Force–displacement response of in‐plane‐loaded URM walls with a dominating flexural mode

Abstract

SUMMARYThis article presents a new mechanical model for the non-linear force-displacement response of unreinforced masonry (URM) walls developing a flexural rocking mode including their displacement capacity. The model is based on the plane-section hypothesis and a constitutive law for the masonry with zero tensile strength and linear elastic behaviour in compression. It is assumed that only the compressed part of the wall contributes to the stiffness of the wall and therefore the model accounts for a softening of the response due the reduction of the effective area. Stress conditions for limit states are proposed that characterise the flexural failure. The new model allows therefore linking local performance levels to global displacement capacities. The limit states criteria describe the behaviour of modern URM walls with cement mortar of normal thickness and clay bricks. The model is validated through comparison of local and global engineering demand parameters with experimental results. It provides good prediction of the effective stiffness, the force capacity and the displacement capacity of URM walls at different limit states.

Experimental Study on a Self-Centering Earthquake-Resistant Masonry Pier with a Structural Concrete Column

“…Several models have been proposed to predict the force-displacement response of URM walls with a dominant rocking mode [21,22]. Figure 6 indicates expected lateral force-displacement relationships of rocking masonry walls, and the solid curve represents that of piers with an SCC; the dashed curves represent that of piers without an SCC.…”

Influence of eco-friendly ductile cementitious composites (EDCC) on in-plane behaviour of hollow concrete masonry walls

“…In the CdC model these cracking mechanisms are captured by means of mechanical models. Flexural cracking of the wall is accounted for using an approach already employed by Benedetti & Steli (2008) and Petry & Beyer (2015b) whereas the influence of shear cracking on the response of a URM wall is simulated by a novel analytical approach.…”

“…The Timoshenko beam theory was already applied by Benedetti & Steli (2008) and Petry & Beyer (2015b) for the computation of the force-displacement response of URM walls.…”

“…If the wall is un-cracked, the moment of inertia I(x) and the cross sectional area A(x) correspond to the gross section properties of the wall. The effect of flexural cracks (i.e., partial decompression of the cross section as already considered in Benedetti & Steli (2008), Penna et al (2014), Petry & Beyer (2015b)) and the influence of shear cracks (i.e., the formation of characteristic diagonal cracks) on the stiffness of the wall are accounted for by modifying the section properties I(x) and A(x) based on simple mechanical models.…”

Minimal Mass Design of Strengthening Techniques for Planar and Curved Masonry Structures

“…Nowadays, it is a common practice to reinforce such structures by applying tensile reinforcements made of traditional materials, such as steel, or innovative high-strength materials [4,5,6]. Strips and/or meshes of materials like Fiber Reinforced Polymers (FRP) or Fabric Reinforced Cementitious Matrix (FRCM) composites are often bonded to masonry structures to improve their mechanical properties [7,8,9].…”