This paper presents a three-dimensional finite difference numerical analysis of cap-pile system under earthquake. The deformation law of the cap-pile system and the variation characteristics of the axial force and moment of the pile are obtained. Under the action of earthquake, the settlement of the cap is increasing, and finally did not retrace, while the axial force and bending moment of the pile, present the trend of increasing first and then reducing, and the withdrawal efforts are great. The force and displacement are not completely corresponding relationship under the action of the earthquake. The moment of the pile swings at 0 o’clock under earthquake.
In order to study the effect of fiber and slag on the performance of high performance recycled aggregate concrete, polypropylene fiber/steel fiber and slag are selected as admixtures, in which fiber is used as admixture and slag is equivalent to replace cement content. The influence of recycled aggregate content, admixture formula and admixture on the mechanical and water absorption properties of high performance recycled concrete and its improvement effect were analyzed systematically. The results showed that when the slag is added, the early mechanical properties of concrete have little effect, the later is slightly improved, but the water absorption of concrete is improved significantly. Adding fiber can not only improve the compressive strength, splitting tensile strength and flexural tensile strength of high performance recycled concrete, but also significantly improve the water absorption properties. Fiber and slag composite modified material can bond concrete mixture into a whole and improve the density of the mixture.
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