Models for behaviour analysis of monolithic wall and precast or monolithic floor slab connections

This paper presents the comparative analyses of experimental and numerical research results of RC connections between the precast slab and monolithic wall (Type 1), and both monolithic slab and wall elements (Type 2). Type 1 was applied in prefabricated building system developed in Tuzla, Bosnia and Herzegovina, as the most sensitive part of the structure. In order to provide a favourable response of the bearing structure connections under seismic load (Type 1) it is dislocated in the span. In order to compare the behaviour of listed structure connection types, three specimens made of precast slabs and monolithic wall as well as three specimens made of monolithic slabs and walls were tested under quasi-static load. Thus, the mathematical models are proposed in order to analyse both types of connection, based on the exact method of displacement and FEM. Furthermore, the stiffness matrix is modified by introducing the stiffness parameter (semi-rigid) connection. The approximate Strut and Tie model is proposed according to the stress field analysis obtained by FEM.

► Connections of two slab types: 1 – precast and 2 – monolithic; and monolithic wall are studied.
► Bearing capacity of Type 1 compared to Type 2 connections is 11.5% lower.
► Connections yielding of Type 1 compared to Type 2 increases at a load >1.33Pserv.
► Stiffness reduction of Type 1 connections is greater 17.95–20% compared to Type 2.
► Introducing semi-rigid connection into stiffness matrix gives satisfactory outcomes.