Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Cantilever construction bridge longitudinal prestress long and short beam division tensioning control method
The invention discloses a cantilever construction bridge longitudinal prestress long and short beam division tensioning control method which comprises the following steps: (1) acquiring bridge longitudinal prestress steel beam parameters and parameter values, changing designed tensioning control stress by +/-alpha%, and calculating steel beam elongation value deviation; (2) calculating the tensilestress deviation caused by the unit length elongation value error of the steel bundle; (3) drawing an L-delta sigma relational graph and carrying out curve fitting, wherein the correlation coefficient should be greater than or equal to 0.98; (4) solving the maximum curvature point or stationary point, namely a critical point, of the fitting curve, and taking the corresponding steel beam length L0as the critical length of long and short beam division; and (5) proposing a prestress tension control criterion based on the critical length as a threshold value. The method has the beneficial technical effects that the influence of the steel bundle length difference on stress control is considered, a prestress critical length division method and a tensioning control criterion taking the criticallength as a threshold value are provided, and technical support is provided for tensioning construction of longitudinal prestress of a cantilever construction bridge.
本发明公开了一种悬臂施工桥梁纵向预应力长短束划分张拉控制方法，包括以下步骤：(1)获取桥梁纵向预应力钢束参数及参数值，将设计张拉控制应力变动±α％，计算钢束伸长值偏差；(2)计算钢束的单位长度伸长值误差引起的张拉应力偏差；(3)绘制L—Δσ关系图并进行曲线拟合，相关系数应大于等于0.98；(4)求解拟合曲线最大曲率点或驻点，即临界点，将对应的钢束长度L作为长短束划分的临界长度；(5)提出基于临界长度为阀值的预应力张拉控制准则。本发明的有益技术效果是考虑了钢束长度差异对其应力控制的影响，提出预应力临界长度划分方法，及以临界长度为阀值的张拉控制准则，为悬臂施工桥梁纵向预应力的张拉施工提供技术支持。
Cantilever construction bridge longitudinal prestress long and short beam division tensioning control method
The invention discloses a cantilever construction bridge longitudinal prestress long and short beam division tensioning control method which comprises the following steps: (1) acquiring bridge longitudinal prestress steel beam parameters and parameter values, changing designed tensioning control stress by +/-alpha%, and calculating steel beam elongation value deviation; (2) calculating the tensilestress deviation caused by the unit length elongation value error of the steel bundle; (3) drawing an L-delta sigma relational graph and carrying out curve fitting, wherein the correlation coefficient should be greater than or equal to 0.98; (4) solving the maximum curvature point or stationary point, namely a critical point, of the fitting curve, and taking the corresponding steel beam length L0as the critical length of long and short beam division; and (5) proposing a prestress tension control criterion based on the critical length as a threshold value. The method has the beneficial technical effects that the influence of the steel bundle length difference on stress control is considered, a prestress critical length division method and a tensioning control criterion taking the criticallength as a threshold value are provided, and technical support is provided for tensioning construction of longitudinal prestress of a cantilever construction bridge.
本发明公开了一种悬臂施工桥梁纵向预应力长短束划分张拉控制方法，包括以下步骤：(1)获取桥梁纵向预应力钢束参数及参数值，将设计张拉控制应力变动±α％，计算钢束伸长值偏差；(2)计算钢束的单位长度伸长值误差引起的张拉应力偏差；(3)绘制L—Δσ关系图并进行曲线拟合，相关系数应大于等于0.98；(4)求解拟合曲线最大曲率点或驻点，即临界点，将对应的钢束长度L作为长短束划分的临界长度；(5)提出基于临界长度为阀值的预应力张拉控制准则。本发明的有益技术效果是考虑了钢束长度差异对其应力控制的影响，提出预应力临界长度划分方法，及以临界长度为阀值的张拉控制准则，为悬臂施工桥梁纵向预应力的张拉施工提供技术支持。
Cantilever construction bridge longitudinal prestress long and short beam division tensioning control method
一种悬臂施工桥梁纵向预应力长短束划分张拉控制方法
SONG ZEGANG (Autor:in) / QU FAXIAN (Autor:in) / YIN JIHUA (Autor:in) / LIU YANLI (Autor:in) / DENG XUDONG (Autor:in) / CHEN XUDAN (Autor:in) / ZOU LEI (Autor:in) / LI JUNJIN (Autor:in) / YUAN BO (Autor:in) / LI YOUHE (Autor:in)
18.08.2020
Patent
Elektronische Ressource
Chinesisch
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