Abstract
In this paper, an analytical investigation is carried out using an open-source FEM software SEISMOSTRUT to analyze infill RC frame with and without chicken wire mesh along with experimental verification. To estimate the equivalent strut width, six models proposed by various researchers are considered to find various failure modes of infills such as in tension, compression and shear. The theoretical model had the same dimensions and load pattern as compared to experimental investigation. For studying the infill wall's lateral load capacity, two specimens were cast, namely infill wall without mesh (B1) and infill wall with mesh (B2). From the experimental investigations, yield displacement (<img src=image/14823722_01.gif>), Initial stiffness (Ki), Ultimate loads (Pu), Ultimate displacement (<img src=image/14823722_02.gif>), Ductility (μ) and Cumulative energy dissipation capacity were estimated. The proposed model is found to be in close agreement with the experimental model results in terms of ultimate load and displacement. The failure mode observed for the infill walls was diagonal tension in the experimental investigation. Based on diagonal tension and corner crushing mode, an equation is derived which is suitable for estimating the equivalent strut width for walls with mesh and the failure loads in compression and tension. The failure loads calculated from the proposed empirical relations are compared with the experimental investigations for verification.
Highlights
Experimental investigation of infill walls is not feasible in many situations due to the cost involved in constructing the model and time required for testing
Experimental investigations were done on B1 and B2 to study the wall's in-plane behavior subjected to lateral load, which is of dynamic nature of push and pull
The schematic diagram of placing of wire mesh on the infill wall's surface is shown in figure 2. 4 numbers of 8mm diameter rod of grade Fe 250 provided for each column which is laterally tied on all four corners
Summary
Experimental investigation of infill walls is not feasible in many situations due to the cost involved in constructing the model and time required for testing. Since the infill wall's behavior is a complex phenomenon, the study of various parameters is a difficult task [1]. Macro-models are more simplified than Micro-models as the Macro-models represent infill masonry panels' global behavior and their impact in building response. A method as an equivalent strut to be representing the masonry infill which carries out a portion of the horizontal loads applied and relieves stresses on other structural components. This leads to redistribution of stresses and can lead to localized stress resulting in localized cracking. Macro-models can be designed as a continuum macro element or equivalent strut model.
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