钢与高强混凝土连续组合梁非线性分析

Study on Performance of Steel-High Strength Concrete Continuous Composite Beams

目的研究钢与高强混凝土连续组合梁的受力性能,为组合梁设计提供依据.方法采用ANSYS通用有限元软件,考虑材料非线性,提出一种钢与高强混凝土连续组合梁从加载到破坏的全过程非线性分析模式,对钢与高强混凝土连续组合梁进行分析.结果得到组合梁的荷载-变形规律;交接面滑移分布规律;交接面掀起分布规律.结论钢与高强混凝土连续组合梁的荷载-变形曲线同样经历弹性、弹塑性和塑性三个阶段;滑移最大值发生在两加载点之间,提高混凝土强度、增加连接件刚度可以有效减小连续组合梁交接面相对滑移;在连续组合梁的负弯矩区,交接面的竖向掀起比较平缓,在距两侧梁端L/4(L为单跨长)范围内,连续组合梁的竖向掀起较大,提高混凝土强度,可以有效减小交接面竖向掀起.

Based on the ANSYS procedure, a nonlinear full-range analytical mode on the steel-high strength concrete continuous composite beams was presented in view of characters of composite beams and nonlinear of materials. Steel-high strength concrete continuous composite beams were studied with the nonlinear procedure. The deformation and interface slide and lift of steel-high strength concrete continuous composite beams were researched. As a result the corresponding rules were obtained. The deformation curve of steel-high strength concrete continuous composite beams also involves elasticity, elastic-plasticity and plasticity phases. The maximum of slide deformation occurs between the two loading points, and not only the enhancement of concrete strength but also the increase of connector rigidity can diminish the interface relative slide of continuous composite beams efficiently. In the negative moment region the vertical lift of interface is relatively gentle, which the vertical lift of continuous composite beams is biggish between L/4 （L is single span length. ）distance from each end and each end. So the enhancement of concrete strength can diminish the interface relative slide in effect.