期刊论文

Experimental study on assessment of mechanical performance of prestressed concrete continuous box girder under different cracking conditions

Cao, Guohui(cgfcivil@163.com)

中文

中南大学学报(自然科学版)

1672-7207

2020

51

12

3475-3483

10.11817/j.issn.1672-7207.2020.12.021

湖南省科技计划项目（2006FJ3186）(Project（2006FJ3186）~~；

本校为其他机构

为了对不同开裂状态下预应力混凝土连续箱梁桥的承载能力进行快速估算,对比例尺为1:4的三跨预应力混凝土连续梁模型进行荷载试验,将特征截面(支点、1/4跨、1/2跨截面)混凝土应力、应变及梁体跨中挠度的试验实测结果与弹性计算结果和非线性计算结果进行分析、对比,验证模型桥实测结果的可靠性,并根据这三者的关系得出基于弹性理论估算开裂结构受力状态的修正系数;根据公路桥涵设计规范的裂缝宽度计算公式,取修正系数C_3 = 1.25计算裂缝最大宽度W_(ft),通过各级荷载作用下模型裂缝宽度W_1与 W_(ft)的比值(W_1/W_(ft))和对应的截面弯矩承载率(M_1/M_u)之间的关系,提出裂缝宽度比与承载率的函数关系...

In order to make a quick preliminary estimation for the bearing capacity of the prestressed continuous box girder bridge in different cracking states, through the test on a 1: 4 model, the test results of concrete stress-strain and mid span deflection of beam in characteristic sections(fulcrum, 1/4 span, 1/2 span) were analyzed and compared with elastic calculation results and nonlinear calculation results to verify the reliability of measured results of model bridge, and adjustment coefficients for the estimation of loading state of structures...