Experimental assessment of the effects of biaxial bending moment and axial force on reinforced concrete corner columns

Abstract

In this research, corner columns of low‐rise residential buildings, which might be unstable and vulnerable to seismic loadings during earthquake due to vertical and horizontal irregularities, are tested under different effects from bending moment and axial force. Here, biaxial loading is focused and developed, representing a rhombus path with 100% force in the main direction, versus 30% force in the perpendicular direction. Two of eight test specimens are subjected to axial compressive force at 30% of column capacity, while other specimens are at 10%. The eight test specimens were constructed with varying transverse reinforcement details, to control the column‐failure mechanism. The objective of this research was to investigate the seismic behavior of the corner columns of low‐rise buildings that used ordinary‐moment‐resisting‐frames (OMRF). The test results were discussed to interpret the effect of biaxial loading on the overall performance of the columns using comparison between global and local responses. It could be very helpful in deeply understanding the seismic behavior of structures which were designed in accordance with OMRF requirements. Furthermore, this information might affect decisions about using intermediate‐moment‐resisting frames or special‐moment‐resisting frames, where more demanding seismic requirements are applied.

Influence of shear‐axial force interaction on the seismic performance of a piloti building subjected to the 2017 earthquake in Pohang Korea

“…A nonlinear static pushover analysis was performed to obtain the hysteretic response. Figure shows comparison between the experimental results and the analytical predictions for the four specimens tested by Dang et al . A similar response in terms of both maximum strength and deformation capacity can be observed in Figure .…”

“…Figure 4 shows comparison between the experimental results and the analytical predictions for the four specimens tested by Dang et al. 19 A similar response in terms of both maximum strength and deformation capacity can be observed in Figure 5. Moreover, relatively good agreement in energy dissipation capacity was achieved.…”

“…However, the influence intensity was different during the time considered. At t 1 = 5.88 sec, the drift ratio of the first floor increased by 19 and 28% under the shear effect and shear-axial force interaction effect, respectively. At t 2 = 7.52 s, they were 5 and 8%, respectively.…”

“…A detailed description of the specimens can be found in Ref. 19 For each specimen, the shear spring in the analytical model is represented as a hysteretic shear model under constant axial force in Zeus-NL, and the shear envelope is obtained from Response 2000. A nonlinear static pushover analysis was performed to obtain the hysteretic response.…”

Seismic Fragility Assessment of Columns in a Piloti-Type Building Retrofitted with Additional Shear Walls

“…A three-dimensional model of the target piloti building was created using the above mentioned column and shear wall numerical models. More details about those numerical models can be found in Hoang Dang-Vu et al [44,45]. allows vertical and horizontal wall members to work together.…”