直立锁缝屋面体系固定支座的有效静力风荷载

Effective Static Wind Load for Clips of Standing Seam Roof System

摘要:

针对强风作用下直立锁缝屋面体系多发生固定支座脱扣破坏现象，综合考虑固定支座受力的实际影响范围和屋面脉动风力的空间相关性，提出了固定支座有效受风承载面积的计算方法.基于刚性模型同步测压风洞试验测得的双坡屋面表面风荷载时程数据，建立了考虑风荷载传递路径的直立锁缝屋面体系有限元模型.基于理论分析和动力时程分析，通过相对传统风荷载从属面积的放大系数合理取值，将有效受风承载面积的概念引入到固定支座的有效静力风荷载估计中.计算结果表明，采用建议的修正方法得到的固定支座所受风荷载值可以包络实际风致动力响应的极值，且表达形式简洁，方便工程设计使用.

Abstract:

Detachment failure of clips from roof panels of standing seam roof system is a typical and often happened phenomenon in practice. A calculation method of effective wind loaded area for the clips under wind load is proposed considering the actual wind loaded area and the spatial correlation of fluctuating wind pressure on the roof surface. Based on wind load time series obtained from the synchronous multi pressure measurement on a rigid gable roof model, the finite element model for standing seam roof system considering wind load path in the roof system is established. By using a magnification coefficient in comparison with the widely used tributary area, the concept of effective wind loaded area is introduced to estimate the effective static wind load for the clips. It is shown that the wind induced forces for clips obtained from the proposed calculation method using the magnification coefficient can envelope the extreme values from dynamic time history analysis, and the expression of the method is very simple, which will be convenient in practical use.