골조-전단벽 구조에서 상부 전단벽 미배치의 구조효과

김형기 한국구조물진단유지관리공학회 2016 한국구조물진단유지관리공학회 논문집 Vol.20 No.5

본 연구는 MIDAS-Gen을 사용하여 골조-전단벽 구조에서 상부 전단벽의 미배치에 대한 구조적인 효과를 검토하였다. 본 연구에서 는 해석 변수로 상부 전단벽의 미배치 층수, 상하 기둥 단면 치수의 변화, 상하 전단벽 두께 치수의 변화를 설정하였다. 골조-전단벽 구조에서 상부 전단벽의 미배치에 대한 구조적인 효과를 검토하기 위하여 전단벽의 미배치에 따른 전단력/전도모멘트 분포, 전단벽의 변곡점, 수평강성 에 대하여 비교분석하였다. 본 연구의 결과는 골조-전단벽 구조에서 상부 전단벽의 미배치가 수평강성과 같은 구조성능에 미치는 영향을 정량 적으로 제시하였다. 더욱이 본 연구의 결과는 합리적인 골조-전단벽 구조를 위한 구조설계 자료를 제공하는데 도움이 된다고 확인하였다. This research purposed to study a structural effect on curtailment of upper shear wall in frame-shear wall structures, using MIDAS-Gen. In this study, the analysis variables were the story number of curtailment of upper shear wall, change of column section in every 2 stories and change of shear wall thickness in every 2 stories. In order to analyse a structural effect on curtailment of upper shear wall in frame-shear wall structures, we studied the distribution of shear force and overturning moment according to curtailment of shear wall, the inflection point of shear wall from shear force/overturning moment and the lateral stiffness. The results of study proposed the quantitative influence that the curtailment of upper shear wall in frame-shear wall structures had on the structural performance such as lateral stiffness. Furthermore, it is verified that the results of study can be very helpful in catching the materials on the structure design for a reasonable frame-shear wall system.

중저층 상부벽식 하부골조 구조의 고유주기 산정식에 관한 연구

유석형 ( Suk-hyeong Yoo ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 논문집 Vol.25 No.5

국토교통부(2018)의 「필로티 건축물 구조설계 가이드라인」에서는 국내 필로티 형식의 다세대 주택과 같이 중저층의 상부벽식 하부 골조구조를 이루고 있는 복합구조의 고유주기를 안전성을 고려하여 상부 벽식구조에 해당하는 식을 적용하도록 제시하고 있다. 그러나 현행 벽식구조의 고유주기 산정 기준식은 주로 휨 거동하는 고층 벽식구조를 대상으로 한 실측 결과를 통하여 제정된 것으로서 벽체가 전단거동을 하는 국내 4층이하 필로티형 다세대 주택에는 적합하지 않을 것으로 사료되며, 또한, Park et al. (2000)은 해석적 연구를 통하여 10층 이상의 복합구조물의 고유주기에서 하부 골조구조의 영향이 상부 벽식구조보다 크게 작용하고 있음을 확인하였다. 따라서 본 연구에서는 중저층 필로티 구조의 고유주기에 미치는 하부골조의 영향을 검토하기 위하여 상부 벽식구조의 전단 및 휨 강성과 하부 골조구조의 전단강성을 변수로 하는 대상 구조물들에 대하여 유한요소 모델을 이용한 고유치 해석과 고유주기 산정 근사식 그리고 현행 고유주기 산정 기준식을 이용하여 고유주기를 산출하고 비교하였다. 비교결과 하부골조의 전단강성변화가 상부벽체의 휨 또는 전단강성의 변화보다 건물 전체의 고유주기에 더 큰 영향을 주는 것으로 나타났다. According to the 「Guidelines of Structural Design for Piloti Building」 of the Ministry of Land, Infrastructure and Transport (2018), the natural period of middle and low rise building of upper-walled lower frame type, such as the domestic multiplex house in piloti style, is suggested for safety to apply the existing code formula of the wall structure. However, the current code formula of the wall structure was provided based on actual measurement of high-rise wall-type structures that mainly exhibit bending behavior. So it is considered that it is not suitable for a piloti-type house with four stories or less, where the wall behaves in shear. See also Park et al. (2000) confirmed that the effect of the lower frame part is greater than that of the upper wall part in the natural period of complex structures with 10 or more floors through analytical studies. Therefore, in this study, in order to examine the effect of the lower frame on the natural period of the middle and low-rise piloti structure, the estimation of natural period by the finite element analysis, approximation formula and ccurrent code formula was performed for the target structures with the shear and flexural stiffness of the upper wall and the shear stiffness of the lower frame as variables. As result, it was found that the change in the shear stiffness of the lower frame had a greater effect on the natural period of the whole building than the change in the bending or shear stiffness of the upper wall.

