Theoretical And Experimental Study Of The Seismic Performance Of Large-span Arch Bridge Based On Energy Method

Longspan arch bridge have been widely applicated with its strong spanningcapacity, beautiful modelling, and ecomomic applicability. In consideration of theimportant role which the longespan arch bridge plays in transportation network and itskey position in the social economy, the research on the seismic behavior of langspanarch bridge is a very urgent work. Otherwise, there are no special standard aseismaticdesign specifications for design guiding. Under such background, this paper conductsthe following work:（1）This paper adopts the energy method to construct a MDOF’s seismic energyresponse equation of longspan arch bridge, the influence which three key elements ofground motion(magnitude, duration, spectral characteristics) and the dynamiccharacteristics of the structure (elastic limit, damping ratio) done on the distributionratio of the total input energy, damping energy consumption, the hysteresis totalenergy consumption of longspan arch bridge are reserched. On this basis，the impactof different pier height and reinforcement ratio on distribution patterns of total inputenergy, kinetic energy, damping energy and hysteretic energy are studied. Theapplicability of energy method in seismic engineering is proved by theexamples.（2）Three groups of experimental common contrast piers models (STC,SRC andRC)of longspan arch bridge have been designed and built for comparison. All thehight of piers are1.5m, the section dimension of steel reinforced concrete bridge piersand common reinforced concrete bridge piers are300mm×300mm while thediameter of steel tube concrete bridge piers are300mm. Reinforcement ratio ofSRC,RC and STC piers are1.81%,1.52%and1.63%. The measuring content andloading simulation of arch bridge piers have been determined.（3）A pseudo-static experiment of the common longspan arch bridge contrastpiers has been finished. Loading pseudo static force on the contrast piers under0.15and0.20axial compression ratio to reserch the stress process, the form andmechanism of damage, the energy dissipation capability, the hysteresis energyconsumption, the ductility deformation and the minimum residual plastic deformationof the contrast piers. The author has also completed the comprehensive analysis ofhysteresis curve, skeleton curves, dutility analysis and energy dissipation capacityabout the above piers, revealed the weak positions of those piers in ductility andenergy dissipation aspact.