|Table of Contents|

Axial compression test and bearing capacity calculation of square columns composite strengthened with alkali-resistant fiberglass grid and polypropylene concrete(PDF)

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

Issue:
2023年03期
Page:
70-82
Research Field:
建筑结构
Publishing date:

Info

Title:
Axial compression test and bearing capacity calculation of square columns composite strengthened with alkali-resistant fiberglass grid and polypropylene concrete
Author(s):
HUANG Hailin1; 2;  GAO Yaqiang1;  XU Yongkui1;  CHEN Sicheng1;  ZHUANG Dawei3
(1. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China; 2. Hunan Engineering Research Center for Intelligently Prefabricated Passive House, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China; 3. Hunan Xiangguangtai Industrial Group Co., Ltd, Changsha 410000, Hunan, China)
Keywords:
alkali-resistant fiberglass grid;  polypropylene concrete;  square column;  axial compression test;  failure mechanism;  bearing capacity calculation
PACS:
TU746.3
DOI:
10.19815/j.jace.2021.10025
Abstract:
Through 16 square columns composite strengthened with alkali-resistant fiberglass grid and polypropylene concrete axial compression tests, the ultimate bearing capacity and failure modes of each specimen were obtained. The longitudinal compressive stress-strain curve in the middle of the concrete and the compressive stress-strain curve in the middle of the alkali-resistant fiberglass grid were measured. The influences of polypropylene fiber content in the reinforced layer concrete, alkali-resistant fiberglass grid wrapping mode and other parameters on the axial compression performance and failure mechanism of the specimen were analyzed. By introducing reasonable basic assumptions and strength models, the calculation method of axial compression bearing capacity of square columns strengthened with alkali-resistant fiberglass grid and polypropylene concrete was proposed. The theoretical calculation value obtained by the proposed calculation method and the calculation method in relevant literature was compared with the test results. The results show that the main failure mode of the specimen is longitudinal compression fracture. The cracks first appear in the corner area of the specimen and develop towards both ends. Some specimens have peeling phenomenon of the reinforcement layer. Compared with the alkali-resistant fiberglass grid interval wrapped test specimen, the fully wrapped test specimen shows better compression performance and ductility. With the increase of the content of polypropylene fiber in the reinforced concrete, the ultimate bearing capacity of the specimen first increases and then decreases. The theoretical calculation value obtained by the proposed calculation method is in good agreement with the test result, and the theoretical calculation value is less than the test value, indicating that the proposed formula has a certain safety reserve and can be used for reference in engineering design.

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Last Update: 2023-05-20