外挂混凝土墙板对钢框架结构自振周期的影响

外挂混凝土墙板是装配式钢结构建筑、甚至普通钢框架结构建筑的主要围护墙体材料,对结构自振周期的影响不容忽视.在对各国规范中钢框架结构基本自振周期计算方法进行归纳的基础上,基于已有的一栋带蒸压轻质加气混凝土墙板足尺钢框架结构模型试验数据和一栋带预制装配式混凝土墙板钢框架教学楼实测数据,分析了相关规范计算方法的适用性.结果表明,考虑墙体的经验公式对带外挂混凝土墙板钢框架结构自振周期的估计较为准确.基于40栋带外挂混凝土墙板钢框架结构自振周期实测数据,提出了带外挂混凝土墙板钢框架结构自振周期经验公式.公式以结构高度为自变量,基本自振周期为结构高度的幂函数,公式计算结果离散度较小,与实测结果吻合较好,可供设计人员参考.

Effect of Exterior Concrete Wall Panels on Natural Period of Steel Frame Structures

Exterior concrete wall panels are becoming one of the main building envelope wall for prefabricated steel frame structures as well as ordinary steel frame buildings, and the effect of exterior concrete wall panels on the natural period of steel frames cannot be ignored. The calculation method for the fundamental natural period of steel frame buildings in current design codes are summarized, and the feasibility of these formulas for steel frames with exterior concrete wall panels is evaluated by comparing the empirical results with the test data of a full-scale steel frame structure with autoclaved lightweight concrete(ALC) panels and the field measured data of a steel frame school building with precast concrete wall panels. The results show that empirical formulas considering the effect of wall materials can predict the natural period in a reasonable precision. Based on the field measured natural periods of the steel frames with exterior concrete wall panels, the empirical formula for estimating the fundamental natural period of the steel frame structures with exterior concrete wall panels is put forward. The structural height is adopted as independent variable in the empirical formula, and the fundamental natural period is a power function of the structural height. The results obtained from the empirical formula have little discreteness and agree well with the field measured data. The empirical formula may provide a reference to engineering designers.