The Static And Quasi-dynamic Analysis Of H-beam Support Of The Diaphragm Wall And The Stability Checking

Tianjin cultural center traffic hub project are largely underground s tructure, in which the diaphragm wall is used in some part of the underground structure of the third section, and the supporting structure consists of H-beam and the adjacent frame structure. This paper mainly analyses the strained condition of H-beam before the diaphragm wall, which includes the static and quasi-dynamic analysis of the strained condition, and then through the calculations checks the stability of the supporting structure o f the d iaphragm wall.Duringt he s tatic a nalysis, usingt wo d ifferentw ays o fh and c alculationa nd Fspe5, calculate the earth pressure division of the support structure of the diaphragm wall, and then calculate the force of the steel support under the two calculation results based on the equivalent beam method, finally obtain the support number and size required under the two conditions; In addition, the paper makes the force analysis of the steel support as well, and makes some a ssumptions a nd improvement about the position of the support.During the quasi-dynamic analysis, mainly consider the influence of dynamic load to the support, and at the same time analyze the stress state of the support under the dynamic lo ad. The experiment uses the s train-gage electricallo gging m ethod, and chooses 3 measuring points on the H-beam, then measure the strain value at the top and bottom surfaces when the chosenpoints a re under the dynamic loading. At the same time, simplify the H-beam support as the two ends are effected by the axial force and bending moment, and then according to the result of the strain data work out the axial force and bending moment. Through the structure analysis, we can find that the influence of dynamic load to support is smaller than the earth pressure, so the safety factor should not be too large considering a number of experimental datas, or the waste of constructional materials even the delay of working will appears.At the end of the paper, we conclude the two force analysis above and check the stability of the diaphragm wall. According to the static analysis and the result, we can find that work on the site is conservative, and materials used are wasteful, at the same time, the frame construction before the diaphragm wall props up well. Based on the dynamic a nalysis, the d ynamic load in t he p roject has a n e ffect o nly 11.4% on the yield, and during designing the extra quantity should be chosen after considering the factor of the dynamic load. In the stability checking, the result that the support in the project meets the standard can be concluded, and the structure is safe. Of course, the defects must exist in the result for the result of human error and apparatus o f experiment, but the result is i nt he control and at the same time, to obtain more accurate results, it needs the followers practice more testing and checking.