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什么是双筋截面?所谓双筋截面是指不仅受弯构件截面的受拉区配有受拉钢筋,而且在截面的受压区也配有受压钢筋,故称双筋截面。截面的受压区不是有混凝土在承受压应力吗?为什么还要配受压钢筋呢?其原因有:(一)例如有一根连续梁,它有许多跨中和支座截面,这些截面的正弯矩和负弯矩往往是不相等的,对受均布荷载作用的连续梁,一般是边跨跨中正弯矩和从边支座数起的第二个支座上的负弯矩最大,
What is a double-bar section? The so-called double-bar section refers to a double-reinforced section that is not only equipped with tensile reinforcements in the tension zone of the section of the bending member but also equipped with pressed steel bars in the compression zone of the section. Is the compression zone of the section not subject to compressive stress in concrete? Why is it necessary to incorporate compression steel? The reasons are: (i) There is, for example, a continuous beam that has many cross-neutral bearings and cross-sections. The bending moment and negative bending moment are often not equal. For a continuous beam subjected to uniformly distributed loads, the negative bending moment is generally the largest for the positive bending moment of the side span and the second bearing from the side bearing.