剪力墙连梁在循环荷载下的受力性能研究

Behaviors of coupling beam of shear walls under circle load

运用ANSYS软件对小跨高比连梁受力性能进行了非线性有限元模拟,分析了连梁在循环荷载作用下的滞回性能、裂缝开展情况、钢筋及混凝的应力及应变分布规律。研究结果表明:在循环荷载下,普通配筋连梁形成剪切破坏,但配菱形交叉钢筋的连梁形成弯曲剪切破坏;配有菱形交叉钢筋的连梁与普通配筋同跨高比连梁对比,延性约增大28%,承载力提高约44%;配有菱形交叉钢筋连梁的钢筋受力更合理,有效地改善了连梁的受力性能。

ANSYS was used to investigate mechanical behavior of coupling beams with small depth-to-span ratio by nonlinear finite element simulation,and the hysteretic behavior and cracking development of coupling beams were analyzed under cyclic loading,as well as the distribution regularity of stress and strain of steel and concrete.The result indicates that under cyclic loading,routine coupling beams form shear destruction;but the newly designed coupling beams with diagonal and diamond-patterned reinforcing bars form flexural shear destruction.Compared with the routine coupling beams with the same depth-to-span ratio,the ductility of the newly designed coupling beams with diagonal and diamond-patterned reinforcing bars increases approximately 28% and load capacity increases about 44%.The coupling beams with diagonal and diamond-patterned reinforcing bars have more reasonable load bearing behaviors,and it can effectively improve the mechanical behavior of coupling beams.