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Zhang C.-Y.,Shandong Provincial Transport Planning and Design Institute | Wang W.-B.,China Academy of Railway Sciences | Yao Z.-J.,Shandong Jianzhu University
Bridge Construction | Year: 2014

To study the effect of seismic mitigation and displacement limiting of the E-shape steel dampers and fluid viscous dampers used for long span cable-stayed bridge, a semi-floating system cable-stayed bridge with double pylons and with span arrangement (55+135+400+135+55) m was cited as an example and two damping restraint system schemes for the seismic mitigation and displacement limiting were designed. The dynamic analysis model for the bridge was established by the universal finite element program SAP2000, the rational seismic mitigation and isolation design parameters were determined on the basis of the parametric analysis and three artificial seismic waves were selected to analyze the laws of influence of the two damping restraint system schemes on the seismic responses of the bridge. The results of the analysis indicate that both the selected E-shape steel dampers and fluid viscous dampers can effectively control the horizontal displacement of the main girder of the cable-stayed bridge under the seismic action. When the fluid viscous dampers are used, the increase of bending moment in the pylon footings is relatively little and the effect of the horizontal displacement control of the main girder is relatively good. In consideration of the effect of the seismic mitigation and displacement limiting and the comprehensive service performance of the dampers, the fluid viscous damper scheme is finally recommended for use in the cable-stayed bridge. ©, 2014, Wuhan Bridge Research Institute. All right reserved.


Chen G.-H.,Shandong Provincial Transport Planning and Design Institute | Song X.-L.,Shandong Provincial Transport Planning and Design Institute
Bridge Construction | Year: 2014

The main bridge of the Taohuayu Huanghe River Bridge is a long span self-anchored steel box girder suspension bridge with a main span of 406 m. The suspender and main girder anchorage zones of the bridge are the steel anchor box anchorage structures that are comprised of the anchoring plates, bearing plates and stiffening plates arranged outside the webs of the steel box girder. The plates and members in the anchorage structures are spatially staggered and the force conditions thereof are complicated. To verify the rationality of the force conditions of the anchorage zones, the ANSYS was used to establish the spatial sectional finite element model for the main girder. The force conditions of various plates of the anchorage zones, the force characteristics of the welding seams connecting the anchoring plates and the outer webs of the steel box girder and the spreading law of the suspender cable forces were analyzed and the force conditions of the anchorage zones were hence gained. The results of the analysis show that the suspender cable forces transfer and spread to the whole cross section of the steel box girder via the anchor bands, padding plates, bearing plates, anchoring plates and the webs of the main girder. The stress of the various plates of the anchorage zones can meet the relevant requirements in the codes, the force conditions of the anchorage structures are rational and the transfer of the stress from plate to plate is smooth.


Wang Z.-Y.,Shandong Provincial Transport Planning and Design Institute | Zhang C.-Y.,Shandong Provincial Transport Planning and Design Institute
Bridge Construction | Year: 2015

To improve the seismic performance of long span continuous steel truss girder bridge, the main bridge with span arrangement (102+4×168+102) m of the Changqing Huanghe River Bridge in Ji'nan was cited as an example and in the light of the structural features of the bridge, the friction pendulum bearings were selected for the design of the schemes of whole bridge seismic isolation and continuous pier seismic isolation for the bridge. The spatial finite element model of the bridge was set up by the universal program SAP2000, the model was excited by three artificial seismic waves and the structural responses of the bridge that was not seismically isolated and that was seismically isolated by the friction pendulum bearings were analyzed and compared by the nonlinearity time-history analysis method. The results of the analysis indicate that the friction pendulum bearings for both the schemes of whole bridge seismic isolation and continuous pier seismic isolation can achieve good effect of the seismic mitigation and isolation and can meet the design requirements. As compared to the scheme of whole bridge seismic isolation, the moment of the pier footings and the horizontal displacement of the bearings in the scheme of continuous pier seismic isolation are slightly great, but the scheme is more economic. In comprehensive consideration of several factors of the seismic mitigation and isolation effect, economy and dimensions of the bearings, it is recommended that the friction pendulum bearings with 4 m equivalent sliding radii for the scheme of continuous pier seismic isolation should be adopted for the seismic mitigation and isolation design of the bridge. ©, 2015, Wuhan Bridge Research Institute. All right reserved.


Wang H.-B.,Shandong Provincial Transport Planning and Design Institute | Chen G.-H.,Shandong Provincial Transport Planning and Design Institute
Bridge Construction | Year: 2013

Taohuayu Huanghe River Bridge is a self-anchored steel box girder suspension bridge with double towers and with a main span 406 m. The main cable anchorage section of the bridge is the critical nodal point having multiple functions of the main cable anchoring, main cable force spreading, splay casting and counterweighing. The structure and counterweighing of the anchorage section were designed, the finite element software ANSYS was used to set up the spatial model for the anchorage section and the force conditions of the different plate components in the anchorage section and the force spreading law of the main cables were analyzed. The results of the analysis show that the integral structure of the anchorage section is safe, the grid structure under the anchor in the anchorage section is the critical part transferring tremendous axial forces of the main cables and the axial forces will transfer and spread to the whole cross section of the steel box girder via the anchoring plate, stiffening plate under the anchor, lateral plates and top plate.


Wang Z.-Y.,Shandong Provincial Transport Planning and Design Institute | Xu Z.,Shandong Provincial Transport Planning and Design Institute | Wang M.-X.,Shandong Provincial Transport Planning and Design Institute | Zhao H.-J.,Shandong Provincial Transport Planning and Design Institute | Zhang C.-Y.,Shandong Provincial Transport Planning and Design Institute
Bridge Construction | Year: 2016

The main bridge of Changqing Huanghe River Highway Bridge in Ji'nan is a variable height continuous steel truss girder bridge with span arrangement (102+4×168+102) m. The design schemes for the types of the steel truss girder, main trusses and deck slabs, for the structural system, the composite way of the deck slabs, stringers, cross beams and lower chords of the truss girder as well as for the necessity of arrangement of the panel cross beams and the lateral bracings for the bridge were compared. In comprehensive consideration of the structural strength, stiffness and economy, the scheme for the through continuous steel truss girder bridge was selected and was recommended. In the recommended scheme, 2 main trusses with spacing distance of 27 m are arranged and the main trusses are the triangular trusses with no vertical members. The floor system of the bridge is the system of the concrete deck slabs, stringers and cross beams and the deck slabs are composited with the stringers, cross beams and the lower chords. The upper bracings and portal frames are arranged. The lateral bracings, lower bracings and the panel cross beams are not arranged. Currently, the scheme has been put into practice favorably. © 2016, Journal Press, China Railway Bridge Science. All right reserved.

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