以设计轴压比限值为目标的核心钢筋优化布置分析

本文以设计轴压比限值为目标,针对均匀点阵式分布和矩形周圈均匀分布两种情况,以理论推导的方式研究钢筋混凝土柱核芯钢筋的优化布置。分析表明,均匀点阵式分布明显优于矩形周圈分布；当核芯钢筋分布范围的边长系数小于0．5时,核心钢筋能有效提高设计轴压比限值,当边长系数大于0．5时,随边长系数的增大核芯钢筋对提高设计轴压比限值的效果显著降低。因此,在满足施工方便和施工质量的前提下,应尽量减小核芯钢筋的分布边长。此外,设计轴压比提高幅度与核芯钢筋配筋率之间基本上成正比关系。

Research on the Best Configuration of Core Steel Bars in the Interest for Higher Permitted Axial Compression Ratio

Aimed at higher permitted compression ratio of concrete column section, and at two kind of core steel bar configuration, i,e. even lattice distribution and even rectangular periphery distribution, theoretical analysis on the optimal configuration of core steel bars is conducted. Results show that even lattice distribution is superior to even rectangular periphery distribution. When the edge ratio is less than 0.5, the permitted compression ratio increases effectively with the steel ratio. When the edge ratio is larger than 0.5, the efficiency for core steel to the permitted compression ratio decreases dramatically. So when convenience and quality for construction is guaranteed, the edge ratio should be reduced as small as possible. In addition, the increment of permitted compression ratio is basically linear to core steel ratio.