【正文】 ............................................................................................................ 2 ...................................................................................................................... 2 三、次梁截面 初選 ............................................................................................................ 3 ................................................................................................................... 3 （ 1）腹板高度 hw .................................................................................................... 3 （ 2）腹板厚度 tw..................................................................................................... 3 ............................................................................................................... 3 （ 1）翼緣板面積 ..................................................................................................... 3 （ 2）翼緣板厚度、寬度 .......................................................................................... 4 四、對(duì)初選截面進(jìn)行強(qiáng)度驗(yàn)算 .......................................................................................... 5 ............................................................................................. 5 ................................................................................................................... 5 （ 1）彎曲正應(yīng)力為 ..........................................................................