Study On Energy-based Seismic Design Methodology For Reinforced Concrete Frame-Shear Wall Structures

The energy-based seismic design method for reinforced concrete (RC) frame-shear wall structures is studied based on the damage control philosophy. The main achievements of this dissertation are as follows:1. The study on the nonlinear numerical models for RC frames and RC shear walls. A fiber model and a multi-layer shell element are developed respectively for RC frame structures and RC shear walls based on the general-purpose finite element analysis package MSC.MARC. These models, with their accuracy and effectiveness being verified by a series of experiments, provide a reliable basis for the numerical simulations of the seismic behavior of RC structures.2. The study on prediction of seismic displacement responses of RC frame-shear wall structures. The Pushover analysis commonly used in structural seismic performance evaluations is discussed in depth. The seismic displacement responses of two RC frame-shear wall structures of 10 and 18 stories predicted by different types of Pushover analyses are compared with those given by the nonlinear dynamic analysis, showing that the Model Pushover Analysis (MPA) method is capable of predicting the seismic displacement responses of RC frame-shear wall structures with good accuracy.3. The study on the conditions of controlling the damage modes of RC frame-shear wall structures. The damage modes, seismic performance and the controllability of cumulative hysteretic energy (EH) distributions are studied through nonlinear dynamic analyses of several RC frame-shear wall structures with various parameters. A rational damage mode to make the EH distribution controllable in RC frame-shear wall structures is proposed. The conditions of controlling the damage modes of RC frame-shear wall structures are concluded based on the capacity design method.4. The study on the determination of energy-dissipating demand in RC frame-shear wall structure. Among currently-available methods of determining the energy input and cumulative hysteretic energy, the modal combination method is recommended for RC frame-shear wall structures. Based on parametric analysis, the EH distribution among the structural components and along the structural height are investigated and design formula to determine EH distribution for engineering application is proposed. By comparing with time-histroy results, the MPA method is sugguested to predict the EH distribution between different members in each storey.5. The study on the framework of the energy-based seismic design method for RC frame-shear wall structure. A combined energy- and displacement-based seismic design methodology is proposed by employing the dual-failure model of RC components considering both the deformation and the cumulative hysteretic energy. The implementation of this method is illustrated through a case study. It is shown through extensive nonlinear dynamic analysis that thus-designed structures have adequate deformation capacity and energy-dissipating capacity to meet the multi-stage seismic performance objectives.