某电厂贮煤筒仓结构裂缝成因初探

Primary discussion on the crack cause of coal silo structure in a power plant

根据贮煤筒仓结构的有限元计算结果,分别按正常使用极限状态下3种荷载组合工况计算了筒仓结构仓壁下环梁底部的径向应力,以探讨仓壁下环梁底部的裂缝成因。结果表明,在各种荷载组合下,仓壁下环梁底部的径向应力小于C40混凝土的抗拉强度标准值,说明筒仓结构在正常施工和正常使用以及保证混凝土施工质量的前提条件下,仓壁下环梁底部混凝土环向开裂的可能性较小,但仓壁下环梁底部的径向拉应力比较大,接近混凝土的抗拉强度标准值,难以完全保证仓壁下环梁底部混凝土环向不开裂。

Based on the finite element calculation of coal silo structure and considering various load combination conditions under the serviceability limit state,the radial stress at the bottom of the ring beam under the silo wall is calculated according to three combination conditions so as to explore the causes of cracks at the bottom of the ring beam under the silo structure.Results show that the radical stress at the bottom of the ring beam under the silo wall is less than the tensile strength of C40,which is used in the silo structure,under various load combinations.It is state that the crack possibility of the concrete at the bottom of the ring beam of silo wall is smaller in normal construction and normal use and under the precondition to ensure the quality of concrete construction.While radial tensile stress at the bottom of the ring beam is larger,come near the tensile standard strength of concrete,it can’t fully guarantee that the concrete at the bottom of the ring beam cracks.