单箱多室波形钢腹板简支箱梁偏载系数简化计算方法

A Simplified Calculation Method for Eccentric Load Coefficient of Simply Supported Single-box Multi-cell Girder with Corrugated Steel Webs

为了得到单箱多室波形钢腹板简支箱梁偏载系数的简化计算方法,用刚性横梁法推导了单箱多室波形钢腹板箱梁荷载横向分布系数的计算公式,通过有限元建模计算单箱多室波形钢腹板箱梁的偏载系数,并对影响偏载系数的因素进行参数敏感性分析。基于偏载系数与荷载横向分布的关系,提出偏载系数的简化计算公式,利用该公式对某工程实例进行了偏载系数计算。结果表明,影响正应力偏载系数及剪应力偏载系数的最主要因素是宽跨比,提出的偏载系数简化计算公式适用于不超过5室,单室宽度与跨径比介于0.08~0.24的单箱多室波形钢直腹板箱梁正应力偏载系数及剪应力偏载系数的求解。

In order to get a simplified calculation method for eccentric load coefficient of simply supported single- box multi-cell girder with corrugated steel webs, a formula for calculating the load transverse distribution coefficient of single-box multi-cell girder with corrugated steel webs is derived with rigid beam method. The eccentric load coefficient of the girder is calculated by the established FEM model,and the parameter sensitivity analysis of the influencing factors of eccentric load coefficient is also performed. Based on the relation between eccentric load coefficient and transverse load distribution,a simplified method for calculating the eccentric coefficient is proposed,which is used for calculating the eccentric load coefficient for an engineering example. The result shows that（ 1） the width-span ratio is the most important influencing factor for the eccentric load coefficients of normal stress and the shear stress;（ 2） the proposed simplified formula is suitable for calculating the eccentric load coefficients of the normal stress and shear stress of the single-box multi-cell girder with corrugated steel webs which is less than 5 cells and each cell width-span ratio between 0. 08- 0. 24.