The Research On Failure Modes And Dynamic Response Characteristics Of The Single-layer Reticulated Domes Under Continuous Impact Load

The reticulated domes are divided into single-layer and multi-layer structures.They are widely used in large space public buildings,such as stadiums,exhibition halls,museums and terminal buildings,because of their outstanding stress characteristics,good spanning capacity,colorful structure modeling and convenient for construction.As one of the forms of the reticulated domes,the single-layer reticulated domes have been widely used.However,due to the influence of various human factors and natural disasters,the severe damage and collapse of buildings frequently happen.With the wide application of the reticulated domes in important large-scale projects,their performance under accidental impact loads such as explosions and impacts has gradually become research hotspot.With the rapid development of computer technology and various large-scale general finite element software,scholars from all over the world have completed a lot of researches on failure modes,dynamic response characteristics,failure mechanisms and tests of reticulated domes under impact loads.Although there are many related studies on the performance of reticulated domes under accidental impact loads,and they are relatively mature,the continuity of impact loads has been not considered.However,there are many continuous impact loads in actual engineering,such as continuous falling objects from high altitudes,continuous falling rocks of landslides,and hail.These continuous impact loads are one of the possible loads that cause the failure of the reticulated domes.So studying the failure modes and dynamic response characteristics of the reticulated domes under continuous impact loads have very important practical significance for actual engineering.Based on the research methods and theories of reticulated domes under non-continuous impact loads,this paper makes an further study on the failure modes and dynamic response characteristics of single-layer spherical reticulated domes under continuous impact loads,and focus on studying the influence of continuity of impact loads on the failure modes and dynamic response characteristics of single-layer spherical reticulated domes.The main research work in this paper focuses on the following aspects:(1)Analyzing and determining the analysis method of the impact response of the single-layer spherical reticulated domes under continuous impact loads;(2)Studying the failure deformation characteristics of different types of reticulated dome members and the overall depression range of the reticulated domes under continuous impact load under various working conditions,defining the failure modes of single-layer spherical reticulated domes under continuous impact loads,analyzing the dynamic response characteristics of continuous impact under various failure modes,exploring the continuous impact failure rules of single-layer spherical reticulated domes;(3)Studying the influence of the continuity of impact loads on the failure modes anddynamic response characteristics of different types single-layer reticulated domes,and proposing the design recommendations for the selection of single-layer spherical reticulated domes under continuous impact load based on the combined failure modes and dynamic response characteristics;(4)Through the comparison and analysis of continuous impact test and numerical simulation of welded hollow spherical joints,the continuous impact resistance of welded hollow spherical joints is studied,and the rationality of numerical simulation is verified;(5)Through the experimental study of K6 single-layer spherical reticulated dome under continuous impact load,the deformation characteristics of welded hollow spherical joints and rods of reticulated dome and the continuous impact dynamic response characteristics of the whole reticulated dome are tested and studied when the failure mode of the reticulated dome is partial depresssion.