框架-多节段摇摆结构参数模型研究

Research on the parametric model of frame-multiple-segment rocking structures

摘要

为解决框架-单节段摇摆结构内力受高阶振型影响较为明显的问题，已有学者提出了框架-多节段摇摆结构，但对框架-多节段摇摆结构的参数模型研究较为有限。本文以框架-单节段摇摆结构参数模型为基础，建立了框架-多节段摇摆结构的参数模型；根据边界条件与变形协调条件，推导了结构的水平侧向变形和内力表达式，获得了针对框架-多节段摇摆结构的理论公式；运用OpenSees软件验证了参数模型的合理性与准确性。结果表明，增加框架-多节段摇摆结构节段数量能显著抑制高阶模态内力的响应，节段数量的增加对一阶模态响应几乎没有影响，对高阶模态响应整体上呈现快速减小的趋势。研究成果可应用于框架-多节段摇摆结构的初步设计。

Abstract

In order to solve the problem that the internal forces of frame-single-segment structures are significantly influenced by higher mode effects, scholars have proposed frame-multiple-segment rocking structures. Nevertheless, there are limited studies on the parametric models for frame-multiple-segment rocking structures. Therefore, a parametric model for frame-multiple-segment rocking structures was developed based on the existing parametric model of the frame-single segment rocking structures. The expressions for the horizontal lateral deformation and the internal forces were derived according to the boundary and deformation compatibility conditions. The theoretical formulas were obtained for frame-multiple-segment rocking structures. The rationality and accuracy of the parameter model were validated via OpenSees. The results indicate that increasing the number of segments in frame-multiple-segment rocking structures can significantly suppress the response of high-order modal forces, with the increase in segment number having almost no effect on the first-order modal response, and showing an overall trend of rapid decrease in high-order modal responses. The research findings of this paper can be applied in the preliminary design phase of frame-multiple-segment rocking structures.

关键词

框架-摇摆结构 / 钢桁架 / 参数模型 / 抗震性能 / 高阶振型

Key words

frame-rocking structure / steel truss / parametric model / seismic performance / higher mode

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基金资助

2023年度中国施工企业管理协会科研项目(2023-C-056)

浙江省住建厅2023年建设科研项目(2023K192)

2023年度宁波市社会投资建设科研计划项目(202347)