带狗骨式调节器的张弦梁结构的设计与施工

在对张弦梁结构的撑杆与索的连接方式进行探讨的基础上,根据现有张弦梁施工中存在的撑杆竖向精度无法保证的问题,提出解决方法,即采用狗骨式调节器保证撑杆的竖向位置,同时介绍其优点和工作机理;其次对结构进行了静力分析并与实测值进行了比较,得到如下结论:索张力与拱梁起拱值(实测值)在开始阶段呈非线性变化,其后呈线性变化,斜率与理论值基本相等,最后阶段起拱值迅速增大,斜率大于理论值;实际结构的刚度比理论值小;实际结构的狗骨式调节器发挥了保证撑杆竖向位置不动的作用;最后对单榀张弦梁的施工过程予以介绍。

DESIGN AND CONSTRUCTION OF BEAM STRING STRUCTURE WITH ADJUSTMENT OF THE DOG-BONE TYPE

It is introduced a new kind of beam string structure with adjustment of the dogbone type.First it carries on a study on the conjunction methods of strut bar and cable and according to the problem that strut bar's vertical accuracy(can't) be ensured under construction of beam string,it is put forward a settling method that adopted the adjustment of the dog-bone type which assurances strut bar's vertical position and clarifies its advantages and work mechanism.Then it is put forward static theoretical analysis to the structure and compared it with actual measurement.It draws some conclusions such as cable tension and arch spring height is nonlinear variation;after that variation is linear and the slope is equal to theoretical value;at last,spring height increases rapidly and the slope is greater than the theoretic one.Real structure's stiffness is less than theoretical stiffness.The adjustment of the dog-bone type makes full use of vertical position immobility of strut.Finally the construction procedure of the beam string is described.