강성 골조-전단벽 구조시스템의 수평강성 평가를 위한 구조해석

김형기 대한건축학회지회연합회 2016 대한건축학회연합논문집 Vol.18 No.3

본 해석연구는 Midas-Gen를 이용하여 강성 골조-전단벽 구조시스템의 수평강성을 평가하고자 하였다. 이 논문에서 해석연구의 주요한 변수는 기둥과 전단벽의 면적비와 2개층마다의 기둥과 전단벽의 단면변화 치수이다. 강성 골조-전단벽 구조시스템에서 수평강성의 향상을 위한 기둥과 전단벽의 단면 배치를 파악하고자, 30층 건물을 대상으로 수평강성을 비교분석하였다. 본 연구의 결과, 기둥과 전단벽의 단면 배치는 강성 골조-전단벽 구조시스템의 수평강성에 영향을 미치는 것으로 나타났다. 그리고 강성 골조-전단벽 구조시스템에 대한 최적의 구조설계를 위한 기본 자료를 얻는데 도움을 제공할 수 있는 것으로 나타났다. The analysis study aimed to evaluate the lateral stiffness in rigid frame-shear wall system, using MIDAS-Gen. In this paper, the primary factors of structural analysis study were the section area ratios of column, the change of section area between the upper columns and lower columns, the change of thickness between the upper shear wall and lower shear wall. With the intention of grasping the section layout of column and shear wall for improvement of lateral stiffness in rigid frame-shear wall system, we compared and analyzed the lateral stiffness of 30 stories high-rise building. The results of this study showed that the section layout of column and shear wall had an effect on the lateral stiffness in rigid frame-shear wall system. And the results of this analysis research can provided assistance in getting the basic data of structural design for the optimal rigid frame-shear wall system.

골조-전단벽 구조에서 수평강성의 향상을 위한 기둥과 전단벽 단면적의 배분

김형기(Kim, Hyong-Kee) 대한건축학회 2016 大韓建築學會論文集 : 構造系 Vol.32 No.7

The research intended to search the optimal section area apportionment of columns and shear walls for improvement of lateral stiffness in frame-shear wall structure, using MIDAS-Gen. In this study, the main variables of analysis research were the section area ratios of column, the change of section area between the upper and lower columns and the change of thickness between the upper and lower shear walls. In order to find out the optimal section area apportionment of columns and shear walls for improvement of lateral stiffness in frame-shear wall structure, we examined the 30 stories reinforced concrete building. The results of this analysis study indicated that the section area ratios of column, the change of section area between the upper and lower columns, the change of thickness between the upper and lower shear walls had an impact upon the lateral stiffness in frame-shear wall structure. Moreover, it is showed that the research results can give help in obtaining the structural design data for finding out the optimal section area apportionment of columns and shear walls for improvement of lateral stiffness in frame-shear wall structure.

