RESEARTH ON MECHANICAL PROPERTIES OF STEEL-BAMBOO COMPOSITE I-BEAMS AFTER BEING SUBJECTED TO LONG-TERM LOADING

WANG Jialin; LI Yushun; ZHOU Jiaru; YAN Zhimin

doi:10.13204/j.gyjzG201906150004

Volume 50 Issue 8

Oct. 2020

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WANG Jialin, LI Yushun, ZHOU Jiaru, YAN Zhimin. RESEARTH ON MECHANICAL PROPERTIES OF STEEL-BAMBOO COMPOSITE I-BEAMS AFTER BEING SUBJECTED TO LONG-TERM LOADING[J]. INDUSTRIAL CONSTRUCTION, 2020, 50(8): 160-165,181. doi: 10.13204/j.gyjzG201906150004

Citation:

WANG Jialin, LI Yushun, ZHOU Jiaru, YAN Zhimin. RESEARTH ON MECHANICAL PROPERTIES OF STEEL-BAMBOO COMPOSITE I-BEAMS AFTER BEING SUBJECTED TO LONG-TERM LOADING[J]. INDUSTRIAL CONSTRUCTION, 2020, 50(8): 160-165,181. doi: 10.13204/j.gyjzG201906150004

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RESEARTH ON MECHANICAL PROPERTIES OF STEEL-BAMBOO COMPOSITE I-BEAMS AFTER BEING SUBJECTED TO LONG-TERM LOADING

doi: 10.13204/j.gyjzG201906150004

School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China

Received Date: 2020-03-16

Abstract

Abstract

In order to explore the mechanical properties of steel-bamboo composite I-beam after being subjected to long-term loading, eight steel-bamboo composite I-beam specimens were designed and fabricated with the parameters of bamboo plate thickness, steel plate thickness and width, and section height. Four of them were long-term loaded specimens. After being subjected to long-term loading, secondary loading failure tests were carried out. The other four were short-term loaded specimens, and loading failure tests were carried out directly for comparison. The long-term and short-term loaded specimens were analyzed, and the failure characteristics, failure modes and failure loads were compared. The load-strain relationship, load-deflection relationship and bearing capacity attenuation of steel-bamboo composite I-beams were studied. The calculation method of bearing capacity and deflection of steel-bamboo composite I-beams after being subjected to long-term loading was discussed. The test results showed that the steel-bamboo composite I-beams still had good mechanical properties after being subjected to long-term loading. Long-term load had no effect on the ultimate failure mode of steel-bamboo composite I-beams. The secondary loading failure and direct loading failure of composite beams had four stages of elasticity, yield, cracking and ultimate strength. The flexural deformation of long-term loaded specimens was little different from that of short-term loaded specimens. Increasing the thickness, width and section height of bamboo plate could improve the ultimate bearing capacity of long-term loaded specimens. The bearing capacity of long-term loaded specimens decreased by about 10%. This paper calculated the bearing capacity and deflection of steel-bamboo composite I-beams after being subjected to long-term loading by using the proposed formula, and the theoretical value was in good agreement with the experimental value.
- steel-bamboo composite beams,
- long-term loading,
- destructive test,
- bearing capacity degradation,
- deflection deformation

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