三向地震作用下密肋复合墙结构模型振动台试验研究  

Shake table test on dynamic response of multi-ribbed wall structure model excited by tri-dimension earthquake wave

作　　者：卢俊龙[1] 张荫[2] 

机构地区：[1]西安理工大学土木建筑工程学院,陕西西安710048 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《自然灾害学报》2017年第6期77-86,共10页Journal of Natural Disasters

基　　金：国家自然科学基金(51178385);陕西省自然科学基金(2016JM5017);西安建筑科技大学人才基金(RC1531)~~

摘　　要：为研究地震作用下密肋复合墙结构动力响应的基本规律,设计制作了1/15比例结构模型,进行了三向地震作用下的振动台试验。输入白噪声及不同烈度的El Centro波及天津波,测试了结构模型的加速度及位移反应,分析了结构破坏特征及动力特性,对比两种地震波作用下结构顶层的动力反应,研究了结构楼层动力放大效应随测点高度及地震烈度的关系,并与单向地震作用下的动力响应进行了对比。结果表明,地震烈度不大于8度时,密肋复合墙结构模型保持弹性状态,9度时在结构底部发生拼接缝滑移破坏,结构自振频率降低;结构地震放大效应与测点高度、地震波的峰值和频谱特性有关,水平动力放大效应随高度的变化规律与竖向动力放大效应不同,且当烈度较高时,三向地震的耦合效应较为显著。因此,除加强底部连接构造措施外,还应采取构造措施以增强中部楼层抗拔及顶部楼层的抗剪能力。To study the basic laws about dynamic response of the multi-ribbed wall structure excited by earthquake, the structure model scaled in 1/15 was designed and constructed for the shake table test excited by tri-dimension seismic wave. After white noise and El Centro wave and Tianjin wave in different intensity was input, the vibration characters, acceleration and displacement response of the structure model were measured. The damage and dynamic characters of the structure were analyzed. The dynamic response excited by the two seismic wave in the top floor were compared so as to study the relationship between the dynamic amplification effect and the height and seismic intensity. The dynamic response was also compared with that excited by unidirectional earthquake. Results showed the structure kept elastic when intensity was less than 8 degree while the structure was slide along construction joint in 9 degree, and the vibration frequencies were decreased. The amplifications to seismic response are related to height of test location, peak value and frequency spectrum of seismic wave which was input. The amplification of horizontal seismic response along height is different to that of vertical seismic response. The coupling effect of tri-directional earthquake excited by high intensity earthquake wave is remarkable. Therefore, besides the construction measures to connection at the bottom of the structure, the measures to strengthen the middle and the top floor also should be adopted to enhance the tension and shear capacity.

关 键 词：密肋复合墙结构 结构模型 振动台试验 地震反应 动力特性 

分 类 号：TU352.1[建筑科学—结构工程] TU317.1