以传统灰浆为粘结材料的手工青砖砌体弯曲抗拉强度试验研究  

Experimental study on bending tensile strength of manual gray brick masonry with traditional mortars as bonding materials

作　　者：丁伟 王占雷 吉立朋 DING Wei;WANG Zhanlei;JI Lipeng(Hebei Academy of Building Research Co.,Ltd.,Shijiazhuang 050021,China)

机构地区：[1]河北省建筑科学研究院有限公司,石家庄050021

出　　处：《建筑结构》2021年第6期109-113,共5页Building Structure

基　　金：河北省建设科技研究计划项目(2016-105)。

摘　　要：结合实际文物修缮保护工程的需要,制备以纯白灰、白灰砂浆、掺灰泥等传统灰浆为粘结材料的手工青砖砌体试件,进行弯曲抗拉强度试验,分析了该类砌体弯曲抗拉破坏特征和弯曲抗拉强度。结果表明,以传统灰浆为粘结材料的手工青砖砌体的弯曲抗拉破坏是在纯弯区沿青砖和灰浆界面处的断裂破坏,脆性特征明显,其弯曲抗拉强度显著低于具有相同砂浆强度的以现代砂浆为粘结材料的烧结普通砖砌体。采用最小二乘法对规范弯曲抗拉强度平均值计算式进行了修正,建立了适用于以传统灰浆为粘结材料的手工青砖砌体弯曲抗拉强度平均值计算公式,建议了适用于该类砌体的弯曲抗拉强度设计值。Combined with the needs of the renovation and protection projects of actual cultural relics,specimens of the manual gray brick masonry with traditional mortars made of lime,lime-sand,mud-lime as bonding materials were prepared and the bending tensile strength test was carried out to analyze the bending tensile failure characteristics and bending tensile strength of the masonry.The results show that the bending tensile failure of the manual gray brick masonry with traditional mortars as bonding materials is the fracture failure at the interface between the blue brick and the mortar in the pure bending zone,and its brittleness is obvious.Moreover its bending tensile strength is significantly lower than that of ordinary brick masonry with modern mortars of the same strength as bonding materials.The calculation formula of the average bending tensile strength in the code was modified by the least square method,and a formula for calculating the average bending tensile strength of the manual gray brick masonry with traditional mortars as bonding materials was established.The design value of the bending tensile strength of this kind of masonry was recommended.

关 键 词：文物建筑 手工青砖 传统灰浆 弯曲抗拉强度 回归分析 

分 类 号：TU362[建筑科学—结构工程]