Abstract
This paper investigates the seismic behavior of novel stone masonry joints using ductile engineered cementitious composite (ECC) as a substitute for ordinary mortar. Ten stone masonry joints with different types of mortar/ECC were tested under axial and cyclic loads. The filling materials of mortar joints tested included ordinary mortar, polymer mortar, ECC, and composite mortar with two combination proportions of ECC and ordinary mortar. The test results indicated that ECC specimens exhibited a more stable hysteretic response as well as an improvement in strength, deformation, energy dissipation, and strength degradation. The ECC mortar joints maintained integrity during the entire loading process due to the “self-confinement” effect of ECC. A partial substitution of mortar with ECC could provide effective reinforcement and confinement to prevent mortar failure and peeling, thereby allowing such specimens to approach the seismic performance of ECC specimens. Based on the trend of shear strength variations, a corresponding failure process is defined for ECC/mortar joints under cyclic and axial compressive loads, including four distinct stages: linear elastic, crack-developing stage, interface debonding, and friction sliding. New equations are proposed for predicting the shear strength and residual shear strength of the ECC/mortar joints on the basis of the test results, which are validated in the composite mortar specimens.
Highlights
Stone structures are widely used in historical and residential buildings around the world (Figure 1), but their seismic performance has received limited attention
By combining experimental and analytical approaches, as well as field investigations of earthquake damage to stone structures, it has been found that the mortar joint of a stone wall is the weakest zone under earthquake [1,2]
To evaluate the effectiveness of Engineered cementitious composite (ECC) in improving the seismic performance performance of stone masonry joints, a total ofof10the specimens the constructed same size were of stone masonry joints, a total of 10 specimens same sizeofwere and constructed tested under displacement-controlled cyclic loading
Summary
Stone structures are widely used in historical and residential buildings around the world (Figure 1), but their seismic performance has received limited attention. Vasconcelos et al [15] conducted a single shear test of mortar masonry stone wall joints under different axial loads. Compressive stress and mortar strength on the shear performance of the mortar joint there are few further studies of the seismic behavior of stone masonry joints. Wang et al [18] conducted an experimental study to evaluate the seismic performance of there are few further studies of the seismic behavior of stone masonry stone masonry joints under cyclic lateral loads. Engineered cementitious composite (ECC), an ultra-high-performance these mortars exhibit a brittle shear failure mode with low shear strength and ductility. Joint specimens the consisting of of ECC and appraise the influence of axial compressive stress on the seismic behavior of different types of mortar and different levels of compressive stress were tested under. On the test results, which were the experimental fundament of further numerical study
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