冷热-荷载耦合下锂渣混凝土梁的受弯承载力

Flexural Capacity of Lithium Slag Reinforced Concrete Beams Under Coupling Between Loading and Thermal-cold Cycling

摘要:

为研究静载与冷热循环共同作用下锂渣混凝土梁的损伤机理和抗弯性能，对4组不同冷热循环次数（0、100、300）和静载水平（0、0.2、0.35）组合下的锂渣混凝土梁开展了抗弯加载试验。此外，基于轴心抗压试验得到的锂渣混凝土本构模型，通过对梁截面的受力分析，提出了冷热-荷载耦合下锂渣混凝土梁的受弯承载力计算公式。将公式所计算的结果同实测值对照，发现公式的计算结果均小于实测值，故在安全储备范围之内，可为大温差地区锂渣混凝土矩形截面梁受弯承载力的计算提供参考依据。

Abstract:

In order to study the damage mechanism and flexural performance of lithium slag concrete beams under coupling between loading and thermal-cold cycling，flexural loading tests were made on 4 groups of lithium slag concrete beams， which underwent the combined effect of a series of thermal-cold cycling （0， 100， 300） and static load levels （0， 0.2， 0.35）. In addition，a constitutive model of lithium slag concrete was established on the basis of the axial compression test. Through the force analysis of the beam section， the calculation formula of the flexural bearing capacity of the lithium slag concrete beam was proposed. A comparative study was made of the calculation and experiment results， and the theoretical calculation results prove to be less than those of the experiments. From the prospect of the safety-reservation，the study provides a reference for the calculation of the flexural bearing capacity of lithium slag concrete rectangular cross-section beams in the areas of large temperature changes.