混凝土剪力墙平面外受弯性能试验研究

Experimental Study on out-of-Plane Bending Resistance of Concrete Shear Wall

剪力墙可能会受到土体压力、爆炸、撞击等作用导致平面外破坏。为研究用于混凝土剪力墙的平面外抗弯性能,设计了4种不同配筋率的剪力墙,采用四点加载方式对其进行平面外的抗弯试验,通过竖向荷载、构件挠度、裂缝的出现和开展等试验数据,对剪力墙平面外抗弯破坏的过程、延性、屈服和极限荷载进行分析。试验结果表明剪力墙在平面外受弯时虽然属于少筋破坏,但并非一裂就坏,混凝土开裂甚至钢筋屈服后仍有很大的变形能力。研究基于塑性铰理论给出了剪力墙的屈服和极限抗弯承载力计算公式。

Shear walls may be subjected to soil pressure,explosion,impact or other accidents,resulting in out-of-plane failure.Four concrete shear walls with different reinforcement ratios were designed,and four-point loading tests were performed to study the out-of-plane bending performance of the concrete shear walls.Data including the vertical load,specimen deflection,crack appearance and development were recorded,and out-of-plane bending failure process,displacement ductility,yield and ultimate load of the walls were analyzed.The test results show walls were not damaged with first crack and still had great out-of-plane deformability after the concrete cracked or even the steel bars yielded,although walls were designed with few steel bars.Based on the theory of plastic hinge,the formulas for the yield and ultimate moment resistance calculation of the walls were derived.