CFRP-PCPs复合筋混凝土偏心受压柱刚度及变形分析

摘要

Based on the tests of 9 CFRP-PCPs composite reinforced concrete eccentric compression columns with different composite rib section size and eccentricity under eccentric compression,the failure feature and change rule of lateral deflection of eccentric compres-sion columns were investigated.The test results show that the CFRP-PCPs composite reinforced concrete eccentric compression columns varies under different stages and has influences on the deformation feature of eccentric compression columns.The maximum deflection val-ue of the CFRP-PCPs composite reinforced concrete eccentric compression column increases with the increase of eccentricity,and de-creases with the increase of the section size of the composite bar.Based on the test results and the simplified mechanical model of eccentric compression columns,the calculation formula of lateral deflection was derived and the calculation formula of stiffness of eccentric com-pression columns was also proposed.It is shown that the maximum lateral deflection calculated by the proposed formulas is in good agree-ment with the test value and can satisfy the calculated requirements.%以CFRP-PCPs复合筋截面尺寸和相对偏心距为主要参数,制作9个CFRP-PCPs复合筋混凝土偏心受压柱进行加载试验,分析偏心受压柱的侧向挠度变化规律和破坏特征.结果表明:在各个受力阶段,CFRP-PCPs复合筋混凝土偏心受压柱的刚度发生变化,并对CFRP-PCPs复合筋混凝土偏心受压柱的变形特征产生影响.CFRP-PCPs复合筋混凝土偏心受压柱的最大挠度值随着相对偏心距增加而增大,随复合筋截面尺寸增大而减小.在试验的基础上,根据偏心受压柱在受力时的简化力学模型,推导受压柱的侧向挠度计算式,从而提出CFRP-PCPs复合筋混凝土偏心受压柱的截面刚度计算式.根据该式进行计算,得到的偏心受压柱侧向挠度最大值,与实测值进行比较,吻合度较好,能够满足设计要求.