## 5 Seismic Risk Assessment of Novel SCPC Frame
### Overall Responses to Near-Fault Earthquakes
The peak inter-story drift ratios for each story at MCE level are about twice that at DBE level. It indicates that the degree of gap-opening at the beam-column interface has significantly increased at the MCE level, the bending stiffness of the connection has reduced. Figure 15 shows the maximum residual inter-story ratio for each story at the DBE and MCE levels for the 21 near-fault earthquake waves. The peak residual inter-story drift ratios of the novel frame for all the stories are minimal, satisfy the limiting value which cannot exceed in 0.2% for IO limit state and 0.5% for RE limit state. The maximum residual inter-story ratios both occur on the first floor, which are only \(3.85\times 10^{-5}\) rad and \(1.87\times 10^{-4}\) rad at DBE and MCE level and the peak residual inter-story drift ratios of the above stories are similar and close to zero. It indicates the novel frame with hysteretic dampers still has excellent self-centering ability under the near-fault seismic wave actions. Figure 14: Maximum inter-story drift ratio for each near-fault ground motion and for each story. Figure 15: Maximum residual inter-story drift ratio for each story. Figure 16a and b show the maximum inter-story shear force for each earthquake wave and for each story under the two levels for the 21 near-fault earthquake waves, respectively. The peak inter-story shear force are 631 kN and 930 kN corresponding to 21 earthquake waves at the DBE and MCE levels, respectively. The peak inter-story shear force for each story have occurred on the first story under the two levels. The maximum responses of the first story are 365 kN and 650 kN at the DBE and MCE levels, respectively and the disparities between them are less than twice. From the second floor to the fifth floor, the inter-story shear forces decrease gradually. The maximum responses form the second to fifth story are 343 kN, 302 kN, 256 kN and 202 kN under the DBE level and 562 kN, 515 kN, 401 kN and 305 kN under the MCE level, respectively. It indicates that the novel SCPC frame has sufficient lateral stiffness to undertake more loadings. Figure 17 displays the maximum connection relative rotation and the maximum standard PT tendons force for each story at the two seismic levels dunder the near-fault earthquake waves loading, \(T_{N}\) defines as the standardized PT force, which is the ratio of PT force and PT yielding force \(T_{y}\). Figure 17a indicates--the maximum connection relative rotation of the novel SCPC frame for each story is minimal. The peak value is \(8.5\times 10^{-4}\) rad for the second floor under the DBE level and it means the beam-column interface do not open basically. The peak connection relative rotations increase obviously at the MCE level, the peak value is \(3\times 10^{-3}\) rad occurred at the first floor. The maximum connection rotations decrease gradually and the value of the top floor is only \(1.3\times 10^{-3}\) rad. Figure 17b indicates--the maximum PT tendons force is relatively small for each story under DBE level and increase significantly at the MCE seismic level. In order to avoid great residual displacement in the core zones of beam-column connection, the PT tendons should not yield. The peak values of the maximum standardized PT tendon forces are about 0.48 times and 0.6 times of the yielding tendon force at the DBE and MCE levels. From the analysis results, unbonded tendons force for each story is in the elastic stage, far from reaching its yield strength under the MCE level. The hysteretic relationship of the beam end moment \(M\) and connection relative rotation \(\theta_{r}\) is the important index to assess the energy consumption characteristics of the novel SCPC structure. Figure 18 shows the \(M\)- \(\theta_{r}\) curve of the joint for the earthquake wave KJM090 loading under the MCE level. The joint is located in the right of the second span of the second story. The figure shows the peak connection rotation is only 0.003 and the peak connection moment is 620 KN.