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4、 () 3()2(BCAaa0l 2 . 1)lh(2 . 1或aa0l 2 . 1)lh(2 . 1或aa0l 2 . 1)lh(2 . 1或0h3.10h3.10h3 . 1抵抗彎矩圖teeqsskcrdcEw08. 09 . 1maxtesskcrdcEw08.09 .1maxcrdcteiiiiieqdndnd2inid01. 0te01. 0tetesteAAeqdsEsktetkf65. 01 . 12 . 02 . 00 . 10 . 10 . 1sk0hAMskskskskANEIMlSEIl8ql485EI384ql5f20202040sB混凝土受彎構(gòu)件的截面抗彎剛度的特點(diǎn)：a.隨荷載的增加而減小b.隨配筋率的降低而減小c.沿構(gòu)件跨度，截面抗彎剛度是變化的d.隨加載時(shí)間的增長而減小在混凝土受彎構(gòu)件的變形驗(yàn)算中所用到的截面抗彎剛度，是指構(gòu)件上一段長度范圍內(nèi)的平均截面抗彎剛度；考慮到荷載作用時(shí)間的影響，有短期剛度Bs和長期剛度B的