Based on the bearing performance of prestressed steel reinforced concrete beam at normal temperature,the simplified calculation formula for the bending bearing capacity of the prestressed steel reinforced concrete beam under high temperatures is established by means of the cross-sectional finite element method.The relationship between the beam bending capacity and the standard heating time during the whole process is obtained.The relationship curve reveals a degradation rule that the bending bearing capacity of the cross section is decreased significantly with the increase of heating time.The comparison between the calculated bending capacity and the measured one shows a good agreement with a relative error of 9.3％.%基于对常温下预应力型钢混凝土梁承载性能的研究,利用截面有限单元法建立了预应力型钢混凝土梁在火灾高温作用下的正截面抗弯承载力简化计算公式.并针对试验梁进行了计算分析,得到了基于标准升温情况下的正截面抗弯承载能力与升温时间的全过程关系曲线,揭示了预应力型钢混凝土梁随着升温时间的增加,其正截面抗弯承载力显著降低的劣化规律.将试验梁抗弯承载力的计算结果与试验实测结果进行了对比分析,相对误差为9.3％.
展开▼
