Study On Urban Residential Construction Project Cost Index

Earthquake is one of the major natural disasters which threat to human life and property safety. Building construction is closely related to human life. Therefore, the seismic design of buildings is especially important. With the improvement of human skills and living requirements, high-rise building is more and more common in the modern society. However, the once high-rise building is destroyed in the earthquake, the easier to cause great loss of life and property. This requires the higher standards of safety in the seismic design of buildings. Typically, when structure designers make seismic design for engineering structures, they usually choose the previous numbers of modes as the earthquake considered, and the choice is made in accordance with the seismic code and high-level structure specifications. It's not considering for the impact of higher mode in seismic design. This paper is focused on research consider the importance of high vibration order influence.Firstly, this paper describes the home and abroad background of the subject, shows the problems in our country. This leads to the purpose and research significance of the paper. Then it focused on several methods of seismic design and showed the method about the analysis of this paper. The third part is to selected some common forms of high-rise building structures now. Such as frame, frame-shall wall structure. Through the researches of higher modes in this two structures to highlight the influence of high vibration model of shear wall structure seismic design.Secondly, this essay selects an actual high building with shear wall, and analyzes the model using SAP2000. When put the first 12 orders into earthquake-resistant calculation, the quality coefficients of the X and Y directions, which are not less than 90% in coefficient requirements, both can satisfy the standard. By selecting representative numbers of vibration model into calculating, that the more the calculating vibration model numbers were trying, the smaller the cumulative value of the quality coefficients of the same vibration model was found. When the coefficient assigned to the fundamental mode was in the low, the influences of high-order mode were more notable. For cycle, the higher the numbers of participate in calculation mode, the bigger the cycle of the same vibration modelThirdly, this essay does some dynamic analysis for the shear wall structure model according to different fortification intensity and different vibration model. The results of comparison show that, high vibration model have notable influence to the top of structure and near the bottom layer, and the influence to the top shear is more than basal shear; the influence of high order modes to upsetting moment and vertex displacement is very small.Finally, this essay does some summary and advice for the influence of the high structure to the seismic design for shear wall:when the basic cycles of structure into speed sensitive segments or displacement sensitive segment, the influence of high vibration model should be paid more attention; for shear wall structure which have obvious bending deformation features, high vibration model cannot be ignored.