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;åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
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;åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
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。åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
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。åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
①试桩与锚桩之间中心距不得小于()åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
②试验采用快速维持荷载法,每级加载和卸载时间分别为()åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
③各级荷载及桩顶对应沉降见下表åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
荷载KNåWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 600åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 900åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 1200åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 1500åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 1800åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 2100åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 2400åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 2700åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 300åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 3300åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 3600åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
|
沉降mmåWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 2.1åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 3.8åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 5.7åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 8.0åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 10.5åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 13.2åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 16.3åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 19.6åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 23.4åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 44.5åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
| 76.8åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
|
åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
沉桩极限承载力()åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
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。åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
⑥桩的极限端阻力(),写出计算过程。åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
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MyåWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!
åWFYº¨ÂÀybbs.3c3t.comj¶>DQ¼¨F!