Research Of Lateral Restraint Influence On Pre-stressed Effect Of Concrete Frame Beam

The current method of internal force calculation of pre-stressed concrete is based on the principle of pre-stressed continuous concrete beam,but this method does not adapt to the structures of pre-stressed concrete frame,flat plane-beam and so on with peripheral supporting frame which has restrained rigidity.If the structures mentioned above are analyzed by the method,the calculation result and the variation of internal force are not correct and safe and the structures will include incipient fault.Firstly,the per-stressed concrete frame with lateral components of some lateral rigidity is acted as the rsearch objective.The action mechanism of the frame beam is analyzed when the frame columns are restraining on the beam.Then derivation lateral confinement loss of prestress formula down.The distribution and the variation of the pre-stressed efective quantities in the cross section of the beam are comprehensively analyzed by computation along with the variation of the span numbers,span length and linear rigidity ratio of beam to column, wherefore the efect factors and the specific conclusions of lateral restraints on the pre-stressed formation in the concrete beam are drawn.Secondly, the lateral confinement loss of prestress of the per-stressed concrete frame in a project instance can get a result by computation from formula and FEA.Then analyses the feasibility of the lateral confinement loss of prestress toward the preliminary design in practice engineering.At last,the article combines the project instance,while the tube-pillar and the pre-stressed concrete frame beam are tested and analyzed. The factual measures to decrease the influence of lateral restraints on the pre-stressed structure are induced and generalized.The theory foundation and the engineering reference to the project design and construction of the structures with lateral restraints are provided.