Stress Transfer Properties and Displacement Difference of GFRP Antifloating Anchor

Xiaoyu Bai,Yonghong Wang,Xueying Liu,Zheng Kuang,Nan Yan,Mingyi Zhang

doi:10.1155/2020/8894720

Xiaoyu Bai, Yonghong Wang + Show 4 more

Open Access

https://doi.org/10.1155/2020/8894720

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Abstract

Glass fiber reinforced polymer (GFRP) antifloating anchors are widely used in reinforcing underground structures. Despite the outstanding application advances of GFRP anchors in the antifloating field, research on the mechanical transmission and deformation properties of the anchor rod and anchorage body is still scarce. This paper introduces pull-out experiments of GFRP antifloating anchors based on the FBG sensor strings technology. The experimental data demonstrates that the distribution curve of the axial stress shows a reversed-S shape, and the shear stress distribution presents the law of increasing first and then decreasing from the position of peak shear stress. The rod-anchorage body displacement difference curves of the anchors with an anchorage length that is closer to the critical anchorage length are smoother than those of the anchors with a larger length difference from the critical anchorage length. Finally, a simplified distribution model of the shear stress is applied for predicting the rod-anchorage body displacement difference, and the experimental data of the anchors with a rod slip failure is more applicable for this model than that of the anchors with a rod rupture failure.

Highlights

Floating issues of the buildings have been widely noticed in areas with high groundwater level or wet-dry circulation
Based on the Fiber Bragg grating (FBG) sensor strings technology, pull-out experiments of glass fiber reinforced polymers (FRP) (GFRP) antifloating anchors were conducted, and significant data were collected such as failure load, distributions of axial stress and shear stress, and displacements of the rod and anchorage body
On the basis of these data, the following conclusions could be drawn: (1) Improving the anchorage length continuously is ineffective in promoting the pull-out capacity of the GFRP anchors, but improving the rod diameter is useful for the pull-out capacity improvement

Summary

Introduction

Floating issues of the buildings have been widely noticed in areas with high groundwater level or wet-dry circulation. In the literature [1], Kou et al conducted an in-site pull-out test of the GFRP anchors with a single rod and found similar stress distribution rules compared with the research of [16]. Mechanical properties of the interface between anchorage body and surrounding soil is still rare, and a test database is required for better understanding the stress distribution rules at the anchorage body-surrounding soil interface Another significant aspect is the stress transfer rules through the anchorage body, which is beneficial in providing a valuable reference to its design. Apart from the stress distribution and transfer issue, the anchor displacement is a serious concern Regarding this aspect, scholars mainly study the displacement of the anchor rod separately but ignore the displacement of the anchorage body [17,18,19]. A prediction model for the displacement difference, derived by the simplified distribution model for the shear stress, is presented. e research works provide the experimental and theoretical basis for the further application of GFRP antifloating anchor

Concept Explanation

Monitoring Principle

Experimental Program

Construction of GFRP Antifloating Anchors

Experimental Results and Discussion

Conclusions