Design Formulas for Cracking Torque and Twist in Hollow Reinforced Concrete Members

作者：Jeng Chyuan Hwan^*; Chiu Hao Jan; Peng Sheng Fu

来源：ACI Structural Journal, 2013, 110(3): 457-467.

• cracking angle of twist
• cracking torque
• design formula
• hollow
• reinforced concrete
• softened membrane model
• torsion

Hollow concrete members are in wide use and are becoming increasingly important in terms of energy savings and carbon reduction. To date, the prediction of cracking torque in hollow reinforced concrete (RC) members still relies on simplistic empirical formulas, and the accuracy of the existing formulas is rarely examined. In this study, four existing formulas are used to calculate the cracking torques T-cr and twists theta(cr) of 44 hollow RC beam specimens currently available in the literature. An existing empirical formula for T-cr is modified to fit the test values. Based on the latest rational formula for solid members, a new formula for the T-cr and theta(cr) of hollow RC members is developed to form a unified formula for solid and hollow sections. The predicting accuracies of these formulas are compared and evaluated. It is shown that the proposed formulas produce significantly more accurate and reliable predictions than the existing formulas.

• 出版日期2013-6