Experimental Study And Analysis On Prestressed Precast Segmental Concrete Bridge Piers

With the needs of national development, in order to further promote the national construction, China is actively planning a cross-sea bridge Strait, high-speed rail viaduct, high-speed overpass, urban interchange and other construction projects. However, the current bridge design challenges faced two challenges, one is to meet the safety and durability of bridge structures; the second is the use of new techniques to shorten the construction period, in order to reduce traffic congestion, bad environment ecological impact of construction in noise generation. These problems raise not only requires to improve construction techniques, but also the need to introduce new or innovative design concepts and the use of a large number of effective tests to achieve a breakthrough. Assembled pier segments China is still in research stage of development, and the technology is not mature. But we should see, PREFAB architecture in disaster rescue, large sea-crossing(Cross River) engineering and other fields with good prospects, its shortcomings by rational design segment size and seams connecting structure to overcome.Taken together, this paper mainly in the following sections:①Based on the large number of domestic and foreign literature review summarizes the domestic and foreign researchers experimental and theoretical studies done for precast segmental bridge columns, clear history of the development and direction of development of such piers system. Meanwhile, the technology at home and abroad are summarized practical engineering situation.②To study the seismic performance and failure mechanism of prestressed precast segmental bridge columns, developed a set of feasible pseudo-static test program. The program consists of five groups of such specimens, including the completion of the pilot phase of the two specimens, the current production and the completion of the test specimen in which a group of late three specimen.③ has been compeleted by the quasi-static test, comparative analysis of failure modes of three groups of specimens, damageable parts, hysteretic behavior, skeleton curve, stiffness, ductility, residual deformation, prestressing steel stress, curvature.④Structural analysis software OpenSees as a computing platform, through the establishment of three-dimensional finite element model of the nonlinear fiber beam-column element of the seismic performance of precast segmental bridge columns numerical simulation analysis. The main results of numerical simulation and experimental structure of the third group of specimens were compared to verify the finite element method for the numerical simulation of its reliability.⑤After three specimens without shear key settings. Through different forms of prestressed prestressed connected to form a seam, calculate different prestressed simulated specimen analyzed by finite element model was established. Comparing each specimen hysteresis curves and skeleton curves, a preliminary analysis of the impact of the size of prestressed seismic performance of the finite element model.(5) After three specimens without shear key settings. Through different forms of prestressed prestressed connected to form a seam, calculate different prestressed simulated specimen analyzed by finite element model was established. Comparing each specimen hysteresis curves and skeleton curves, a preliminary analysis of the impact of the size of prestressed seismic performance of the finite element model.