SHEAR TRANSFER IN COMPOSITE CONTINUOUS ONE WAY PRE-SLABS

Abstract

One of the most common types of the composite concrete elements is the pre­ slab which is used extensively in the construction of both buildings and bridges. It consists of a pre-cast concrete layer serves as a form or skeleton for the cast-in-place layer. The problem of shear transfer is the major in the study of the behavior of pre-slabs to achieve the composite action between two layers.

Many researches had been carried out to study the shear transfer between two concrete layers; few of them studied the behavior of continuous pre-slabs.

In this thesis, the behavior of continuous one way composite Pre-slab was studied. The experimental program consists of two parts; the first part contains testing of 40 push-off specimens consists of two parts cast at different times and subjected to compressive stress normal to the shear plan. The main sh1died parameters in this part were the degree of interface roughness, use of epoxy paint, use of steel dowels with different percentages of area and dowel length, use of concrete shear keys, compressive strength of existing and new part, and using of different stress levels normal to the shear plan. Based on test results of the first part, a suggested theoretical model to predict the ultimate shear strength was presented.