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A platform for research: civil engineering, architecture and urbanism
External prestressing structure of continuous steel-concrete composite beam bridge and construction method of external prestressing structure
The invention relates to an external prestressing structure of a continuous steel-concrete composite beam bridge and a construction method thereof, the structure comprises a steel beam and a concrete bridge deck slab, the concrete bridge deck slab corresponding to a middle fulcrum is a hogging moment area concrete bridge deck slab, and the rest concrete bridge deck slabs are sagging moment area concrete bridge deck slabs; prestressed steel bars are arranged below the concrete bridge deck in the sagging moment area of the midspan area and arranged in the longitudinal bridge direction, and the two ends of the prestressed steel bars are connected to bottom plates of the steel beams through anchoring assemblies respectively. The prestressed steel bars are only arranged below the bottom plate of the midspan, the midspan sagging moment is reduced through applying prestress and the primary effect of the steel beams, the steel consumption of the steel beams is reduced, the hogging moment of the middle fulcrum is reduced through the secondary effect of the steel beams, the precompression is applied to the bridge deck, and the steel bar consumption of the concrete bridge deck in the hogging moment area is reduced; and the crack resistance and durability of the concrete bridge deck slab in the hogging moment area can be improved, the primary effect and the secondary effect of the prestressed steel beams are fully utilized, and the utilization efficiency of prestress is improved.
本发明关于一种连续钢‑混组合梁桥体外预应力构造及其施工方法，该构造包括钢梁和混凝土桥面板，中支点对应的混凝土桥面板为负弯矩区混凝土桥面板，其余混凝土桥面板为正弯矩区混凝土桥面板，跨中区域正弯矩区混凝土桥面板下方设有预应力钢筋，预应力钢筋沿纵桥向设置，预应力钢筋两端分别通过锚固组件连接于钢梁的底板。本发明仅在跨中的底板下方设置预应力钢筋，通过施加预应力，钢束一次效应减少跨中正弯矩，减少钢梁钢材用量，钢束二次效应减少中支点负弯矩并对桥面板施加预压力，减少负弯矩区混凝土桥面板的钢筋用量，并能够增加负弯矩区混凝土桥面板的抗裂性和耐久性，充分利用了预应力钢束的一次、二次效应，提高了预应力的利用效率。
External prestressing structure of continuous steel-concrete composite beam bridge and construction method of external prestressing structure
The invention relates to an external prestressing structure of a continuous steel-concrete composite beam bridge and a construction method thereof, the structure comprises a steel beam and a concrete bridge deck slab, the concrete bridge deck slab corresponding to a middle fulcrum is a hogging moment area concrete bridge deck slab, and the rest concrete bridge deck slabs are sagging moment area concrete bridge deck slabs; prestressed steel bars are arranged below the concrete bridge deck in the sagging moment area of the midspan area and arranged in the longitudinal bridge direction, and the two ends of the prestressed steel bars are connected to bottom plates of the steel beams through anchoring assemblies respectively. The prestressed steel bars are only arranged below the bottom plate of the midspan, the midspan sagging moment is reduced through applying prestress and the primary effect of the steel beams, the steel consumption of the steel beams is reduced, the hogging moment of the middle fulcrum is reduced through the secondary effect of the steel beams, the precompression is applied to the bridge deck, and the steel bar consumption of the concrete bridge deck in the hogging moment area is reduced; and the crack resistance and durability of the concrete bridge deck slab in the hogging moment area can be improved, the primary effect and the secondary effect of the prestressed steel beams are fully utilized, and the utilization efficiency of prestress is improved.
本发明关于一种连续钢‑混组合梁桥体外预应力构造及其施工方法，该构造包括钢梁和混凝土桥面板，中支点对应的混凝土桥面板为负弯矩区混凝土桥面板，其余混凝土桥面板为正弯矩区混凝土桥面板，跨中区域正弯矩区混凝土桥面板下方设有预应力钢筋，预应力钢筋沿纵桥向设置，预应力钢筋两端分别通过锚固组件连接于钢梁的底板。本发明仅在跨中的底板下方设置预应力钢筋，通过施加预应力，钢束一次效应减少跨中正弯矩，减少钢梁钢材用量，钢束二次效应减少中支点负弯矩并对桥面板施加预压力，减少负弯矩区混凝土桥面板的钢筋用量，并能够增加负弯矩区混凝土桥面板的抗裂性和耐久性，充分利用了预应力钢束的一次、二次效应，提高了预应力的利用效率。
External prestressing structure of continuous steel-concrete composite beam bridge and construction method of external prestressing structure
一种连续钢-混组合梁桥体外预应力构造及其施工方法
WAN MUCONG (author) / ZENG YONGPING (author) / ZHANG CHAO (author) / SONG SUIDI (author) / REN ZHENG (author) / CHEN KEJIAN (author) / WANG CONG (author) / ZHANG YANG (author) / LI SONGTAO (author) / TAN SHENG (author)
2023-07-21
Patent
Electronic Resource
Chinese
IPC:
E01D
BRIDGES
,
Brücken
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