Experiment Research And Finite Element Analysis On Thick Pile Cap

With the development of tall -building and skyscraper, pile foundation is more and more used in project with its high supporting capacity and strong suit in reducing the uneven settlement of groundsill. As an important part of pile foundation, plies cap is a connecting link between the preceding and the following and should be taken into account in designing. Therefore making a thorough research on mechanic performance of piles cap has significant theoretic meaning and referenced value in engineering.On the basis of early fruit, this paper emphasizes the influence on ultimate bearing capacity of thick piles cap with different reinforcing steel bar collocation, as well as analyses the load-transferring mechanism and destruction mechanism to the six-pile caps..This paper summarizes the production in pile caps and design methods in national criterion. 12 RC piles cap specimens in 1/5 ratio, in which 4 specimens are four-pile caps and 8 are six-pile caps are tested in the experiment. Four four-pile caps have wholly different steel bar collocation; six-pile caps have two kinds of component :single pillar and double pillars,Each kind has two types of steel bar collocation: centralized collocation around the pillar and well-proportioned at the bottom.After experimental research on four-pile thick caps, we find steel bar collocation have a significant effect to the ultimate bearing capacity of pile caps among other factors, such as effective highness, intension grade of concrete, the ratio of shearing force and span and the amount of lengthways reinforcing steel bar at bottom. So we should attach importance to the steel bar collocation.On the basis of experimental research and finite element analysis,much works has been done in this paper:1. On the basis of experimental research and finite element analysis,we can find the effect to ultimate capacity of thick pile caps of different configure of reforcing steel bar much more ,I contrast the experimental results to the finite element analysis results2. On the comparatively analysis of various design method to pile caps ,studied the nonlinear finite element mechanics model of steel fiber reinforced concrete ,applying finite element analysis software ,the load-transferring mechanism of four-pile thick caps is tension and compression link ,the transferring pattern of stress of six-pile caps accords with the transferring mechanism of spatial tied arch., this conclusion has much academic significance to further research, especially to many-pile caps to load transfer mechanism and to establish the reasonable design method.3. Obtaining four and six piles caps destruction mechanism through experimental research and finite element analysis ,especially to the six-pile with single pole caps ,further made conclusion and analysis to them.Finally,some problems,which remain to be studied ,are put on the basis of concluding the researching works in the paper.