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["混凝土强度和模量"]
["强度","fck","ftk","fc","ft","Ec","Ecf"]
["类型","N/mm2","N/mm2","N/mm2","N/mm2","N/mm2","N/mm2"]
["C15",10,1.27,7.2,0.91,22000]
["C20",13.4,1.54,9.6,1.1,25500,11000]
["C25",16.7,1.78,11.9,1.27,28000,12000]
["C30",20.1,2.01,14.3,1.43,30000,13000]
["C35",23.4,2.2,16.7,1.57,31500,14000]
["C40",26.8,2.39,19.1,1.71,32500,15000]
["C45",29.6,2.51,21.1,1.8,33500,15500]
["C50",32.4,2.64,23.1,1.89,34500,16000]
["C55",35.5,2.74,25.3,1.96,35500,16500]
["C60",38.5,2.85,27.5,2.04,36000,17000]
["C65",41.5,2.93,29.7,2.09,36500,17500]
["C70",44.5,2.99,31.8,2.14,37000,18000]
["C75",47.4,3.05,33.8,2.18,37500,18500]
["C80",50.2,3.11,35.9,2.22,38000,19000]

{"sheet":"钢筋强度和模量","index":1,"n_rows":9,"n_cols":6,"rows_kept":9,"merged":[[0,0,0,5],[8,0,20,10]],"flags":["formulas_cached_only"]}
["钢筋强度和模量"]
["强度","直径","fyk","fy","fy'","Es"]
["类型",null,"N/mm2","N/mm2","N/mm2","N/mm2"]
["HPB235","8~20",235,210,210,210000]
["HRB335","6~50",335,300,300,200000]
["HRB400","6~50",400,360,360,200000]
["HRB400","8~40",400,360,360,200000]
[]
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