| 橡胶砂芯组合砌块动力特性及隔震效应数值分析 |
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| 引用本文： | 刘方成,王将,周本强,曾湘华,王成虎.橡胶砂芯组合砌块动力特性及隔震效应数值分析[J].世界地震工程,2022,38(4):151-159. |
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| 作者姓名： | 刘方成 王将 周本强 曾湘华 王成虎 |
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| 作者单位： | 1. 湖南工业大学, 湖南 株洲 412007;2. 湖南智谋规划工程设计咨询有限责任公司, 湖南 株洲 412007 |
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| 摘 要： | 在混凝土空心砌块的空腔中填入橡胶砂形成的组合砌块（RSMCB）可作为简易隔震层应用于村镇建筑防震减灾。建立RSMCB的三维数值分析模型，进行循环剪切试验以及隔震分析，研究不同橡胶砂配比、竖向压应力、盖板尺寸和盖板埋深对隔震砌块动刚度和阻尼比的影响，分析不同的上部配重、输入地震波、橡胶砂配比、盖板尺寸和铺设方式对RSMCB垫层隔震效果的影响。结果表明:（1）橡胶砂芯组合砌块应变软化现象明显。（2）RSMCB的水平动刚度随橡胶砂配比增大而减小，随盖板埋深、盖板尺寸以及竖向压应力的增大而增大。（3）阻尼比随橡胶砂配比、竖向压应力、盖板尺寸和埋深的增大而减小，橡胶砂芯组合砌块隔震消能效果显著。在隔震数值模拟中，输入加速度在经过橡胶砂芯组合砌块垫层过滤后均有不同程度的降低，且被过滤掉大部分高频波。隔震效应随着盖板尺寸的增大而减小，上部结构配重越大，隔震效应越明显，橡胶砂配比为30%时RSMCB垫层隔震效应更好。橡胶砂芯组合砌块符合在村镇欠发达地区低成本隔震的要求，表现出广阔的应用前景。
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| 关 键 词： | 橡胶砂 隔震砌块 滞回曲线 减震系数 数值模拟 |
Numerical analysis of dynamic characteristics and isolation effect of rubber sand mixture core composite block |
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| LIU Fangcheng,WANG Jiang,ZHOU Benqiang,ZENG Xianghua,WANG Chenghu.Numerical analysis of dynamic characteristics and isolation effect of rubber sand mixture core composite block[J].World Information On Earthquake Engineering,2022,38(4):151-159. |
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| Authors: | LIU Fangcheng WANG Jiang ZHOU Benqiang ZENG Xianghua WANG Chenghu |
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| Affiliation: | 1. Hunan University of Technology, Zhuzhou 412007, China;2. Hunan Zhimou Planning Engineering Design Consulting Co. LTD, Zhuzhou 412007, China |
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| Abstract: | The combined blocks(RSMCB)formed by filling the cavities of concrete hollow blocks with rubber sand mixtures can be applied as simple seismic isolation layers for seismic mitigation of village buildings. A three-dimensional numerical analysis model of RSMCB was established,and cyclic shear tests and seismic isolation analysis were conducted to study the effects of different rubber sand ratios,vertical compressive stress,cover size and cover burial depth on the dynamic stiffness and damping ratio of seismic isolation blocks,and to analyze the effects of different upper counterweights,input seismic waves,rubber sand ratios,cover sizes and laying methods on the seismic isolation effect of RSMCB bedding. The results show that:(1)the strain softening of the rubber sand core composite block is obvious; (2)the horizontal dynamic stiffness of RSMCB decreases with the increase of rubber sand ratio,and increases with the increase of cover depth,cover size and vertical compressive stress; (3)the damping ratio decreases with the increase of rubber sand ratio,vertical compressive stress,cover size and depth, and the seismic isolation and energy dissipation effect of the rubber sand core composite block is significant. In the numerical simulation of seismic isolation,the input acceleration is reduced to different degrees after filtering by the rubber sand core composite block bedding,and most of the high frequency waves are filtered out. The seismic isolation effect decreases with the increase of cover size,and the larger the superstructure weight,the more obvious the seismic isolation effect is,and the seismic isolation effect of RSMCB bedding is better when the ratio of rubber sand mixture is 30%. The rubber sand mixture core combination block meets the requirements of low-cost seismic isolation in the less developed areas of villages and towns,and shows a broad application prospect |
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| Keywords: | rubber sand mixture isolation block hysteretic curve regression coefficient numerical simulation |
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