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首页> 外文期刊>International Journal of Civil Engineering,Transaction A:Civil Engineering >Response Characteristics of a Steel Fiber-Reinforced Porosity-Free Concrete Beam Under an Impact Load
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Response Characteristics of a Steel Fiber-Reinforced Porosity-Free Concrete Beam Under an Impact Load

机译：冲击载荷作用下钢纤维增强无孔混凝土梁的响应特性

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摘要

The utilization of ultra-high-strength concrete offers a weight reduction of concrete structures and improvements in disaster protection performance. Recently, porosity-free concrete (PFC) having the world's highest compressive strength of 400 MPa has been developed, and its basic mechanical properties were determined; however, its impact-resistant capacity is yet to be examined. In this study, investigation of the impact resistance behavior of PFC is performed using a weight dropping impact test on a fiber-reinforced PFC beam. Steel fiber-reinforced PFC is used for preventing brittle failure, and the full plastic moment of the PFC beam cross-section is determined based on material test results. Also, the estimation of maximum response deflection is attempted by a simple plastic analysis. It was demonstrated that the response deflection could be reduced by 30-50% by increasing the steel fiber mixing rate in the PFC beam from 1 to 2%. The proposed estimation method revealed that the response deflection of the PFC beam could be estimated with an accuracy of approximately 80% considering the calculated full plastic moment when the plastic hinge is clearly formed. In the future, to establish a design procedure for the impact-resistant capacity of protective structures from steel fiber-reinforced PFC, it is necessary to conduct experimental and numerical research focusing on ultimate strength, including statistical processing.
机译：超高强度混凝土的使用减轻了混凝土结构的重量，并提高了防灾性能。最近，已经开发了具有世界最高抗压强度400 MPa的无孔混凝土（PFC），并确定了其基本力学性能;但是，其抗冲击能力尚待检验。在这项研究中，PFC的抗冲击性能的研究是通过对纤维增强的PFC梁进行落锤冲击试验来进行的。钢纤维增强的PFC用于防止脆性破坏，并根据材料测试结果确定PFC梁截面的全塑性矩。同样，通过简单的塑性分析尝试估计最大响应挠度。结果表明，通过将PFC梁中钢纤维的混合率从1％增至2％，可以将响应挠度降低30-50％。所提出的估计方法表明，考虑到清楚形成塑料铰链时所计算出的全塑性力矩，可以以大约80％的精度估计PFC梁的响应挠度。将来，要建立钢纤维增强PFC防护结构的抗冲击能力设计程序，有必要进行针对极限强度的实验和数值研究，包括统计处理。

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