Damage Evolution Analysis Of Rc Frames Structure Induced By Mining And Earthquakes

In our country, the resources of coal are rich and extensive, especially east china, north china and all provinces of southwest china have a lot of coal mines, which are close together with cities and towns. Earthquakes in China are also frequent, and almost all large cities are located at seismic areas. With the continuous development of our country's modernization, it is a very important and urgent topic to study how to do the anti-mining and anti-seismic design of RC frame structures. It is a key to resolve the problem that mastering the rules of damage evolution of RC frames induced by both mining and earthquakes. Therefore, relying on the natural science foundation (The Foundation theory research on the double protects to the structures from the earthquakes and the mining), proceeding from constructions' harmfulness from mining and earthquakes, based on the existed theory, the beam column element model of RC frame structure is set up in the paper by ANSYS. Then through ANSYS mining influence, earthquake influence and coupling effect of both all are analyzed. The main contents as following:(1) Research background and meaning of the paper are firstly introduced; The effect to construction from mining and earthquake are summarized; It is put forward to study the destroy process in the mining and earthquake by the viewpoint of damage theory.(2) All kinds of structural analysis model, element model, restoring force model, damage model and structure seismic response analysis method are discussed, and comparative analysis is done to decide the better or worse.(3) The mechanism of mining effect to construction is discussed in detail. It is emphasised on damage characters.(4) Based on the second chapter theory, simplified trilinear kinematic hardening hysteretic model and the three-dimensional beam element are adopt to set up the entire mathematical model of the structure. Moreover, Time-History dynamic method is chosen as structure seismic response analysis method. (5) The effect from mining to construction is analyzed by the software of ANSYS, then change and distribution rule of internal force is get in the process of earth deformation caused by mining.(6) Through the Time-History dynamic analysis to the damaged RC frames at each stage of mining process, the change and development rules for all kinds of displacements, time-history curves and plastic hinges are obtained.(7) Adopted the simplified integral damage models, it is obtained that damage indexes of every stage in the processing of earthquake and mining, then the rules of damage under different degree of mining effect and earthquake are concluded.