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三种孔洞形式空心砖砌体力学性能试验研究*
赵祖芳,李碧雄,唐甜,牟兵雄
摘 要

(四川大学建筑与环境学院, 成都 610065)

[摘要]基于抗压强度试验和劈裂试验,研究了成都地区三种典型孔洞形式的烧结页岩空心砖砌体的抗压和劈裂抗拉性能,测试抗压和抗拉强度指标,观察其受力变形破坏过程,深入分析了不同孔洞形式的烧结空心砖砌体破坏机理。空心砖砌体抗压强度低,离散性大,其受压破坏取决于砌体内最弱的砖的力学性能,破坏形态多样,破坏位置不确定,且孔洞形式对其破坏过程和破坏形态有一定的影响;劈裂破坏以沿中间破裂为主要破坏形态,个别因垫条处砖局部受压而破坏,两种破坏形态都开始于砖内裂缝,劈拉强度主要受控于砖的强度,实测的三种型式空心砖砌体劈裂抗拉强度离散性较大。试验结果科学地解释了地震中空心砖砌体的易损现象。综合试验结果,给出了建议的空心砖砌体抗压强度理论计算公式。

[关键词]空心砖砌体; 孔洞形式; 抗压强度试验; 劈裂试验; 破坏机理

中图分类号:TU362文献标识码:A文章编号:1002-848X(2018)06-0040-06

 

Experimental study on mechanical properties of three different types of hole forms of hollow brick masonry

Zhao Zufang, Li Bixiong, Tang Tian, Mou Bingxiong

(College of Architecture and Environment, Sichuan University, Chengdu 610065, China)

Abstract:A series of axial compression tests and split tests on fired hollow brick masonry with different hole forms in Chengdu region were carried out to evaluate the compressive and tensile properties. Both compressive strength and tensile strength were tested. The compressive or tensile failure mechanisms were investigated based on the damage evolution of the three types of holes form of fired hollow brick masonry during testing. Hollow brick masonry presented low compressive strength and its high dispersion ratio, the behavior of this kind of masonry suffered compressive load is almost depended on the weakest brick unit, and the failure part is mainly located in the weakest unit; the ultimate damage location and failure forms of all specimen are quite different from one to another specimen due to the uncertain mechanical properties of each hollow brick. Rupturing along the midline is the main destruction form in split test, even though a few specimens failed due to local compressive crushing to a hollow brick. The two kinds of destruction forms are beginning with the crack in the brick, and the tensile strength is controlled by the strength of the brick. The splitting tensile strength in the three kinds of samples indicates an obvious discreteness. The vulnerability of hollow brick masonry in earthquake were scientifically explained by the results mentioned above. A recommended formula for the calculation of the compressive strength of hollow brick masonry is proposed based on the experimental results.

Keywords:hollow brick masonry; hole form; axial compression test; splitting test;  damage mechanism

 

*四川省应用基础计划(2014JY0186),省学术带头人培养基金(川人[2015]100-1)。

 

通讯作者:李碧雄,博士,教授,硕士研究生导师,Email:libix@126.com。

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