| With the development of technology and economy, the industrialized degree of commodity is growing higher. In the construction of bridge, people pursue short time, high efficiency and high quality, and the requirement to environmental protection is also enhanced. According to the development of material science as well as technology of bridge designing in recent year, pier structure has tipped to the direction of light type, high strength and fast construction. At present, most of the bridge superstructure can be precast in our country, and the relevant Codes and National Standard are existed. At the same time, the production scale of superstructure has preliminarily formed industrialization. However, the substructure prefabrication is still in the preliminary test stage, and the way of bridge prefabrication is seldom used in construction of substructure. There are three basic factors people require in construction project:short construction period, low cost and good quality. In addition, low noise, material saving and environmental protection is becoming increasingly important. Currently, the assemblage of bridge is future development. Compared with the foreign advanced technology and rich experience in assemblage constructions of bridge, our country started rather later.The paper mainly studies on assemblage bridge pier in the range of small bridge. Firstly, using mathematical programming method to optimize the cross-section of the pier, HyperMesh is used for optimization calculation for bridge pier, and then checked the optimization results of stability, finally, to analyze static characteristics to the substructure after optimization of bridge pier by MIDAS FEA software. The results are as follows:(1) Get the optimized parameters of the bridge by the software optimization, the height of the bridge pier is6m, outer radius is0.75m, pier wall thickness is0.33m.(2) The stability of the bridge pier after optimization can conform to the standard requirements, and the stability coefficient is greater than1.7.(3) In the stage of construction, the most-positive cross section pressure stress and the maximum principal stress value of bridge pier were12.25MPa and12.58MPa, the value can satisfy the requirements of the standard.(4) In the use of stage, pier appeared the most-positive cross section pressure stress which was15.94MPa, and maximum principal stress was16.39MPa, they were less than the standard limit.In this paper the design of assembled substructure scheme meets the using requirements, the stability coefficient and static characteristic value satisfies the standard of the design requirements, the single pier saves the2.77m3concrete. |
