基于梯度功能的高性能结构抗震设计方法  

Seismic design method of high-performance structure based on gradient function

作　　者：张玉欢 余丁浩 李钢[1] Zhang Yu-huan;Yu Ding-hao;Li Gang(State.Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024

出　　处：《工程抗震与加固改造》2022年第3期1-14,共14页Earthquake Resistant Engineering and Retrofitting

基　　金：国家重点研发计划项目(2018YFC1504303);国家自然科学基金(51878112);中国博士后科学基金(2020M670751);辽宁省“兴辽英才计划”项目(XLYC1902043)。

摘　　要：随着结构抗震研究的不断深入,兼顾结构安全与震后运营功能的抗震设计理念日益受到工程界的关注。于此同时,大量具有赘余构件或分灾元件的高性能结构体系也不断涌现,此类结构具有多道抗震防线,地震作用下结构功能随着不同抗震防线的渐次失效而逐渐降低。为此提出了一种适用于高性能结构的梯度功能抗震设计方法,该方法通过引导结构中不同抗震防线的损伤次序与程度,能够使结构功能按照设计目标梯度降低,从而保证结构在不同地震设防水准下实现预期梯度功能目标。该方法将结构功能梯度变化过程划分为使用良好、损伤可控以及防止倒塌三个阶段,通过建立结构功能与构件损伤之间的关系,将结构在不同地震设防水准下的梯度功能目标转化为结构各构件的预期损伤目标,建立了能够考虑不同功能目标下结构损伤分布模式差异性的抗震设计流程。算例结果表明了本文方法的准确性及实用性。With the deepening of structural seismic research, the concept of seismic design which takes into account structural safety and post-earthquake operation functions has been paid more and more attention by engineering. At the same time, a large number of high-performance structural systems with redundant or damage-reduction components are also emerging, such structures have multiple seismic lines, and the structural function is gradually reduced with the gradual failure of different seismic lines under the action of earthquakes. Therefore, a gradient function seismic design method for high-performance structures is proposed, this method can reduce the structural function according to the design objective gradient by guiding the damage order and degree of different seismic lines in the structure, so as to ensure that the structure can achieve the expected functional gradient objective under different seismic fortification levels. This method divides the process of structural functional gradient change into three stages: normal service, damage-control and collapse prevention, the functional gradient target of the structure under different seismic fortification levels is transformed into the expected damage target of each component of the structure by establishing the relationship between structural function and component damage, and the seismic design flow which can consider the difference of the structure damage distribution pattern under different functional objectives is established. The results of numerical examples show the accuracy and practicability of the proposed method.

关 键 词：抗震设计 高性能结构 梯度功能 等价线性化方法 构件损伤 

分 类 号：TU318[建筑科学—结构工程]