摘要：
In this paper, the key technologies of construction control of X-type steel box tied arch bridge constructed by full framing are discussed in detail with the Nachaokou Bridge in Xiamen City in China as engineering background. Firstly, simulation the interaction of pile foundation, tie-bar and arch rib in construction process. Secondly, effect of longitudinal gradient is taken into account in simulation calculation of tensioning force of the tie members. Thirdly, the effects of braces deformation and temperature change on assembling location of arch rib were put on much emphasis. Finally, Pre-jacking transverse brace and optimizing procedure of tensioning tie bar is discussed.
作者机构：
[涂光亚; 邵旭东] School of Civil Engineering, Hunan University, Changsha 410082, China;[涂光亚; 颜东煌] School of Bridge and Structural Engineering, Changsha University of Science and Technology, Changsha 410076, China
通讯机构：
School of Civil Engineering, Hunan University, China
关键词：
bridge engineering;cable-stayed bridge;dynamic finite element method;ambient excitation;modal test
摘要：
To study the stiffness distribution of girder and the method to identify modal parameters of cable-stayed bridge, a simplified dynamical finite element method model named three beams model was established for the girder with double ribs. Based on the simplified model four stiffness formulae were deduced according to Hamilton principle. These formulae reflect well the contribution of the flexural, shearing, free torsion and restricted torsion deformation, respectively. An identification method about modal parameters was put forward by combining method of peak value and power spectral density according to modal test under ambient excitation. The dynamic finite element method analysis and modal test were carried out in a long-span concrete cable-stayed bridge. The results show that the errors of frequencies between theoretical analysis and test results are less than 10% mostly, and the most important modal parameters for cable-stayed bridge are determined to be the longitudinal floating mode, the first vertical flexural mode and the first torsional mode, which demonstrate that the method of stiffness distribution for three beams model is accurate and method to identify modal parameters is effective under ambient excitation modal test.
作者机构：
[颜东煌] School of Bridge and Structure Engineering, Changsha University of Sic. and Technol., Changsha 410076, China;[陈政清] Civil and Architectural Engineering College, Central South University, Changsha 410075, China;[陈常松] School of Bridge and Structure Engineering, Changsha University of Sic. and Technol., Changsha 410076, China<&wdkj&>Civil and Architectural Engineering College, Central South University, Changsha 410075, China
通讯机构：
[Chen, C.-S.] S;School of Bridge and Structure Engineering, Changsha University of Sic. and Technol., China
摘要：
On the basis of collecting and arranging datum on coupling vibration of vehicle and bridge, in this paper the motional equations set of vehicle-bridge coupling vibration under the autologous assumption are deduced. What's more making use of Vc++, a professional procedure (CQZD) is programmed which can analyse the vehicle-bridge coupling vibration. Representing the definition of impact coefficient, taking the Bu-Liu River Bridge in GuangXi as subjects, analyses the influencing factor of bridge impact coefficient from vehicle, it includes vehicle quality, bridge basal frequency and so on.
摘要：
If the geometric nonlinear effects are considered in the forward analysis for cable-stayed bridges in the construction period, the determination of controlling parameters for construction control should be a nonlinear iteration process. A method for the calculation of internal forces and deformations of the girders in super-long span cable-stayed bridges has been developed. A steel cable-stayed bridge with the main span of 1088 meters is taken as an example to show the validity of the proposed method.
作者机构：
School of Bridge and Structure Engineering, Changsha University of Science and Technology, Changsha;长沙理工大学 桥梁与结构工程学院 湖南长沙,410076;The Second Navigation Affairs Bureau Engineering of Chinese Harbor, Wuhan 430000, China;中港集团第二航务工程局 湖北武汉,430000
作者机构：
[Hu, Jian-Hua; Liu, Rong; Li, Yu] Hunan Provincial Communication Planning, Survey and Design Institute, Changsha 410008, China;[Yan, Dong-Huang] Changsha University of Science and Technology, Changsha 410076, China
通讯机构：
[Hu, J.-H.] H;Hunan Provincial Communication Planning, Survey and Design Institute, China
摘要：
The construction of bridge must pass the reasonable construction monitoring method to control the condition of internal force and transform aspect in the structural construction of bridge, and makes its final bridge line type and internal force satisfy the demands of design. In this paper, the construction monitoring of the main arch of concrete-filled steel tube of Yiyang Maocaojie bridge and key techniques are presented. The construction monitoring method is established according to the characteristics of concrete-filled steel tube arch bridge constructed in stages. Many influencing factors of concrete-filled steel tube arch bridge constructed in stages are taken into account. The finite element method and modern measurement technologies are employed to analyze the structure and work out the optimal construction plan and its construction technique in order to ensure the stress situations and line shape of the main arch to meet the demands of design. The method of construction monitoring is scientific and the results are satisfied.
