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

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.

Key words:lithium slag concrete beams;coupling between loading and thermal-cold cycling;flexural bearing capacity;elastoplastic damage constitutive