Study On Seismic Performance Of Assembled Phosphogypsum-concrete Composite Wall Structur

Phosphate gypsum is a kind of acid industrial solid waste extracted from the high concentration of phosphate fertilizer,which has the characteristics of low utilization rate and difficult utilization.At the same time,China is the world’s largest production of the country,annual output and accumulated stock is always high,long-term storage will not only cause a lot of idle land resources waste,will also is bound to China’s ecological environment and the sustainable development of related industrial chain produce serious harm,so the comprehensive utilization of phosphogypsum is of great significance.In recent years,under the guidance of relevant national industrial policies and environmental protection policies,the utilization rate of phosphogypsum in China has been improved to a certain extent,but by 2022,the comprehensive utilization rate of phosphogypsum in China is also less than 48%.At present,the most widely used field of phosphogypsum resources in China is the building materials industry.There are still more than half of the phosphogypsum piled up idle every year,one of the main reasons is that phosphogypsum itself is difficult to use and the utilization technology is not mature.Based on the abovereasons,thispaper proposes a new technology usingphosphogypsum,namely the combined wall structure of prefabricatedphosphogypsum-concrete,which is mainlyused in the field ofconstruction.Verifying the feasibility of traditionalphosphogypsum was necessitated by its inadequate seismic performance and weak strength.This study’s primary research and findings are as follows(1)In order to improve the strength of composite phosphogypsum material and better apply it in the field of construction engineering,this paper is based on the composite phosphogypsum material of original phosphogypsum and half water phosphogypsum proposed by the research group.Through single factor test,the influence of the relative dosage of original phosphogypsum and half water phosphogypsum on the strength of composite material is studied,and then the influence of the relative dosage on the specimen strength is revealed,and finally get the optimal ratio of raw phosphogypsum and half water phosphogypsum used in this text.(2)Carry out the mechanical properties test of each component material of the new prefabricated phosphogypsum-concrete combined wall board,determine the mechanical properties indexes of each material,and establish the constitutive relationship model of the composite phosphogypsum material.(3)Design and production of new prefabricated phosphogypsum-concrete combined wallpanels,and carry out experimental research on the seismic performance of combined wallpanels.First,the test scheme is designed to carry out the low-cycle reciprocload test of combined wallpanels;second,basedonthe energy consumption and damage mechanism of stress distribution of wallpanels,compression damagedistribution,stagnationcurve,damage patternorshape.The feasibility of phosphogypsum-concrete composite wall panel engineering is verified,as evidenced by the testresults.(4)Based on the prefabricated phosphogypsum-concrete composite wall board structuredesign,establish the corresponding fine finite element analysis.Under the framework of finite element analysis,the model should be tested at a low cycle level and,upon the results and occurrences,the rationality and precision of the finite element model should be verified.For this composite wall board,a reasonable and effective finite element numerical calculation technique is available.In this study,several key problems such as the relative mixing amount of original phosphogypsum and half water phosphogypsum in composite phosphogypsum material,the constitutive model of each component material,wall board structure design,seismic performance,and finite element analysis method were studied.Based on the hysteresis test of combined wall board,the failure mode,energy consumption and failure mechanism are discussed,and the refined finite element analysis method is established to provide theoretical and technical support for the engineering application of phosphogypsum resource recovery and assembled combined wall board.