不等间距拼宽T梁桥拼接段传力机理分析  

Force Characteristics Analysis of T Beam Bridge with Unequal Spacing and Splicing Width

作　　者：张诸昌 王明全 曹小龙 王渠[3] ZHANG Zhuchang;WANG Mingquan;CAO Xiaolong;WANG Qu(Xiamen R&B Baicheng Construction Investment Co.,Ltd.,Xiamen,Fujian 361200,China;Anhui Kaiyuan Road and Bridge Co.,Ltd.,Hefei,Anhui 230071,China;College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]厦门路桥百城建设投资有限公司,福建厦门361200 [2]安徽开源路桥有限责任公司,安徽合肥230071 [3]福州大学土木工程学院,福建福州350108

出　　处：《水利与建筑工程学报》2024年第3期119-126,共8页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金资助项目(51808126)。

摘　　要：为了验证广义梁格法计算的精确性,通过空间梁格法分析主梁非等间距拼宽对拼宽直梁桥受力性能的影响,并开展不同拼宽横梁间距对拼宽直梁桥内力横向分布的影响研究。结果表明:拼宽直梁桥广义梁格法计算内力横向分布的结果与空间梁格法计算所得的结果非常接近,各主梁挠度横向分布影响线计算结果最大偏差Δ_(dmax)在10%以内。主梁非等间距拼宽会使拼宽直梁桥的主梁内力横向分配变得不均匀,主梁拼宽间距(bc)<主梁一般间距(b0)时各主梁内力横向分布系数最大值与最小值的差值为0.533,比主梁等间距拼宽的差值大87.0%;bc>b0时各主梁内力横向分布系数最大值与最小值的差值为0.350,比主梁等间距拼宽的差值大23.2%。拼宽直梁桥的拼宽横梁受力性能分析可得:bc0时,拼宽横梁的弯矩影响线数值主要分布在负弯矩区;bc=b0时,拼宽横梁的弯矩影响线数值在正负弯矩区几乎均匀分布,bc>b0时,拼宽横梁的弯矩影响线数值主要分布在正弯矩区。因此在设计计算时,须考虑正弯矩和负弯矩的绝对值的最大值进行设计。On the basis of existing expressways,not only the investment scale is small,but also can meet the growing traffic volume,which is a more reasonable solution to traffic congestion.In this work,the generalized beam lattice method and the space beam lattice method were adopted to verify the accuracy of the calculation method,and the influence of the non-equal space splicing width of main beams on the mechanical performance of splicing width straight beam bridges was also analyzed.The influence of different beam spacing on the transverse distribution of internal forces in straight beam bridges with different width was discussed.The results are as follows.The results of the transverse distribution of internal forces calculated by the generalized beam lattice method are very close to those calculated by the spatial beam lattice method,and the maximum deviation of the influence lines of the transverse distribution of the deflection of each main beam is less than 10%.The non-equispaced width of the main beams will cause the transverse distribution of the internal forces of the main beams of the equispaced straight beam bridge to become uneven.When b_cb_0,the difference between the maximum value and the minimum value of the transverse distribution coefficient of the internal forces of the main beams is 0.350,which is 23.2%larger than the difference between the main beams with equal spacing and width.The mechanical performance analysis of the split-width beam of the split-width straight beam bridge shows that:when b_cb_0,the bending moment influence line values of the splicing beam are mainly distributed in the positive bending moment region.Therefore,in the design calculation,it is necessary to consider the maximum value of the absolute value of the positive bending moment and the negative bending moment.

关 键 词：桥梁工程 桥梁拼宽 直梁桥 广义梁格法 数值分析 受力特性 

分 类 号：TU392.3[建筑科学—结构工程]