加层建筑的二阶重力效应分析

Analysis on the Second-order Effect on Adding New Layers on the Top of Existing Buildings

随着城市化的发展,我国城市用地日趋紧张,综合建筑寿命和建筑经济指标等因素,对原有建筑进行加层已成为一种切实有效的方法.到目前为止,加层建筑结构中二阶效应的研究工作还不够深入.文章简单介绍了结构中的二阶效应,阐述了重力二阶效应分析中常用的三种基本方法,最后通过三个工程实例研究重力二阶效应对加层建筑自振周期、层间位移的影响规律.

Along with the development of urbanization and increasingly urgent trend of the urban land in China,integrating factors of the construction life and the building economic index and adding new layers on the top of existing buildings have become effective methods of relieves on increasingly urgent trend of the urban land.Up till now,the research on the second-order effect of adding new layers on the top of existing buildings is not in deep consideration.Introductions of the second-order effect on building structures and illustrations on three basic methods of analysis on gravity of the second-order effect are presented primitively.Through analysis on three practical projects,influence of natural vibration period and displacements between floors of adding new layers on the top of existing buildings under gravity of the second-order effect are researched.