Prestressed Simply Supported T Beam Effective Prestress Assessment Study

Prestressing force concrete in step highway-bridge of the foot-path occupy leading status while being medium and small structure. It is one of the unknown parameters in battle , the designing value of prestressing force and enormous difference between actual value may influence the service function , will even cause the incident . The test of prestressing force seem particularly essential when being assessed that so Effective in the concrete structure of prestressing forceThis text as 2003 Shaanxi Province traffic scientific and technological project a part on " concrete bridge structure perpetuity prestressing force and security appraisal study in battle " research. Its purpose is to analyse and research through the model pilot system: Emergency , deflection , relation of natural frequency and prestressing force while changing by oneself of the concrete structure of prestressing force, explore the virtual value prediction method of prestressing force. Have certain contacts with some structural mechanics parameters of structure in the concrete bridge perpetuity prestressing force of the battle , for instance emergency of the emergency of the inherent vibration frequency of the structure , deflection , concrete , ordinary reinforcing bar ,etc.To in battle concrete beam bridge , combine experimental condition design two scenes of model test T roof beams according to the whole prestressing force component this text, cloth bunch of prestressing force is assigned the form according to commonly used curve. Exert the greatest loading value of design under the whole prestressing force state to the roof beam of model test under the grade of different prestressing force, carry on the quiet , motive force test through relevant data of natural frequency , deflection , meeting an emergency by oneself etc.. Is it provide T roof beam natural frequency vary with prestressing force law , is it meet an emergency different elastic modulus terms of fetching etc. to survey through test to analyse, is it estimate effective prestressing force to meet an emergency by reinforcing bar , concrete, and to different effective prestressing force with survey piece draw firm prestressing force of the anchor compare and analyse, provide the revision coefficient of prestressing force.This text studies in order to explore the inherent law between perpetuity prestressing force and relevant mechanics behavior parameter, evaluate the foundation of establishing on the structure performance in the prestressing force concrete beam bridge of the battle..