Numerical Study For High Concrete Gravity Dam Reinforced By Gfrp Rebar

With the rapid development of the water conservancy and hydropower career, our country had spent more and more financial and material resources, as well as human resources for the construction. The western development strategy had greatly contributed to the fast progress of water resources industry, so the western country which was rich in hydraulic resource became the first base of hydropower resources development. A group of300m class of arch dam and200m class of RCC gravity dam will be constructed. For the western that is located in the high seismic intensity region of China, had the dam suffered serious earthquake disasters, the consequences which endanger the safety of people’s life and property would be catastrophic. The neck of gravity dam is a typical weak position that will be damaged during the action of seismic loads, especially for the high concrete dam in the high earthquake intensity areas. Therefore, for our country where the geological disasters was frequent, it is an important problem to take necessary measures to improve the concrete dam’s seismic performance for dam engineering field.The block dam section of a high RCC gravity dam was taken as the research object, this paper mainly discussed improvement effect on dam seismic performance with strengthening measures by GFRP rebar. The research contents include:(1) After establishing the finite element model without any strengthening measures by using ANSYS software, the nonlinear dynamic time history analysis was accomplished. Then, the change regularity among dam’s crack distribution form, extreme value of displacement and acceleration under different earthquake peak acceleration have been discussed. Meanwhile, the compared condition for dynamic response of gravity dam with reinforcing measure by GFRP rebar had also been provided.(2) The MISO model was chosen for dam concrete, accomplishing time history analysis under different earthquake peak acceleration by strengthening measure with GFRP rebar in the dam neck. Then, comparing the results between gravity dam without and with measures and discussing influence on dynamic response of gravity dam with strengthening measures by GFRP rebar. The compared content includes dam’s crack distribution form, extreme value of displacement and acceleration as well as typical dam stress distribution.(3) The MISO model was chosen for dam concrete, accomplishing time history analysis under different earthquake peak acceleration by strengthening measure with steel rebar in the dam neck and comparing dynamic response of gravity dam between strengthening measure with GFRP rebar and steel rebar. The specific content includes extreme value of displacement and acceleration, typical dam stress distribution as well as the maximum of axial stress between GFRP rebar and steel rebar.(4) The DP model was chosen for dam concrete, accomplishing time history analysis with and without GFRP rebar under different earthquake peak acceleration. Then, comparing the results and discussing the difference on results between DP model and MISO model. The content includes dam’s crack distribution form, extreme value of displacement and acceleration as well as the maximum of axial stress of GFRP rebar.