The Seismic Performance and Global Collapse Resistance Capacity of Infilled Reinforced Concrete Frames Considering the Axial–Shear–Bending Interaction of Columns

Abstract

This paper presents a mechanism and method for simulating the axial–shear–bending interaction of a reinforced concrete (RC) column. The three-dimensional model of a multi-story infilled RC frame was modeled using the OpenSees software. Static pushover and nonlinear dynamic analyses under fortification and rare earthquakes were conducted using the model. Finally, based on the incremental dynamic analyses of 22 suites of ground-motion records, the global collapse resistance capacity of the infilled RC frame was evaluated using the evaluation method of a normal distribution. The analytical results show that the axial–shear–bending interaction is a key factor that affects the seismic response of infilled RC frames. Under the fortification earthquake condition, no obvious damage to physical structures was evident; the influence was relatively minor. However, under the condition of a rare earthquake, severe damage to physical structures was evident, resulting in the underestimation of the lateral inter-story drift ratio, while the degradation rates of the load capacity and global collapse resistance capacities for the infilled concrete frames were highly overestimated when the axial–shear–bending interaction was not considered.

Parametric Investigation of Self-Centering Prestressed Concrete Frame Structures with Variable Friction Dampers

“…The OpenSees (The Open System for Earthquake Engineering Simulation) [36] finite element software was used to simulate the numerical model of VFD-SCPC connections shown in Figure 2. All the beams and columns were simulated by the fiber-based nonlin ear beam-column element to obtain the distributed plasticity characteristics.…”

“…P-delta trans formation was used to convert the geometrical coordinates of the columns to take into account the p-delta effect caused by the lateral displacement of the structure. The concrete for the beams and columns was simulated using the Uniaxial Material Concrete 02 consti tutive model, which can consider the tension of concrete [36][37][38][39][40]; Longitudinal reinforced steel bars in beams and columns were modeled using a Steel 02 constitutive model, which was able to capture the hardening effect [41,42]. Prestressed strands were simulated by two Truss elements, which were parallel to the beam.…”

“…To evaluate the seismic performance of the VFD-SCPC frame and to study the influence of key parameters on the seismic performance of structures, combining the site features of the prototype structures and the principles relating to the selection method of ground-motion records stipulated by American ATC-63 (Applied Technology Council Project), 16 ground-motion records, which were selected from American PEER (The Pacific Earthquake Engineering Research Center) and the Wenchuan earthquake in China, were used as the excitations for the structure [36].…”