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Design of high-strength concrete members: state-of-the-art

机译：高强度混凝土构件的设计：最新技术

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The advancement of material technology and production has led to higher grades of concrete strengths. In recent years a marked increase in the use of high-strength concrete (compressive strength, f′_c > 50MPa) has been evident in construction projects around the world. High-strength concrete (HSC) offers significantly better structural engineering properties, such as higher compressive and tensile strengths, higher stiffness, better durability, compared with conventional normal-strength concrete (NSC). Many structures built now have at least some components constructed with HSC. However, to a large extent, practice has preceded theory with constitutive equations simply being extrapolated to higher strengths. The main concern regarding the use of HS Concrete is the reduction in ductility with the increase in compressive strength observed under uniaxial compression. Past research has shown that members made of HSC exhibit, in some instances, different failure mechanisms, and simply extrapolating models and equations meant for NSC to HSC may lead to unsafe designs. Major codes of practice around the world are still based on experimental and theoretical results derived from investigations on NSC. Individual design rules codified in any of the national and international design codes need to be experimentally verified and categorized with a view to taking further action. In some instances structural designers are unable to take full advantage of the material because of insufficient information. Recent developments in design and performance of HSC members, especially the pape'rs published within the last two or three years are presented in this paper. The paper covers the topics of engineering properties, fire design, flexural members, shear and torsion, bond and anchorage, HSC columns, transmission of HSC column loads through weaker slabs, walls, impact resistance and seismic design of HSC structures.
机译：材料技术和生产的进步带来了更高等级的混凝土强度。近年来，在世界各地的建筑项目中，高强度混凝土的使用显着增加（抗压强度，f'_c> 50MPa）。与常规的普通强度混凝土（NSC）相比，高强度混凝土（HSC）具有明显更好的结构工程性能，例如更高的抗压强度和拉伸强度，更高的刚度，更好的耐久性。现在建造的许多结构至少具有使用HSC建造的某些组件。但是，在很大程度上，实践早于理论，而本构方程只是简单地推断出更高的强度。使用HS混凝土的主要问题是，在单轴压缩下，延展性会随着压缩强度的增加而降低。过去的研究表明，由HSC制成的成员在某些情况下会表现出不同的失效机制，仅将NSC的模型和方程式推导到HSC可能会导致设计不安全。世界范围内的主要实践准则仍然基于对NSC的调查得出的实验和理论结果。编码在国家和国际设计规范中的单个设计规则需要进行实验验证和分类，以采取进一步的措施。在某些情况下，结构设计师由于信息不足而无法充分利用材料。本文介绍了HSC成员在设计和性能方面的最新发展，尤其是最近两三年内发表的论文。本文涵盖以下主题：工程特性，火灾设计，抗弯构件，剪切和扭转，粘结和锚固，HSC柱，HSC柱载荷通过较弱的平板传递，墙壁，HSC结构的抗冲击性和抗震设计。

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