Bond Strength of Mortar-filled Steel Pipe Splices Reflecting Confining Effect

作者：Kim Hyong Kee^*

来源：Journal of Asian Architecture and Building Engineering, 2012, 11(1): 125-132.

DOI：10.3130/jaabe.11.125

• steel pipe sleeve
• mortar-filled
• reinforcing bar splices
• confining effect
• bond strength

This study purposed to evaluate the adequacy of existing equations proposed for calculating the bond strength of reinforcing bar splices in a mortar-filled steel pipe sleeve, and to propose a method for estimating the bond strength of bar splices that quantitatively reflects the confining effect of a steel pipe sleeve. For this purpose, we analyzed a total of 40 experimental mortar-filled steel pipe splices in which bond failure occurred, and examined how the confinement effect of steel pipe affects the bond performance of these splices. %26lt;br%26gt;The study results showed that existing methods of estimating the bond strength of the bar splices did not adequately estimate the bond strength of reinforcement splices in a mortar-filled steel pipe sleeve. In addition, based on the results of the tests on the 40 analyzed specimens, we performed multiple regression analysis with independent variables such as sleeve shape and the development length of a bar, and proposed the confining pressure of mortar-filled steel pipe splices. By applying the proposed confining pressure to Untrauer and Henry%26apos;s bond strength equation reflecting the lateral confining pressure, we computed the bond strength of mortar-filled steel pipe splices more accurately than existing bond strength estimation methods.

• 出版日期2012