基于温度效应的混凝土砌块建筑抗裂结构设计方法研究

Research on crack-resisting construction design method of concrete small cavity block building based on temperature effect

本文针对以往砌块建筑抗裂设计中存在的缺点与不足,采用调查研究、有限元数值分析、理论研究、砌块墙体试验相结合的综合手段来研究砌块建筑中的温度裂缝,并通过调查研究、有限元数值分析、砌块墙体试验的结果,对砌块建筑进行了整体的抗裂概念设计,把砌块建筑的抗裂设计从感性转变为理性,并通过理论研究与试验分析相结合推导了砌块墙体的初裂荷载计算公式和砌块建筑温度效应计算公式,提出了基于抗裂的砌块建筑层间位移控制方法,并根据上述公式提出了砌块墙体的抗裂截面设计步骤和方法,使砌块建筑的抗裂设计从理性提高到量化设计的水平,并针对杭州市砌块建筑试点工程进行了实例设计研究,为以后砌体规范中抗裂设计方法的改进提供参考。

The temperature cracks of the concre te small cavity block building(CSCBB)were studied through field investigation on existing buildings,finite element analysis and experiment on wall specimens,thus to impr ove the structural design method of crack-resisting in CSCBB from concept desig n to sectional design and to transform the structural design method of crack-resisting from perception to rationality.In this paper,the formulas for calculating horizontal force and shearing force of wall under temperature load and th e load of crack-resisting for different types of masonry walls were derived.Finally the crack-resisting design method o f wall section based on controlling s tory drift of the structure was proposed.A practical crack-resisting design of a pilot pr oject in Hangzhou has been carried ou t with satisfactory result.