Z形截面桁架式型钢混凝土柱正截面承载力研究

Study on Z-cross section trussed special-shaped steel reinforced concrete column's normal-section bearing capacity

进行了4根不同含钢率的桁架式型钢混凝土Z形柱试件在不同荷载角及不同偏心距压力作用下的非线性有限元分析,研究其破坏的一般规律和极限承载力.分析得到了试件中混凝土在不同荷载时的应变分布及在极限荷载作用下的中和轴位置,以及各个试件在不同荷载角以及不同偏心距压力作用下的极限承载力.分析结果表明在偏心压力作用下,这种柱子的破坏形态与普通混凝土构件相似,横截面平均应变符合平截面假定,极限承载力与延性比相同截面钢筋混凝土Z形有显著提高,并且随着含钢率的增加而不断增大.荷载角对于此种柱的承载力影响较大,不同荷载角作用的承载力差异明显.最后通过编制数值计算程序比较了试件C在这两种方法下所得到的极限承载力差异.

To study the general failure regularity and the ultimate bearing capacity of the column, the nonlinear finite analyses were done on 4 Z-cross section trussed special-shaped steel reinforced concrete columns with different steel ratio subjected to compression of different loading angle and different eccentricity. The analysis result show that the failure mode of the column is similar to the reinforced concrete column, the average strain of the cross section of the column accords with the plane section hypothesis, both the ultimate bearing capacity and the ductile performance of the column have more obviously improved than reinforced concrete column, and more steel in column, the more obvious. Loading angle has evident influence on the bearing capacity of the columns, and there are evident different bearing capacities of the columns under different loading angle compress. At last, the comparisons of specimen C＇s bearing capacity were done by utilizing numerical program and finite analysis method.