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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (4): 692-701    DOI: 10.3785/j.issn.1008-973X.2019.04.010
土木工程、海洋工程     
考虑河谷地形影响的多层框架结构地震易损性
黄博1,2(),廖凯龙1,2,赵宇1,2,*(),蒋建群3
1. 浙江大学 软弱土与环境土工教育部重点实验室，浙江 杭州 310058
2. 浙江大学 岩土工程研究所，浙江 杭州 310058
3. 浙江大学 水工结构与水环境研究所，浙江 杭州 310058
Seismic fragility analysis of multi-storey frame structure considering effect of valley terrain
Bo HUANG1,2(),Kai-long LIAO1,2,Yu ZHAO1,2,*(),Jian-qun JIANG3
1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China
2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
3. Institute of Hydraulic Structure and Water Environment, Zhejiang University, Hangzhou 310058, China
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摘要：

针对杭嘉湖地区冲淤河谷地形分布广泛的特殊情况，结合当地土体工程特性和抗震设防区划设置现状，基于动力时程分析以及概率统计方法，给出适用于杭嘉湖地区多层框架结构的地震易损性曲线，对比不考虑地基、均质地基和河谷地基条件下多层框架结构的动力分析结果. 研究土-结动力相互作用以及局部河谷地形对结构动力响应和易损性的影响，考察房屋结构位于河谷不同位置处的差异. 结果表明，土-结动力相互作用对结构的动力分析结果有显著影响，不考虑土-结动力相互作用将低估房屋结构变形，易损性性能水平超越概率偏低，偏差可达7.9%，结果偏于危险；局部河谷地形对地震波独特的聚焦效应会增大结构变形，地震易损性超越概率与均质地基相比增幅可达12.1%，且河谷不同位置处的聚焦效果不同，在选取的地震波输入下表现为房屋结构距河谷中心越近，结构变形越大、地震易损性超越概率越大.
关键词： 地震易损性;  多层框架结构;  土-结动力相互作用;  局部河谷地形;  聚焦效应    
Abstract:

The seismic fragility curves of multi-storey frame structures suitable for Hangjiahu area were given based on dynamic time history analysis and probability statistics method combining with the local soil engineering characteristics and the fact of seismic fortification zones in view of the special situation that the scouring and silting valley topography is widely distributed in Hangjiahu area. The dynamic analysis results of multi-storey frame structures without considering foundation, homogeneous foundation and River Valley Foundation were compared. Results show that soil-structures dynamic interaction has a significant influence on the dynamic analysis results of structures. The deformation and the exceeding probability of fragility performance level of buildings were underestimated without considering soil-structures dynamic interaction. The deviation can reach 7.9%, which will lead to a dangerous result. The unique focusing effect of local valley topography on seismic waves will increase the structural deformation. The exceeding probability of seismic vulnerability can increase by 12.1% compared with homogeneous foundation, and the focusing effect is different at different locations of the valley. Under the selected seismic wave input, the closer the building structure is to the center of the valley, the greater the structural deformation and the greater the probability of exceeding the seismic fragility are.
Key words: seismic fragility    multi-storey frame structure    soil-structure dynamic interaction    local valley terrain    focusing effect
收稿日期: 2018-06-30 出版日期: 2019-03-28
CLC:  TU 435  
通讯作者: 赵宇     E-mail: cehuangbo@zju.edu.cn;zhao_yu@zju.edu.cn
作者简介: 黄博（1973—），女，副教授，从事土动力学和实验土力学研究. orcid.org/0000-0002-7293-8618. E-mail: cehuangbo@zju.edu.cn
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引用本文:

黄博,廖凯龙,赵宇,蒋建群. 考虑河谷地形影响的多层框架结构地震易损性[J]. 浙江大学学报(工学版), 2019, 53(4): 692-701.

Bo HUANG,Kai-long LIAO,Yu ZHAO,Jian-qun JIANG. Seismic fragility analysis of multi-storey frame structure considering effect of valley terrain. Journal of ZheJiang University (Engineering Science), 2019, 53(4): 692-701.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.04.010    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I4/692

图 1  房屋结构尺寸与条基尺寸
土层 ρ/(kg·m?3) E/MPa μ c/kPa φ/（°）
淤泥质土 1 820 149 0.49 5 20
粉质黏土 2 000 329 0.49 8 25
表 1  地基土体参数
图 2  地基模型概化图
图 3  地表中心点加速度时程曲线
地震名称 年份 Ms R/km
EL Centro 1979 6.6 2.5
Chichi 1999 7.6 7.3
Taft 1952 7.4 41.0
Kobe 1995 6.9 15.5
Loma Prieta1 1989 6.9 70.4
Loma Prieta2 1989 6.9 28.6
Loma Prieta3 1989 6.9 35.5
Northridge1 1994 6.7 7.1
Northridge2 1994 6.7 6.2
Whittier Narrows 1987 5.3 4.4
Coalinga 1983 6.0 10.0
Kocaeli 1999 7.4 67.5
Mammoth Lake 1980 4.9 7.5
San Fernando 1971 6.6 12.0
Coyote 1979 5.7 12.6
Nahanni 1985 6.8 6.0
Duzce 1999 7.2 8.2
Cape Mendocino 1992 7.1 9.5
表 2  实际地震记录
图 4  所选18条地震波反应谱
图 5  均质地基模型地面、基底处的加速度时程曲线
图 6  均质地基模型地面、基底的加速度傅里叶谱
图 7  均质地基、河谷地基模型柱底加速度反应谱比
图 8  结构变形曲线
图 9  考虑局部河谷地形的结构地震易损性曲线
图 10  河谷地形影响的超越概率增加量
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