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一、铁路桥涵设计规范§276条表(37)的来源及使用条件。一般砖石及混凝土结构中心受压杆件的从向挠曲稳定(即第一类稳定)都以表(37)的应力折减系数来计算,为此本文首先谈表(37)的来源及使用条件。一般中心受压等截面直杆的纵向挠曲稳定,H’K.斯尼特科在“杆系的稳定性”(建筑工程出版社)一书中称之为第一类稳定。有的书中也叫直杆的轴线位置稳定。其物理意义是中心受压直杆(如图1),在外力P增加时始终是中心受压的。当P增大到某
First, the design specifications of the railway bridge Culvert §276 table (37) of the sources and conditions of use. In general, the flexural stability (that is, the first kind of stability) of the rod subjected to the pressure in the center of the masonry and concrete structure is calculated by using the stress reduction coefficient of the table (37). To this end, Conditions of Use. The general center is subject to compression and other cross-section vertical bar bending stability, H’K. Snitko in the “Stability of Poles” (Architectural Engineering Press) book called the first kind of stability. Some books, also known as straight rod axis position stable. Its physical meaning is the central pressure of the straight rod (Figure 1), P increases in the external force is always the center of compression. When P increases to some