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针对预应力荷载效应的等效荷载法不完全适用于桥梁工程实际情况,从等效荷载法假设的不足——仅适用于索曲线近似视为二次抛物线,且曲率平缓的情况出发,根据材料力学的基本原理,不限曲率变化,从理论上详细推导了抛物线、圆曲线、直线及上述几种线形组合布置的索曲线的荷载效应计算公式。同时得到了斜率变化在满足工程精度要求,即5°范围内的简化计算公式。结合深梁曲线预应力荷载效应和箱梁0#块曲线预应力荷载效应的工程算例,采用解析法公式进行分析,并用ANSYS软件进行模拟计算。计算结果表明,两者最大误差小于5%,验证了针对上述几种线形的荷载效应计算公式是正确有效的。
Equivalent load method for prestressed load effect is not fully applicable to the actual situation of bridge engineering. From the assumption of equivalent load method, it is only applicable to the case where the curve of the curve is approximated as a quadratic parabola and the curvature is gentle. Based on the material The basic principle of mechanics and the change of curvature are not limited. The formulas for calculating the load effect of the curve of parabola, circular curve, straight line and the combination of the above several linear arrangements are deduced theoretically in detail. At the same time, a simplified calculation formula of the slope change within the range of 5 ° is obtained, which meets the requirement of engineering accuracy. Combined with the prestressed load effect of deep beam curve and the engineering example of prestressed load effect of # 0 block curve in box girder, the analytic formula is used to analyze and calculate with ANSYS software. The calculation results show that the maximum error between the two is less than 5%, which verifies that the formulas for calculating the load effects of the above linear shapes are correct and effective.