空间效应下超长型钢混凝土结构地震响应研究  

Seismic response of ultra-long steel reinforced concrete structures under spatial effects

作　　者：邓敬旻 赵起超 林焯铭 彭修宁[1] DENG Jingmin;ZHAO Qichao;LIN Zhuoming;PENG Xiuning(College of Civil and Architectural Engineering,Guangxi University,Nanning 530000,China)

机构地区：[1]广西大学土木建筑工程学院,南宁530000

出　　处：《振动与冲击》2024年第17期163-176,共14页Journal of Vibration and Shock

摘　　要：超长结构空间效应下的地震响应分析是当前抗震研究的热点之一,空间效应对尺寸较小的建筑影响不大,但对平面投影尺度很大的结构地震响应的影响不可忽略。在传统三角级数法合成人工一维地震的基础上采用了三维相干函数矩阵,通过选取合适的模型及相应参数合成考虑空间效应的人工三向地震动。采用了4条自然波及2条人工波对超长型钢混凝土结构进行抗震计算。结果表明:超长结构不适宜仅采用振型分解反应谱法进行地震计算,还需采用地震时程分析法补充计算;与一致激励相比,行波效应会促使构件内力响应两极分化,既能减小整体内力响应,又能增大部分峰值内力,其效果不仅与视波速有关还与激励方向有关,低视波速和长边激励时行波效应加强;与单向激励相比,双向激励下的行波效应影响更复杂,既能改变构件内力响应和主、次动力响应的变化趋势,也能改变不利构件的分布位置;相干效应与行波效应叠加时,会进一步改变构件动力和内力响应。高视波速下相干效应为主导,底层构件内力响应增大。低视波速下行波效应为主导,地震响应呈现两极分化;不利构件的分布不仅与建筑的开洞、设缝及楼层刚度变化等因素有关,还与地震激励方向有关,不利构件沿激励方向有规律地延伸分布。Seismic response analysis under spatial effect of ultra-long structures is one of hotspots in current aseismic studies.The spatial effect has little impact on small-sized buildings,but its impact on seismic response of structures with large planar projection scales can’t be ignored.Here,based on using traditional trigonometric series method to synthesize artificial 1-D earthquakes,a 3-D coherence function matrix was adopted to synthesize an artificial 3-D ground motion considering spatial effects by selecting appropriate model and corresponding parameters.4 natural waves and 2 artificial waves were used to do aseismic calculations for ultra-long steel reinforced concrete structures.The results showed that for ultra-long structures,it is not suitable to use only the mode decomposition response spectrum method for seismic calculation,and the seismic time history analysis method should be used to supplement calculations;compared with consistent excitation,the traveling wave effect can make internal force responses of components be polarization,it can reduce the overall internal force response and increase some peak internal forces,its effect is not only related to the apparent wave velocity but also to the direction of excitation,the traveling wave effect is enhanced under low apparent wave velocity and long-side excitation;compared with the unidirectional excitation,the influence of the traveling wave effect under bidirectional excitation is more complex,it not only can change the variation trend of component internal force responses and primary and secondary dynamic responses,but also can change distribution positions of unfavorable components;when the coherent effect is superposed to the traveling wave effect,it is possible to further change dynamic and internal force responses of components;under high apparent wave velocity,the coherent effect is dominant,and internal force responses of bottom components increase;under low apparent wave velocity,the traveling wave effect is dominant,and seismic responses exhib

关 键 词：超长结构 地震动空间效应 人工三向地震动 行波效应 相干效应 

分 类 号：TV335[水利工程—水工结构工程] TP312[自动化与计算机技术—计算机软件与理论]