Pushover Analysis of Low-Rise Reinforced Concrete Buildings with the Variation of Plastic Hinge Locations
摘要
This study presents the structural performance evaluation of low-rise reinforced concrete buildings using pushover analysis through a variation of plastic hinge location. Four-story buildings utilize dual system, combined special moment resisting frame and special concrete wall system as the lateral force resisting system, were analyzed using MIDAS GEN software. Three variations of plastic hinge locations include at beam-column-wall (Model 1), beam only (Model 2), and beam-wall (Model 3). Guidelines of performing non-linear static analysis prescribed by ASCE 41 were used to conduct the pushover analyses. From the three models, it is shown that Model 3 has the largest roof displacement at performance point, which are 0.1316 m in X direction and 0.1445 m in Y direction. These displacements were lower than the maximum displacement for Life Safety (LS), taken as 2% of total height of structure. Results on the seismic performance factors (R, Cd, and Ω0) were varied in between the three models which had insignificant differences. From the three models, the obtained R values ranged between 4.13 to 4.44 in X direction and 6.25 to 6.63 in Y direction. The Cd and Ω0 of the three models ranged between 7.49 to 10 and 4.28 to 5.68, respectively, for both directions. The values of the two parameters exceed the minimum values obtained by ASCE 7 standard. Hence, the overall performance of the three models meets the requirement by ASCE 7.