Influence of member geometric imperfection on geometrically nonlinear buckling and seismic performance of suspen-dome structures

2014 ◽  
Vol 14 (03) ◽  
pp. 1350070 ◽  
Author(s):  
Z. Zhou ◽  
J. Wu ◽  
S. Meng
Keyword(s):  
Critical Load ◽  
Seismic Performance ◽  
Seismic Analysis ◽  
Great Influence ◽  
Steel Structure ◽  
Analysis Method ◽  
Initial State ◽  
Nonlinear Buckling ◽  
Finite Element Program ◽  
Geometric Imperfection

This paper focuses on the effect of member geometric imperfection on nonlinear geometrically buckling and seismic performance of a new style of space steel structure, suspen-dome, which is composed of a reticulated shell and cable-strut system. By supposing the initial curvature of members as half-wave sinusoids, a stiffness equation of imperfect truss elements is derived for the struts, while that of imperfect beam elements is derived for the reticulated shell members. The proposed imperfect elements are implanted into ANSYS finite element program. Three numerical examples are employed to validate the proposed imperfect elements and analysis method. An ellipsoidal suspen-dome of Changzhou gymnasium is taken as an example. The results show that the imperfection value has relatively great influence on the structural stiffness. With the increase of member imperfection, the critical load decreases in a basically linear way. Under different prestress states, the relation curves between the critical load and imperfection are basically parallel. The nonlinear seismic analysis results show that when imperfection is included, the initial state responses are different, namely, the seismic displacement increases while the stress in rods and cables decreases. The proposed imperfection analysis method can be widely used in not only suspen-dome structures, but also other kinds of prestressed space grid structures. In this way, the influence of member imperfection on structural buckling and seismic performance can be estimated.

Stability Analyses of Single Arch in Arch-Reticulated Shell Hybrid Steel Structure of Beijing Jiangtai Winter Garden

2011 ◽  
Vol 94-96 ◽  
pp. 1328-1333 ◽  
Author(s):  
Yong Jiu Shi ◽  
Yang Gao ◽  
Yuan Qing Wang ◽  
Xiao Ping He
Keyword(s):  
Full Range ◽  
Great Influence ◽  
Steel Structure ◽  
Steel Structures ◽  
Hybrid Structure ◽  
Curtain Wall ◽  
Geometric Imperfection ◽  
Initial Geometric Imperfection ◽  
Arch Structure ◽  
The Stability

Global stability analysis cannot be ignored for large-span spatial steel structures. Beijing Jiangtai Winter Garden adopts hybrid structure with latticed shell and vertical cables, on which glass curtain wall is fixed. Therein the reticulated shell is composed of 9 spatial arches and other common frames, thus it can be seen as arch-reticulated shell hybrid structure. This paper analyzes the stability of one single arch structure which has the largest span in the whole structure, including buckling analyses and non-linear full range analyses. The results show that the stability of single arch meets requirements, and the nonlinearity has great influence on the stability of single arch structure. Besides, although the initial geometric imperfection has certain effect on the elastic structure, it has little effect on the elasto-plastic one.

scholarly journals Strengthening Methods of the Existing Reinforced Concrete School Buildings in Medina, Saudi Arabia

2019 ◽  
pp. 1-14
Author(s):  
Mohamed Laissy ◽  
Mohammed Ismaeila
Keyword(s):  
Saudi Arabia ◽  
Reinforced Concrete ◽  
Seismic Performance ◽  
Seismic Vulnerability ◽  
Seismic Analysis ◽  
Shear Walls ◽  
School Buildings ◽  
Analysis Method ◽  
Analysis And Design ◽  
Current Design

Nowadays, evaluation of the seismic performance of existing buildings has received great attention. This paper was carried out to study the effect of strengthening the existing reinforced concrete (RC) school buildings in Medina, Saudi Arabia through assessing the seismic performance and retrofitting where seismic analysis and design were done using equivalent static analysis method according to Saudi Building Code (SBC 301) and SAP2000 software. A Typical five-story RC school building designed according to the SBC301 has been investigated in a comparative study to determine the suitable strengthening methods such as RC shear walls and steel X-bracing methods. The results revealed that the current design of RC school buildings located in Medina was unsafe, inadequate, and unsatisfied to mitigate seismic loads. Moreover, adding steel X-bracing and RC shear walls represent a suitable strategy to reduce their seismic vulnerability.

scholarly journals Seismic analysis method of steel structures connections

2020 ◽  
Vol 17 (2) ◽  
pp. 51-59
Author(s):  
A. I. Garipov ◽  
◽  
P. A. Pyatkin ◽  
Keyword(s):  
Spectral Method ◽  
Seismic Analysis ◽  
Steel Structure ◽  
Steel Structures ◽  
Analysis Method ◽  
Internal Forces

The article presents a technique of calculating steel structures connections taking into consideration the results of seismic analysis of steel structure carried out by linear spectral method. This technique allows reaching the equilibrium of forces and moments applied to the connection, wherein extreme internal forces’ values received correspond to the internal forces’ values obtained according to the currently valid acting construction codes.

The Seismic Performance Analysis of Light Steel Story-Adding on Steel Frame

2014 ◽  
Vol 501-504 ◽  
pp. 1573-1579
Author(s):  
Hao Chen ◽  
Jiu Ping Wei ◽  
Tian Wang ◽  
Ting Ting Ma
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Damping Ratio ◽  
Great Influence ◽  
Steel Structure ◽  
Steel Frame ◽  
Frame Structure ◽  
Irregular Structure ◽  
Holistic Analysis ◽  
Layer Steel

It is common for using light steel structure as an upper layer to alter the multi-layer frame structure. But it is easy to form vertical irregular structure of rigid upper and flexible bottom. And the mass, stiffness, period and damping ratio are change after layer-adding. So it should take a holistic analysis of the structure. By using sap2000 to simulate a two-layer steel frame with a portal frame added, the seismic performance was analyzed. The result shows: transfer floor was relatively weak, it requires attention when seismic design; damping ratio has a great influence to seismic, it should been chose reasonably.

