Arrangement method of supports of continuous box girder bridge
A technology of bearing and plane layout, applied in the direction of bridges, bridge parts, bridge construction, etc., can solve the problems of reducing the thrust stiffness of bridge piers, and achieve the effect of increasing the cost.
Inactive Publication Date: 2013-09-25
河南省新开元路桥工程咨询有限公司
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Problems solved by technology
The disadvantages of this arrangement method are: ① Some bridge piers are installed with sliding bearings and will not slide, and the sliding bearings do not play their due role; ② Due to the installation of sliding bearings, the thrust stiffness of the bridge piers is reduced
Method used
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Embodiment 1
[0040] Example 1 The Mangshan interchange E-ramp bridge in the Yongcheng section of the Jining-Qimen Expressway is a 4-16 continuous box girder bridge with a width of 10.5m and piled piers. The heights of the three middle piers are 8.5m and 9m respectively. , 9.5m, and column diameter is 1.3m. The dead-load support reaction forces of piers No. 0 to No. 4 in the calculation book are 1619kN, 4395kN, 3937kN, 4875kN, and 1893kN respectively.
[0041] (1) The thrust stiffness of each pier
[0042] Calculation according to Appendix P of "Code for Design of Highway Bridge and Culvert Foundation and Foundation" (JTG D63-2007):
[0043] EI=3.1404×10 6 kN·m 2
[0044] =1.0543×10 -5 m
[0045] =2.2313×10 -6 rad
[0046] =2.2313×10 -6 m
[0047] =7.6434×10 -7 rad
[0048] n=2
[0049]
[0050]
[0051] =1.44×10 4 kN / m
[0052]
[0053] =1.27×10 4 kN / m
[0054]
[0055] =1.13×10 4 kN / m
[0056] (2) Calculate the fixed point S.P. (Stagnant Point) ...
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The invention relates to a planar arrangement method of supports of a continuous box girder bridge. The planar arrangement method comprises the following steps: calculating anti-thrust rigidities at the tops of bridge piers according to the geological conditions at the positions of the bridge piers and the lower structures of the bridge piers, calculating a stationary point (S.P.) of a box girder according to the anti-thrust rigidity of each pier, calculating horizontal force at the top of each pier according to constant-load support reaction force R at the top of each bridge pier, calculating the maximum horizontal displacement at the top of each bridge pier when the supports slide, calculating shrinkage deformation amount of each bridge pier, arranging a fixed support at the bridge pier which is closest to the stationary point (S.P.), if the other bridge piers meet the condition, arranging fixed support saddles at the other bridge piers; otherwise, arranging one-way sliding supports. According to the method disclosed by the invention, the longitudinal anti-thrust capability of a large longitudinal slope bridge can be improved, the resisting force of the bridge piers can be indirectly improved, the transverse position-limiting capability of the bridge can be improved by 2-4 times, and the transverse slippage of a curved bridge and a large transverse slope box girder can be effectively prevented; and a stress system of the original structure and the bearing force of the supports are not changed in the method, the stress system can be effectively utilized, and the cost is not increased.
Description
technical field [0001] The invention relates to the field of bridge construction, in particular to a support plane arrangement method of a continuous box girder bridge. Background technique [0002] Bridges move under the action of temperature changes, elastic strains caused by various loads, especially traffic loads. In ancient times, bridges were built of stone, brick or wood. The expansion and contraction of most stone bridges was little affected by temperature fluctuations. The wooden bridges were small in scale and had natural cracks. The expansion and contraction of the entire bridge was scattered due to the expansion and contraction of each part. Therefore, the ancient bridge can have no support. But in modern times, with the use of steel structures and later reinforced concrete and prestressed concrete, bridge bearings have been widely used. [0003] Bridge supports are generally divided into fixed supports and movable supports. The fixed supports not only fix the ...
Claims
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IPC IPC(8): E01D21/00E01D19/04
Inventor 赵运输林宪广庞广彬刘鸿韬杨阳胡艳霞何瑞玺秦伟峰温俊魁刘志磊
Owner 河南省新开元路桥工程咨询有限公司