基于未确知数学方法的方钢管混凝土粘结强度试验分析

Experimental study on bond strength between steel and concrete in CFSST structures based on unascertained mathematics theory

通过9根方钢管混凝土(CFSST)推出构件试验,分析了方钢管混凝土粘结滑移机理,运用未确知信息数学处理方法对方钢管混凝土内部较为复杂的粘结强度进行了分析计算,探讨了构件宽厚比和长细比对粘结强度的影响。试验结果表明,随着宽厚比的增加,粘结强度有明显减小的趋势;随长细比的增加,粘结强度变化不明显;未确知信息数学处理方法计算的极限粘结强度更精细,较全面地反映了试件的实际承载力情况。

According to the push-out test of 9 concrete filled square steel tubular（CFSST） specimens, the main parameters of the width-to-thickness ratio（B/T） and the slenderness ratio（L/B） are analyzed,and the bond-slip mechanisms between the infilled concrete and the inner surface of the square steel tube is investigated. The results indicated that the bond strength decreases significantly with an increase in width-to-thickness ratio, whereas changes slightly with the increase in slenderness ratio. The ultimate bond strength can be calculated precisely based on unascertained mathematics theory and fully reflects the bond behavior in CFSST structures.