摘要
为进一步研究预应力钢骨混凝土梁的工作性能,运用有限条带法,考虑材料非线性,编制计算程序,对其在单调荷载作用下的整个受力过程进行分析。计算得到预应力与普通钢骨混凝土梁在开裂阶段、屈服阶段、极限阶段的荷载、位移值,及混凝土强度、含钢率、有效预应力、非预应力筋配筋率对预应力钢骨混凝土梁荷载—变形关系的影响曲线。结果表明,对钢骨混凝土梁施加预应力,能显著提高构件的开裂承载力和极限承载力,但其延性有所降低;混凝土强度等级越高,梁的开裂承载力和极限承载力越大;含钢率越大,截面刚度越大,构件承载力提高越明显;开裂前阶段,非预应力筋配筋率对构件承载力的影响较小,开裂后,非预应力筋配筋率越大,梁的极限承载力越大。
To research more deeply,the bearing analysis under the monotone load are preceded by using finite ribbon method.Some calculation results are obtained,such as,load value and displacement value of prestressed and non-prestressed steel reinforced concrete beam in crack stage,yield stage and damage stage,as well as the curves about how concrete strength,volumetric percentage of steel,prestress,volumetric percentage of reinforced bars affect moment-curvature curves of prestressed steel reinforced concrete beam.The results shows that the crack capacity and ultimate capacity of steel reinforced concrete beam can be improved highly if prestress to it,but its ductility will be degraded.And the higher concrete strength,the greater the crack capacity and ultimate capacity;the higher the volumetric percentage of steel,the greater section stiffness and capacity;before cracking,volumetric percentage of reinforced bars affects the capacity of prestressed steel reinforced concrete beam little,after that,the higher volumetric percentage of reinforced bars,the greater ultimate capacity.
出处
《四川建筑科学研究》
北大核心
2010年第6期35-38,共4页
Sichuan Building Science
基金
辽宁省教育厅基金资助项目(2009A441)
关键词
预应力
钢骨混凝土
梁
非线性分析
荷载—变形曲线
prestress
steel reinforced concrete
beam
nonlinear analysis
moment-curvature curve
