钢-混组合连续梁负弯矩区受力性能研究及实用新型装置

钢-混组合梁桥体系在市政桥梁工程中近年得到了广泛应用,尤其是钢-混组合连续梁桥。在正弯矩区混凝土桥面受压,钢梁受拉,能充分发挥材料的优势;但在负弯矩区,混凝土桥面受拉会引起裂缝问题。综合使用超高性能混凝土、预应力技术、调整桥面板施工顺序、有效运用支点顶升法,提出了一种新型装置来控制钢-混组合连续梁负弯矩区拉应力和裂纹。有限元结果表明本装置具有较好的效果。

A Utility Model Device for Steel-concrete Continuous Composite Beams Under Negative Bending

Recently,the steel-concrete composite beam bridge has been widely used in municipal bridge engineering,especially the continuous composite beam bridge.In positive bending regions,the concrete deck is compressed and the steel beam is tensed,while in negative bending regions,the concrete deck is tensed,which will generate cracks.In this paper,a new device is proposed to control the tensile stress in the concrete decks of composite continuous beams under negative bending.The device combines ultra-high performance concrete,prestressing technology,construction sequence adjustment and the fulcrum lifting method.The finite element results have verified the effect of the device.