高强混凝土纯扭构件强度、刚度研究

通过24根矩形截面高强混凝土构件的纯扭拭验，表明高强混凝土纯扭构件的破坏机理与普通混凝土构件相似．但其脆性特征更明显，钢筋应力不均匀性也较大．本文建立了高强混凝土构件开裂扭矩，极限扭矩及抗扭刚度计算公式，计算值与实测值吻合良好．文中还证明软化空间桁架理论适用于高强混凝土纯扭构件的计算分析．

Study on the Strength and Rigidity of High-Strength Concrete Members under Pure Torsion

Based on the tests of 24 high--strength concrete members, the failure mechanism of high-strength concrete member under pure torsion was found to be about the same as that of the ordinary concrete one, but the brittle character of the former was more evident than that of the later, and the stress nonuniformity of steel in the former was larger than that in the later. The formulas for calculating the cracking torque, the ultimate torque and the torsion ri- gidity of high--strength concrete member have been established and the calculating value is quite corresponding to the testing value. Finally, the space truss theory considering the soft- ening effect of the concrete has been confirmed to be adequate to the analysis of the high-strength concrete member under pure torsion.