Simplified Calculation Method of Pedestrian Suspension Bridge under Vertical Load

HU Xibing, XIANG Siyu, FANG Hui, YUAN Zhishen

Abstract

In order to solve the tediously calculative problem of deflection and finite element analysis of the pedestrian suspension bridge under vertical load, a simplified calculation method was proposed by considering the flexible structure of pedestrian suspension bridge, neglecting the stiffness of the stiffening beam, and considering the IP displacement of the main cable, the cable sag effect, and the geometric nonlinearity. The stress-free length and midspan deflection of bridge main cables with different spans and different rise-span ratios were calculated, and the application scope and error of the simplified calculation method were analyzed based on the results of the trial calculation. The calculation accuracy and application scope of the method were verified. Taking a pedestrian suspension bridge with a span of 117 m as an example, the mechanical properties of the suspension bridge under completed and vertical load state were analyzed by the calculation method in this paper, and compared with the results of finite element analysis and test. The results show that the simplified calculation method proposed has good practicability and can provide a reference for the rapid solution and verification of finite element analysis result of pedestrian suspension bridges in practical engineering.

 

 

Keywords:  pedestrian suspension bridge,  geometric nonlinearity,  simplified calculation method,  rise-span ratio,  deflection calculation


Full Text:

PDF


References


WANG Z B. Design of cable systems of Zhangjiajie grand canyon glass floor bridge[J]. Bridge Construction，2017，47 (3)：83—87 (In Chinese)

CAO G H，HU J X，ZHANG K，et al. Geometrical non -linear characteristic of flexible suspension bridge [J]. Journal of Central South University (Science and Technology)，2014，45 (2)：615— 621 (In Chinese)

WANG X L，CHAI S B，XU Y. Deformation characteristics of multi- tower suspension bridges [J]. Journal of Beijing University of Technology，2018，44 (6)：897—903 (In Chinese)

Choi D H，GWON S G，HOON Y，et al. Nonlinear static analysis of continuous multi-span suspension bridges [J]. International Journal of Steel Structures，2013，13 (1)：103—115.

THAI H T，Choi D H. Advanced analysis of multi-span suspension bridges [J]. Journal of Constructional Steel Research，2013，90 (11)：29—41.

JENNINGS A. Gravity Stiffness of Classical Suspension Bridges [J].Journal of Structural Engineering，1983，109 (1)：16—36.

XIAO E Y. On the gravity stiffness of suspension cables [J]. Highway，2000 (8)：43—49 (In Chinese)

LIU Z，LIU H J. New arithmetic for cable deflection and gravity stiffness of suspension bridges[J]. Engineering Mechanics，2009，26 (6)：127—132 (In Chinese)

CHAI S B，XIAO R C，SUN B. Deformation characteristics of main cable in suspension bridge caused by live load[J]. Journal of Tongji University (Natural Science Edition)，2012，40 (10)：1452—1457. (In Chinese)

HAN Y，CHEN Z Q，LUO S D，et al. Calculation method for the shape-finding of self-anchored uspension bridge with spatial cables[J]. Journal of Hunan University (Natural Sciences)，2007，34 (12)：20—25. (In Chinese)

JIANG W，SHAO X D，PENG W H，et al，Research on suspension bridges with a single-tower [J]. Journal of Hunan University (Natural Sciences)，2011，38 (6)：13—19. (In Chinese)

HUANG H. Research and application on calculation methods forcable curve of flexible suspension bridge in mountain area [J]. Highway Engineering，2010，35 (4)：94—96 (In Chinese)

JIANG N，SHENR L. Influence of rise-span ratio on structural stiffness of suspension bridge [J]. China Civil Engineering Journal， 2013，46 (7)：90—97 (In Chinese)

JTG/T D65-05-2015 Specifications for design of highway suspension bridge [S]. Beijing：China Communications Press，2015：18— 21 (In Chinese)

ZHOU X N. Engineering cableway and flexible suspension bridge [M]. Beijing：China Communications Press，2008：247—250. (In Chinese)

Load test report of Jiu-feng-gu pedestrian suspension bridge [Z]. Zhejiang：Zhejiang Zhongneng Engineering Testing Co.，Ltd，2018： 1—12. (In Chinese)


Refbacks

  • There are currently no refbacks.