Structure Design Of The New Integral Box-slab High-pile Wharf

Because of its strong adaptability to the foundation, the high-pile wharf becomes a widespread structure pattern in wharf engineering. The high-pile wharf is mainly constituted by the pile foundation underside and the superstructure. With its application in wharf engineering, the high-pile wharf's structure pattern also developments. The development of pile foundation is more obvious, reinforced concrete pile, prestress reinforced concrete pile, prestress large tubular pile, steel tube pile, concrete-filled steel tube pile are all used in design of pile foundation. But mostly, the beam slab structure is adopted as superstructure which causes some weakness in construction and use of high-pile wharf.1. Bottom shape of the structure is complicated with many corner pockets. It congregates salt-laden air and moisture easily, accelerates the corrosion of reinforced concrete, causes bad durability of structures.2.Poor integrity. Because of the weak connect of bents, the integral stiffness of superstructure can't be fully developed;3.Great water construction workload;4. Great in place-cast workload;5.Complicated construction, slow speed.Specially, according to the practical inquisitions of the high-pile wharf, the service life of the high-pile wharf is about 20 years under general circumstance. It will need heavy repair because of badly rust reinforcing bar. This everlasting problem is especially prominent in ports of southern areas.Aim at problems above, Academician Dahong Qiu put forward a new type of high-pile wharf, the integral box slab structure, and organized a research team to carry on the structural design and optimize.This thesis achieved as follows:1.Using the finite element theories, it makes use of software Ansys doing internal force analyze of this structure. Prestress bars will be set according to calculation of internal force.2. On this structure, two-dimension post-tensioning prestress is used upside, unbonding prestress is used sidewise and bonding prestress is used endwise.3.In the Ansys structural calculation, 3D solid element and beam element are combinely used for the model. The superstructure uses solid element, the pile foundation underside uses beam element. But freedom degrees are different between solid element and beam element.