高强度无腹筋梁斜截面破坏的数值分析

It is hard to do many experiments to study the behavior of ultrahigh strength RC beams without stirrups because of the low technology and economy nowadays. And it is very necessary to have some simulative experiments to fetch up the deficient data using nonlinear finite element analysis. Based on the reasons above this paper had studied the shear characteristic and shear strength of ultrahigh strength RC beams without stirrups, compared with the real experiment. Considered the material misalignment, this paper had also investigate the influence of shear failure modes with different parameters fc ′ and a / h0. And the numerical analysis result indicated that shear strength of the ultrahigh strength RC beams is very sensitive with the two variable factors above. (The variable factors are the concrete compressive strength (fc ′) and the ratio of shear span to effective depth (a / h0) respectively.)Because of the concrete compressive strength (fc ′), the influence on various shear failure modes is different. The results of simulation are generally in conformance with the experiment.