In order to reduce the torsional coupled effect , the paper brings forward that knightheads setting along the transverse direction can improve the aseismic property economically and effectively
2.
In the second part , the transfer matrix method to calculate the critical speed , the mode and the unbalanced response , is presented . and the torsional vibration and lateral - torsional coupling vibration problem is discussed briefly
3.
The analysis on unilateral , bilateral and lateral - torsional coupled seismic response of base - isolated structures with combined isolation systems is carried out , and the control of lateral - torsional coupled seismic response of structures is discussed . the energy analysis on base - isolated structures is conducted by energy method . the influence on the total input earthquake energy owing to the frequency , intensity and lasting - time of earthquake and so on is studied
4.
In order to develop and consummate the analysis theory and calculation method of base - isolated structures , based on the research on restoring force model of isolation systems and the analysis on the nonlinear seismic response of base - isolated structures , the analysis on multi - dimensional and lateral - torsional coupled seismic response of base - isolated structures is developed in this paper . according to the mechanical performance of isolation systems , detailed analysis and improvement of the present research , an unilateral and a bilateral coupled visco - elastic hysteretic model for rubber bearings , an unilateral and a bilateral coupled visco - elasto - plastic differential hysteretic model for lead rubber bearings , an unilateral and a bilateral coupled modified visco - plastic differential hysteretic model for sliding friction bearings are proposed
5.
The control of lateral - torsional coupled seismic response of structures is discussed . the analysis on unilateral , bilateral and lateral - torsional coupled seismic response of base - isolated structures with sliding friction bearings is carried out . the influence on lateral - torsional coupled seismic response of base - isolated structures due to the excentricity and the uncoupled period ratio of the superstructure is investigated , and the control of lateral - torsional coupled seismic response of structures is discussed
6.
The response of multi - storey regularly asymmetric building excited by two directions earthquake is researched . and the torsional coupling response influenced by the strength eccentricity is discussed . the response of the rc frame excited by two directions earthquake is simulated using fiber models
7.
The spatial member - story model is adopted as the dynamic analysis model for base - isolated structures by considering the isolation device as a special element , the dynamical equation is established , time - history analysis is conducted by step - by - step integration and iteration methods , and program of dynamic analysis on base - isolated structures ( dabis ) which can be used for analysis on multi - dimensional and lateral - torsional coupled seismic response of base - isolated structures is worked out
8.
The response of the structures will be translational as well as torsional because of the asymmetric - plan that caused by the irregular distribution of the mass and the stiffness so that the center of the inertia force and the resistant force will be unlined . the torsional coupling response will induce the structure ' s dimensional effects that are not easy to be resolved in the two dimensions
9.
The analysis on unilateral , bilateral and lateral - torsional coupled seismic response of base - isolated structures with lead rubber bearings is carried out . the maximal displacement of the bearings is studied . the influence on lateral - torsional coupled seismic response of base - isolated structures due to the excentricity and uncoupled period ratio of the superstructure , and the excentricity of the isolation system is investigated
10.
Some helpful conclusions were made . based on the experimental results and theories research , the author put forward some valuable conclusions of this new type of frame - bent structures : ( 1 ) the initial force calculation method considering the lateral torsional coupled ; ( 2 ) the design and construction method of the high - strength concrete frame - bent columns under the high axial compression ratio ; ( 3 ) the construction method of the abnormal joints
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