中文摘要：

现代大型桥梁的建设，面临的施工环境越来越复杂，其中，山区桥梁的建设，问题显得尤为突出，山区不但地质情况复杂，而且风环境也多样，风荷栽常常是桥梁施工中极其重要的荷载，有时还可能成为控制因素，因此，桥梁施工时风场模拟和风荷载计算显得尤为重要，鉴于现在风场实验条件的局限性。也为了节省投资，风场的数值模拟显得十分必要，也是1种更为经济的方式，以马迹塘大桥为例，对其周边的环境进行了风场模拟，得到了其三分力系数，并在假定某一入口风速的情况下，对其施工中主塔的位移进行了计算。

英文摘要：

The increasingly complex construction environment have been faced in the construction of large modem bridge. Especially the construction of the mountainous terrain bridge, because of not only the complex geological conditions, but also a wide variety of wind environment. The wind load is often the vital loads in the course of construction, and sometimes become the control load. Therefore, the wind field simulation and the wind load calculations are particularly important in the course of construction, Given the limitations of the experimental conditions of the wind field simulation, and it is also to save investment. The numerical simulation of the wind field is necessary, and also a more economical ways. This paper takes the Majitang Bridge as an example, and it simulates the wind environment. The aerodynamic coefficients of three directions have been got. The displacement of the main tower, in the course of the construction, has been calculated, by assuming an inlet velocity.