不同柱梁抗弯承载力比对框架结构抗倒塌性能的影响
Effect of Different Ratios of Column-to-beam Flexural Strength on Seismic-collapse Resistance Behavior of Frame Structures

设计不同柱梁抗弯承载力比（ηc-bua）的5个纤维增强混凝土（FRC）框架结构及3个钢筋混凝土（RC）框架结构，利用性能评估软件Perform-3D进行Pushover及IDA计算分析，得出其破坏机制及易损性曲线。结果表明，柱、梁端部局部采用FRC后，承载力有一定提高，峰值位移有较大提高；ηc-bua对FRC框架结构的破坏机制影响很大；ηc-bua对FRC框架结构地震反应也有一定的影响，其比值越大，超越概率越小，且随期望破坏程度的加重，这种影响也趋于明显，当ηc-bua在1.2以上时，结构的倒塌概率均小于10%，满足大震不倒的概率要求。
In this study, we designed five fiber-reinforced concrete (FRC) frames and three reinforced concrete frames with different ratios of column-to-beam flexural strength (ηc-bua) and determined their failure modes and fragility curves using the pushover and increment dynamic analysis methods and the capacity evaluation software Perform-3D. The results show improved deformation and bearing capacities of FRC frames in which FRC is used at the beam and column ends, and that the deformation capacity of FRC frames increased over a greater range than the structural bearing capacity. The ηc-bua has a great effect on the failure mechanism of FRC frames. The ηc-bua also has some effect on the structural seismic response of the FRC frame, whereby the greater is its value, the lower is the probability of exceedance, which becomes more obvious when the expected failure is more serious. The collapse probability is less than 10 percent, which satisfies the requirement of the seismic design code for buildings when the ηc-bua value is greater than 1.2.