Normative Design Differences In Single-limb Cantilever Sculpture Steel Structure Between Chinese And American

Since the adoption of reform and opening-up policy,especially in the underground of the “the Belt and Road” national strategy,the opportunities for Chinese companies to undertake foreign construction projects by participating in international bidding spring up.However,due to differences in industry standards related to Chinese and foreign-related design codes,unnecessary technical obstacles are created in the communication process between the two parties.It also affects the scientific and reasonable quotation and comprehensive competitive advantage of the project to a certain extent.Therefore,a series of systematic research on the differences in current standards in the field of the steel structure in representative Chinese and American codes is carried out.The main contents are as follows:(1)The differences of steel grades and sections for steel structures in the two countries are compared after arranging the current steel industry standards and regulations in China and the United States comprehensively.It is found that in terms of weldability,Chinese steel is superior to American steel.The mechanical indexes of Chinese steel are lower than those of American steel.The grades and the modulus of steel are quite different.China uses metric units as the basic modulus,while the United States is the British system.(2)The single-stem cantilevered sculpture steel structure is mainly affected by wind load and earthquake action.This paper compares the differences between Chinese and American codes on the concept of these two loads and load combinations.A square sculpture in Beijing is selected as an example to calculate the wind load and earthquake effects.The results show that the wind load value according to the US codes is significantly higher than the Chinese codes under the same wind conditions,In terms of earthquake activity,the concept of earthquake resistance in the codes of the two countries are different.China’s codes take "three-level,two-stage" seismic fortification into consideration and the US code is only for single-stage seismic fortification,but the final value of seismic calculation is similar.(3)In order to figure out the differences in steel structure design between Chinese and American cantilever sculptures quantitatively,500 sets of cantilever members are designed according to the Chinese and American standards in Beijing according to the cantilever angle,the external body type,the length of the components and the section form(square pipe and round pipe).After comparing the steel structure design specifications,it is concluded that when the length of the component increases,the amount of steel consumption in the US standard becomes more and more abundant.The ratio of the amount of steel consumption in the US and China changes with the angle between the cantilever member and the horizontal plane.It decreases first and then increases.(4)Accurate mathematical expressions cannot be proposed for the factors in the ratio of steel consumption are coupled with each other.In order to provide a quantitative reference for subsequent engineering differences between China and the United States,this paper introduces long-and-short-term memory neural network algorithm(LSTM)for 500 groups.Data fitting was performed on the design differences of the components.The design results of a practical engineering cantilever component are verified,and the difference between the steel component design of the bending member as well as the variable cross-section member and its corresponding straight-section straight rod is explored.The verification results prove that the neural network method is effective in the problem.The effectiveness of the application of steel consumption difference in design has been explored in the field of civil engineering intelligent algorithm design,which provides a reference for the comparative analysis of similar problems in the future.