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历来各国木结构设计规范在考虑可变荷载与永久荷载共同作用下的长期强度修正系数可分为两类:其一是按荷载组合中作用时间最短者,取与之相应的强度修正系数.这种方法往往提高了结构抗力;另一是不论可变荷载作用时间长短,也不论可变荷载与永久荷载比值之大小,笼统地取某一定值修正系数,使构件实际可靠水平有很大的浮动幅度.本文根据可变荷载与永久荷载之比值以及可变荷载作用期久暂分别求出相应的抗力修正系数,其优点是可以使构件可靠水平持平,方法简便,可供修改木结构设计规范参考.
Traditionally, the long-term strength correction coefficients of national wood structure design codes considering variable and permanent loads can be divided into two categories: one is the shortest acting time in the load combination and the corresponding strength correction factor. This method tends to increase the structural resistance; the other is that regardless of the length of time of the variable load, and regardless of the size of the variable load and the permanent load ratio, a certain fixed value correction factor is taken in a unified manner, so that the actual reliability level of the component is greatly floated. Amplitude. According to the ratio of the variable load and the permanent load and the variable load duration, the corresponding resistance correction coefficient is obtained respectively. The advantage is that the components can be leveled reliably, the method is simple, and the wood structure design specification can be modified. .