|Table of Contents|

Experiment on Ultimate Bearing Capacity of Self-balancing Cross Beam Foundation with Single Pile in Narrow-base Tower(PDF)

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

Issue:
2021年03期
Page:
30-42
Research Field:
Publishing date:

Info

Title:
Experiment on Ultimate Bearing Capacity of Self-balancing Cross Beam Foundation with Single Pile in Narrow-base Tower
Author(s):
ZHENG Xiang-feng1;  YANG Chui-wei1;  ZHAO Teng-fei2;  HUANG Mo-jia3
(1. China Energy Engineering Group Anhui Electric Power Design Institute Co., Ltd., Hefei 230601, Anhui, China; 2. College of City Construction, Jiangxi Normal University, Nanchang 330022, Jiangxi, China; 3. Department of Engineering Mechanics, Nanchang University, Nanchang 330031, Jiangxi, China)
Keywords:
narrow-base tower;  single pile;  cross beam;  new foundation;  full scale test;  nonlinear analysis
PACS:
TU323
DOI:
10.19815/j.jace.2020.04001
Abstract:
A new type of narrow base tower foundation(self-balancing cross beam foundation with single pile)with simple structure, good overall performance, fast construction and appropriate economic benefit was proposed. Based on full-scale test and numerical simulation, the mechanical characteristics and failure mode of the new foundation were studied. The nonlinear finite element model of soil-concrete-reinforcement was established. Considering the nonlinear contact between soil and concrete, the load-unload analysis of the model was carried out, and the results were compared with the test results. Through the analysis, the ultimate bearing capacity of the new foundation was obtained, and the failure form, the weak position and the reinforcement stress of the new foundation under the load were obtained. The results show that the load-displacement curve of the finite element model, the change curve of the axial force of the main reinforcement and crack development of the cross beam foundation are in good agreement with the test results. The load-displacement curve is basically of slow change or linear. The axial force of the main reinforcement of the cross beam has the maximum tensile stress at the position about 0.5 m from the bottom of the cross beam on the uplift side. There is a maximum compressive stress at the interface between the cross beam and the pile on the compression side. The maximum tensile stress of the main reinforcement of single pile is about 1.95 m away from the pile top, and the maximum compressive stress is about 0.94 m away from the pile top. The cracks of the cross beam begin to develop from the lower side of the cross beam root, the tensile reinforcement yields, and the concrete in the compression zone is damaged. The research can provide the basis for the design of the new foundation.

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Last Update: 2021-05-20