Novel steel-UHPC combined continuous beam structure and construction method thereof: Fid-Bau Portal

Novel steel-UHPC combined continuous beam structure and construction method thereof

CHEN KANGMING / WU QINGXIONG / CHEN PENG / YANG YILUN

The invention belongs to the technical field of steel-concrete composite bridges, and particularly relates to a novel steel-UHPC composite continuous beam structure and a construction method thereof. The UHPC prefabricated slab unit, the steel-concrete cast-in-place slab unit and the UHPC cast-in-place slab unit are arranged on the supporting steel beam unit, so that the UHPC cast-in-place slab unit is only arranged on the upper portion of the hogging moment area, it is guaranteed that the tensile property is relatively sufficient, and the UHPC consumption is relatively small; and 2, the bottom of the whole bridge is provided with the UHPC prefabricated slab unit with relatively small thickness, so that the bridge obtains an optimal balance among the structural strength, the construction efficiency and the comprehensive cost.

本发明属于钢‑混组合桥梁技术领域，尤其涉及一种新型钢‑UHPC组合连续梁结构及其施工方法。本发明通过在支撑钢梁单元上设置UHPC预制板单元、钢混现浇板单元，以及UHPC现浇板单元的方式，使得：1、UHPC现浇板单元仅设置在负弯矩区域的上部，保证抗拉性能相对足够，且UHPC用量相对较少；2、整个桥梁的底部都是厚度相对较小的UHPC预制板单元，使得该桥梁在结构强度、施工效率和综合成本之间获得一个最佳的平衡。

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