Nonlinear Finite Element Analysis of Seismic Performance of Concrete T-shaped Beams with Fabricated Steel Bars
As a vital component of construction industrialization,fabricated steel bar utilizes an approach of centralized processing and distribution,which has the characteristics of high construction efficiency,consistent quality and favorable cost-effectiveness.Reinforcement framework and welded steel fabric are two common types of fabricated steel bar.Nonlinear finite element models for concrete T-beams with fabricated framework in web and welded steel fabric in flange were established based on ABAQUS.The models considering fabricated steel bar configuration were validated by previous test results.The effect of fabricated framework types(manually tied steel bar,fabricated steel bar using hooped stirrup,fabricated steel bar using passed through stirrup),beam types(cast-in-place,composite),concrete types(C30,C40,C50),longitudinal reinforcement ratios(0.4%,0.6%,0.8%,1.2%)and transverse reinforcement ratios(0.2%,0.4%,0.6%)on the seismic behaviour of concrete T-beams with fabricated steel bars was studied.The results showed that the load-displacement curves of the composite T-beam with hooped stirrup,composite T-beam with passed through stirrup and cast-in-place T-beam with manually tied steel bar were relatively similar,exhibiting a displacement ductility ranging from 4.4 to 5.2;Compared with the hooped stirrups reinforced composite T-beams with 0.4%longitudinal reinforcement,the positive and negative flexural capacity of the specimens with 0.6%to 1.2%longitudinal reinforcement increased by 25%to 93%and 18%to 48%,respectively,and the positive displacement ductility decreased from 4.3 to a range of 4.2 to 4.0 when the negative displacement ductility decreased from 5.0 to a range of 4.8 to 4.5;The skeleton curves of composite T-beams with hooped stirrups were similar to that of cast-in-place T-beams,and the positive and negative flexural capacity of the composite beams were 6%and 10%lower than those of the cast-in-place beams,respectively.The concrete strength and transverse reinforcement ratio had less influence of 4%on the flexural capacity and displacement ductility of composite T-beams with hooped stirrups.Overall,it demonstrated that concrete T-beams with fabricated steel bar exhibited good seismic performance and fabricated steel bar could be a viable alternative to traditional manually tied steel bars.
NETL
NSTL
万方数据
维普
