Primary Analysis Of Post-cracking Stiffness Of Concrete Bridge Pier With Reinforced Around The Cross Section

As one of the most violated earthquake countries, earthquake disaster is one of serious natural disasters in China. At2:28pm, May12th,2008, the WenChuan earthquake happened in Sichuan province which took a big challenge to the seismic engineering. According to the earthquake observing station, the biggest acceleration was957.7gal at that time, a large of houses and other building were collapse, bridges in disaster area was broken, and transportation was cut off, which made the seismic rescuing much more difficult.In the ductile seismic design analysis of highway bridge, flexural stiffness of ductile structure(pier) should consider as the effective cross-section stiffness. At present, it often compute the cracked stiffness according to test data, empirical formula and finite element software. The research on cracking stiffness of pier is hardly found especially in the theoretical way.In the elastic range, based on the concepts of the mechanics, this paper, researched on the concrete column with reinforced around the cross section. The work of this paper are listed as follow:â‘ According to the theory of the basal mechanics, the section stiffness of pier with reinforced around the cross section was get under the axial force and non-axial force.â‘¡Make a detailed description of the UCFyber of operation steps.â‘¢Analysis bending moment of outside force of pier with reinforced around the cross section.Considered the effects of the additional bending moment in bridge pier cracking.â‘£Introduces the compute theory and steps of bending displacement of pier. Drew the force-displacement curve and the pier stiffness curve based on an example. Through the UCFyber draw moment-curvature curve and moment-curvature curve of theory of bottom section, proved effective section bending stiffness of the theory on the bottom section has certain feasibility.