生土围护墙倾覆倒塌高厚比限值分析

Limit of height-width ratio of surrounding earth wall under earthquake

传统木构架土坯墙(土筑墙)房屋,在地震过程中,墙体会发生平面外的倾覆倒塌破坏。对墙体倾覆倒塌的过程进行了分析,通过建立墙体平面外倾覆倒塌简化分析模型,得到了使墙体倾覆倒塌的最小加速度公式,给出了影响墙体倾覆倒塌的各个因素和最小加速度的关系曲线,初步得到了在不同地震烈度下避免墙体平面外倾覆的高厚比限值,并就如何避免墙体在地震中发生倾覆倒塌进行了探讨。

The rural houses are usually made of timber frame with surrounding earth wall. The wall will collapse out-of-plane during earthquake. A simplified method is presented for modeling the out-of-plane collapse behaviours of such surrounding wall. The minimum acceleration which causes the collapse is formulated. The curves describing the relationship between the factors causing the collapsing and the minimum acceleration are aslo presented. Finally, the limit of shape coefficient and height-width ratio, which are the most important factors controlling the collapsing of the wall are given, and the measures on how to avoid the wall collapsing are discussed.