ABSTRACT
ABSTRACT: With considering tension softening of concrete, nonlinear analysis of the steel lined reinforced concrete penstock in Three Gorges hydropower station was made by using concrete damaged plasticity model (CDP) and compared with its model tests. The results under the design internal water pressure with considering tension softening of concrete show that the concrete at waist outside and top inside is the most vulnerable to cracking and its maximum crack width is 0.25 mm which is lower than the limit of specifications. The maximum stress of steel liner is at the top of the penstock and the maximum reinforcement stress is at the top of inner steel. The maximum stresses of steel liner and reinforcements are 132.1 MPa and 143.5 MPa, respectively, which are not more than the yield stress satisfying the safety. The simulation results are consistent with the model tests well on the cracking region, the maximum crack width, the stress magnitude of steel liner and its distribution laws.
1 INTRODUCTION
