- 學位論文
偏心梁柱接頭之剪力強度預測
Shear Strength Prediction of Eccentric Beam-Column Joints Using Softened Strut-and-Tie Model
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並列摘要
Several studies showed that the eccentricity between beam and column connections has a detrimental effect on the joint shear strength. With regard to this issue, current ACI 318-08 code restricts the average shear stress on a horizontal plane within the joint, which equals to the effective joint width times column depth. The formula of effective joint width given in ACI 318-08 may be too conservative for eccentric beam-column joints. This thesis suggests a more rational formula of effective joint width associated with the softened strut-and-tie (SST) model for eccentric beam-column joints. Using the proposed effective joint width, the shear strength predictions of SST model agreed well with the results of 18 eccentric joint specimens failed in shear. Several available definitions of effective joint width are also used together with proposed effective joint width to estimate joint shear strength using the average joint shear stress limits given in ACI 318-08 design equation. This combination was successfully verified with available 126 beam-column joints with or without eccentricity in literature. Analysis shows that proposed effective joint width can well predict joint shear strength of eccentrically connected beam-column joints and preserves the accuracy of current adopted effective joint width in ACI 318-08. Furthermore, some sensitivity analysis are performed to justify several assumptions.
參考文獻
1. Abrams, D. P., “Scale Relations for Reinforced Concrete Beam-Column Joints,” ACI Structural Journal, V. 84, No. 6, November-December 1987, pp. 502-512.
2. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (318R-05),” American Concrete Institute, Farmington Hills, Mich., 2005, 430 pp.
3. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary (318R-08),” American Concrete Institute, Farmington Hills, Mich., 2008, 465 pp.
5. Architectural Institute of Japan (AIJ) “ Design Guidelines for Earthquake Resistant Reinforced Concrete Buildings Based on Inelastic Displacement Concept,” Architectural Institute of Japan, Tokyo, 1999. (in Japanese)
6. Au, F. T. K., Huang, K., Pam, H. J., “Diagonally-Reinforced Beam-Column Joints Reinforced under Cyclic Loading,” Proceedings of The Institution of Civil Engineers, Paper 13310, February 2005, pp. 21-40.