Seismic Behaviors Study Of The Olympic Games New Type Suspend-dome Structure

The prestressing suspend-dome structure is a new type structure system; the cable-strut system can availably reduce the displacement and force of the structure, can reduce horizontal force of supports and improve the stability and seismic behavior of the building. This paper focuses on the blanks of suspend-dome seismic behaviors study and combines the Olympic Games badminton hall new type suspend-dome structure engineering, structure seismic behaviors are achieved by theory and experiment measures under different acceleration peak of earthquake,different dimensions of earthquake, considering wave passage affect and lessened of the prestressing.The adjustable cable-strut node is innovated and applied in the test model and the Olympic Games badminton stadium engineering .The geometrical 1:10 experimental model is set up according to the structure design drawings of the suspend-dome of the badminton stadium for 2008 Olympic Games, dynamical features of the two models are tested by three methods, frequencies, modes and ratios are achieved in the test, experimental results and calculation results have little errors, the structure contains intensive mode, the mode is mainly vertical vibration, which presents fan-shaped flap gradually, and every piece of the fan-shaped flap is symmetrical or dissymmetrical.The shaking table tests are finished by the multiple vibration table array system. One-way vertical earthquake wave, one-way horizontal earthquake wave and two-dimensional earthquake wave are opted in the test, 48 cases tests are finished in the paper, the time-history analysis calculations of same cases are accomplished, response results of vertical earthquake wave except the force stress are greater than the horizontal earthquake wave, results of two-dimensional earthquake wave is the maximum. The change rule of acceleration response peak is the shape of the first mode, the maximum of displacement response peak in the center of the shell, the shell bar stress is in the range of material elastic limit when the earthquake grade is 8 degree, the structure has good quake-proof property. The hoop cable force response peak is lower than cable rupture force, but has higher dynamic and static ratio, which indicate cable force will lessen obviously in the earthquake. The structure response rules under earthquake force prove: The seismic calculation of the suspend-dome structure focused on the vertical direction, the horizontal direction seismic calculation should be considered.Considering wave passage affect shaking table test in the big span structure is finished in this paper. The finite element analysis by using multiple support excitation time-history method is accomplished, experimental results and calculation results have little errors. The response peaks in different position have not obviously change under different apparent velocities and same vertical earthquake wave, acceleration response peak, displacement response peak, hoop bar stress response peak and cable force response peak is devalued with the slower of apparent velocity. On the contrary, radical bar stress response peak is increased. The change range in the test is bigger than theory calculationThe influence of seismic behaviors as the stress release is achieved by theory and test measure. There are three prestressing values and two earthquake wave directions, total 12 test cases are finished in this paper. Seismic response peaks change obviously in test than in theory calculation. The change rule is not uniform, more test nodes results increase with stress release, the change rule of response peak rule in different position is steady in different prestressing, the dynamic and static ratio increased obviously with lessening of cable force. The fifth cable is lax when 40% cable force is lessened and two-dimensional earthquake wave is inputted, which is dangerous,so the cable should be strained again.The research results have been successfully used in 2008 Olympic Games badminton hall long-span new type suspend-dome seismic design, make contribution for our country building the first long-span new type suspend-dome structure in the world. Combining theoretical research with important practical engineering reasonable, this paper puts forward effective theoretical basis and test conclusion for this type structure.