|Table of Contents|

Mechanical behavior and verification of horizontal through-hole hoisting of precast concrete pavement slab(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年1期
Page:
30-38
Research Field:
道路工程
Publishing date:

Info

Title:
Mechanical behavior and verification of horizontal through-hole hoisting of precast concrete pavement slab
Author(s):
KE Wen-hui1;  ZHOU Ran2;  FANG Ming-jing2;  CHEN Yi-ming2;  WANG Xiao2
(1. Wuhan Municipal Construction Group Co., Ltd., Wuhan 430023, Hubei, China; 2. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China)
Keywords:
road engineering;  prefabricated pavement;  precast concrete slab;  hoisting;  mechanical behavior;  numerical analysis;  test verification
PACS:
U416.216
DOI:
10.19721/j.cnki.1671-8879.2023.01.004
Abstract:
Because of the problems that the traditional embedded hanger cannot be well met by the geometric continuity and reusable of the prefabricated concrete pavement, a new type of through-hole hoisting method, namely the horizontal extended steel grid method was proposed to hoist the pavement slabs. The feasibility of this method was verified by the strain response of different reinforced concrete pavement slabs. The finite element analysis program ABAQUS and the test data were used to establish and verify the three-dimensional(3D)numerical model of the slab, respectively, and the mechanical behavior of horizontal through-hole hoisting for precast concrete slabs was analyzed. The results show that when the concrete slab with the size of 3.5 m(length)×3 m(width)×0.22 m(height)is hoisted with four-point through holes, the reinforcement ratios of hoisting direction and vertical hoisting direction decreased from 0.409% and 0.292% to 0.221% and 0.189%(ultimate reinforcement), respectively, results in about 30×10-6 strains generated at the bottom and top of the slab under the action of self-weight load and normal hosting speed. The pavement slab concrete during the whole hoisting process is in the elastic deformation stage without cracking. The slab’s inner stress caused by the through-hole hoisting is positively correlated with the hoisting distance and the slab size, and the stress concentration of concrete and steel bars at the lifting point is significant. To prevent stress concentration-induced concrete cracking, the locally densified steel mesh in the stress concentration area and the thicker steel bar(such as diameter of rebar is Φ28)as the main reinforcement for hoisting are recommended to reduce the concentrated stress at the occlusion part of the steel bar and concrete. Meanwhile, the long side of the slab as the hoisting edge and lifting distance less than 4.0 m are also preferentially encouraged. Moreover, if necessary to reduce the reinforcement of the slab when adopting the through-hole hoisting method, the rebar in the vertical hoisting direction is preferentially considered first. This research provides a reference for the structural dimensions design, rebar arrangement, and lifting point layout of prefabricated pavement slabs and similar precast concrete components using the through-hole horizontal hoisting method.2 tabs, 13 figs, 22 refs.

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Last Update: 2023-01-30