An experimental study on the structural performance of reinforced concrete low-rise building columns subjected to axial loading

Abstract

It has been commonly recognized by the international research and practice community that the presence of both outer and inner stirrups may significantly enhance the axial load capacity of reinforced concrete (RC) columns. However, there is limited testing evidence to support this conclusion that has been published nationally. This paper reports an experimental programme to study the effectiveness of stirrup detailing on the structural performance of columns having small sectional dimensions that are common in low-rise building structures. Nine column specimens with the same geometrical dimensions of 220 mm x 220 mm x 880 mm in three batches were detailed with different stirrup categories, have been gradually axially loaded to failure. The test data have revealed that although the presence of stirrups can generally enhance the axial load capacity of the column specimens, the enhancing levels are much dependent to the shapes of the stirrups. Selected interesting aspects of the test results have also been discussed, which set a concrete base for recommendations for design and detailing of such vertical structural elements.
 Keywords:
 experimental investigation; low-rise building columns; axial load capacity; stirrups.

Nghiên cứu thực nghiệm ảnh hưởng của áp lực bó đến cường độ chịu nén của bê tông

“…Theo Phạm Xuân Đạt và cộng sự (2020) [3], tác giả thực hiện các thí nghiệm trên 16 mẫu cột 150mm và chiều dài 600mm với bước đai và mác bê tông khác nhau. Qua đó, tác giả xác nhận các kết quả nghiên cứu quốc tế bao gồm: hiệu ứng bó do cốt đai gia tăng đáng kể khả năng chịu tải trọng nén của cấu kiện chịu nén, dạng phá hoại điển hình của cấu kiện gồm sự vỡ bê tông và sự mất ổn định của thép dọc, sự gia tăng hiệu ứng bó có thể được mang lại từ việc giảm bước đai.…”

Experimental and Numerical Analysis of Concrete Columns under Axial Load Based on European Design Norms

“…Their main goal was to analyze the effect of load eccentricity. Besides the dimensions of the cross-section, material properties, static schemes, and the longitudinal reinforcement area, the area of transverse reinforcement (stirrups) also has a significant effect on the load-bearing capacity of columns [12,13]. During the design of reinforced concrete members, the approach to problem-solving is crucial, especially the selection of calculation methods.…”

Numerical analysis of seismic behavior of square concrete filled steel tubular columns

“…Also, in Vietnam, there is a lack of reasonable concrete models proposed for simulation purpose. There were some experimental studies on this field, for example, an experimental investigation on the effectiveness of stirrup detailing on the structural performance of reinforced concrete columns was studied by [22]. In particular, to overcome the limitation of experi-mental database in the case of testing full-scale specimens, this study focuses on performing numerical investigations on the seismic behavior of square CFST columns with high axial load levels.…”