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某发电厂主厂房预制钢筋混凝土框架结构横向梁,承受上部煤斗的重量,两端支承于框架柱牛腿上。柱跨为12米,梁为凸形,梁高度:中间部分为4400毫米,两端为2700毫米。梁厚为400毫米。梁中部开设(?)1700毫米圆孔,以穿热风管。梁两端箍筋为4φ10@150毫米,中部箍筋为4φ12@300毫米,梁两侧各配腹筋6φ16@500毫米,主筋配7～9φ32钢筋,分两排,混凝土标号为300号,梁中间部位有集中荷载129.5吨,均布荷载19.3吨/米,梁两端均布荷载为7.12吨/米。应力按弹性力学中“有限单元法”采用电子计算机分析,最大正应力σ和最大剪应力τ位于梁的变高截面处,σ为-18.8兆帕,τ为-7.24兆帕。最大主拉应力σ_(zl)为4.5兆帕。
A main plant of a power plant prefabricates the transverse beams of the reinforced concrete frame structure and bears the weight of the upper coal hopper, and both ends are supported on the framing legs of the frame columns. The span of the column is 12 meters. The beam is convex. The height of the beam is 4400 mm in the middle and 2700 mm at both ends. The beam thickness is 400 mm. A (1) 1700mm round hole is opened in the middle of the beam to pass through the hot air duct. The two ends of the beam are 4φ10@150mm, and the middle stirrup is 4φ12@300mm. The two sides of the beam are equipped with 6φ16@500mm web reinforcements. The main steel bars are equipped with 7～9φ32 steel bars in two rows. The concrete number is 300 and the middle of the beams. The site has a concentrated load of 129.5 tons, a uniform load of 19.3 tons/meter, and a uniform load of 7.12 tons/meter at both ends of the beam. The stress was analyzed by the finite element method in the elastic mechanics using a computer. The maximum normal stress σ and the maximum shear stress τ were at the high section of the beam, with σ being -18.8 MPa and τ being -7.24 MPa. The maximum principal tensile stress σ_(zl) is 4.5 MPa.