论文部分内容阅读
一、前言在《铁路工程技术设计规范·第二篇桥涵》中,对于如何计算梁部结构随外界气温变化和太阳幅射而引起的不均匀温度分布产生的温差应力,尚缺乏明确的规定。然而,沿梁部结构全高引起的不均匀温度分布能产生相当大的温差应力,并已导致在一些预应力混凝土连续梁上产生裂纹,直接影响列车运营,很值得重视。梁部结构的热效应是一复杂的瞬时现象。此现象决定于周围环境的情况,以及梁部结构
I. Preface In the “Technical Specifications for Railway Engineering, Part 2 Bridge and Bridge”, there is a lack of clear stipulations on how to calculate the temperature difference stress caused by the uneven temperature distribution caused by the temperature changes of the beam structure and the solar radiation. However, the inhomogeneous temperature distribution caused by the full height of the beam structure can generate considerable temperature stress and it has caused some cracks in some prestressed concrete continuous beams, which directly affects the train operation. The thermal effect of the beam structure is a complex transient phenomenon. This phenomenon depends on the circumstances surrounding the situation, as well as the beam structure