Research On Structural Design Of Pedestrian Bridge

Traffic jam has become a severe problem with the rapid development of economy and progress of society. In order to ease traffic pressure, a large amount of newly pedestrian bridges will be constructed by separating the pedestrian system from the vehicle system. The design of newly pedestrian bridges is different from that of traditional ones in that the former applies new materials and structures. To be specific, the newly constructed bridges are more graceful in shapes and more complex in force analyses. Besides, greater importance is attached to aesthetics and environmental protection of bridges. Therefore, detailed calculation and analyses are in demand so as to meet the qualifications of ultimate limit states and serviceability limit state of pedestrian bridges.Taking the overpass along the intersection of Xiaojia River and the pedestrian bridge of Jinsha Bus Station as examples, detailed calculations about the steel pedestrian bridges is conducted. Firstly, The present traffic situation in Chengdu and the important roles played by pedestrian bridges is briefly introduced. Secondly, the structure of the overpass along the intersection of Xiaojia River is briefly introduced. The finite element software MIDAS/Civil is applied to analyze and calculate strength, stiffness, and natural frequency of vibration of the bridge structure. Modeling calculation and comparative analyses are also conducted respectively to the main bridge considering main and accessory passage ways and whole bridge considering ladders and ramps. The structure is then checked and calculated under the accidental effects including seismic action and vehicle impact. Moreover, stability calculation is conducted in terms of the partial and whole structure. Some partial structures, including the bridge support, lateral diaphragm and ribbed stiffer, are calculated to meet the requirement of local compression. Besides, as the public’s aesthetic requirement has been constantly improved, some ancillary facilities, like drainage system and pavement of deck, are designed. Lastly, the findings on the design of Pedestrian bridges is summarized. The application prospect of the steel pedestrian bridges in the urban traffic system is made.