计算工字形梁的抗弯强度,用公式<imgwidth="45"height="45"id="对象3"src="http://wljy.whut.edu.cn//uploadfiles/word/gcjg002.files/image003.png">≤f,取γx=1.05,梁的翼缘外伸肢宽厚比不小于()。
①
15<imgwidth="35"height="33"id="对象4"src="../uploadfiles/word/gcjg002.files/image002.png">
②
13<imgwidth="35"height="33"id="对象5"src="../uploadfiles/word/gcjg002.files/image002.png">
③
(10+0.1λ)15<imgwidth="35"height="33"id="对象6"src="../uploadfiles/word/gcjg002.files/image002.png">
④
915<imgwidth="35"height="33"id="对象7"src="../uploadfiles/word/gcjg002.files/image002.png">