Dynamic behaviors of pretensioned cable AERORail structure

Abstract

The AERORail, a new aerial transport platform, was chosen as the object of this work. Following a review of the literature on static behaviors, model tests on the basic dynamic mechanical characteristics were conducted. A series of 90 tests were completed with different factors, including tension force, vehicle load and vehicle speed. With regard to the proper tension and vehicle load, at a certain speed range, the tension increments of the rail’s cable were proved relatively small. It can be assumed that the change of tension is small and can be reasonably ignored when the tension of an entire span is under a dynamic load. When the tension reaches a certain range, the calculation of the cable track structure using classical cable theory is acceptable. The tests prove that the average maximum dynamic amplification factor of the deflection is small, generally no more than 1.2. However, when the vehicle speed reaches a certain value, the amplified factor will reach 2.0. If the moving loads increase, the dynamic amplification factor of dynamic deflection will also increase. The tension will change the rigidity of the structure and the vibration frequency; furthermore, the resonance speed will change at a certain tension. The vibration is noticeable when vehicles pass through at the resonance speed, and this negative impact on driving comfort requires the right velocity to avoid the resonance. The results demonstrate that more design details are required for the AERORail structure.

Keywords

pretensioned cable / AERORail structure / dynamic behavior / model test / vibration characteristic / dynamic amplification factor / influence line

References

[1] SCHNEIDER J, KOMERSKA R. Compendium of next generation surface transportation alternatives-15th year [EB/OL]. [2011-10]. http://faculty.washington.edu/jbs/itrans/.

[2] Aerobus International Inc. Aerobus is a suspended light rail transit system Houston, Texas USA; [EB/OL] http://www.aerobus.com/ about.html.

[3] SHENR-l, ZHANGD-s, SHENZ-jun. The mechanical properties of the suspension cable structure in aerobus transit system [J]. China Civil Engineering Journal, 2004, 37(4): 13-18

[4] LIF-y, LIUD-j, HANJ-b, CHENX-bo. Structure form of pretension string rail structure and application prospect [M]. Structures and Architecture, 2010Guimarães, PortugalCRC Press427-428

[5] LIF-y, WUP-f, LIUD-jiu. Experimental study on the cable rigidness and static behaviors of AERORail structure [J]. Steel and Composite Structures, 2012, 12(5): 427-444

[6] STRASKYJStress ribbon and cable-supported pedestrian bridges [M], 2005London, UKThomas Telford Ltd.1-247

[7] STRASKYJ. Stress-Ribbon pedestrian bridges supported by arches [J]. Concrete International, 2010, 32(5): 28-33

[8] JIANGY-b, LIY, YANGW-jun. Stiffness changes in full loading process with different failure modes for plane beam string structure [J]. Journal of Central South University (Science and Technology), 2013, 44(7): 3006-3013

[9] ZHANGY-X, LIG-Q, ZHAOS-Feng. Vibration-based cable tension identification of a beam string structure (II): Practical formula and error analysis [J]. Journal of Vibration and Shock, 2009, 28(3): 158-160

[10] ZHANGY-x, LIG-q, ZHAOS-feng. Vibration-based cable tension identification of a beam string structure (I): Parameter analysis of dynamic behavior [J]. Journal of Vibration and Shock, 2009, 28(3): 152-157

[11] XUEW-c, LIUSheng. Design optimization and experimental study on beam string structures [J]. Journal of Constructional Steel Research, 2009, 65(1): 70-80

[12] WANGY-q, GUOZ-x, LUOB, SHIK-rong. Study on the determination method for the equivalent pre-tension in cables of spatial prestressed steel structure [J]. China Civil Engineering Journal, 2013, 46(6): 53-61

[13] LIUM-y, LIC, WANGP-hsii. Dynamic characteristics of the kao ping hsi bridge under seismic loading with focus on cable simulation [J]. International Journal of Structural Stability and Dynamics, 2011, 11(6): 1179-1199

[14] CAIJ-G, HANY-L, ZHAOY-Z, FENGJ, ZHANGJinStudy on the seismic performance of space beam string structures [J], 2010, 42(5): 224-229

[15] LIUB-c, QUB-ningA new idea of the suspending cable cable structure design and the design of the inverse tesnsion cable bridge [J], 1994, 19(4): 83-89

[16] KANGH-J, ZHAOY-Yu. Effects of initial tension on dynamic characteristics of stay cables [J]. Engineering Mechanics, 2010, 27(6): 83-88

[17] BREHMM, ZABELV, CANTIENIR. Model updating of a high-speed railway bridge-modellanpassung einer eisenbahnbrucke fur den hochgeschwindigkeitsverkehr (model updating of a high-speed railway bridge) [J]. VDI Berichte, 2009, 2063: 403-418

[18] WIRIYACHAIA, CHUK H, GARGV K. Impact study by various bridge models) [J]. Journal of Earthquake Engineering & Structural Dynamics, 1982, 10(1): 31-45

[19] DIANAG A. Numerical method to define the dynamic behavior of a train running on a deformable structure [J]. MECCANICA, 198827-42

[20] DIANAG A, CHELIF. Dynamic interaction of railway systems with large bridges [J]. Journal of Vehicle System Dynamics, 1989, 18(3): 71-106

[21] AKIOM. High-speed railway vehicle and bridge interaction [J]. Railway Technical Research Information, 1974, 31(5): 14-17

[22] SENTHILVASANJ, THAMBIRATNAMD P, BRAMELDG H. Dynamic response of a curved bridge under moving truck load [J]. Engineering Structures, 2002, 24(10): 1283-1293

[23] HUANGW-p, QIANGS-zhong. Control of ambient vibration of long span suspension bridge by 2D tuned mass damper [J]. Earthquake Engineering and Engineering Bibratio, 1999, 19(1): 100-103

[24] XUH-a, LIWen. Dynamic behavior of multi-span bridges under moving loads with focusing on the effect of the coupling conditions between spans [J]. Journal of Sound and Vibration, 2008, 312: 736-753

[25] LIUX-p, SUNZ, YANGH, CAIK-h, CHENGJ-yan. Error correction in bridge dynamic displacement monitoring [J]. Earthquake Engineering and Engineering Bibration, 2013, 33(3): 176-182

[26] Ministry of Transport of the People’s Republic of China. Wind-resistant design specification for highway bridges [S]. Beijing, 2004. (in Chinese)

[27] UNITSKYA E. Innovation project “String transport system” [J]. Conversion in Mechanical Engineering, 2000, 2: 59-61

[28] ZHANGN, XIEHe. Dynamic analysis of railway bridge under high speed train [J]. Engineering Mechanics, 2005, 22(3): 144-151

[29] YANGJ-r, BAIY, YANGX-d, FENGYun. Dynamic amplification factor measuring of T-girder bridges [J]. Key Engineering Materials, 2013, 540: 29-36