Structural performance of a façade precast concrete sandwich panel enabled by a bar-type basalt fiber-reinforced polymer connector

doi:10.1007/s11709-022-0894-1

Front. Struct. Civ. Eng.

2023, Vol. 17

Issue (1) : 122-137 https://doi.org/10.1007/s11709-022-0894-1

RESEARCH ARTICLE

Structural performance of a façade precast concrete sandwich panel enabled by a bar-type basalt fiber-reinforced polymer connector

Junqi HUANG^1,², Qing JIANG^1,²(

), Xun CHONG^1,², Xianguo YE^1,², Caihua LIU¹

¹. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China
². Anhui Civil Engineering Structures and Materials Laboratory, Hefei 230009, China

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Abstract

In this study, a novel diagonally inserted bar-type basalt fiber reinforced polymer (BFRP) connector was proposed, aiming to achieve both construction convenience and partially composite behavior in precast concrete sandwich panels (PCSPs). First, pull-out tests were conducted to evaluate the anchoring performance of the connector in concrete after exposure to different temperatures. Thereafter, direct shear tests were conducted to investigate the shear performance of the connector. After the test on the individual performance of the connector, five façade PCSP specimens with the bar-type BFRP connector were fabricated, and the out-of-plane flexural performance was tested under a uniformly distributed load. The investigating parameters included the panel length, opening condition, and boundary condition. The results obtained in this study primarily indicated that 1) the bar-type BFRP connector can achieve a reliable anchorage system in concrete; 2) the bar-type BFRP connector can offer sufficient stiffness and capacity to achieve a partially composite PCSP; 3) the boundary condition of the panel considerably influenced the out-of-plane flexural performance and composite action of the investigated façade PCSP.

Keywords precast concrete sandwich panel basalt fiber reinforced polymer pull-out performance shear performance out-of-plane flexural performance

Corresponding Author(s): Qing JIANG

About author:

Changjian Wang and Zhiying Yang contributed equally to this work.

Just Accepted Date: 28 October 2022 Online First Date: 13 January 2023 Issue Date: 02 March 2023

Cite this article:

Junqi HUANG,Qing JIANG,Xun CHONG, et al. Structural performance of a façade precast concrete sandwich panel enabled by a bar-type basalt fiber-reinforced polymer connector[J]. Front. Struct. Civ. Eng., 2023, 17(1): 122-137.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-022-0894-1
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I1/122

Fig.1 Fa?ade PCSP and the proposed connector.

Tab.1 Material properties of the steel rebar and BFRP connector used in this study

Fig.2 Pull-out test of the connector: (a) dimensions of the specimen (unit: mm); (b) ST-B20 specimens; (c) ST-0 specimens; (d) ST-25 specimens; (e) ST-40 specimens; (f) ST-60 specimens; (g) shape of the curves and failure mode; (h) relationship between pull-out capacity and temperature.

Tab.2 Pull-out capacities of the test specimens

Fig.3 Direct shear test of the specimen: (a) test specimen and failure mode; (b) shear force–relative slip relationship.

Fig.4 Fabrication process of the PCSP specimens in this study: (a) installing the bottom layer reinforcement; (b) pouring bottom layer concrete; (c) installing the XPS insulation, connector, and top layer reinforcement; (d) pouring top layer concrete.

Fig.5 Details of the flexural test setup: (a) details of the test setup; (b) boundary condition of the flexural test specimen; (c) photo of the test setup.

Tab.3 Details of the flexural test PCSP specimens

Fig.6 Geometrical dimensions of the SP specimens (unit: mm): (a) SP-4980-0-2 and SP-4980-0-3; (b) SP-6280-2-3; (c) SP-8020-2-3 and SP-8020-2-4.

Fig.7 Crack pattern of the test specimens: (a) SP-4980-0-2; (b) SP-4980-0-3; (c) SP-6280-2-3; (d) SP-8020-2-3; (e) SP-8020-2-4.

Fig.8 Load–deflection relationship of the PCSP specimens: (a) SP-4980-0-2; (b) SP-4980-0-3; (c) SP-6280-2-3; (d) SP-8020-2-3; (e) SP-8020-2-4; (f) comparison between different specimens.

Fig.9 Load–strain relationship of the specimens.

Tab.4 Cracking load, initial curve slope, and degree of composite action of the specimens

Fig.10 FE model and the analysis result: (a) comparison of the test and FE results in Ref. [12]; (b) FE model of the FC counterpart of SP-6280-2-3 (wind load = 1 kN/m²). (Reprinted from Magazine of Concrete Research, 72(3), Huang J, Jiang Q, Chong X, Ye X, Wang D, Experimental study on precast concrete sandwich panel with cross-shaped GFRP connectors, 149–162, Copyright 2020, with permission from ICE Publishing.)

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