| The rapid development of prefabricated structure has promoted the level of construction industrialization in China.The prefabricated structure has the advantages of high economic benefit,short construction cycle,environmental protection and low energy consumption.The herringbone composite wallboard studied in this topic belongs to the category of prefabricated structure.The wallboard is a load-bearing wallboard composed of reinforced concrete herringbone and frame column as main load-bearing components,and then foam concrete as filling material is poured into the closed area formed by herringbone and frame column.The horizontal connection mode between the wall panels is cast-in-place constructional columns.The cast-in-place constructional columns and vertical frame columns are combined to form abnormity frameworks of different shapes.The upper and lower frame beams and cast-in-place floor slabs form composite frame beams,forming a frame structural system with integrated special-shaped columns.The wall panels reduce the self-weight by filling the foam concrete,and at the same time,the members bear the load together with multiple anti-seismic defense lines,and have better load-bearing capacity and anti-seismic capacity.In this paper,pseudo-static test and finite element simulation analysis were carried out on the composite wall(numbered FB-2)with T-shaped and cross-shaped columns on both sides respectively.The failure mechanism,bearing capacity,stiffness,ductility and other mechanical properties of the wall panel were analyzed in detail to verify the correctness of the finite element simulation.This paper focuses on the optimization design of the internal joints of herringbone braced composite wallboard,establishes six models by using ABAQUS software,controls a single variable,adds a concrete reinforcement area at the model joints and changes the reinforcement at the internal joints of the board,compares its mechanical properties,and obtains the final optimization scheme by synthesizing its advantages.The main research contents and results are as follows:(1)Due to reasons such as laboratory space limit FB-2 1/2 scale model specimens used,FB-2 specimens for pseudo static test,observe the specimen damage and record,in different stages of the analysis of wall failure pattern and the characteristics of node,it is concluded that hysteresis curve,ductility,rigidity degeneration of wallboard,bearing capacity and so on to conduct a comprehensive performance study.The test results show that the failure sequence of the composite wall panels with prefabricated herring brace is "foamed concrete-herring brace-beam hinge mechanism-combined special-shaped column".(2)The software ABAQUS was used to build a model of the same size as FB-2specimen,and the seismic capacity of the FB-2 model was analyzed,and the failure cloud image was compared with the test failure mode.The results show that the FB-2 model of skeleton curve,ductility and rigidity,bearing capacity,damage cloud results agree well with the test results,and the errors of bearing capacity and ductility coefficients are all within 10%.(3)Six models were established by ABAQUS software to optimize the design of FB-2 model,and the variables were respectively the reinforcement of the top joints of the herringbone support,herringbone support top joint reinforcement anchorage position,the herringbone support is reinforced at the bottom node,The top joints of the herringbone braces are reinforced with concrete and the upper frame beam-column node plus axils and other forms.The failure mode,skeleton curve,bearing capacity and ductility of the composite wall panels are compared,and the optimization scheme of the assembled herringbone bracing composite wall panels is proposed. |
