论文部分内容阅读
为了研究不同地震损伤程度下方钢管混凝土柱修复加固后的抗震性能,进行了7根柱的模拟地震加载、损伤修复加固和加固后的低周往复荷载破坏试验,研究了外包钢套和碳纤维布两种修复加固方法以及不同地震损伤程度对加固效果的影响。对比了两种方法的加固效果,并分析相应的加固机理。试验结果表明,经过外包钢套合理、可靠的加固柱的承载力和刚度有了显著提高,其抗震性能得到极大的改善;碳纤维布加固对承载力影响不明显,但改善了柱的延性,抗震性能得到了明显提高;在一定损伤程度下,加固柱恢复甚至超过受损前的抗震性能。对于方钢管混凝土柱来说,无论从极限承载力、延性、耗能能力及承载力和刚度退化来看,采用外包钢套、碳纤维布加固均是一种有效的抗震加固方法,就加固效果而言,外包钢套加固效果更优。
In order to study the seismic performance of concrete-filled steel tubular columns under different seismic damage levels, seismic loading of seven columns, damage repair and reinforcement and low-cycle reciprocating load failure test were studied. The effects of outer steel sleeve and carbon fiber cloth Influence of Two Restoration and Reinforcement Methods and Different Degree of Earthquake Damage on Reinforcement Effect. Compare the reinforcement effect of the two methods and analyze the corresponding reinforcement mechanism. The test results show that the bearing capacity and stiffness of the reinforced concrete column with reasonable and reliable steel sheathing have been significantly improved and the seismic performance has been greatly improved. However, the effect of CFRP reinforcement on the bearing capacity is not obvious, but the ductility of the column is improved , Seismic performance has been significantly improved; at a certain degree of damage, reinforced columns recover even before the damage of the seismic performance. For square concrete-filled steel tube columns, no matter from ultimate bearing capacity, ductility, energy dissipation capacity and bearing capacity and stiffness degradation, the use of steel sheathing and CFRP reinforcement are both effective seismic strengthening methods. In terms of outsourcing steel reinforcement better.