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Increasing ductility in heavily reinforced LWAC structures

机译：增强LWAC结构的延展性

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This study focuses on the ductility of lightweight aggregate concrete (LWAC) in compression. For practical purposes, the well-known brittleness of LWAC compared to normal density concrete has limited the use of the material. Demands for energy dissipation and/or a controlled behaviour after failure may exclude LWAC as the preferred material, while an increase of the ductility in the compression zone in bending is made possible by employing closed links and/or fibre reinforcement. An experimental programme was set up, which consists of eight over-reinforced concrete beams subjected to four-point bending in order to study the ductility. The LWAC had a mass density of approximately 1800 kg/m~3, with a compressive strength of approximately 35 MPa. Four different configurations of the beams were investigated, only with LWAC in the compression zone, closed links with a spacing of 100 mm, 1% of steel fibre reinforcement and a combination of closed links and steel fibres. The pre-peak behaviour was approximately the same for all configurations, and as expected, the beams with only LWAC had a very brittle response after peak load. The other beams had different post-peak responses, but all were able to carry the load with quite large deflections after maximum loading. Moreover, the combination with both fibres and links demonstrated highly ductile behaviour.
机译：这项研究的重点是轻质骨料混凝土（LWAC）在压缩状态下的延展性。出于实际目的，与普通密度混凝土相比，LWAC的众所周知的脆性限制了该材料的使用。对能量耗散和/或失效后受控行为的要求可能不包括LWAC作为首选材料，而通过采用封闭链节和/或纤维增强材料可以提高弯曲时压缩区域的延展性。建立了一个实验程序，该程序由八根经过四点弯曲的超筋混凝土梁组成，以研究延性。 LWAC的质量密度为约1800kg / m 3，抗压强度为约35MPa。仅在压缩区内使用LWAC，间距为100 mm的封闭链节，钢纤维增强材料的1％以及封闭链节和钢纤维的组合，研究了梁的四种不同配置。对于所有配置，峰前行为大致相同，并且如预期的那样，仅LWAC的光束在峰值负载后具有非常脆的响应。其他光束具有不同的峰后响应，但是在最大负载之后，所有光束都能够以较大的挠度承载负载。此外，纤维和链节的结合表现出高度的延展性。

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