Experimental Study Of RCC Gravity Dam Strengthened With Steel Reinforcement In Monolith For Seismic Resistance

With the rapid development of national economy, the exploitation and utilization of water power is stepped the key development stage. A batch of dams, word-class high concrete dams, have being constructed in southwest of China. However, the place is a high intensity seismic zone. Specially, the adopted design level of earthquake ground motion reaches to nine degree at some dam sites. It is very significant that aseismic safety of dams for industrial and agricultural production and the safety of the people's life and property in the large region of downstream. In order to study the dynamic destruction mechanism and aseismic measures of concrete gravity dam in earthquake, the dynamic shaking table model tests and finite element analysis were adopted to investigate failure mode and aseismic measures in this paper. The optimization design of aseismic reinforcement at some key parts was also discussed. Test results can provide references for engineering design. The main contents of the paper are five parts as follows:1. As stainless steel wires were embedded in emulation concrete, properties of them were studied for the purpose of simulation of reinforced concrete. Base on four point bend tests, neglction of bond-slip was concluded at model tests. With this hypothesis, similarity of quantity of steel was elicited to employ effective area scale of steel bars. The derivation process was applied with Newton's third law and similarity of cohesive force.2. High plastic emulation materials were made by means of using emulation concrete as basal body and added clay or added crushed rubbers. And physical characteristics of materials were investigated. The test results can be useful for study of model's large deformation and plastic strain in view of incomplete geometric similarity.3. Model test of Ahai RCC dam was carried out with electric-hydraulic underwater seismic simulated servo system. Model test was divided into two sections, models without aseismic measures and models with aseismic reinforced concrete at some key parts. And then the failure mode of Ahai house-dam and effect of aseismic reinforced concrete for water retaining dam section were studied.4. Finite element analysis of Ahai RCC dam was conducted with software of ABAQUS. The plastic damage model was applied as concrete nonlinear constitutive relation. Base on the similarity of aseismic steel and quantity of aseismic wire in test, the finite model with rebar was created. The effect of rebar in water retaining dam section was analyzed. 5. Optimization design of reinforcement at some key parts of dam had been made through numerical calculation of nonlinear reaction under design input of ground motion. Concretely, the research contents included dynamic amplification coefficients,extreme values of stress,extreme values of strain,development of damage,variation of irrecoverable strain and dissipation energy. The paper also investigated aseismic bars under the circumstances of linear elastic constitutive relationship.