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Experimental study on the effects of bi-directional loading pattern on rectangular reinforced concrete walls

机译：双向装载图案对矩形钢筋混凝土墙体影响的实验研究

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摘要

In this experimental study, three identical reinforced concrete (RC) walls were tested under three different lateral loading patterns. These loading patterns were cyclic in-plane, skewed with 45 degrees angle and clover leaf. The main objective was to investigate the effects of these bi-directional loading patterns on the seismic behavior of slender rectangular RC walls. The results showed significant increase in tensile and compressive strains in concrete and longitudinal bars that led to earlier cover concrete spalling and bar buckling in the specimens subjected to bi-directional loading. The neutral axis depth and compression zone were found to be substantially larger when subjected to bi-directional loading and this led to the occurrence of concrete crushing and bar buckling in the web. Moreover, lateral instability failure triggered earlier in the specimens under bi-directional loading, as a result of reduction of out-of-plane stiffness of the wall. However, bi-directional loading did not significantly increase out-of-plane buckling of the wall in terms of out-of-plane displacement. In-plane and out-of-plane shear cracks formed in one of the specimens subjected to bi-directional loading, whereas the same wall under in-plane loading developed only flexural cracks. It was also found that in-plane shear deformation was larger when the wall was subjected to bi-directional loading. The results of this experimental study emphasize the need for further investigation of the effects of bi-directional loading on RC structural walls.
机译：在该实验研究中，在三种不同的侧向装载模式下测试了三个相同的钢筋混凝土（RC）壁。这些装载模式是循环的平面内，偏斜45度角和三叶草叶。主要目的是研究这些双向装载模式对细长矩形RC壁的地震行为的影响。结果表明，混凝土和纵向杆中的拉伸和压缩菌株的显着增加，其导致较早的覆盖混凝土剥落和在经过双向载荷的试样中的杆屈曲。发现中性轴深度和压缩区在进行双向负载时基本上更大，并且这导致幅材中的混凝土压碎和杆状的发生。此外，由于壁的外平面刚度降低，双向负载下的试样上触发的横向不稳定故障。然而，就平面外位移而言，双向负载没有显着增加墙壁的平面屈曲。在经过双向载荷的一个样本中形成的平面内和平面外剪切裂缝，而在面内载荷下的相同壁仅产生弯曲裂缝。还发现，当壁进行双向载荷时，面内剪切变形更大。该实验研究的结果强调需要进一步调查双向负载对RC结构壁的影响。

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