| Summary: | 碩士 === 中華技術學院 === 土木防災工程研究所 === 97 === The objective of this research is to explore the failure of shear resistance in the reinforced concrete deep beams stemming from diagonal compression force flow. The methodology in the exploration adopted reinforced concrete design code 401-86a, which using an empirical formulation, a revised version of reinforced concrete design code 401-93, Huang-Lee simplified softened strut-and-tie model, and an innovative model proposed in this study.
Hwang-Lee simplified softened strut-and-tie model is implemented to estimate shear strength in the discontinued zone and the versatility of this model can accuracy predict the shear strength of reinforced concrete with less variant and more reliable in comparison with other approaches.
A simplified truss model is an alternative and innovative approach to calculate the shear strength and achieves an identical result as the flexural formulation with less calculation efforts.
The derivation of this model is on the basis of 148 experiment data of deep beams. This derivation is incorporated with high strength, normal strength and with plain concrete or with rebar to identify their variation. The feasibility of ACI strut model, SST-flexural model, and SST-truss model is investigated. ACI empirical formulation exhibits an overestimate result, and other two models provide more reliable prediction.
Key word:Deep Beams、Shear Strength、Softened strut-and-tie model、Discontinued region
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