전단변형효과를 고려한 부분강절 평면뼈대구조의 안정성 해석

민병철(Min Byoung Cheol),민동주(Min Dong Ju),정명락(Jung Myung Rag),김문영(Kim Moon Young) 대한토목학회 2011 대한토목학회논문집 A Vol.31 No.1A

구조부재의 연결은 강절(rigid), 활절(hinge) 그리고 부재 간의 상대적인 회전이 허용되는 부분강절(semi-rigid)로 구분될 수 있다. 본 연구에서는 부분강절을 탄성회전스프링으로 가정하여 부재 단부에 적용시킨 평면 뼈대구조에 대하여 전단변형을 고려한 엄밀한 접선강도행렬을 유도하고 이를 다시 탄성강도행렬과 기하학적 강도행렬로 분리?유도함으로써 부분강절을 갖는 평면 뼈대구조물의 안정성해석을 위한 일반화된 해석방법을 제시하고자 한다. 이를 위하여, 보-기둥부재의 좌굴조건을 만족시키는 처짐힘수로부터 안정함수(stability function)를 유도하고, 횡변위(sway)를 고려한 힘-변위관계와 적합조건을 고려하여 정확한 접선강도행렬을 제시하였다. 본 연구의 타당성을 입증하고 부분강절 뼈대구조의 전단거동 특성을 파악하기 위하여, 다양한 수치해석 예제에 대해 타 연구자 해석 결과와 본 연구의 안정성 해석결과를 비교하여 제시함으로서 전단변형과 부분강절이 구조물의 좌굴강도에 미치는 영향을 조사한다. Generally the connection of structural members is assumed as hinge, rigid and semi-rigid connections. The exact tangent stiffness matrix of a semi-rigid frame element is newly derived using the stability functions considering shear deformations. Also, linearized elastic- and geometric-stiffness matrices of shear deformable semi-rigid frame are newly proposed. For the exact stiffness matrix, an accurate displacement field is introduced by equilibrium equation for beam-column under the bending and the axial forces. Also, stability functions considering sway deformation and force-displacement relations with elastic rotational spring on ends are defined. In order to illustrate the accuracy of this study, various numerical examples are presented and compared with other researcher's results. Lastly, shear deformation and semi-rigid effects on buckling behaviors of structure are parametrically investigated.

Experimental and Numerical Investigation of Steel Moment Resisting Frame with U-Shaped Metallic Yielding Damper

Mehdi Ebadi Jamkhaneh,Amir Homaioon Ebrahimi,Maedeh Shokri Amiri 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3

This study introduces U-shape metallic yielding damper (UMYD) as an energy dissipation system. This damper may be used as a replaceable and cost-eff ective tool and fuse in structural frames to improve lateral ductility, energy absorption and damping of structural systems under earthquakes. A series of static cyclic tests were conducted in order to examine the performance of UMYD and the response of force-displacement, lateral strength, elastic stiff ness and energy absorption were achieved. Finite element numerical studies were conducted through changing damper geometrical parameters. Mathematical model was presented to estimate elastic stiff ness of damper and was compared with numerical specimen results, which acceptable conformity. Finite elements models indicated that UMYD abilities energy absorbability in large displacements without loss of strength and stiff ness, which may be a proper complementary system for lateral load-bearing systems. The behaviour of two 4- and 8-storey steel frames with moment resisting frame system was analysed under four diff erent earthquakes under two states of with and without damper. The seismic performance of frames was analysed with respect to fl oors inter-storey drift, frame base shear and fl oors shear. The non-linear time historey analysis results demonstrated that 8-storey frame without UMYD failed to maintain the structure performance level within life-safety level, whilst under all states using damper, performance level remained within such level and a decrease in fl oors shear and inter-storey drift was observed.

