Hong Gang Lei

The Connection Technology between Steel Structure and Wooden Antiqued Components

Sheli Tower in Jing chuan county is a steel frame system, whose connected construction between steel components and antiqued components is very complex. Considering the construction difficulties of Sheli Tower,this paper introduces how to fix the wooden brackets by using welding screw and steel sheet that connected with the columns and the method of packaging the steel eaves purlins into cornice with wooden antiqued components.These solutions ensure the union of force and architectural form, accurately comply with the architecture of Tang style.

The Fatigue Properties of the M27 Higher Strength Bolt in the Grid Structure with Bolted Spherical Joints

Under the suspended crane loading, the key to the fatigue of the grid structure with bolt-sphere joints is the fatigue of the higher strength bolt. By now, there are not any research reports about the fatigue properties of M27 higher strength bolt at home and abroad. With the aid of the fatigue-testing machine and the loading device, this paper will have 8 constant amplitude fatigue experiments on test-piece, and will get the S-N curve of the higher strength bolt. With the aid of the metallographic analysis, this paper studies the mechanism and influencing factors of the fatigue failure; and with the aid of the finite element software ABQUAS, it analyzes and gets the stress concentration factor of the M27 higher strength bolt, and verifies the position of the fatigue failure.

The Appraisal and Strengthening Design of a Large Adding Layer Supermarket

This paper takes a large supermarket as the research object. Based on its adding layer directly without identification, these implementations including reviewing design drawing, witnessed inspections, indoor test and theoretical analysis are carried. The identification results show that: the layer-adding design has a serious problem on the conception; part of the foundations short concrete column misplaced seriously to its upper concrete column whose maximum is up to 50mm, and between the gap, there are some obvious weak positions existing some crossing pipelines which are filled completely with cement mortar; part of the concrete columns tails have serious phenomenon of cellular pits; the upper steel structures support system is imperfect and unreasonable; the seismic capability of the blindly adding layer structure could not meet the national codes requirements. Based on the above structure defects, this paper ensure the safety of the adding layer structure through sticking steels reinforcement method, section enlargement method and adding some structure s support system.

Analysis on the Causes of Fatigue Accidents of a Bolt-Ball Structure Plant in Shanxi

This paper take a bolt-ball node network frame factory building collapse in shanxi as the research background,it suddenly had a partial collapse after used 13 years. Based on the field testing,fracture analysis and theoretical calculation with the finite element analysis software ABAQUS and MIDAS,including the simulating of the M33 high streng bolt’s stress concentration factor and the analysis of the grid structure’s force conditions, we found the cause of the high strength bolt’s fatigue fracture ,and finally,we concluded that this was a rare low cycle fatigue destruction under the action of indirect dynamic load.

Brief Discussion about the Changsha Yuan Da Steel Structure Residence System

The study of the steel structure residence system has always been not only the hot part but also the difficult part in Chinese steel structure research area recent years. With theresidence industrialization getting more and more popular, the steel structure residence will get into a rapid developing period. The steel structure residence system of Chang Sha Yuan Da is well-known domestically and internationally, also have gotten the different responses. This paper puts focus on the analysis of the advantages and the disadvantages of this system, and have proposed some recommendations for the future modifications of this system.

Seismic Analysis of a High Rise Antique-Style Pagoda with Steel Reinforced Concrete Composite Structure

In this paper, we analyze the dynamic and seismic performance of a high rise antique-style pagoda by using the response spectrum analysis and the time history analysis method, which are implemented in finite element software. The result of our system can provide a reference to the structural designer to ensure the structure of such architecture meets the seismic fortification requirements.

Theoretical Analysis and Experimental Verification of the Stress Concentration Factor at the Steel Tube-Welded Hollow Sphere Connection Node

In this paper, the author uses ANSYS, the software of finite element analysis, to establish the finite element model, the hot spot stress value of different connection structures of steel tube-welded hollow sphere under uniaxial elongation has been analyzed, the theoretical stress concentration factor of this joint has been obtained. Through the static test on the four typical test-piece, 26 steel tube-welded hollow spherical nodes in total, the actually measured stress concentration factor of the joints has been obtained. The theoretical analysis basically coincides with the law of stress concentration factor obtained from the test results.

The Static Analysis about Complicated-Welded on Tubular Rectangle-Joints

Welded rectangular steel tubular joints have been widely used in large span complicated steel structure engineering .With the type of the joints and structural measures complicated, there is no suitable joints theory formula in design specifications. In this paper, two different structural measures types of umbrella steel truss # 8 joints and 68 # joints in a Railway Station are static analysis ,which is by means of finite element software ANSYS and based on the principle of the joints member loading simultaneously. The analysis results show that: in the case of the joints member loading simultaneously, the carrying capacity variation of each member is not uniform coordination; With the different angle between the branch pipe of joints and main pipe, the changes of the degree of stress concentration in the four side surfaces of the member is different. The maximum difference is about 2-fold; compared 68 #joint with 8 # joint, its degree of stress concentration on the overall is small, which prove that structural measures of its domain joints is reasonable.

Research on Impact Response and Failure Modes of H Section Steel Frame Columns Subject to Blast Loads

Using finite software ANSYS LS/DYNA for simulating the impact response and failure modes of H section steel frame columns subject to blast loads，and loading different load conditions, changing column boundary conditions and web plate thickness. Conclusion: the failure model of steel columns changes with the change of load form,steel columns will be easy to occur shear failure in the end by the dynamic load, and the flange will be easy to occur bucking failure in local by impulse load; In the case of same size and web thickness, increase the web thickness can reduce the deformation of column effectively, improve the capability of H section steel column resist the blast load.

Constant Amplitude Fatigue Calculative Method of Welded Hollow Spherical Joint with Cross-Board in Steel Plate-Type Grid Structure

The fatigue of grid structures with welded hollow spherical joint under suspending cranes is an issue in both academic and engineering fields at home and abroad. The structural fatigue is mainly caused by the fatigue failure of welded hollow spherical joint with cross-board. In this paper, 16 specimens categorized in KQ-4、KQ-5 and KQ-7were tested stably and efficiently under constant amplitude stress by use of self-designed loading equipment. The testing results show that the form and mechanism of fatigue failure were clarified elementarily. A fatigue curve of welded hollow spherical joint with cross-board, S-N curve, was suggested in this paper based on the statistic regression analysis of the 16 testing results. The constant amplitude fatigue calculation method was established for welded hollow spherical joint with cross-board in grid structure with welded hollow spherical joint by use of allowable stress amplitude method.