配BFG蒸压加气混凝土砌块砌体基本力学性能数值模拟  

Numerical simulation on basic mechanical properties of BFG autoclaved aerated concrete block masonry

作　　者：陈东方 熊立红[1] 陈国武 罗明康 CHEN Dongfang;XIONG Lihong;CHEN Guowu;LUO Mingkang(Institute of Engineering Mechanics,China Earthquake Administration,Key Laboratory of Earthquake Engineering and Engineering Vibration,China Earthquake Administration,Harbin 150080,China)

机构地区：[1]中国地震局工程力学研究所,中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2020年第2期216-226,共11页Earthquake Engineering and Engineering Dynamics

基　　金：中国地震局工程力学研究所基本科研业务费专项(2016A05,2016A06)。

摘　　要：将蒸压加气混凝土(AAC)砌体填充墙采用薄灰缝专用砂浆砌筑,并在灰缝中配置玄武岩纤维格栅(BFG),可以提高墙体的抗压强度和延性。为了研究配BFG的AAC砌块砌体的基本力学性能,设计了9组27个试件进行抗压和抗剪试验。在试验的基础上,首先分析了砌体的抗压和抗剪性能,给出抗压上升段本构方程和抗压、抗剪强度建议公式;其次运用ABAQUS对砌体的抗压和抗剪性能进行模拟,通过比较模拟结果与试验结果,验证了有限元模型的合理性;最后分析了模型受压时的应力-应变关系,给出抗压下降段本构方程。研究表明:荷载施加处,接触面上剪应力集中是砌体通缝抗剪破坏的主要原因;本构方程可为配BFG蒸压加气混凝土砌体填充墙抗震性能的研究提供参考。The autoclaved aerated concrete(AAC) masonry infill wall was constructed with a special mortar for thin gray joints, and the basalt fiber grid(BFG) was placed in the gray joint to improve the wall compressive strength and ductility. In order to study the basic mechanical properties of AAC block masonry with BFG, nine sets of 27 specimens were designed for compression and shear tests. Based on the test, firstly analyzed the compressive and shear properties of the masonry, gave the compressive rise segment constitutive equation and the recommended formula for compression and shear strength. Secondly simulated the compressive and shear properties of the masonry with ABAQUS, through compared the simulation results with the experimental results to verify the finite element model was rational. Finally analyzed the stress-strain relationship of the model under pressure, gave the compressive descending section constitutive equation. The results showed that the shear stress concentration on the contact surface is the main reason for the shear failure at the place of load application;the constitutive equation can provide reference for the seismic performance study of the AAC masonry infill wall with BFG.

关 键 词：蒸压加气混凝土(AAC) 玄武岩纤维格栅(BFG) 本构方程 ABAQUS 抗震性能 

分 类 号：TU317[建筑科学—结构工程] TU364