地基冻胀条件下碗扣式模板支架稳定承载力分析  

Analysis of Stability Bearing Capacity of Framework with Cuplok Brackets Under the Condition of Ground Frost Heave

作　　者：徐嫚[1] 李晓明 刘昌永[2] 魏晨阳 王庆贺 XU Man;LI Xiaoming;LIU Changyong;WEI Chenyang;WANG Qinghe(School of Civil Engineering,Northeast Forestry University,Harbin 150040,China;Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education,Harbin Institute of Technology,Harbin 150090,China;School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]东北林业大学土木工程学院,哈尔滨150040 [2]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,哈尔滨150090 [3]沈阳建筑大学土木工程学院,沈阳110168

出　　处：《工业建筑》2022年第1期108-115,共8页Industrial Construction

基　　金：国家自然科学基金(51808351);天津市科技计划项目(18ZXGDGX00030);沈阳市科技局项目(RC200143)

摘　　要：碗扣式模板支架作为施工临时钢结构,工程中经常忽略了支架地基处理的重要性,由于温度降低及土体含水量较多等多种因素引起土体冻胀现象,造成支架地基隆起,严重危害支架施工安全。为研究支架地基隆起下碗扣式支架的实际受力性能,基于多节间连续压杆理论分析架体高度与允许隆起位移的关系,通过采用ABAQUS建立碗扣式支架模型,对支架地基隆起影响下碗扣式模板支架受力性能进行分析。研究结果表明:支架地基隆起后,碗扣式支架稳定承载力下降最大达57.92%,为单杆失稳破坏;失稳破坏时,支架稳定承载力与立杆隆起根数相关性较小,与隆起处立杆的自身刚度相关性较大;角部立杆基底地基隆起下允许隆起位移最小,中部立杆基底地基隆起下允许隆起位移最大;立杆的允许隆起位移随架体高度的增加而增大。As a temporary steel structure in construction,the importance of treatment for the foundation of framework is often neglected in engineering.Due to many factors such as the decrease of temperature and the high moisture content of soil,the foundation of framework is prone to heave which seriously endangers the construction safety of supporting frame.In order to study the actual mechanical properties of framework with cuplok brackets on the heave foundation,the relations between the height of framework and the allowable heave displacement was analyzed based on the theory of multi-segment continuous compression bars,and the model of framework with cuplok brackets was established with ABAQUS.The results showed that the stability bearing capacity of the framework decreased up to 57.92%after the foundation was heaved,which was the instability failure of a single rod;when failure occurred,the stability bearing capacity of the framework was less related to the number of heave members than to the stiffness of the heave members;the allowable heave displacement was the smallest under the condition of heave of upright rods at foundation corner while the allowable heave displacement was the maximum under the condition of heave of upright rods at the middle of foundation;the allowable heave displacement of the uprighty rods increased with the height of the framework.

关 键 词：碗扣式模板支架 地基冻胀 允许隆起位移 稳定承载力 

分 类 号：U445[建筑科学—桥梁与隧道工程]