寒冷地区砖结构房屋地震破坏特征和减轻震害的措施

EARTHGUAKE DAMAGE FEATURE OF BRICK STRUCTURE HOUSE AND SHOCK ABSORPTION MEASURE IN COLD AREA

我国有许多地震区分布于东北、青藏高原、天山、阿尔泰山及祁连山等冻土区.冻土地区在地表冻结深度达到一定厚度时,刚性多层砖房的地震震害加剧.沾河地震现场地脉动的实测研究结果表明,这是硬而厚的冻土层使地面卓越周期变短.若与刚性多层砖房的自振周期相合拍或接近则引起共振或类共振现象,导致震害加剧本文推荐在基础粱与承重墙根下的钢筋混凝土圈梁之间铺设砂层作为隔震措施.通过模拟地震振动台输入地震波进行模型试验研究,确认可以解决冻土地基因地面卓越周期改变而加剧刚性结构震害的问题.

In China there are a number of earthquake areas distributing in frozen soil region in Northeast China. the Qinghai—Xizang plateau, Tian mount in. Aertai mountain and Qilian mauntain If frozen ground achieves certain depth earthquake damage of multilayer rigid brick house will aggravate. The results observing ground pulsate on the spot of zhanhe earthquake area show that hard and thick frozen soil will make outstanding period of ground smaller. Earthquake damage aggravates because the period closes natural period of multilayer rigid brick and leads to resonance. Meanwhile we give a shock absorption measure overcoming the resonance phenomenon resulting from frozen soil.