Evaluation of 'Formwall': A Post-Tensioned, Dry-Stacked Masonry System

摘要

This study examined the constructibility, feasibility, and flexural behavior of anew and untested post-tensioned, dry-stacked concrete masonry wall system--know as Formwall --as proposed by the National Concrete Masonry Association. The evaluation was conducted through mathematical predictions, wall construction, and experimental testing. To substantiate the findings, comparisons were made between the dry-stacked Formwall system, a conventional nonreinforced (plain masonry) wall panel with Type S mortar, and a dry-stacked wall panel using conventional six-inch concrete masonry units. Based on the test results of this study, the proposed Formwall system has virtually no structural capacity due primarily to stability issues stemming from problems with the geometric shape of the face shells and lack of composite action between the face shells and ties. Notwithstanding, it is the author's opinion that there is merit in pursuing the development of a dry-stacked masonry system. And when perfected, post-tensioned dry-stacked masonry could result in significant savings for roadside barriers, landscaping elements, basement walls for low income housing, and temporary structures.