Stress monitoring and impact bearing capacity of circular concrete-filled steel tubular short columns under axial impact loads

Abstract

Compared with the traditional reinforced concrete columns, the concrete-filled steel tubular columns with a better restraint effect of steel tube on core concrete showed higher bearing capacity and ductility under static loads. However, except static loads, concrete-filled steel tubular columns are commonly exposed to the extreme dynamic loads including earthquake, explosion, and impact. The study on dynamic behavior of concrete-filled steel tubular columns is extremely significant to ensure their safety against such dynamic loads. In this article, a polyvinylidene fluoride piezoelectric smart sensor was proposed to monitor the axial impact bearing capacity of specimen based on stress monitoring under impact loads. The concrete-filled steel tubular columns with smart sensor embedded were tested, which considered the effects of both hammer impact heights and steel tube thickness on the axial impact bearing capacity. The impact bearing capacity calculated based on the monitoring results of polyvinylidene fluoride sensor is in good agreement with the measured values, which verifies the feasibility of this method. Moreover, it is found that the failure mode of concrete-filled steel tubular short columns is the local tearing failure or local buckling. In addition, non-linear finite element models were also established to study the effect of different parameters on the axial bearing capacity. The simplified formula for calculating the axial impact bearing capacity of concrete-filled steel tubular short columns was proposed based on the large amount verified model. Through the comparison between the calculation value and the test value, the formula is found to well reflect the axial impact bearing capacity of concrete-filled steel tubular short columns, which provides a reference for similar research.

Attenuation characteristics of stress wave in cracked concrete beam using smart aggregate transducers enabled time-reversal technique

“…Concrete structures, because of their main advantage of low cost, are still the most popular structures in civil engineering. To mitigate the disadvantages of low tensile strength, concrete are often reinforced with steel bars to form the reinforced concrete (RC) or integrated with more sophisticated forms, such as tubes, to form the concrete filled steel tubes (CFST) (Chen et al, 2019; Li et al, 2019a) or plates, to form the steel-plate concrete composite structures (Kong et al, 2018; Qin et al, 2015), to achieve improved performance by combining the advantages of concrete and steel. Like many other civil structures, concrete structures are often deployed in environment with severe service conditions, and are exposed to corrosion (Li et al, 2017; Peng et al, 2019a; Xiao et al, 2020), vibrations (Wang et al, 2019; Yin et al, 2019), impacts (Zhu et al, 2017), and seismic loads (Ahmad et al, 2019).…”