丁基防水嵌缝密封胶胶层厚度变化的影响

发布时间 : 2023-1-18 11:15:15
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(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

丁基防水嵌缝密封胶胶层厚度变化的影响

(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

发布时间 : 2023-1-18 11:15:15
Views:

三维实体有限元模型因物理意义明确、直观可视等优点在结构加固领域应用广泛。为获得较高精度，三维实体模型需进行细致的网格划分，模型单元与节点数目巨大。考虑材料的强非线性特性时，需消耗的计算资源大、时间成本高。纤维梁有限元模型因能在满足计算精度的基础上具备较快的建模和求解速度，成为了近年来结构抗震领域的新型计算分析手段。故采用ABAQUS分别建立三维实体模型和纤维梁模型对试验进行数值模拟，结合试验结果分析丁基防水嵌缝密封胶胶层厚度对构件抗弯承载力和界面茹结性能的影响，并比较2种分析方法的计算精度及效率。界面勃结一滑移本构模型已有研究表明，要在有限元模型中精确模拟丁基防水嵌缝密封胶胶层厚度变化的影响，需选用一种合适的界面茹结一滑移本构模型。比选上述文献中提到的几种模型发现，陆新征精确模型n5综合考虑了包括丁基防水嵌缝密封胶胶层厚度在内的多种因素对RP-混凝土界面茹结行为的影响，故选用此模型表征CFRP-混凝土界面的茹结一滑移本构关系。模型中丁基防水嵌缝密封胶胶层厚度通过影响初始刚度K。和界面破坏能Gf，从而对界面茹结性能产生影响，相关表达式为:式中:Ka为丁基防水嵌缝密封胶胶层剪切刚度，Ka=Ga/ta,Ga为丁基防水嵌缝密封胶胶层剪切模量，to为丁基防水嵌缝密封胶胶层厚度;K。为混凝土剪切刚度，K=G/t,G。为混凝土剪切模量，t。为混凝土参与剪切变形有效厚度;a3=0.308;/jW为「RP-混凝土宽度系数;ft为混凝土抗拉强度;f(Ka)为丁基防水嵌缝密封胶胶层刚度对界面破坏能影响函数。各材料性能参数取实测值，模型涉及的其余表达式详见文献。三维实体有限元模型根据实际尺寸建立各部件模型，混凝土选用C3D8R三维实体单元模拟，钢筋选用丁3D2三维析架单元模拟，CFRP布选用S4R弹性壳单元模拟，各材料的力学性能参数取实测值。选用塑性损伤模型表混凝土本构关系，钢筋选用双折线本构模型，CFRP布选用理想线弹性本构模型，根据试验数据定义各材料本构模型相关参数。选用COH3D8内聚力单元模拟茹结丁基防水嵌缝密封胶胶层力学性能，以陆新征精确模型n5表征界面茹结一滑移本构关系。在Interaction模块中设置TIE连接各部件，并进行边界约束。采用“生死单元法”模拟损伤加固梁的预加载、卸载加固及正式加载过程。模拟预加载过程时，将S4R单元和COH3D8单元的弹性模量设置为极小值，即“杀死”模拟CFRP布和茹结丁基防水嵌缝密封胶胶层的单元;完成预加载后，将上述单元材料属J险设置为实测值，即卸载加固过程;最后，模拟加固梁的正式加载过程，如图8所示。www.sdyuantai.com

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