超高性能轻型组合桥面设计指标近似计算方法

Approximate Calculation of Design Indices for High-Performance Lightweight Composite Bridge Decks

在有限元建模的基础上,通过正交试验设计,分别得到UHPC层最大拉应力、表面局部挠跨比和栓钉最大剪应力等结构设计指标的关键影响因素.采用拉丁超立方抽样方法,探究结构设计指标与各自的关键因素之间的内在联系,建立UHPC最大拉应力、表面局部挠跨比和栓钉最大剪应力的近似计算公式.对近似计算公式进行统计检验、经验判断及足尺模型、推出模型试验检验.研究表明:本文提出的设计指标近似计算公式,其线性相关与回归效果显著,且定性分析与一般工程经验相符,3个指标计算值与试验实测值的相对误差小于10%.

For the purpose of engineering application of High-Performance Lightweight Composite Bridge Decks, it was necessary to study the approximate calculation method of structural design indices. On the basis of finite element modeling, orthogonal tests were designed to obtain the key factors influencing the maximum tensile stress of UHPC,the ratio of local deflection on bridge deck,and shear stress of stud. The Latin hypercube sampling method was used to find out the internal relations between structural design indices and their key factors. Approximate calculation formulas of the maximum tensile stress of UHPC, the ratio of local deflection , and shear stress of stud were presented, which were examined by statistical tests ,judgments based engineering experiences- full-scale model tests and push-out model tests The results show that the linear correlations and regression effects of the formulas were significant, and the qualitative analysis were consistent with the general engineering experiences. The relative error between the calculated value of the three indexes and the measured value is less than 10%. They are of good applicability.