FINITE-ELEMENT ANALYSIS OF DYNAMIC CHARACTERISTICS OF TEMPORARY BEAM MODEL D FOR CONSTRUCTION

GUO Xiang-wu

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Journal of Railway Engineering Society ›› 2006, Vol. 23 ›› Issue (1) : 44-47.

FINITE-ELEMENT ANALYSIS OF DYNAMIC CHARACTERISTICS OF TEMPORARY BEAM MODEL D FOR CONSTRUCTION

GUO Xiang-wu

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Abstract

Research purpose: The Temporary Beam Model D for construction is often as temporary structure for reinforcing existing railway line. The sped of train is limited to 45 km/h on the temporary beam according to the rule stipulated in "Rules of Railway Engineering and Maintenance Safety", but in fact, the speed of train on the temporary beam is often increased to 60 km/h or more in order to reduce the influence on traffic by construction. This research is for providing theoretical basis for speed-raise.

Research method: The mechanics analysis is made to the load born by temporary beam by adopting the method of finite-element analysis and establishing mathematics model.

Research conclusion: The vertical deflection value of temporary beam under effect of real load is very close to the calculated result after considering the impact factor by adopting the research method. The sample result of displacement in span of temporary beam is also very close to the calculated result, only a little smaller than the calculated result. The frequency of sample D24 temporary beam is 3.7236 Hz and is larger than theoretically calculated result by 8.8 percent. Therefore, it shows the temporary beam has enough rigidity.

Key words

temporary beam / dynamic characteristics / finite-element / modal analysis

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GUO Xiang-wu. FINITE-ELEMENT ANALYSIS OF DYNAMIC CHARACTERISTICS OF TEMPORARY BEAM MODEL D FOR CONSTRUCTION[J]. Journal of Railway Engineering Society, 2006, 23(1): 44-47