中文摘要：

为简化横向预应力加固后小铰缝空心板梁桥荷载横向分布系数的计算，针对其加固特点，将加固后的空心板梁桥比拟为正交异性板，并通过纵、横向刚度计算的假设，提出修正的G—M法预测并分析此类加固后桥梁的荷载横向分布；同时分别以2座典型空心板桥为背景，利用所提出的修正G—M法和有限元数值法分别进行分析，并与静载试验数据相对比。结果表明：所提出的修正G—M法计算的荷载横向分布系数与有限元法所得结果平均相对误差在6％以内，与试验值相符；对边梁的计算结果，修正G—M法较试验值大3．9％，有一定安全储备；所提出的修正G—M法合理、可行，可作为计算该类桥梁加固后荷载横向分布的一种简化方法。

英文摘要：

In order to simplify the calculation for lateral load distribution of hollow slab beam bridges strengthened by transverse prestress, based on the features of the strengthened bridges, the slab beams were simulated as orthotropic plates. An assumption was introduced to calculate the longitudinal and lateral stiffness of the simulated orthotropic plates. The modified G-M method was proposed to predict and analyze the lateral load distribution of the strengthened bridges. Meanwhile, two typical hollow slab bridges were taken as examples for analysis with the proposed modified G-M method and numerical finite element method. The analysis results were compared with the static load test data. The results show that the mean error is less than 6 between the lateral load distribution coefficients calculated by the modified G-M method and thatby numerical finite element method and they accord well with the experimental test data~ as for the side beam, the result calculated by the modified method is 3.9 % larger than the experimental result, which gives a considerable safety stock. Thus, the modified G-M method is reasonable and feasible. It provides a convenient and practical way to evaluate the lateral load distribution of transversely strengthened hollow slab bridges.