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<p>Concrete‑filled composite shear walls (CF‑CSWs) are increasingly adopted as core structural systems in high‑rise buildings due to their high strength and compatibility with modular construction. Conventional performance enhancement in these systems is typically achieved by increasing steel plate thickness or concrete strength, resulting in greater material demand and cost. This study evaluates controlled transverse preloading as a means of activating confinement within the existing concrete core to improve lateral performance without increasing material usage. Three 1:6‑scale CF‑CSW specimens with an aspect ratio of 3.0 were tested under cyclic lateral loading. The main variables were the presence of transverse preloading and concrete compressive strength (25&#xa0;MPa and 60&#xa0;MPa). Prestressing was introduced by pre‑tensioning wall connectors to approximately 45% of their tensile capacity. Active transverse confinement increased lateral strength by approximately 16% and ductility by about 10%, while also enhancing post‑peak stability and energy dissipation. By comparison, increasing the concrete strength from 25 to 60&#xa0;MPa resulted in only an 11% increase in strength. A multi‑scale numerical model was established to represent both passive and active confinement mechanisms and to quantify the induced confinement stresses. Parametric analyses further demonstrated that although increasing steel thickness or axial compression ratio enhances strength, such approaches require additional material and may reduce deformation capacity or alter the governing failure mode. Controlled transverse preloading therefore improves seismic performance by mobilizing the inherent capacity of the composite section rather than by material intensification.</p>

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Experimental and numerical investigation of the cyclic behavior of actively confined concrete-filled composite shear walls

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Shahrzad Zabetian,
  • Alireza Rahai

摘要

Concrete‑filled composite shear walls (CF‑CSWs) are increasingly adopted as core structural systems in high‑rise buildings due to their high strength and compatibility with modular construction. Conventional performance enhancement in these systems is typically achieved by increasing steel plate thickness or concrete strength, resulting in greater material demand and cost. This study evaluates controlled transverse preloading as a means of activating confinement within the existing concrete core to improve lateral performance without increasing material usage. Three 1:6‑scale CF‑CSW specimens with an aspect ratio of 3.0 were tested under cyclic lateral loading. The main variables were the presence of transverse preloading and concrete compressive strength (25 MPa and 60 MPa). Prestressing was introduced by pre‑tensioning wall connectors to approximately 45% of their tensile capacity. Active transverse confinement increased lateral strength by approximately 16% and ductility by about 10%, while also enhancing post‑peak stability and energy dissipation. By comparison, increasing the concrete strength from 25 to 60 MPa resulted in only an 11% increase in strength. A multi‑scale numerical model was established to represent both passive and active confinement mechanisms and to quantify the induced confinement stresses. Parametric analyses further demonstrated that although increasing steel thickness or axial compression ratio enhances strength, such approaches require additional material and may reduce deformation capacity or alter the governing failure mode. Controlled transverse preloading therefore improves seismic performance by mobilizing the inherent capacity of the composite section rather than by material intensification.