柱截面配筋对空间异形柱框架结构性能的影响

Influence to structure performance of 3D-frame with special-shaped columns by reinforcing bars

运用空间异形柱框架结构的非线性有限元分析方法,对该框架作适当的单元划分,并用子结构法提高计算效率,运用分区离散截面法来完成对异形截面的分离与组合。通过对不同柱截面配筋形式的空间异形柱框架在不同方向水平荷载作用下的推覆分析,获得异形柱框架结构在破坏过程、承载力、延性、侧向位移、扭转、滞回性能及刚度退化等各方面的结构性能受柱截面配筋形式的影响规律。纵筋较集中在截面端部时,框架极限承载力较好,但要实现较好的延性,则需要根据柱轴压比情况在截面上适当布置纵筋。

Utilizing the nonlinear finite analysis method for the 3D-frame with special-shaped columns the structure performance is studied such as failure process, bearing capacity, ductility, lateral displacement, torsion, hysteretic performance and stiffness degeneracy. To increase computational efficiency, the substructure method and zonal discrete section method are applied to separate and fabricate the special-section of the column. The influence regularity on structure performance of the 3D-frame by distribution of reinforcement in column is discovered after the 3D-frame was analyzed by push-over under horizontal loading with various directions. The frame has better bearing capacity while more reinforcing bars located in the periphery of column section. The flame can have better ductility while reinforcing bars properly distributed in column section according to axial compression ratio.