四、楼盖设计例题(国外英文资料).docVIP

四、楼盖设计例题(国外英文资料) The design of the frame of the frame of the plate is designed The floor cover of a multi-storey industrial building is shown in figure 8-21. The floor is covered with concrete and concrete frame, and the design of the building is tried.  Figure 8-21 floor plan (1) information  as follows Method: 20mm thick cement mortar, concrete and concrete, 20mm thick lime mortar. The standard value of the living load is 8kN/m2.  Material: the concrete is C20, the inner strength of the beam is using HRB335, other steel bar HPB300.  (2) structural layout and selection of component section size  Structure layout as shown in figure 8-22, namely main girder span is 6 m, secondary beam span of 4.5 m, span of 2.0 m, each girder cross arranged in two secondary beam, to make it more gently bending moment graphics.   Determine thickness: industrial floor demands h 70 mm or more, and for continuous board also requires 40 h p/l = 50 mm, considering the variable load is bigger and the vibration load, the influence of h = 80 mm.  To determine the section size of the sub-beam: h = l / 18 ~ l / 12 = 250 ~ 375mm, considering the large living load, the h = 400mm, b = (1/3 ~ 1/2) h is approximately 200mm.  Determine the section size of the main beam: h = (1/15 ~ 1/10) l = 400 ~ 600mm, h = 600mm, b = (1/3 ~ 1/2) h = 200 ~ 300mm, take b = 250mm.  (3) the board design  The ratio of the length of the plate edge is 3 or greater l2 / l1 = 4500/2000 = 2.25 2 or higher, and the calculated results is designed according to the one-way slab along the long side direction of steel increases, the one-way slab by considering the plastic internal force redistribution of internal force calculation method. Figure 8-22 structure floor plan 1)  load calculation Constant load standard value: 20mm cement mortar surface layer 0.02 x 20 = 0.4 kN/m2 80mm reinforced concrete plate 0.08 x 25 = 2.00 kN/m2 The mortar of lime mortar at 20mm is 0.02 x 17 = 0.34 kN/m2 Subtotal 2. 74 kn/m2  live loa