Through the finite element simulation on beam monotonic loading test of 15 steel reinforced concrete beams（only changed the built-in steel flange width）,from the finite element computed results and theoretical analysis,gained the top flange width and the bottom flange width ratio of 0.7~0.8 of steel reinforced concrete beam structure built-in steel,to core concrete had an efficient constraint,while the core area concrete to built-in steel flange had effective support,and the built-in steel,reinforcing steel and concrete could all give full play to their mechanical properties,namely to achieve the best economic mode.%通过对15个型钢混凝土梁构件（只改变内置型钢上翼缘宽度）的梁中单调加载试验进行有限元模拟,从有限元的计算结果以及理论分析得出,型钢混凝土梁构件内置型钢的上翼缘的宽度与下翼缘之比为0.7～0.8时,对核心区混凝土有高效约束,同时核心区的混凝土对内置型钢翼缘有有效的支撑,并且内置型钢、钢筋和混凝土都能充分发挥其力学性能,即达到最佳经济模式。
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