The Influence Analysis of the Connection Form of Pile-Raft and Vertical Degree on Pile Stress

The different pile-raft connection forms of ordinary pile foundation, composite pile founfation, rigid pile composite foundation and the vertical degree of the pile body have a great influence on the internal force of pile. The existing specifications and the calculation method only make the description of determining the nature, without quantitative analysis and given the difficulties to the design and calculation. The paper analyses the effect of different connection forms of pile-raft on pile stress under the same condition, respective designed by ordinary pile foundation, composite pile foundation, rigid pile composite foundation and obtain each form of pile stress by m method. Also calculating the influence of the vertical degree according to the allowable deviation of the existing specifications. The result showed that, if only the horizontal load in considered, the ordinary pile foundation and composite pile founfation have a large moment on the one quarter of the pile top and the rigid pile composite foundation is far less than the two former. If the allowable deviation of the existing specifications are in considered, the pile stress of rigid pile composite foundation have increased a lot and close to the two former in numerical. The rage of the one quarter of the pile top should strength the reinforcement, the plain concrete pile in refuse in the rigid pile composite foundation, the other place can decrease requirement.