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3.确定基础宽度例1:图6为黑龙江省某地区农村住宅楼,屋面为粘土瓦屋面,楼板为10厘米厚现浇钢筋砼板。经勘察,地基为弱冻胀粘性土,容许承载力为[R]=12T/m~2,最大冻结深度为2米,求基础宽度B。 (1) 荷载计算 a.屋面荷载:如图7 粘土瓦 55kg/m~2 挂瓦条 (0.04×0.04×1×500)/(0.3×1)=3kg/m~2 椽条 (0.05×0.08×500)/(0.7×1)=3kg/m~2 檩条 (0.06×0.12×1×500)/(2.3×1)=2kg/m~2
3. Determine the base width Example 1: Figure 6 is a rural residential building in a certain area of Heilongjiang Province. The roof is a clay tile roof and the floor slab is a 10 cm thick cast-in-place reinforced concrete slab. After investigation, the foundation is a weakly frost-swelling cohesive soil, the allowable bearing capacity is [R]=12T/m~2, the maximum freezing depth is 2 meters, and the base width B is obtained. (1) Calculation of load a. Roof load: As shown in Fig. 7: Clay tile 55kg/m~2 Wall tile (0.04×0.04×1×500)/(0.3×1)=3kg/m~2 Concrete (0.05×0.08) ×500)/(0.7×1)=3kg/m~2 檩 bars (0.06×0.12×1×500)/(2.3×1)=2kg/m~2