Fracture Behavior of RC Members Subjected to Torsion-Bending Shear Using the Acoustic Emission Method

钢筋混凝土构件在扭转-弯曲剪切(复合截面力)作用下，一侧出现局部裂缝，反面出现小裂缝。此外，如果钢筋混凝土构件受到复合截面力，则钢筋混凝土构件有可能迅速断裂。为此，采用声发射方法对钢筋混凝土构件的内部断裂行为、内部断裂能和开裂位置进行了研究。对于纯扭转加载的钢筋混凝土构件的内部断裂，断裂只在横截面的外周进行，直到腹板钢筋屈服。在达到最大强度的1/3之前，纯扭转断裂和弯曲剪切断裂是控制复合截面受力构件内部断裂的主要因素。

When the RC members were loaded by torsion-bending shear (composite sectional force), local cracks were found on one side while minor cracks were found on the opposite side. Also, if the RC members received composite sectional force, it is possible that the RC member would rapidly be broken. Therefore, the AE (acoustic emission) method was used to clarify the internal fracture behavior, internal fracture energy, and locations of cracking in RC members. For internal fractures in RC members loaded by pure torsion, the fractures progressed only in the outer circumference of the cross section until the web reinforcement yielded. Moreover, the pure torsion fracture and the bending shear fracture were the primary factors in controlling the internal fractures of RC members loaded by composite sectional force, before they reached one-third of the maximum strength.