Study On Structure Design Optimization Of Shallow Buried Penstock On Downstream Gravity Dam Surface

Downstream Dam Surface Steel Lined Shallow reinforced concrete pipes (referred to as the dam in shallow tube) is one of the main tube Hydropower Plants Conduit, nearly half a century has made great progress. It is widely used in the concrete dam hydropower station because of its advantages in terms of layout, load, cost, construction, etc. Since the dam in shallow tube designed to allow outsourcing of concrete cracking, it is necessary to consider concrete cracking nonlinear basis, the force behind the dam in shallow tube failure characteristics and seismic performance of a study.Taking a hydropower station, by ABAQUS finite element analysis software to calculate the pipeline structure, the use of concrete damage plasticity constitutive model of concrete dam in shallow tube outsourcing thickness, steel liner parameters, steel consumption and optimize the layout The main research contents are as follows:(1) Concrete damaged plasticity model based on the dam in shallow tube steel and reinforced concrete surrounding the complete bearing tube located at the dam parting cushion and cushion three kinds of outsourcing steel liner pipe laying program was studied, and a variety of programs geometry and mechanical parameters were optimized. The actual laying pipe in shallow dam project mode is selected as steel cushion outsourcing program, which pipe dam structure stress better, it has certain advantages in terms of structural safety.(2) Shallow consider interaction dam pipe and dam, pipeline and dam the overall structure of three-dimensional finite element model to calculate seismic condition comparative analysis of the seismic safety of different ways buried pipeline structure. From the structural strength of the pipeline to ensure security, control tube dam structure crack development, give full play to the mechanical properties of steel and concrete, etc. Recommended dam pipe buried in shallow way to cushion steel outsourcing program.(3) Diversion system under paragraph level three-dimensional finite element analysis, discussion and deformation under stress situation when crossing the flat steel segment joints range of different settings laying outsourcing cushion layer structure. By laying all-inclusive three kinds of cushion length comparative analysis, lower flat section steel set Outsourcing cushioning layer can be well compensated plant dam sub uneven deformation of joints, flat section steel recommendation outsourcing cushion layer axially laying range 11m (parting on the downstream side of each 5.5m).