Abstract
Steel fiber is one of the most widely used reinforcements to improve the performance of concrete members. However, few studies have been proposed to study the seismic performance of bridge piers constructed with steel fiber reinforced concrete. This paper presents the collapse vulnerability assessment of typical single bridge piers constructed with steel fibers. Fiber element models of RC bridge piers with and without steel fibers are firstly built by selecting suitable cyclic constitutive laws of steel fiber reinforced concrete, and then calibrated using the experimental results. The seismic capacity and inelastic demand of RC piers with steel fibers are quantified using both nonlinear static pushover analyses and nonlinear incremental dynamic analyses (IDA). In order to conduct the IDA, a suite of 20 earthquake ground motions are selected and scaled to different levels of peak ground acceleration (PGA). Collapse fragility curves are then generated using the maximum drift ratio of piers as the engineering demand parameter (EDP). In order to investigate the impact of various parameters on the collapse fragility curves, six parameters are considered in the parametric study: peak compressive strength of concrete, yield strength of steel, longitudinal reinforcement ratio, axial load ratio, transverse hoops ratio and steel fiber content. It was observed that the concrete strength, longitudinal reinforcement ratio and steel fiber content could significantly affect the collapse fragility curve of the bridge piers with steel fibers.
Highlights
Bridges play a key role in a highway transportation network since they are the necessary and important link elements of the economic development circles in a country
In order to identify the parameters which affect the seismic behavior of the steel fiber reinforced concrete (SFRC) bridge piers most, six parameters are considered in the parametric study: the compressive strength of concrete, fc, the yield strength of steel, fy, longitudinal reinforcement ratio, ql, axial load ratio, P, transverse hoop ratio, qt, and steel fiber content, Vf
The seismic collapse assessment of the SFRC piers are evaluated through fragility curves, which is a popular tool to estimate the damage probability of bridges at different levels of seismic hazards
Summary
Bridges play a key role in a highway transportation network since they are the necessary and important link elements of the economic development circles in a country. The study showed that the ductility capacity of hollow bridge piers is improved by steel fibers, and that the effect of steel fibers is similar to effect of the transverse hoops for seismic design. Seismic performance of a new bridge pier constructed with steel fibers at design stage is investigated through both nonlinear static pushover analyses (NSPA) and incremental dynamic analyses (IDA). In order to identify the parameters which affect the seismic behavior of the SFRC bridge piers most, six parameters are considered in the parametric study: the compressive strength of concrete, fc, the yield strength of steel, fy, longitudinal reinforcement ratio, ql, axial load ratio, P, transverse hoop ratio, qt, and steel fiber content, Vf. Table 1 lists the details of variable parameters considered in this paper.
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