from the analytical method showed good agreement with experimental data.
• The shear stiffness of the bond between prefabricated and monolithic concrete layers was identified as a critical factor influencing slab performance.
• Slab failure was observed to occur when the bond is damaged, leading to layer slip in the support zone.

Conclusions:

• The developed analytical approach provides a reliable tool for predicting the deflection of layered reinforced concrete slabs.
• The shear stiffness of the interlayer bond is a dominant parameter affecting the structural integrity and performance of these slabs.
• Further research into optimizing bond characteristics could lead to enhanced durability and load-bearing capacity of such innovative structural elements.