钢骨高强混凝土受弯构件非线性分析

Nonlinear Analysis of Flexural Members of Steel Reinforced High-Strength Concrete

为进一步研究钢骨高强混凝土受弯构件的工作性能,通过基于平截面假定的有限条带法,对其在单调荷载作用下的整个受力过程进行分析,计算得到弯矩与曲率、荷载与变形的关系曲线,以及混凝土强度、含钢率对荷载-变形的影响曲线·研究表明,当外荷载为极限荷载的14%左右时,钢骨高强混凝土构件受拉区混凝土开裂;在相同荷载条件下,钢骨高强混凝土构件的延性比钢骨普通混凝土构件的有所降低;在相同变形条件下,随着含钢率的增加,钢骨高强混凝土受弯构件的承载能力得到显著提高·

To investigate further the working performance of flexural members of steel-reinforced high-strength concrete under monotonic loading, a full-range nonlinear analysis is made through the finite ribbon method based on flat section assumption. By computation, the moment-curvature and load-deformation relationships are obtained, as well as those among concrete strength, volumetric percentage of steel, load and deformation of a fiexural member. It is obvious that a concrete member cracks in tensional area as the external load comes to 14% of its ultimate load or so. On the same loading condition the ductility of the member is less than that of conventional steel-reinforced concrete members. However, on the same deformation condition, the bearing capacity of the flexural members of steel-reinforced high-strength concrete increase obviously with the increasing volumetric percentage of steel.