基于HC温升曲线的T梁抗弯承载能力分析

为研究预应力混凝土T梁在火灾后承载能力随延火时间的变化规律,采用ANSYS建立实体模型,通过施加不同的火灾工况,设计材料在高温下的强度折减,计算不同火灾工况下的抗弯承载力并对其安全性进行评估。结果表明,T梁在桥面受火时承载能力衰减程度低,承载力满足要求;T梁腹板底部及多面受火时,承载能力衰减速率先迅速后缓慢,在一段时间后均不满足要求。

Flexural Bearing Capacity Analysis of T-Beam Based on HC Temperature Rise Curve

In order to study the change rule of bearing capacity of prestressed concrete T-beam after the fire happened,the solid modelis established with ANSYS.Besides,the flexural bearing capacity is calculated and its security is evaluated under different fire conditions according to the strength reduction of materials under high temperature.The results show that the attenuation degree of T-beam flexural bearing capacity is low when the bridge deck is under fire,and the bearing capacity meets the requirement.When the bottom and multiple sides of T-beam web are under fire,the bearing capacity decreases rapidly first and then slowly,which cannot meet the requirements after a period of time.