Seismic And Anti-Collapse Design Of Sea Reclamation Foundation

Many coastal countries and regions pay their attentions to the sea reclamation for the development and utilization in coastal zone in order to seek human survival and production space form the ocean. Due to insufficient consolidating time and high porous water ratio, the sea reclamation foundations are apt to be flushed out and totally destroyed by earthquake, tsunami or huge surfs of wind storms. In this paper a new form of composite foundation made of reinforced concrete frame structures as spatial strip foundation (SSF) in the interior of filling is proposed for theoretical reference and engineering design practice. The main contents of this paper can be divided into the following three parts:I. Action force analysis and the dynamic responses of the composite foundation under the medium intensity El and high intensity E2 of horizontal earthquake; â…¡. The anti-collapse performance of the composite foundation under different wave scouring load intensity; â…¢.Referring to the existing specifications, seismic design, anti-collapse design and anti-corrosion design of SSF to propose the standardized design recommendations of sea reclamation.In this paper, the specific work and some conclusions are listed as follows:1. The composite spatial strip foundation composed of RC frame and their structure form are put forward. The empirical formula of wave scouring force and impact force of the straight and sloped composite SSF and their parameters are chosen and summarized.2. With the finite element analysis software ABAQUS to establish sloped foundation FE analysis model of the reinforced concrete frame structure as SSF, under the design intensity (medium earthquake El) and high intensity (great earthquake E2) horizontal earthquake, the governing member (i.e., longest column AB) as the research object to analysis the displacement, acceleration and forces of the SSF is chosen. The damage and fracture of member section of beams and columns of SSF are analyzed. The deformation ductility and safety coefficient under high intensity earthquake E2 are calculated. The beam and column member design methods, interlayer displacement control, beam-column joint strengthening design and structural measures are put forward.3. Under the downstream and upstream of sea waves scouring or impact loads, multilevel wave scouring load with different tsunami heights and speeds are proposed and calculated. The horizontal and vertical displacement of SSF structure and soil, the stress of both frame structure and the soil contact surface are analyzed. The multilevel checking standards of anti-erosion intensity overload capability and deformation ductility of SSF composite foundation are suggested. At the same time, the formulas and numerical results of displacement ductility factor are given.4. The standardized design recommendations of frame type spatial strip foundation for the sea reclamation engineering are put forward from the following three aspects:the seismic design, the anti-collapse design and the anti-corrosion design to give the design methods and controlling parameters recommendations for strength design, deformation design, anti-slide and stability checking and so on.