The high-temperature mechanical properties of Aluminum conductors steel-reinforced strands are the fire resistance of the prestressed structure and the research purpose of this research: six. Before copying, the 32 m simply supported continuous prestressed concrete T-beam bridge, the highway is due to the construction of the beam steel core negative bending moment prestressed steel The twisted wire is damaged by mistake. The bridge has not yet been submitted to traffic, and its damage to the bridge structure is not clear. The impact of the contractor’s aluminum strand is on the quality of the bridge and the safety of post opera.
Research conclusion: In this article, the finite element software ANSYS9.0 is used to model, the lanes and highways are loaded horizontally, and the calculation and analysis of the nine construction stages are used. Different interrupt deflection, interrupted edge stress and bearing stress change are used to change the edge of the cross section. Three indicators of the negative bending moment of the beam are used to evaluate the damage of the prestressed steel strands that affect the bridge structure.
Through calculation, the negative steel core bending moment of the side beams of the prestressed steel strands damages the bridge structure, and the only support position against the wall may be the concrete cracking. A new type of ACSR cable type falling beam negative bending moment prestressed steel beam device to prevent damage, the impact of the bridge structure after fire, the basis for structural damage identification and evaluation, the steel chain wire on the same side of the steel core aluminum strand Intercepting 16 wires in high temperature tensile test specimens, passing the tensile force-displacement curve, stress-strain curve and yield strength, ultimate strength, proportional limit, linear modulus of elastic aluminum strand and the experimental temperature of the high-temperature wire sample Steel core.
Not only with construction methods, and related concrete materials and surrounding environment. Many studies have shown that the actual pressure and tension of the prestressed steel strands are different in this process. The reason is that the friction of the surrounding materials that affect the tension of the steel strands is caused by the construction technology. limits.
The prestress test method is mainly used for analysis. The example of Caohe aqueduct introduces in detail an in-situ test method suitable for complex construction conditions. The test results show that the stress-strain and temperature of the prestress loss steel strands at high temperatures The relationship curve tends to be flat, and the ACSR conductor rises slowly, and the mechanical properties return with the temperature rise. The experimental results of the research put forward the calculation and analysis of the fire resistance of the prestressed structure to provide a reference.