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引言钢筋混凝土结构的实际受力情况,往往是弯、剪、扭的共同工作。《规范》(TJ10-74)对于受到组合外力的钢筋混凝土构件,曾提出按弯、剪、扭分别计算并线性叠加的方法。在工程实践中,虽然使用简便,但存在不少问题,例如: 忽略了弯、剪、扭的相互影响,仅当扭弯比ψ为0.3左右较符合实际。大于0.3时计算扭矩值严重偏低,简单叠加,可能降低结构的安全度。而预应力构件提高了截面抗扭强度这一事实,也进一步说明简单叠加将导致箍筋的浪费。
Introduction The actual stress of reinforced concrete structures is often the joint work of bending, shearing and twisting. The “Specification” (TJ10-74) has proposed a method for calculating and superimposing linearly over curved concrete, shear, and twist, respectively, for reinforced concrete members subject to combined external forces. In engineering practice, although it is easy to use, there are many problems, such as: Ignoring the mutual influence of bending, shearing, and twisting, it is more realistic than when the twisting and bending ratio is about 0.3. When the value is greater than 0.3, the calculated torque value is seriously low and simple superposition may reduce the safety of the structure. The fact that prestressed members increase the torsional strength of the cross-section also further demonstrates that simple superposition will result in waste of stirrups.