Design for Serviceability of Ultra High Performance Concrete Structures
Design for Serviceability of Ultra High Performance Concrete Structures
复制标题
超高性能混凝土结构的使用性能设计
DOI：
10.1007/978-94-007-2436-5_54
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Ekkehard
中科院分区：
文献类型：
--
作者：
Leutbecher;Torsten;Fehling;Ekkehard
与钢筋混凝土和预应力混凝土相比，钢筋与纤维的组合导致结构性能的差异。这一事实对于超高性能混凝土（UHPC）特别重要，因为纤维通常被添加到这些混凝土中以提高延性。基于钢筋混凝土裂缝宽度计算的关系式，从平衡和协调两个方面考虑，介绍了纤维对混凝土开裂过程的影响。对于变形的计算的应力-应变关系的修改，推导出考虑到由于纤维的贡献内的裂纹截面和它们之间的拉伸硬化。由于其力学基础，这些公式不仅限于UHPC，而且普遍适用于所有类型的混凝土。
The combination of steel bar reinforcement with fibers causes differences in the structural behavior compared to reinforced and prestressed concrete. This fact is of special interest for ultra-high-performance concretes (UHPC), because fibers are added to these concretes generally to improve ductility. Based on the well-known relations concerning calculation of crack width for reinforced concrete, the influence of the fibers on the cracking process is introduced considering equilibrium and compatibility. For the calculation of deformations a modification of the stress-strain relationship is derived considering the tension stiffening due to the contribution of fibers within the cracked sections and in between them. Because of their mechanical basis, the equations are not limited to UHPC but generally applicable to all types of concrete.