The mechanical behavior of RPC under combined shear and compressive loads
The mechanical behavior of RPC under combined shear and compressive loads
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DOI：
10.1016/j.cemconcomp.2021.104071
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发表时间：
2021-04
影响因子：
10.5
通讯作者：
Le Shen;M. Ding;Kang Chen;Chen Feng;Bo Yang;M. Elchalakani
中科院分区：
文献类型：
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作者：
Le Shen;M. Ding;Kang Chen;Chen Feng;Bo Yang;M. Elchalakani
本研究通过立方体试件的直剪试验，研究了活性粉末混凝土（RPC）在剪切强度和剪切滑移方面的剪切行为，并研究了水胶比、钢纤维体积比和法向压应力比的影响。试验结果表明，采用较低的水胶比和合理的纤维含量可以提高RPC试件的剪切强度。含有钢纤维的RPC试样不会由于钢纤维的连接而被切断成两个单独的部分。此外，正应力是剪切强度的关键贡献，残余剪切能力主要由剪切面的摩擦力提供。循环水平试验中试件的开裂现象更加严重，但与单调水平试验相比，剪切强度没有明显下降。将双剪统一强度理论应用到试验数据中，表明椭圆曲线表现出良好的一致性。因此，统一双剪强度理论可以预测压剪组合应力状态下合适的RPC强度包络曲线。
In this study, the shear behavior of reactive powder concrete (RPC) in terms of shear strength and shear slip was studied by direct shear tests on cubic specimens and the influences of water-binder ratio, steel fiber volume ratio and normal compressive stress ratio were investigated. The test results indicated that using a low water-binder ratio and a reasonable fiber content could enhance the shear strength of RPC specimens. The RPC specimen containing steel fiber will not be severed into two individual parts due to the connection of steel fiber. Moreover, the normal stress was the key contribution to the shear strength, and the residual shear capacity was mainly provided by the friction of the shear surface. The cracking of the specimens became more severe but the shear strength in the cyclic horizontal test did not decrease obviously compared with that in the monotonic horizontal test. Applying the twin-shear unified strength theory to the test data, it was indicated that the elliptic curve showed a good agreement. Therefore, the unified twin shear strength theory could predict the proper RPC strength envelope curve under combined compressive-shear stress states.