BEARING CAPACITY OF PRESTRESSED CANTILEVERED GIRDERS WITHOUT BOND, TAKING ACCOUNT OF CONDITIONS DURING THE CANTILEVER CONSTRUCTION OF ROAD BRIDGES
| 项目名称： | BEARING CAPACITY OF PRESTRESSED CANTILEVERED GIRDERS WITHOUT BOND, TAKING ACCOUNT OF CONDITIONS DURING THE CANTILEVER CONSTRUCTION OF ROAD BRIDGES |
| 摘要： | THE SYSTEM TO BE EXAMINED OCCURS FREQUENTLY IN THE CONSTRUCTION OF MASSIVE BRIDGES, ESPECIALLY IF THE BRIDGES ARE BUILT BY MEANS OF THE CANTILEVER METHOD. AN ACCIDENT HAS SHOWN THAT BEARING CAPACITY DURING CONSTRUCTION MAY BE UNDERESTIMATED, AND THE CAUSES OF THIS DECREASE IN SAFETY COMPARED WITH THAT OF THE FINAL STRUCTURE ARE TO BE SOUGHT IN THE FACT THAT (1) THE STATIC SYSTEM DURING CONSTRUCTION IS USUALLY A CANTILEVER ARM, WITH WHICH THERE IS NO POSSIBILITY OF A REDISTRIBUTION OF LOAD; (2) VERY OFTEN A WORKING JOINT HAS TO BE INCORPORATED AT THE MOST HIGHLY STRESSED POINT; (3) IT IS NOT ALWAYS POSSIBLE, BECAUSE OF RAPID PROGRESS IN BUILDING OR BECAUSE OF THE SEASON, TO PRODUCE A BOND WITH THE CONCRETE FOR THOSE PRESTRESSED STEEL INSERTS WHICH CROSS THE WORKING JOINT; (4) BECAUSE OF THE CONSTRUCTION PROCEDURE, STRESSES AT THE ROOT OF THE CANTILEVER ARM DURING CONSTRUCTION ARE SIGNIFICANTLY HIGHER THAN IN THE FINAL STRUCTURE WHEN IT IS SUBJECTED TO PERMANENT LOADS AND TRAFFIC LOADS. IN PARTICULAR THE CONDITION CITED UNDER (3) CAN ONLY BE DETERMINED VERY APPROXIMATELY WITH AVAILABLE KNOWLEDGE. THE OBJECT OF THE RESEARCH IS TO CREATE, UNDER TEST CONDITIONS WHICH REPRESENT THOSE ON A CONSTRUCTION SITE, PRINCIPLES FOR ESTABLISHING THE SAFETY WHICH ACTUALLY EXISTS IN THE CONSTRUCTION CONDITIONS DESCRIBED. |
| 状态： | Active |
| 资助组织： | BUNDESMINISTERIUM FUER BAUTEN UND TECHNIK |
| 项目负责人： | KUENG, R；Rock, S；Geymayer, H |
| 执行机构： | INSTITUT FUER STAHLBETON- UND MASSIVBAU, TU GRAZ (O. PROF. DIPL.-ING. DR. FRITZ BAUER)<==>TECHNISCHE VERSUCHS- UND FORSCHUNGSANSTALT, TU GRAZ (TECHNICAL UNIVERSITY OF GRAZ, INSTITUTE FOR TESTING MATERIALS AND RESEARCH) |
| 开始时间： | 19770000 |
| 主题领域： | Bridges and other structures；Safety and Human Factors；I32: Concrete；I53: Construction of Bridges and Retaining Walls |
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