外包钢加固简支混凝土柱的屈曲临界荷载计算  

BUCKLING CRITICAL LOAD CALCULATION FOR SIMPLY-SUPPORT CONCRETE COLUMN STRENGTHENED WITH ANGLE STEEL

作　　者：张吉兆[1] 房霆宸 王伟 

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]上海建工集团工程研究总院,200080 [3]上海港城开发有限公司,200032

出　　处：《工业建筑》2013年第10期160-165,共6页Industrial Construction

基　　金：安徽省住房和城乡建设厅研究开发项目(2011YF-39)

摘　　要：为了改善混凝土柱的抗屈曲失稳的受力性能,使其承载力和变形能力得到充分的发挥,将角钢与缀板形成的钢骨架应用于加固混凝土柱是一种有效的加固方法。利用弹性理论,推导外包钢加固简支细长混凝土柱的屈曲临界荷载计算公式,通过有限元分析验证解析公式的正确性;并据此进行了参数化分析,探讨了角钢截面形式、混凝土柱高度以及缀板厚度对加固柱屈曲临界荷载的影响。计算结果表明:在角钢面积固定时,"厚且短"的角钢截面形式更有利于提高屈曲临界承载力;屈曲临界荷载的提高随着缀板厚度的增加也呈线性增加;不同的混凝土柱高度对屈曲临界荷载有显著影响。外包钢加固简支混凝土柱的屈曲临界荷载计算公式具有理论合理性和适用性。In order to improve the ability of resisting buckling deformation and fully explore the potential of loading capacity, it is an effective method to use angle steel and batten plate to strengthen concrete column. Based on elastic theory, the buckling critical load calculation formula of simply-support concrete column strengthened with angle steel was derived, whose correctness was verified by FEA. Then, parameterization analysis was performed and the effect of angle steel section form, concrete column height and batten plate thickness on the critical load was investigated. The results of calculation showed that when the area of the angle-steel was constant, the ＂thick and short＂ cross-section form of angle steel was more favorable to the enhancement of critical buckling load. With the increase of the thickness of batten plate, the critical load was linearly increased. Moreover, the concrete column height had a distinct impact on the critical buckling load. The calculation formula of simply-support concrete column strengthened with angle steel was feasible and reasonable.

关 键 词：混凝土柱 加固 角钢 缀板 解析公式 有限元 

分 类 号：TU375.3[建筑科学—结构工程]