Abstract：The thermo stresses in the concrete dam will produce because of changing of weather temperatures. The local fractures in gate pier of dam occur while the thermo stresses exceed the tensile strength of concrete，and sometimes，some fractures can extend from dam top to the spillway surface. Combining with the pier rehabilitation project of Fengman concrete dam，the nonlinear finite element method is applied for calculating the stress changes of concrete piers during anchoring process in the different load cases. The optimization arrangement method for prestress scales and anchoring locations are presented in order to deal with local stress larger than concrete tensile strength. The practical application shows that numerical simulation approach with finite element method is feasible to guide the design and operation of pier rehabilitation，and the proposed engineering measures are effective for preventing dam pier from local fracturing during anchoring process.
