압축력과 휨모멘트를 받는 메탈 터치된 기둥 이음부의 구조성능에 대한 실험적 연구 A Experimental Study on the Structural Performance of Column Spliceswith Metal Touch Subjected to Axial Force and Bending Moment원문보기
철골구조물의 기둥이음 형식은 볼트연결이나 용접을 이용한다. 이러한 연결방법에서 부재의 축응력은 덧판의 볼트체결이나, 용접부위 를 통하여 그 응력이 전달되는 것으로 간주하여 설계, 시공되고 있다. 우리나라의 강구조 한계상태 설계기준에 따르면, 기둥 이음부의 고력볼트 및 용접이음은 이음부의 응력을 충분히 전달하여야 하고 이들 항복내력은 피접합재 항복내력의 1/2이상이 되도록 하여야 한다. 다만, 이음부에서 단면 에 인장응력이 없는 경우, 이음면이 절삭 마감으로 밀착되면 소요압축력 및 소요휨모멘트 각각의 1/4은 접촉면에 의해 직접 전달시킬 수 있다고 되 어있다. 반면에, 미국 철강협회설계기준(AISC Specifications and Codes)에서는 기둥이음에서 지압력에 따라 응력이 전달되도록 접촉면이 마무리 되어 있는 경우, 그 위치를 확보하는데 충분하도록 이음되어야 한다고만 되어있어, 설계자의 판단에 따라 압축력은 이음면의 직접접촉(Metal Touch)으로 상부에서 하부로 모두 전달할 수 있도록 되어있고, 또한 압축력과 휨모멘트를 받는 기둥에서는 직접접촉을 통해 최소 25%에서 최대 50%까지의 하중전달이 가능하다. 따라서 기둥이음에서 압축력에 대한 직접접촉의 활용도의 차이가 크고 또한 압축력과 모멘트가 작용할 때의 직접 접촉에 대한 활용도도 그 차이가 최대 25%이므로, 직접 접촉된 이음부의 응력전달 거동에 대한 연구가 필요하다. 본 연구는 축력과 휨모멘트가 작 용하는 기둥에 대해서 이루어지며 실험체의 수는 총 22개이다. 국내의 메탈터치의 평활도인 관리 허용치 1.5D/1000와 한계허용치 2.5D/1000및 AISC에서 제시하는 압축력을 받는 기둥에서의 보강 없는 틈의 한계인 1.6mm에 대해, 본 실험결과와 기존의 허용치를 비교하였다. 그 결과, 상하 부재 간의 직접 접촉을 통하여, 즉 메탈터치를 이용하여 응력을 전달시키면 부재 이음에서 경제성과 효율성이 개선될 수 있다고 판단된다.
철골구조물의 기둥이음 형식은 볼트연결이나 용접을 이용한다. 이러한 연결방법에서 부재의 축응력은 덧판의 볼트체결이나, 용접부위 를 통하여 그 응력이 전달되는 것으로 간주하여 설계, 시공되고 있다. 우리나라의 강구조 한계상태 설계기준에 따르면, 기둥 이음부의 고력볼트 및 용접이음은 이음부의 응력을 충분히 전달하여야 하고 이들 항복내력은 피접합재 항복내력의 1/2이상이 되도록 하여야 한다. 다만, 이음부에서 단면 에 인장응력이 없는 경우, 이음면이 절삭 마감으로 밀착되면 소요압축력 및 소요휨모멘트 각각의 1/4은 접촉면에 의해 직접 전달시킬 수 있다고 되 어있다. 반면에, 미국 철강협회설계기준(AISC Specifications and Codes)에서는 기둥이음에서 지압력에 따라 응력이 전달되도록 접촉면이 마무리 되어 있는 경우, 그 위치를 확보하는데 충분하도록 이음되어야 한다고만 되어있어, 설계자의 판단에 따라 압축력은 이음면의 직접접촉(Metal Touch)으로 상부에서 하부로 모두 전달할 수 있도록 되어있고, 또한 압축력과 휨모멘트를 받는 기둥에서는 직접접촉을 통해 최소 25%에서 최대 50%까지의 하중전달이 가능하다. 따라서 기둥이음에서 압축력에 대한 직접접촉의 활용도의 차이가 크고 또한 압축력과 모멘트가 작용할 때의 직접 접촉에 대한 활용도도 그 차이가 최대 25%이므로, 직접 접촉된 이음부의 응력전달 거동에 대한 연구가 필요하다. 본 연구는 축력과 휨모멘트가 작 용하는 기둥에 대해서 이루어지며 실험체의 수는 총 22개이다. 국내의 메탈터치의 평활도인 관리 허용치 1.5D/1000와 한계허용치 2.5D/1000및 AISC에서 제시하는 압축력을 받는 기둥에서의 보강 없는 틈의 한계인 1.6mm에 대해, 본 실험결과와 기존의 허용치를 비교하였다. 그 결과, 상하 부재 간의 직접 접촉을 통하여, 즉 메탈터치를 이용하여 응력을 전달시키면 부재 이음에서 경제성과 효율성이 개선될 수 있다고 판단된다.
The structural framework design uses high-strength bolts and welding in column splices. However, for the column under high compression, the number of the required high-strength bolts can be excessive and the increase of welding results in difficulty of quality inspection, the transformation of the s...
