大跨度锯齿形锥壳屋盖厂房动力实测和地震效应的分析

本文介绍36m跨锯齿形锥壳屋盖厂房的动力实测和有限元方法计算其地震效应的分析结果。实测中采用了激振、冲击和脉动等方法,获得了该结构的自振频率、振型和阻尼。用有限元方法和程序进行了大量分析计算,探求到其动力特性和地震效应的特点。实测和计算均表明:计算的自振频率和振型与实测值符合;地震效应以垂直振型为主;一般应取前10个振型进行振型组合。试验研究结果表明该结构具有良好的抗震性能,在8度地震区使用是安全的。这一研究为推广和改进这类结构提供了实践和依据,

Dynamic Test and Seismic Response Analysis of an Industrial Building with Large Span Saw-Tooth Conoidal Shell Roof

This paper introduces the analytical results of dynamic test and finite element calculation of an industrial building with 36m span saw-tooth conoidal shell roof. Vibrations in the test were excited by machine harmonic excitation, shock excitation and pulsation. Natural frequences, vibration modes and damping ratio were thus obtained. The dynamic behavior and seismic response property of the structure were acquired through a large amount of calculations by use of the finite element method and computer programs. Both the test and calculation showed that: the calculated natural frequences and modes agree well with those of the test;vertical modes are predominant in the seismic response; usually the first ten modes are needed for mode combination. This structure possesses good earthquake resistance in regions with seismic intensity 8. The test and research provide experience and grounds to spread and improve such kind of structures.