골조-전단벽 구조에서 수평강성의 향상을 위한 구조설계 방법

김형기 대한건축학회지회연합회 2015 대한건축학회연합논문집 Vol.17 No.1

본 연구는 구조해석 프로그램 Midas-Gen을 이용하여 기둥-전단벽 구조의 수평강성 향상을 위한 방법을 모색하고자 하였다. 본 연구의 주요한 변수는 기둥과 전단벽의 배치방법이다. 기둥-전단벽 구조의 수평강성 향상을 위한 방법을 모색하기 위하여 최상층 수평강성을 비교분석하였다. 본 연구의 결과, 기둥과 전단벽의 배치방법은 기둥-전단벽 구조의 수평강성 향상에 영향을 미치는 것으로 나타났다. 또한 본 연구에서 제시된 해석연구의 결과는 합리적인 기둥-전단벽 구조설계 자료를 확보하는데 도움이 될 수 있다고 생각된다. The goal of this research is to search the method of structural design for improvement of lateral stiffness in frame-shear wall structures, using the structural analysis program MIDAS-Gen. In this study, the main parameters of structural analysis were the layout method of column and shear wall etc. To look for the method of structural design for improvement of lateral stiffness in frame-shear wall structures, we analysed the lateral stiffness of top level which are the primary factors in the structural design of high-rise building. The study results indicated that the layout method of column and shear wall had an effect on the improvement of lateral stiffness in frame-shear wall structures. And the study results presented in this paper provided the basic data of structural design for the reasonable frame-shear wall structure in high-rise building.

Investigation of natural frequencies of multi-bay and multi-storey frames using a single variable shear deformation theory

Bozyigit, Baran,Yesilce, Yusuf Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.1

This study concerns about calculating exact natural frequencies of frames using a single variable shear deformation theory (SVSDT) which considers the parabolic shear stress distribution across the cross section. Free vibration analyses are performed for multi-bay, multi-storey and multi-bay multi-storey type frame structures. Dynamic stiffness formulations are derived and used to obtain first five natural frequencies of frames. Different beam and column cross sections are considered to reveal their effects on free vibration analysis. The calculated natural frequencies are tabulated with the results obtained using Euler-Bernoulli Beam Theory (EBT) and Timoshenko Beam Theory (TBT). Moreover, the effects of inner and outer columns on natural frequencies are compared for multi-bay frames. Several mode shapes are plotted.

Investigation of natural frequencies of multi-bay and multi-storey frames using a single variable shear deformation theory

Baran Bozyigit,Yusuf Yesilce 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.1

This study concerns about calculating exact natural frequencies of frames using a single variable shear deformation theory (SVSDT) which considers the parabolic shear stress distribution across the cross section. Free vibration analyses are performed for multi-bay, multi-storey and multi-bay multi-storey type frame structures. Dynamic stiffness formulations are derived and used to obtain first five natural frequencies of frames. Different beam and column cross sections are considered to reveal their effects on free vibration analysis. The calculated natural frequencies are tabulated with the results obtained using Euler-Bernoulli Beam Theory (EBT) and Timoshenko Beam Theory (TBT). Moreover, the effects of inner and outer columns on natural frequencies are compared for multi-bay frames. Several mode shapes are plotted.

Experimental and Numerical Investigation of Steel Beam-to-CFST Column Frame-Thin Steel Plate Shear Walls with Cross Stiff ness

Xian-tie Wang,Chuan-Dong Xie 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.6

Steel plate shear wall (SPSW) systems have been used increasingly in medium- and high-rise buildings in recent decades. Two major issues in the slender-web SPSW are the buckling of H-section steel column base and signifi cant pinching in hysteretic curves. As a solution, SPSW using concrete-fi lled steel tubular (CFST) column and cross stiff eners was proposed in this paper. Cyclic tests of two specimens of 1/3 scaled steel beam-to-CFST column frame-thin SPSW with cross stiff eners or without stiff eners were conducted. Based on the verifi ed fi nite element method, parametric investigations considering the eff ect of the fl exural rigidity of CFST column, width-to-height aspect ratio, height-to-thickness ratio of infi ll steel plate and relative rigidity of cross stiff ener were carried out. Findings show that SPSW using CFST column exhibited favorable ductility behavior with no sudden loss of lateral bearing capacity. Adding stiff eners to SPSWs relieves the pinching eff ect of hysteretic curves and reduces the maximum lateral displacement substantially. With stiff eners, the average yield load and the peak load of SPSWs were approximately 15% and 9% higher than that of the unstiff ened specimens. Moreover, a fl exural rigidity of CFST column of at least 2.5 and a stiff ener rigidity of 30–50 were recommended to provide an economical and approving lateral bearing capacity.