Flexural behavior of prestressed composite beams with corrugated web: Part II. Experiment and verification
Introduction
The authors, in their previous study, proposed a prestressed composite beam with corrugated web that is advantageous for a long span and saving story height. The corrugated web utilized in the proposed composite beam enhances the efficiency of prestressing by making full use of the stress to the top and bottom flanges utilizing the accordion effect, and additional web stiffener is not required due to its great local and out-of plane buckling strength. The proposed composite beam with corrugated web has excellent performance on the composite action between concrete and steel beam, and provides good flexural rigidity and strength [1].
The authors, in their previous paper [1], proposed the concept of effective sectional area and effective moment of inertia to reflect the accordion effect that occurs on the steel beam with corrugated web before composite with concrete and also developed an analysis method on the behavior of the composite beam. While there have been some experimental researches on the externally prestressed composite beams [2], [3], [4], [5], [6], there has been no such study on the encased prestressed composite beam, which is presented in this study. Therefore, this paper, following the previous paper by the authors, presents experimental results on two encased prestressed composite beams with corrugated web and a non-prestressed composite beam, in which the effect of prestressing is analyzed and the proposed analysis method for the accordion effect and the flexural behavior of the composite beam are verified.
On the other hand, most of the composite beams in previous experimental researches [7], [8], [9] had a narrow flange width of the concrete slab and the top flange of the steel beam extended to the height of the center of the slab, resulting in the neutral axis being located lower than the top flange of the steel beam. However, the effective width of the actual T-shaped concrete section may be larger than that of previously studied specimens. In fact, in the construction site, it is quite common that the neutral axis locates in the slab due to the relatively wide effective width of slab. In such a case, it is possible to have a shear failure between slab and beam, which may occur before the composite beam reaches its ultimate flexural capacity. Therefore, this study also includes the analysis on the horizontal shear strength that reflects the actual failure mode observed in this experiment.
Section snippets
Experimental program
A total of three full-scaled specimens have been fabricated to evaluate the flexural strength and behavior of the prestressed composite beams with corrugated web. As shown in Table 1, two specimens, FPCE1 and FPCE2, were prestressed, whereas the specimen FNC was not. Fig. 1a and b shows the tendon profiles and geometry of the steel beam specimens before composite. The tendon was arranged in a way that a drape point was at the center of FPCE1 and two drape points were near the center of FPCE2.
Accordion effect
As reported in the authors’ previous paper [1] and existing studies [3], [12], [13], [14], [15], it is known that the prestress introduced to the top and bottom flanges increases because there is little stress introduced to corrugated web due to the accordion effect. Fig. 7 shows the strain distribution along the height of the section at midspan when the specimens FPCE1 and FPCE2 were prestressed. It can be observed that there is no or little strain on the corrugated web whereas the top and
Verification of the proposed analysis model
Authors, in their previous research, proposed an approach utilizing the concept of effective section for the analysis of the accordion effect by the corrugated web [1]. As concretized by the effective moment of inertia (Ieff) and the effective area (Aeff), the concept of effective section is expressed by:where Ig is the gross moment of inertia, Aflange is the sum of the sectional areas of the top and bottom flanges, and Aweb is the sectional area of web. ηf and ηa
Conclusion
In this study, a non-prestressed and two prestressed composite beams with corrugated web have been fabricated in full scale and experimental tests were conducted to examine their flexural behavior. In addition, the flexural behavior model, reflecting the accordion effect, proposed for the prestressed composite beam with corrugated web in the previous study, was verified. The study resulted in the following conclusions:
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The steel beam with corrugated web was very efficient to introduce larger
Acknowledgments
This work (Grants No. 00041190) was supported by Business for Cooperative R&D between Industry, Academy and Research Institute funded by the Korea Small and Medium business Administration in 2010.
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