|Table of Contents|

Influence of Superstructure Stiffness on Pile Foundation Cap with Waterproof Slab(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年02期
Page:
39-47
Research Field:
Publishing date:

Info

Title:
Influence of Superstructure Stiffness on Pile Foundation Cap with Waterproof Slab
Author(s):
LIU Rong-gui1 XI Yi-chao1 LU Kai-ming2 LU Shao-hui2
(1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, Jiangsu, China; 2. Nanjing Construction Industry Group Co., Ltd., Nanjing 210012, Jiangsu, China)
Keywords:
coaction superstructure stiffness pile foundation cap waterproof slab layer-by-layer construction
PACS:
TU473
DOI:
-
Abstract:
Based on the elastic theory and the deformation compatibility relationship, the pile-soil stress estimation formula for pile foundation cap with waterproof slab was deduced. The coaction model of superstructure-pile foundation cap with waterproof slab, and the coaction model of only pile foundation cap with waterproof slab were established by ABAQUS. The influences of superstructure stiffness on the foundation reaction force, pile-top reaction force and internal force and deformation of foundation floor were compared and analyzed. The ratios of actual reaction force to design reaction force at different locations were calculated. The construction process was simulated by using the “life and death element” technology, and the variation law of load distribution ratio, differential settlement of unit load and bottom bending moment with construction story were studied. The results show that the load distribution is related to pile-soil stiffness ratio, hardness of bearing layer, column spacing and thickness of waterproof slab, etc. The bottom soil of waterproof slab can bear about 20% of the load of superstructure. After considering the superstructure stiffness, the distribution of bottom reaction is more uniform, the overhanging effect of waterproof slab is not obvious, and corner piles and side piles increase the load, while the middle piles unload,the differential settlement of bottom decreases significantly, and the maximum bending moment section of the cap changes from the side of wall to the middle of span. The loads of pile increase gradually,while the loads of bottom soil for waterproof slab and cap decrease gradually in layer-by-layer construction, and the trends of increasing or decreasing gradually slow down. The ability of the superstructure stiffness to restrain the differential settlement of foundation is limit, and the maximum bending moment of cap increases after considering layer-by-layer construction, the maximum bending moment of waterproof slab column decreases, and the bending moment of mid-span slab is always small and almost unchanged.

References:

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Last Update: 2019-03-27