Comparative Study on Mechanical Behavior of Bamboo-Concrete Connections and Wood-Concrete Connections

Zhiyuan Wang,Yang Wei,Junfeng Jiang,Kang Zhao,Kaiqi Zheng

doi:10.3389/fmats.2020.587580

Abstract

To investigate the similarities and differences of mechanical behavior between the bamboo-concrete connections and the wood-concrete connections, thirty-six specimens were tested through push-out tests with the material type (bamboo or wood), concrete strength and dowel diameter as test parameters. In addition to the linear variable displacement transducer (LVDT), the digital image correlation (DIC) was also used to obtain the slip distribution of the whole field of the specimens, which was conducive to the further detailed analysis of the slip distribution and a comprehensive understanding of the load-slip relationship. The results showed that the failure modes of the bamboo-concrete connections were similar to that of the wood-concrete connections, such as the concrete failure near the joint and the dowels bending in different degrees. The load-slip curves of the two kinds of connections were similar, which could be summarized as the elastic section, strengthening section and descending section. The shear stiffness and capacity of bamboo-concrete connections were higher than that of wood-concrete connections, and the shear capacity increased with the increase of dowel diameter and concrete strength. The slip distribution of the left and right sides of the specimen was basically identical. The load-transfer performance of the dowel was excellent. Finally, the prediction method of shear capacity and load-slip curve model of composite connections were proposed and verified to be effective.

Highlights

The bamboo/wood-concrete composite system usually consist of a bamboo/wood part in the tensile zone, a concrete layer in the compressive zone, and a connection between bamboo/wood and concrete
The results indicated that two connections showed a remarkable bearing capacity and the ductility of the perforated plate shear connections was larger
Bamboo and Wood Bamboo scrimber used in this test is made up of bamboo fibers that had been dried, impregnated, and pressed under high pressure and high temperature conditions

Summary

Introduction

The bamboo/wood-concrete composite system usually consist of a bamboo/wood part in the tensile zone, a concrete layer in the compressive zone, and a connection between bamboo/wood and concrete. Because of the low density and renewability of bamboo/wood, bamboo/woodconcrete composite system show several advantages over reinforced concrete structures, including better efficiency in terms of strength to self-weight ratio, and better seismic and environmental friendly performance (Shan et al, 2020). The wood supply in many areas is insufficient, so it is necessary to find a renewable material with excellent mechanical properties to Bamboo/Wood-Concrete Composite System replace wood. Xu et al (2017), Cui et al (2018) tested the tensile properties at elevated temperatures and thermal performance of bamboo scrimber. It could be found from the current research results that the bamboo scrimber could meet the requirements of structural materials

Methods

Results

Conclusion