Stability Of The Two-column Steel Pipe Concrete Piers And Reinforced Concrete Columns

Double concrete-filled steel tubular laced columns can obtain larger cross-section bending stiffness with small section, so they can fully express the advantage of high ultimate strength of concrete-filled steel tubular and have good economic advantages. This paper structures double concrete-filled steel tubular laced columns according to stake piers and puts them into use as piers. Spirally reinforced concrete cylinders can be taken as high piers because they have high ultimate strength,good ductility and seismic performance. Therefore it is necessary to make a research on the stability and mechanical performance of concrete-filled steel tubular laced colums and reinforced concrete cylinder piers. Based on the achievements of previous studies, several parts are included in this paper as follows:1. Calculate the ultimate bearing capacity of double concrete-filled steel tubular high piers using finite element analysis software ABAQUSand analyze the influence factors of the ultimate strength.Then the quantity of materials and stiffener are compared among concrete-filled steel tube piers,double concrete-filled steel tubular laced columns and double concrete-filled steel tubular laced columns with connecting beam in the middle when they have the same ultimate bearing capacity.2. The relationship between load and strain of reinforced concrete cylinder under axial compression is researched by numerical integration method and finite element analysis software ABAQUS.The load-strain curves calculated by these two method have good agreement with the experimental curve.3. The relationship between load and displacement of reinforced concrete beam-column under the horizontal load and axial pressure whose head is free while bottom is clamped is researched by numerical integration method and finite element analysis software ABAQUS.The load-strain curves calculated by these two method have good agreement with the experimental curve.4. The influence factors of the ultimate strength are considered respectively using numerical integration method and finite element analysis software ABAQUS in the analysis of reinforced concrete beam-columns.5. Using the relevant parameters of existing reinforced concrete high bridge piers to design reinforced concrete cylinder piers and the effect of gravity on the ultimate bearing capacity is analysed. The results show that gravity can't be neglected.