多层大开间砌体结构的基本周期实测与分析

基于脉动法对110栋中小学教学楼等多层大开间砌体结构进行动力性能实测，识别结构在使用阶段的基本周期。按有无构造柱和圈梁把所测结构分为无圈梁构造柱结构、有圈梁无构造柱结构和有圈梁构造柱结构，对基本周期进行最小二乘回归统计分析，分析结构的层数、高度、高宽比和长宽比对基本周期的影响，并利用3个相关结构实例对公式的可靠性、有效性进行验证。结果表明：圈梁和构造柱的存在能够减小大开间砌体结构基本周期的变化速度，长宽比对基本周期的影响程度远小于高宽比的影响程度，而高宽比对基本周期的影响程度比层数和高度小得多。提出三类多层大开间砌体结构的基本周期关于层数、高度、高宽比的经验公式。

VIBRATION TEST AND ANALYSIS OF THE FUNDAMENTAL PERIOD OF MULTI-STOREY MOSONRY STRUCTURES WITH LARGE-BAY

A total of 110 school buildings were selected for vibration tests based on a pulse method in order to identify the fundamental periods.New formulas for the estimation of the fundamental periods of multi-storey masonry structures with large-bay were presented.Three kinds of structures were considered,the structure without a ring beam and a structural column,the structure with ring beams,and the structure with ring beams and structural columns.The least squares regression analysis was employed to analyze the effect of the number of floor,height,height-width ratio and length-width ratio to the fundamental periods.The formulas were verified by using three examples.The results showed the structure with ring beams and structural columns can reduce the rate of change of the fundamental period.The length-width ratio effect is far less than that of a height-width ratio.And the height-width ratio effect is far less than that of the number of floor and height.New empirical formulas were derived.