Refined Analysis For The Hysteretic Energy Of Pipe Truss Structure

The pipe truss structure which is connected by tubular members, is widely used in engineering because of its large span, light weight, elegance and convenience in construction. The main connecting mode of the pipe truss structure is tubular intersecting joint, and connecting mode is the key to steel tube structures. In order to research the seismic performance of pipe truss structure, it is essential to understand the tubular intersecting joint and the hysteretic performance of pipe truss structure in low cyclic loadings. Based on the fact that the analysis and design methods of the energy can truly reflect the response during whole process and elastic-plastic development of structure under the action of strong earthquake, hysteretic energy dissipation, as an important form of energy consumption after entering the nonlinear for structures, is the most engineering significant energy barometer. This article will focus on researching the hysteretic properties of pipe truss structure and energy consumption.Research on hysteretic performance of tubular intersecting joints and energy consumption capacity is conducted. In the ANSYS establish K-joint shell element model and make the numerical simulation under low cyclic loadings, analysis of the hysteretic performance and energy distribution in the ANSYS, it is found that the hysteretic performance of joints is good, there is no obvious ‘draw shrinkage’ phenomenon. To further research the influence factors of joints’ hysteretic performance, we can analyze the parameters by changing the material yield strength, wall thickness, diameter, or strengthening the inner diaphragm. Comparing of hysteresis curves, skeleton curves and energy dissipation area curves, it is found that if we increase the yield strength of the material and the diameter of the pipe, the energy dissipation capacity of joints is also increased accordingly. Increasing the main pipe wall’s thickness can improve the energy dissipation capacity of the tubular joints. And strengthening inner plates in different positions has little influence on the energy dissipation capacity of the tubular joints.Research on the hysteretic behavior and energy dissipation capacity of plane pipe truss is conducted. To set up the traditional truss beam element model of plane tube and consider the phase of tubular joints in elaborate shell element model, and design two loading modes, which are ‘joints on bent and cross under cyclic loading’ and of ‘first order vibration shape of cyclic loading’, by using the advantages of the refined model, the energy dissipation of the joints and the bars are obtained respectively. It is concluded that the energy dissipation capacity of the flat pipe truss is good, the plastic strain energy is much larger than the elastic strain energy, and the effect of the energy dissipation of the joint in the two loading modes cannot be ignored.Research on the hysteretic behavior and energy dissipation capacity of space tube truss is conducted. Using the same methods, establish two kinds of fine degree of different space tube truss model and analysis the hysteretic performance and energy consumption under cyclic loading on two cross nodes and the first-order vibration mode cyclic loading respectively. In addition, by inputting seismic waves, we studied the energy dissipation of space truss structure, it is found that the space tube truss structure has good energy dissipation capacity. Under the three different loading modes, the plastic strain energy is larger than the elastic strain energy, and the energy dissipation function of the tubular intersecting joint cannot be ignored.