Complex force pattern and mechanical simulation analysis of Block 0 of the main pier of continuous variable section box girder
A continuous variable section box girder is the widely used type of steel box girder bridge,which has the characteristics of complex force and difficult construction deformation control.This paper relies on the project of Baigou River Special Bridge on the Jing-Xiong Expressway Gaobeidian link of the backbone road network of Xiongan New Area,in combination with steel box girder structure of the anisotropy structure design theory,the linear monitoring,millimeter wave radar monitoring,stress-strain gauge monitoring and numerical simulation analysis method,toobtain the stress and deformation data of Block 0 of the main pier of continuous variable section box girder,The working mechanism of complex stress mode of Block 0 of the main pier of continuous variable section box girder is obtained.The results show that:1)for linear monitoring,internal stress monitoring,and millimeter wave radar monitoring,the control threshold range of zero blocks of the main pier of continuous variable section box girder was proposed,the internal stress variation range is 0.71～12.58 MPa,and the settlement amount is 0.78～-0.2 mm;2)the data of linear monitoring and internal stress monitoring were compared and analyzed,and the fitting regression was carried out to construct the deformation stress model of the main pier blocks;3)by extracting the millimeter wave radar spectrum of the main pier zero block and obtaining data on abnormal deformation points,the instability failure mechanism of the main pier zero blocks of continuous variable section box girder was analyzed.The above research results can provide theoretical support and technical guidance for optimization of design parameters,construction quality control,and construction process optimization of Block 0 of the main pier of contionuous variable section box girder.
万方数据
维普
