Experimental Study On Fire-Resistant Property Of Prestressed SRC Structure

The Prestressed SRC Composite Structure synthetizes the advantage of Prestressed Structure and Steel Reinforced Concrete Structure, So, the prestressed SRC structure can be used to long-span construction, heavy-Loaded-structure, tall building and transfer structure in high-rise Buildings. With the high requirement to the function of the building, the application of Prestressed SRC Composite Structure will be more and more extensive.However, until recently the achievement for Research on Prestressed SRC Composite Structure has been less fruitful, especially in the field of fire research. Based on theoretical analysis and experimental studies, systematical research on fire resistance performance of Prestressed SRC Simply Supported beams are carried out. The main research contents and achievements are summarized as follows:1. The mechanical properties of Prestressed SRC Simply Supported beams are tested under fire and dead load. The distribution of internal temperature and the change of the preloaded pressure of those beams are analyzed. The beam's mechanical performance in the high tempreture is revealed by experiments.2. The heat transfer process of Prestressed SRC Simply Supported beams are analyzed by means of finite element analysis software ABAQUS, under the rising temperature curve by experiments. The distribution of internal temperature of the pre-stressed concrete simple-supported beam is achieved at any time, which are compared with the test results.3. The three side in fire heat transfer process of concrete members are carried out by ABAQUS,which have different sectional dimension,and the formula of the position of 300℃and 800℃isothermal line put forward by those results.4. Based on reasonable assumption and two steps model to calculate strength of Prestressed SRC structure under high temperature, it puts forwards the formula of the flexural carrying capacity of the Prestressed SRC Simply Supported beam in the fire using the effective section method,which the results agree well with the tested ones.