岩棉复合保温外模板承载力及温度效应分析

Bearing capacity and temperature effect of rock wool composite insulation external formwork

为了提高建筑外围护结构施工效率及解决传统外保温系统长期存在的易脱落和易着火问题,提出了一种集保温和建筑模板于一体的岩棉复合保温外模板(RW-CIEF)体系。RW-CIEF由内到外依次为内侧加强层、岩棉保温芯材、黏结层、保温过渡层以及外侧加强层。以哈尔滨市为例,基于全寿命周期成本(life cycle cost,C lc)确定了岩棉保温芯材的最佳厚度。采用有限元分析与理论计算相结合的方法探求了RW-CIEF在工程中的可行性,分析了RW-CIEF的抗弯性能、施工承载力及温度效应下的应力和变形,讨论了开槽形式、开槽宽度、开槽深度以及开槽间距对RW-CIEF抗弯性能的影响。结果表明:RW-CIEF的抗弯性能理论计算结果与有限元分析结果有较高的一致性;开槽处理可有效提高RW-CIEF的抗弯性能,综合抗弯性能、热工特性及加工角度,建议开槽形式选用对应开井字槽或对应开纵槽,开槽深度和宽度均为10 mm,开槽间距为150 mm;设计的RW-CIEF满足施工承载力,可保证外围护结构保温工程施工质量;由温度效应产生的最大拉应力和压应力均未超过RW-CIEF的外侧加强层承载力,反映出RW-CIEF出现夏季空鼓或冬季开裂现象的可能性极小。提出的RW-CIEF体系可为外围护结构保温工程及建筑模板工程未来研究方向提供一种新的思路和方法。

To improve the construction efficiency of building envelope and solve the long-term problems of falling off and ignition of traditional external insulation systems,a kind of rock wool composite insulation external formwork(RW-CIEF)system integrating insulation and building formwork was proposed.The RW-CIEF structure from inside to outside was designed as follows:inner reinforcing layer,rock wool insulation core material,adhesive layer,insulation transition layer,and outer reinforcing layer.Taking Harbin as an example,the optimal thickness of rock wool insulation core material was determined based on the life cycle cost(C lc).The feasibility of RW-CIEF in engineering was explored by combining finite element analysis with theoretical calculation.The bending properties,construction bearing capacity,and stress and deformation under temperature effect of RW-CIEF were calculated and analyzed.The influences of groove form,groove width,groove depth,and groove spacing on the bending properties of RW-CIEF were discussed.Results showed that the theoretical calculation results of bending properties of RW-CIEF were in good agreement with the finite element analysis results.The grooving treatment effectively improved the bending properties of RW-CIEF.Considering the bending properties,thermal characteristics,and processing angle,groove forms of symmetrical cross grooves or symmetrical longitudinal grooves were suggested,with the groove depth and width of 10 mm and the groove spacing of 150 mm.The designed RW-CIEF met the construction bearing capacity and could fully guarantee the construction quality of the thermal insulation works of the outer enclosure structure.The maximum tensile stress and compressive stress caused by temperature effect did not exceed the bearing capacity of the outer reinforcing layer of RW-CIEF,which indicates that RW-CIEF is unlikely to hollow in summer or crack in winter.The proposed RW-CIEF system can provide a new idea and method for the future research directions of exterior envelope insulation and building formwork engineering.