Kołodziejczyk Ewelina, Waśniewski Tomasz, Starý Vojtěch, Dvořák Richard, Rabenda Martyna
Department of Concrete Structures, Lodz University of Technology, Politechniki 6, 93-590 Lodz, Poland.
Department of Construction Management and Economics, Faculty of Civil Engineering, Czech Technical University in Prague, Jugoslávských Partyzánů 1580/3, Praha 6-Dejvice, 160 00 Prague, Czech Republic.
Materials (Basel). 2025 Mar 16;18(6):1312. doi: 10.3390/ma18061312.
This paper covers the analysis of the behavior of columns made of LWAC (Lightweight Aggregate Concrete), which can be used as a substitute for normal-density concrete. This work presents an experimental research program focused on second-order effects in slender elements (λ = 74) made of LWAC and normal-density concrete tested under eccentric load. Elements with two ratios of longitudinal reinforcement (0.9%, 2.3%) were considered. Despite the similar compressive strengths of the concrete, the significantly different moduli of elasticity of the two types of concrete caused the lightweight concrete columns to show higher displacements, leading to their lower load bearing capacity. This disproportion was more pronounced for low longitudinal reinforcement. In the second part of this experiment, the behavior of the columns was simulated using models taken from the literature. The analysis showed that the models often do not accurately predict the elastic modulus or LWAC limit strain of concrete, so when trying to predict the behavior of this type of element accurately, these parameters should be determined experimentally.
本文涵盖了对轻集料混凝土（LWAC）制成的柱体性能的分析，这种混凝土可用作普通密度混凝土的替代品。这项工作提出了一个实验研究项目，重点关注在偏心荷载作用下由轻集料混凝土和普通密度混凝土制成的细长构件（λ = 74）中的二阶效应。考虑了两种纵筋配筋率（0.9%，2.3%）的构件。尽管两种混凝土的抗压强度相似，但两种混凝土显著不同的弹性模量导致轻混凝土柱体表现出更高的位移，从而使其承载能力较低。这种差异在纵筋配筋率较低时更为明显。在本实验的第二部分，使用从文献中获取的模型对柱体的性能进行了模拟。分析表明，这些模型常常不能准确预测混凝土的弹性模量或轻集料混凝土的极限应变，因此在试图准确预测这类构件的性能时，这些参数应通过实验确定。