The structural framework design uses high-strength bolts and welding in column splices. However, for the column under high compression, the number of the required high-strength bolts can be excessive and the increase of welding results in difficulty of quality inspection, the transformation of the structural steels, and the increase of erection time. According to the AISC criteria, when columns have bearing plates, or they are finished to bear at splices, there shall be sufficient connections to hold all parts securely in place. The Korean standard sets the maximum 25% of the load as criteria. Using direct contact makes it possible to transfer all compressive force through it. The objective of this study is to examine the generally applied stress path mechanism of welded or bolted columns and to verify the bending moment and compression transfer mechanism of the column splice according to metal touch precision. For this study,22 specimens of various geometric shapes were constructed according to the change in the variables for each column splice type, which includes the splice method, gap width, gap axis, presence or absence of splice material, and connector type. The results show that the application of each splice can be improved through the examination of the stress path mechanism upon metal contact. Moreover, the revision of the relative local code on direct contact needs to be reviewed properly for the economics and efficiency of the splices.
The structural framework design uses high-strength bolts and welding in column splices. However, for the column under high compression, the number of the required high-strength bolts can be excessive and the increase of welding results in difficulty of quality inspection, the transformation of the structural steels, and the increase of erection time. According to the AISC criteria, when columns have bearing plates, or they are finished to bear at splices, there shall be sufficient connections to hold all parts securely in place. The Korean standard sets the maximum 25% of the load as criteria. Using direct contact makes it possible to transfer all compressive force through it. The objective of this study is to examine the generally applied stress path mechanism of welded or bolted columns and to verify the bending moment and compression transfer mechanism of the column splice according to metal touch precision. For this study,22 specimens of various geometric shapes were constructed according to the change in the variables for each column splice type, which includes the splice method, gap width, gap axis, presence or absence of splice material, and connector type. The results show that the application of each splice can be improved through the examination of the stress path mechanism upon metal contact. Moreover, the revision of the relative local code on direct contact needs to be reviewed properly for the economics and efficiency of the splices.
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문제 정의
, the direct contact in column splice is studied in order to have better understanding for practical situation and the stress transfer in column splice. The purpose of this study is to examine the effect of imperfect contact in column splice on the stress transfer and columns yielding strength. The resut of this study can suggest the column splice which can improve the economical efficiency by using the direct contact.
가설 설정
(2) The CB types are necessarily considered to the appropriate gap width because of the shortage of the strength in splice. If there is an unfit gap in the coui*se of the erection of column, the increase of the load will bring on the sliding at 30% yielding load and the rotation of columns in accordance with the direction of gap.
제안 방법
Finally, to check a possibility of a rotation, one LVDT is installed on the base plate. Because this study is focused on the stress transfer on the column splice, in other words toexamine how much a gap size and a location of a gap have effects on the stress transfer of the column, strain gauges from the minimum 12 to the maximum 24 were attached on the splice, respectively. The test is done to the yield condition of the column.
In order to determine the material properties, coupon tests are conducted. According to KS B 0801 (Metal materials - Tension tests), specimens which were extracted from flange locations were used to the tests.
be considered. In this paper, the structural performance of column splice with metal touch is investigated by considering the parameters such as he splice type, the direction and width of gap and the change of splice part including the connection type. In addition, strain gages attached on column splices were used for investigating the stress transfer.
The conclusions drawn from this study were based on the structural perfonnance experiment of column splice with metal touch by the parameters such as the splice type, the direction and width of gap and the change of splice part including the connection type. The following conclusions are derived from the experimental results.
Here, the Metal Touch is that stress transfer in steel structures is attained by using the direct contact. The parameters of these specimens are column splice types, a gap width, and a direction of gap. Increasing a load, a defoiniation and the effects of connection with these parameters was examined.
The test was actuated by eccentric force to the strong axis. To study column splices with the Metal Touch, twenty two specimens under axial force and bending moment were tested.
Finally, the stress transfer with the data acquired from strain gauge on the column splice was examined. These were analyzed to study the column splice with Metal Touch subjected to axial force and bending moment.
Next, the column behaviors with the column splice types and the gap width were compared. Third, column splice parts through the measui'ement and the observation before and after the test were examined. Finally, the stress transfer with the data acquired from strain gauge on the column splice was examined.
Wth these experimental setups, a testing program is conducted to investigate the behavior of partial penetration weld splices, cover plate fillet welded splices and cover plate bolted splices with the parameters of a gap width and a direction of a gap.
대상 데이터
5mm, 6mm. 9mm, 12mm and 18mm. Fasteners are the high-strength bolts of F10T M20 or F10T M16.
tests are conducted. According to KS B 0801 (Metal materials - Tension tests), specimens which were extracted from flange locations were used to the tests. The yield points varied over the section as expected.
Strength limit states are such behavioral phenomena as achieving ductile maximum strength, buckling, fatigue, fracture, overturning, sliding and yielding. In this study, we selected 30. 50.
Thus, the columns subject to axial force and bending moment are studied. The tests were conducted using H-250x 250x9x14 shape of SS400 materials for twenty two specimens.
axis. To study column splices with the Metal Touch, twenty two specimens under axial force and bending moment were tested. Here, the Metal Touch is that stress transfer in steel structures is attained by using the direct contact.
성능/효과
and the direction of the gap. Although several factors contributed to the behavior of the column splice, in this study the PW series can behave like one column and the CW and CB series have the advantage of increasing the stiffness in splice part.
, 2004). The conclusion is that it is possible to transfer sufficient amounts of the load from an upper column to the lower one by directly contacting columns with splice imperfection. However, most columns are subjected to axial force and bending moment.
참고문헌 (15)
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