A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Early crack control method for prestressed concrete cast-in-place continuous box girder
The invention relates to an early crack control method for a prestressed concrete cast-in-place continuous box girder. An early hydration heat temperature field value and early strain value of the continuous box girder are monitored; when the prestressed concrete cast-in-place continuous box girder is subjected to full framing secondary pouring, the pouring time for pouring a bottom plate and a web plate and the pouring time for pouring a top plate and a flange plate are obtained in sequence, the time difference value of the two kinds of pouring time serves as a layered pouring age difference,the optimal layered pouring age difference suitable for the current continuous box girder is obtained, a finite element model of the prestressed concrete continuous box girder is established, and a temperature load curve is fitted; the finite element model which is verified to be correct is utilized, the cast-in-place construction process of the continuous box girder is simulated, the influence of different initial tensioning time and initial tensioning control stress on the early cracking of the top plate of the box girder is evaluated, an optimized initial tensioning construction process with a good control effect on early cracking of the top plate of the continuous box girder is obtained, and the optimized initial tensioning construction process is used for guiding subsequent construction of the continuous box girder.
本发明涉及一种预应力混凝土现浇连续箱梁早期裂缝控制方法，通过监测连续箱梁的早期水化热温度场值和早期应变值，在预应力混凝土现浇连续箱梁采用满堂支架二次浇筑时，先后分别获取浇筑底板和腹板的浇筑时间及浇筑顶板和翼缘板的浇筑时间，以两次浇筑时间差值作为分层浇筑龄期差，得到适用当前连续箱梁的最优分层浇筑龄期差，建立预应力混凝土连续箱梁的有限元模型，拟合温度荷载曲线性；利用已验证正确的有限元模型，模拟连续箱梁的现浇施工过程以及评估不同的初张时间和初张拉控制应力对箱梁顶板早期开裂的影响，得到对该连续箱梁顶板早期裂缝控制效果较好的优化后初张施工工艺，利用该优化后初张施工工艺指导针对连续箱梁的后续施工。
Early crack control method for prestressed concrete cast-in-place continuous box girder
The invention relates to an early crack control method for a prestressed concrete cast-in-place continuous box girder. An early hydration heat temperature field value and early strain value of the continuous box girder are monitored; when the prestressed concrete cast-in-place continuous box girder is subjected to full framing secondary pouring, the pouring time for pouring a bottom plate and a web plate and the pouring time for pouring a top plate and a flange plate are obtained in sequence, the time difference value of the two kinds of pouring time serves as a layered pouring age difference,the optimal layered pouring age difference suitable for the current continuous box girder is obtained, a finite element model of the prestressed concrete continuous box girder is established, and a temperature load curve is fitted; the finite element model which is verified to be correct is utilized, the cast-in-place construction process of the continuous box girder is simulated, the influence of different initial tensioning time and initial tensioning control stress on the early cracking of the top plate of the box girder is evaluated, an optimized initial tensioning construction process with a good control effect on early cracking of the top plate of the continuous box girder is obtained, and the optimized initial tensioning construction process is used for guiding subsequent construction of the continuous box girder.
本发明涉及一种预应力混凝土现浇连续箱梁早期裂缝控制方法，通过监测连续箱梁的早期水化热温度场值和早期应变值，在预应力混凝土现浇连续箱梁采用满堂支架二次浇筑时，先后分别获取浇筑底板和腹板的浇筑时间及浇筑顶板和翼缘板的浇筑时间，以两次浇筑时间差值作为分层浇筑龄期差，得到适用当前连续箱梁的最优分层浇筑龄期差，建立预应力混凝土连续箱梁的有限元模型，拟合温度荷载曲线性；利用已验证正确的有限元模型，模拟连续箱梁的现浇施工过程以及评估不同的初张时间和初张拉控制应力对箱梁顶板早期开裂的影响，得到对该连续箱梁顶板早期裂缝控制效果较好的优化后初张施工工艺，利用该优化后初张施工工艺指导针对连续箱梁的后续施工。
Early crack control method for prestressed concrete cast-in-place continuous box girder
一种预应力混凝土现浇连续箱梁早期裂缝控制方法
WANG FEI (author) / XU AIMIN (author) / LYU ZHONGDA (author) / WANG DONGMEI (author) / ZHAO ZHUO (author) / WANG JIANQIANG (author) / WANG LEI (author) / PENG QIAN (author) / WANG PENGFEI (author)
2020-09-25
Patent
Electronic Resource
Chinese
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