Seismic Performance Evaluation of Large Span Cable-Stayed Bridges

2013 ◽  
Vol 477-478 ◽  
pp. 1029-1033
Author(s):  
Min Zhang ◽  
Si Feng Qin ◽  
Li Song
Keyword(s):  
Performance Evaluation ◽  
Seismic Performance ◽  
Seismic Analysis ◽  
Pushover Analysis ◽  
Analysis Method ◽  
Seismic Performance Evaluation ◽  
Capacity Curves ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Cable Stayed Bridges

This paper focuses on the performance evaluation of long span cable-stayed bridge. Pushover method has been compared with RHA method to verify its validity. A specific bridge has been calculated by pushover analysis method using several different lateral load patterns. With four typical seismic analysis methods on the structure, the pushover analysis capacity curves have been compared with the RHA’s. It is demonstrated that the pushover method is accurate enough to be used in Engineering.

Experimental Study on Seismic Performance of Ridge Joint of Double C Steel under Cyclic Loading

2011 ◽  
Vol 243-249 ◽  
pp. 1435-1438 ◽  
Author(s):  
Ming Chen ◽  
Yang Sun ◽  
Bing Qian Pi
Keyword(s):  
Experimental Study ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Engineering Application ◽  
Steel Structure ◽  
Energy Performance ◽  
Gusset Plate ◽  
Cold Formed Steel ◽  
Bolt Spacing ◽  
Steel Section

The double C steel section is made of two C steels with gusset plate through bolts. A ridge joint of double C steel is studied through experiment under cyclic loading in this paper. Through the four specimens with different gusset-plate’s thickness and bolt spacing, we analyze the effect of the gusset-plate’s thickness and bolt spacing on stiffness, ductility and energy performance. At last we recommend the suitable gusset-plate’s thickness. The results can give a reference to the engineering application of cold-formed steel structure.

scholarly journals Seismic Analysis Method for Cabinets and Other Components of a Process Computer System.

1997 ◽  
Vol 63 (614) ◽  
pp. 3361-3366
Author(s):  
Hiroshi NIWA ◽  
Hidehiro FUKUI ◽  
Youichi SASAKI ◽  
Fumio HARA
Keyword(s):  
Computer System ◽  
Seismic Analysis ◽  
Analysis Method ◽  
Process Computer

Analysis of Nonlinear Buckling of a Long-Span Elliptic Paraboloid Suspended Dome Structure

2013 ◽  
Vol 639-640 ◽  
pp. 191-197 ◽  
Author(s):  
Zheng Rong Jiang ◽  
Kai Rong Shi ◽  
Xiao Nan Gao ◽  
Qing Jun Chen
Keyword(s):  
Single Layer ◽  
Buckling Mode ◽  
Nonlinear Buckling ◽  
Elliptic Paraboloid ◽  
Geometric Imperfection ◽  
Long Span ◽  
Initial Geometric Imperfection ◽  
Dome Structure ◽  
Unsymmetrical Loading ◽  
The Stability

The suspended dome structure, which is a new kind of hybrid spatial one composed of the upper single layer latticed shell and the lower cable-strut system, generally has smaller rise-to-span ratio, thus the overall stability is one of the key factors to the design of the structure. The nonlinear buckling behavior of an elliptic paraboloid suspended dome structure of span 110m80m is investigated by introducing geometric nonlinearity, initial geometric imperfection, material elastic-plasticity and half-span distribution of live loads. The study shows that the coefficient of stable bearing capacity usually is not minimal when the initial geometric imperfection configuration is taken as the first order buckling mode. The unsymmetrical loading distribution and the material nonlinearity might have significant effects on the coefficient. The structure is sensitive to the changes of initial geometric imperfection, and the consistent mode imperfection method is not fully applicable to the stability analysis of suspended dome structure.

scholarly journals Seismic Vertical Component Effects on the Pathology of a Historical Structure, Xana, Located in Greece

2021 ◽  
Vol 7 ◽  
Author(s):  
Vasiliki Terzi ◽  
Asimina Athanatopoulou
Keyword(s):  
Seismic Analysis ◽  
Near Field ◽  
Three Dimensional ◽  
Vertical Component ◽  
Element Model ◽  
Material Behavior ◽  
Initial State ◽  
Tensile Cracks ◽  
First Case ◽  
Three Dimensional Finite Element

The present study aims to investigate the effects of the seismic vertical component on the pathology of Xana monument which is a typical caravanserai, constructed circa 1375–1385 and is located in the archeological site of the municipality of Trainapoulis, Greece. The monument’s plan is rectangular and the three-leaf masonry circumferential walls support a hemicylindrical dome constructed by bricks and mortar. The structure consisted of two consecutive parts: one for the travelers and one for the animals. Nowadays, the triangular roof, that covered the structure, and the first part of the monument do not exist. Xana suffers tensile cracks along the interior surface of the dome, a vertical fracture located on the northern wall and vertical tensile cracks located at the openings. A three-dimensional finite element model of the initial state of Xana is constructed. Non-linear material behavior is taken into account as well as soil-structure interaction effects. An adequate number of near-field earthquake events has been used, taking into account that they are related to significant vertical components. The structural seismic analysis is conducted for two cases. The first case refers to the action of the two horizontal-component of ground motions while the second one takes into account the three translational seismic components. The pathology estimation reveals important information concerning the structural effects due to vertical accelerations.

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