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旨在提供并且验证一个简化模型,可用于预测C形檩条的纵向应力。首先,介绍一个关于弯曲应力的简单案例,其中外力施加在剪力中心,或者施加在双侧翼缘都有支撑的截面中。如通常在檩条-护墙板系统中发现的一样,当弯曲问题变得比较复杂时,即可取消对加载点和翼缘的约束,而仅仅考虑对受拉翼缘转动的约束。回顾并验证用于预测纵向应力的Winter模型,这个模型是为解决直接受拉问题而开发的,将该模型扩展,使其能解决受拉翼缘受限的弯曲构件的计算问题。从弯曲和约束扭转作用中得到的纵向应力,用于评估典型的檩条-护墙板系统的弹性稳定性能。最后,为现有的AISI方法提供了典型C形檩条的强度预测方法,并且利用该方法中预测的纵向应力分布为直接强度方法提出了新的扩展建议。
Aims to provide and validate a simplified model that can be used to predict the longitudinal stress of a C-shaped purlins. First, introduce a simple case of bending stress where external forces are applied at the center of the shear force, or in the cross-section where both flanges are supported. As is commonly found in the purlins - siding systems, the constraint on the loading point and the flange can be eliminated when the bending problem becomes more complicated, and only the constraint on the rotation of the tension flange is taken into account. The Winter model for predicting longitudinal stress was reviewed and validated. This model was developed to solve the direct tension problem. The model was extended to solve the computational problems of curved members with tensioned flanges. Longitudinal stress from bending and constrained twisting is used to evaluate the elastic stability of a typical purlins-siding system. Finally, the strength prediction method of a typical C-shaped purlins is provided for the existing AISI method, and a new extension proposal is proposed for the direct strength method by using the predicted longitudinal stress distribution in this method.