Abstract
The building finish layer is a comprehensive structural system including the building exterior insulation system and building exterior finish. Combining with buildings has the advantage of reducing wall heat loss and building deformation caused by large temperature differences. Since the building finish layer is prone to cracking, hollowing, and peeling, during the application process, its safety needs to be studied and certified. This study prepares 20 groups of specimens, 15 anchor bolts in each group. The anchor bolt pull-out strength test is carried out. Anchoring damage evolution law and failure mode of anchor bolts are investigated. And the influence of anchoring methods on the pull-out bearing capacity is analyzed. In addition, ABAQUS finite element data simulation is carried out. The stress state of finish in thermomechanical coupling condition and without the effect of temperature are compared and analyzed. The influence factors of anchor bolt pull-out strength and the influence of temperature load on the long-term performance of building finish layer are obtained. The durability of the building finish layer is analyzed. The results show that the anchoring strength of the anchor bolt is positively correlated with the anchoring depth. The anchoring strength is influenced significantly by anchoring construction sequence and temperature. The stress under the coupled effect of temperature and load is greater than that of the single effect of load, and the stress distribution changes significantly. Due to thermal expansion and contraction, the anchor bolt would loosen, which is more prone to damage the building finish layer in a low temperature environment. The weight relationship of each influencing factor of the building finish layer is proposed. A systematic evaluation index system is established. The results of this study provide a basis for subsequent related research work and engineering applications.
Highlights
Academic Editor: Francesco Colangelo e building finish layer is a comprehensive structural system including the building exterior insulation system and building exterior finish
ABAQUS finite element data simulation is carried out. e stress state of finish in thermomechanical coupling condition and without the effect of temperature are compared and analyzed. e influence factors of anchor bolt pull-out strength and the influence of temperature load on the long-term performance of building finish layer are obtained. e durability of the building finish layer is analyzed. e results show that the anchoring strength of the anchor bolt is positively correlated with the anchoring depth. e anchoring strength is influenced significantly by anchoring construction sequence and temperature. e stress under the coupled effect of temperature and load is greater than that of the single effect of load, and the stress distribution changes significantly
Based on the research status of the above building finish layer, this study carried out anchor bolt pull-out strength tests and finite element analysis results. is study prepares 20 groups of specimens, 15 anchor bolts in each group. e influence of anchoring depth, anchoring construction sequence, and temperature on anchoring strength is obtained
Summary
Considering the influence of temperature changes on the anchoring strength of anchor bolts, the anchor bolt pull-out strength tests under different ambient temperatures are designed. Is is because the thermal expansion coefficients of the aerated concrete block and the anchor bolt are different, resulting in temperature deformation, the extrusion force between the anchor bolt and the block is reduced, and the pull-out resistance is reduced. E comparison of pull-out strength test data and simulated data under different anchoring depths is shown in Figure 13. e comparison shows that the simulation data iare 4.82% larger than the test data, and the simulation analysis agrees with the test data. erefore, it can provide data support for the subsequent modeling and analysis of the finish layer
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