轴压加固柱承载力计算理论

Calculation Theory of Bearing Capacity under Axial Compression after Reinforcement

为了进一步研究轴心载荷作用下四周包裹钢筋混凝土加固钢柱的设计计算方法,分别基于我国两本规程对此加固柱的设计方法进行了分析.结果显示:持载状态下,加固柱可靠度需不大于一定初始应力水平指标;两个规范的设计遵循原有构件截面边缘屈服和加固后全截面屈服两种原则;静力载荷作用下,两规范都考虑新、旧截面应力重分布现象,动力载荷作用下只对钢材强度乘以了折减系数,且两种受力情况下都未考虑加固柱应力应变超前或滞后现象.

In order to further study the calculation method of axial strengthening steel column, two standards of reinforcement technology are analyzed. The results show that ： the initial stress level of reinforced column is limited to ensure reliability under load; two specifications are followed the original component whole cross section after section edge to yield and total cross-section yield after reinforcement; Under static load, both specification section consider stress redistribution after plastic deformation, but do not consider the stress redistribution under dynamic load and not consider the stress-strain lead or lag phenomenon of reinforced column.