Energy Dissipation Analysis Of RC Frame Structure Base On Load Path And Anti-Torsion Performance Evaluation

In recent years, casualties and property loss caused by the frequent earthquake are very serious. Energy dissipation devices are being increasingly used in new engineering projects and reinforcement projects of existing structures. As an effective way to protect the structural safety, energy dissipation technology has been a hot issue in the field of seismic design of buildings. Under seismic action, structural destruction is not happening suddenly but is a accumulating and developing process of local structural element failure. As we know, these structural elements which transmit the main load were always damaged. In this paper, with the perspective of protecting these important elements, the distribution regularity of structural important elements in load path was analyzed firstly. In this process, structures were classified into two structural types including regular plane RC frame structure and irregular plane RC frame structure. Secondly, a new optimal allocation method of energy dissipation braces base on the load path is proposed. Finally, a new method is put forward to evaluate the structural torsion properties.The main research contents of this article are listed as followed:(1) Researching the distribution regularity of most important structural elements in load path. Two structural types including regular plane RC frame structure and irregular plane RC frame structure are considered respectively. All structural elements importance indexes are calculated by adopting Nonlinear Static Analysis and Generalized Rigidity methods. Then distribution location diagrams are plotted to visualize the distribution regularity of these important elements in load path.(2)Using energy dissipation design method based load path to design RC frame energy dissipation structure. Firstly, the energy dissipation design method based load path is put forward in consideration of the safety of structural elements. Secondly, these distribution locations of energy dissipation devices are quantified by using the component importance coefficients as evaluation indicators. Then specific energy dissipation design steps are listed in this paper. Finally, energy dissipation designs of two structural types including regular plane RC frame structure and irregular plane RC frame structure are made respectively.(3)Evaluating seismic torsional performance of the irregular plane RC frame structure. Firstly, a new seismic torsional performance evaluation method is put forward. Secondly, torsional angle demand curves are plotted based on the relevant requirements and interlayer torsion angle limit given in codes. And then torsion angle capacity curves are plotted based on layer torsion angle value calculated from this new method. Finally, torsional angle demand curves and capacity curves are plotted into the same diagram, then seismic torsional performance of the irregular plane RC frame structure is evaluated based on this diagram.