Study on dynamic response of embedded long span corrugated steel culverts using scaled model shaking table tests and numerical analyses

A series of scaled-model shaking table tests and its simulation analyses using dynamic finite element method were performed to clarify the dynamic behaviors and the seismic stability of embedded corrugated steel culverts due to strong earth-quakes like the 1995 Hyogoken-nanbu earthquake. The dynamic strains of the embedded culvert models and the seismic soil pressure acting on the models due to sinusoidal and random strong motions were investigated. This study verified that the cor-rugated culvert model was subjected to dynamic horizontal forces (lateral seismic soil pressure) from the surrounding ground, which caused the large bending strains on the structure; and that the structures do not exceed the allowable plastic deformation and do not collapse completely during strong earthquake like Hyogoken-nanbu earthquake. The results obtained are useful for design and construction of embedded long span corrugated steel culverts in seismic regions.

埋置式钢波纹管设计方法的比较及分析

埋置式钢波纹管因其具有施工方便、环保等优点,在国外被广泛地应用于水利治理、隧道、小跨径桥涵等工程中,但在国内无成熟经验与相应的设计规范,分析研究美国和加拿大规范对我国相应工程的设计与规范的制订具有重要意义.首先介绍了美加规范关于埋置式钢波纹管的设计原理、计算方法以及参数取值.在此基础之上,运用控制变量法对钢波纹管最小覆土厚度和管壁强度验算进行实例对比.算例表明:最小覆土厚度计算时,加拿大规范除考虑管-土相互作用和土拱效应之外,还考虑了波纹管的管形效应,计算值平均比美国规范计算值大34.05%;管壁验算时美国规范没有考虑土拱效应和波纹管两侧填土重量,管壁抗力比加拿大规范计算值平均大50%以上;美国规范中关于施工验算的要求是加拿大规范的有益补充.

地下大断面薄钢结构地震响应的试验研究及数值分析

为明确地下大断面薄钢结构的安全实用性,进行1/16大断面薄钢结构的系列模型振动试验、实际规模结构的现场试验和有限元分析。在把握作用于模型的地震动土压力及结构的应变状况的基础上,对施工过程中结构的响应特性及土压力的变化等进行研究。明确地下大断面薄钢结构的地震及施工时的安全性,为今后大断面薄钢结构的设计、施工提供依据。