|Table of Contents|

Experiment on Performance of SRPE Pipe Confined Concrete Circular Stub Columns Under Axial Compression(PDF)

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

Issue:
2021年04期
Page:
13-23
Research Field:
Publishing date:

Info

Title:
Experiment on Performance of SRPE Pipe Confined Concrete Circular Stub Columns Under Axial Compression
Author(s):
GAO Jian-ping1; 2;  HAO Ti1;  HUO Jing-si3;  LIU Hong4
(1. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, Jiangxi, China; 2. National Experimental Teaching Demonstration Center of Civil Engineering, East China Jiaotong University, Nanchang 330013, Jiangxi, China; 3. College of Civil Engineering, Huaqiao University, Xiamen 361021, Fujian, China; 4. Anyuan Pipelines Industrial Co., Ltd., Pingxiang 337000, Jiangxi, China)
Keywords:
steel reinforced polyethylene plastic pipe;  confined concrete;  stub column;  axial compression test;  bearing capacity;  ductility
PACS:
TU599
DOI:
10.19815/j.jace.2020.10038
Abstract:
In order to solve the corrosion problem of reinforced concrete bridge piers and columns in saline soil area of Western China, a new type of composite structure “steel reinforced polyethylene plastic(SRPE)pipes casing confined concrete column” was proposed, which could completely isolate the pier from various corrosive ions. In order to study its axial compression performance, 12 specimens of SRPE pipe concrete stub columns and 3 specimens of plain concrete stub columns were tested under axial compression, and the influence of concrete strength grade, circumferential constrained stress and expansive agent on the failure form, load-displacement curve, ductility and initial stiffness of the specimens were analyzed. According to the calculation method of circumferential constrained stress of SRPE pipe and the calculation formula of compressive strength of confined concrete stub columns, the calculation method of axial compressive bearing capacity of SRPE pipe concrete stub columns was established. The results show that the ultimate failure mode of SRPE pipe confined concrete stub column is inclined shear failure of core concrete, and with the increase of SRPE pipe circumferential restraint stress, the shear deflection angle of the specimen decreases gradually; the higher the concrete strength grade of the specimens, the greater the peak load of load-displacement curve, the steeper the descending section, and the greater the brittleness of the specimens. SRPE pipe can significantly improve the bearing capacity, peak deformation, initial compression stiffness and ductility of the specimens, and with the increase of circumferential restraint stress of the SRPE pipe, the mechanical properties of the specimens show a trend of gradual increase. With the increase of concrete strength grade, the bearing capacity of specimens increases, but the peak deformation and ductility decrease. The addition of expansive agent(mass fraction of 10%)only reduces the bearing capacity of the specimen, but improves the peak deformation, initial compression stiffness and ductility of the specimen to some extent. The calculation method of axial compressive bearing capacity of pipe concrete short columns can provide reference for engineering practice.

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Last Update: 2021-07-10