Extensive research has been conducted on the uniaxial tensile and compressive behavior of engineered cementitious composites. Despite the high tensile ductility and high toughness of engineered cementitious composites, transverse steel reinforcement is still necessary for high-performance structural members made of engineered cementitious composites. However, very limited research has been concerned with the compressive behavior of steel-confined engineered cementitious composites. This article presents the results of axial compression tests on a series of circular engineered cementitious composite columns confined with steel spirals. The test variables included the engineered cementitious composite compressive strength, the spiral pitch, and the spiral yield stress. The test results show that steel-confined engineered cementitious composites in the test columns exhibited a very ductile behavior; the steel spiral confinement contributed effectively to the enhancement of both strength and ductility of engineered cementitious composites. The test results were then interpreted by comparing them with the predictions from some existing models. It was found that the existing models previously developed for confined concrete failed to predict the compressive strength of steel-confined engineered cementitious composites with sufficient accuracy. New fitting equations for the compressive properties of steel-confined engineered cementitious composites were then obtained on the basis of the test results of this study as well as those from an existing study.

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钢螺旋约束工程水泥基复合材料在圆柱中的压缩行为

已经对工程水泥基复合材料的单轴拉伸和压缩行为进行了广泛的研究。尽管工程水泥基复合材料具有高拉伸延展性和高韧性，但由工程水泥基复合材料制成的高性能结构构件仍然需要横向钢筋。然而，关于钢约束工程水泥基复合材料的压缩行为的研究非常有限。本文介绍了一系列用钢螺旋约束的圆形工程水泥基复合柱的轴压试验结果。测试变量包括工程水泥基复合材料的抗压强度、螺旋节距和螺旋屈服应力。试验结果表明，试验柱中的钢约束工程水泥基复合材料表现出非常好的延展性；钢螺旋约束有效地提高了工程水泥基复合材料的强度和延展性。然后通过将测试结果与一些现有模型的预测进行比较来解释测试结果。结果发现，先前为受限混凝土开发的现有模型未能足够准确地预测钢约束工程水泥基复合材料的抗压强度。然后，基于本研究的测试结果以及现有研究的结果，获得了用于钢约束工程水泥基复合材料压缩性能的新拟合方程。钢螺旋约束有效地提高了工程水泥基复合材料的强度和延展性。然后通过将测试结果与一些现有模型的预测进行比较来解释测试结果。结果发现，先前为约束混凝土开发的现有模型未能足够准确地预测钢约束工程水泥基复合材料的抗压强度。然后，基于本研究的测试结果以及现有研究的结果，获得了用于钢约束工程水泥基复合材料压缩性能的新拟合方程。钢螺旋约束有效地提高了工程水泥基复合材料的强度和延展性。然后通过将测试结果与一些现有模型的预测进行比较来解释测试结果。结果发现，先前为受限混凝土开发的现有模型未能足够准确地预测钢约束工程水泥基复合材料的抗压强度。然后，基于本研究的测试结果以及现有研究的结果，获得了用于钢约束工程水泥基复合材料压缩性能的新拟合方程。然后通过将测试结果与一些现有模型的预测进行比较来解释测试结果。结果发现，先前为受限混凝土开发的现有模型未能足够准确地预测钢约束工程水泥基复合材料的抗压强度。然后，基于本研究的测试结果以及现有研究的结果，获得了用于钢约束工程水泥基复合材料压缩性能的新拟合方程。然后通过将测试结果与一些现有模型的预测进行比较来解释测试结果。结果发现，先前为受限混凝土开发的现有模型未能足够准确地预测钢约束工程水泥基复合材料的抗压强度。然后，基于本研究的测试结果以及现有研究的结果，获得了用于钢约束工程水泥基复合材料压缩性能的新拟合方程。