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工程结构等强度位移比谱研究
引用本文:翟长海,谢礼立,张敏政.工程结构等强度位移比谱研究[J].哈尔滨工业大学学报,2005,37(1):45-48,73.
作者姓名:翟长海  谢礼立  张敏政
作者单位:1. 哈尔滨工业大学,土木工程学院,黑龙江,哈尔滨,150090
2. 哈尔滨工业大学,土木工程学院,黑龙江,哈尔滨,150090;中国地震局工程力学研究所,黑龙江,哈尔滨,150080
3. 中国地震局工程力学研究所,黑龙江,哈尔滨,150080
基金项目:高等学校博士学科点专项科研基金资助项目(20030213042) 黑龙江省自然科学基金资助项目(ZJG03—03,E0228,E0226).
摘    要:在估计已知强度的现有结构在不同地震动强度下的最大弹塑性位移时,等强度位移比谱是十分准确有效的.本文利用大量的单自由度体系在不同强震记录作用下的弹塑性动力时程分析结果,对等强度位移比谱进行了较为详尽的研究,给出了四类场地条件(基岩、硬土、一般土和软土)上的平均等强度位移比谱,总结了对工程结构的抗震设计和研究具有重要意义的特征和规律,分析了场地条件、地震烈度、结构的屈服强度系数及周期等因素对等强度位移比谱的影响规律,得到了一些重要的结论,最后提出了新的拟合公式,其成果对抗震研究和设计具有较大的参考价值.

关 键 词:基于位移的抗震设计  等强度位移比谱  最大弹塑性位移估计
文章编号:0367-6234(2005)01-0045-04

A study on constant-relative-strength inelastic displacement ratio spectra for evaluation of existing structures
ZHAI Chang-hai,XIE Li-li,ZHANG Min-zheng.A study on constant-relative-strength inelastic displacement ratio spectra for evaluation of existing structures[J].Journal of Harbin Institute of Technology,2005,37(1):45-48,73.
Authors:ZHAI Chang-hai  XIE Li-li  ZHANG Min-zheng
Abstract:In the evaluation of existing structures with known lateral strength, the displacement ratio spectra of constant yielding strength that provide inelastic displacement ratios to estimate maximum lateral inelastic displacement demands on existing structures from maximum elastic displacement demands are particularly useful. A statistical study are performed of inelastic displacement ratio computed for SDOF systems with different levels of lateral yielding strength normalized to strength required to remain elastic when subjected to a large number earthquake accelerations. The constant-relative-strength inelastic displacement ratio spectra corresponding to rock, stiff soil, medium soil, soft soil site conditions are presented and the influences of record intensity, site conditions, period of vibration, level of lateral strength on the spectra are discussed. It is concluded that whether the intensity of a record is high or low, as long as the relative lateral yielding strength is equivalent, the constant-relative-strength inelastic displacement ratio spectra of the record are the same. And it also reveals that site conditions, yield strength level and period of structures have important effects on the inelastic spectra and for different relative lateral yielding strength, the effects of site conditions on spectra are different. In addition, the limiting period that divides the short-period spectral region where spectra are strongly dependent on period and the long-period spectral region where spectra tend to be constant is not only the function of site conditions but also depends on the relative lateral yielding strength. Finally, an new experimental expression of constant-relative-strength inelastic displacement ratio spectra from non-linear regression is developed, which permits the estimation of maximum inelastic displacement demands of the existing structures with known lateral strength built on different site conditions from maximum elastic displacement demands and has been recommended to adopt in seismic design code.
Keywords:displacement-based seismic design  constant-relative-strength inelastic displacement ratio spectra  evaluation of maximum inelastic displacement demands
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