1、一根简支搁置的钢筋混凝土梁宽50cm,高100cm,跨距6m,单位长度重量12.4KN/m,试判别下列各题:
①自重情况下,梁的路中弯矩两支座处剪力分别为;u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
②在梁的跨中施加50KN集中荷载,则梁跨中弯矩和支座剪力分别为;u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
③在梁的二个三分点处(即距2个支座各2米处)各施加30KN荷载,则梁跨中弯矩和支座剪力分别为。u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
2、某工程对一根长40m的预应力混凝土空心桩进行静载桩试验,要求进行到地基土破坏,桩身截面尺寸为500mm×500mm。空心直径200mm,桩顶和桩端各有2m空心段,预计沉桩最大试验荷载36000KN。u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
①试桩与锚桩之间中心距不得小于()u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
②试验采用快速维持荷载法,每级加载和卸载时间分别为()u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
③各级荷载及桩顶对应沉降见下表u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
荷载KNu¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 600u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 900u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 1200u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 1500u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 1800u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 2100u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 2400u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 2700u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 300u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 3300u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 3600u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
|
沉降mmu¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 2.1u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 3.8u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 5.7u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 8.0u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 10.5u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 13.2u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 16.3u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 19.6u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 23.4u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 44.5u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
| 76.8u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
|
u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
沉桩极限承载力()u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
④试验时采用10根对称布置的锚桩,锚桩尺寸与试桩相同,锚桩主筋采用Φ25钢筋,抗拉强度设计值为310KPa,则每根锚桩至少配置()根Φ25钢筋,写出计算过程。u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
⑥桩的极限端阻力(),写出计算过程。u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
5、某梁跨中载面处测点布置如下图所示,已知ε1=-90με,ε2=-80με,ε3=10με,ε4=100με,ε5=110με,E=30GPa,截面宽b=100mm,截面高h=200mm,求该截面上的轴力N和弯矩Myu¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%
u¼Æ;ï/Þåbbs.3c3t.comã$¶/o(¾H%