Xiu Li Wang

Design of Long-Span and Wave-Shaped Steel Canopy Structure of Ningxia Helan Mountain Stadium

Ningxia Helan Mountain stadium the bottom grandstand of which is steel reinforced concrete frame shear wall structure, the top canopy of which is space steel truss structure system. Using SAP2000 (V9.1.6 version) and MIDAS (V7.1.2 version) software, to have an elasticity check analysis to the overrall structure. Discussion the vibration characteristics and seismic performance of the stadium steel canopy; According to computing and analysising the model, taking normative inspect, the consequence show that the structure can meet the bearing capacity, the stress ratio of the majority position are not more than 0.7, and the stress ratio of force greater position are about 0.95. This wave-shaped canopy structure is excellent, is good to the applicability of architectural form, and can be as a reference for the similar stadium.

Finite Element Analysis for Unstiffened Overlapped CHS KK-Joints Welded in Different Ways

The question whether hidden weld of unstiffened overlapped CHS (circular hollow sections) KK-joints is welded or un-welded is not clearly mentioned in Chinas steel structure design codes (GB50017-2003) .This paper mainly analyzes the influence of chord-to-brace diameter ratio β, diameter-to- ply ratio γ and brace-to-chord ply ratio τ to the ultimate bearing capacity of the joints with the hidden weld welded and un-welded. The influence of welded and un-welded hidden welds of the joints on hysteretic behavior under low frequency loading is analyzed , and hysteretic curve of the joints are obtained by the finite element software ANSYS. Side brace or opposite brace of the hidden weld of the joints has little influence on the failure modes and ultimate capacity of the joints. Hysteretic behavior of the joints with the hidden weld un-welded is much better than that of the welded.

An Experimental Study on Double-Tube Bucking Restrained Braces with Contact Rings

The paper designs the models of double-tube BRBs with contact rings by applying the existing general materials and carries out an experimental research on static properties, exploring on its bearing performance under the condition of unidirectional loading and the relationship between the bearing performance and the stiffness of outer-tube, clearance and slenderness ratio of inner-tube, so as to provide references for the engineering application of double-tube BRBs with contact rings.

Seismic Performance on Dumbbell-Shape Connection between Steel Beams and Rectangular Concrete-Filled Tubular Column

Referancing to the connection characteristic and mechanical behavior as well as the defects in application of joints on concrete-filled steel tube between columns and beams, a new connection type of steel beam throughout joints model is proposed. The inner force transfer mechanism and stress distribution situation of the joint under the monotonous load and hysteretic behavior, ductility, energy dissipation under cyclically lateral load are analyzed using the software ANSYS. The result indicated that the stress of steel pipe is reduced effectively when continious web plate joint is used. Meanwhile, the rigidity of the joint is enhancedand. It is also accord with the seismic design concepts, that is “strong column-weak beam“. During this process of the jiont working, plastic hinge occurs out of joint area on the beam. The hysteretic curves of all the specimens are of a plump shuttle shape .The curves don’t show strength deterioration and stiffness degradation obviously. All these show that this type of joint is effective.

Application for Quick Lime Improving Strength of Loess Subgrade

Quick lime has been widely applied for improving strength and water stability of loess due to its lower costs and better effect on subgrade construction. Taking collapsible loess of Dingxi section of Luoding Freeway in Gansu province as investigation object, CBR were done in cases of different quick lime contents, water contents and compaction times as well as immersion times. The results indicated that compaction degree of lime soil would be lower than that of loess as subjected to the same compaction times. The strength and water stability of loess mixed with quick lime would obviously improve. The optimal quick lime contents were equal to 3%. A dual linear regression equation of CBR was put forward and applied in six test sections of Luoding and Baotian freeways.

Hysteretic Performance Analysis of Double-Tube Buckling Restrained Braces with Contact-Ring

Double-tube buckling restrained braces with contact ring is a new buckling-restrained brace (BRBs), and is a refinement of double-tube buckling restrained braces. Based on the theory of the finite element method, the finite element entity model of double-tube buckling restrained brace with contact-ring has been made. The double-tube buckling restrained braces is systematically analyzed and computed. The analysis results indicate that this kind of buckling restrained brace has good energy dissipation and restoring force characteristics, and can overcome the difficulty in connection.

Experimental Study on Dynamic Responses of a New Type of Debris Flow Dam under Solid Impact Load

Dams can effectively alleviate great debris flow hazards to downstream regions, so they has been widely applied to prevention and control engineering of debris flow disaster now. A kind of steel-concrete combined structure with steel braces was presented based on conventional gravity dams, and the superiority of the new structure in terms of impact resistance was verified contrastively by means of model experiments under solid impact. The results show that braces can restrain cracks and reduce their width, thus the extent of damage in impact areas is alleviated effectively. Compared with the conventional dam, the dynamic strains and acceleration peak values of the dam with braces both observably reduce, and the highest reduction ranges of them may be up to 69.2% and 47.8% respectively, so the deformation and vibration are limited by the braces. The dynamic displacement peak values of the new-type dam are significantly less than the conventional dam, and the average reduction range of this index can reach to about 46%, so the structural stiffness has been enhanced by a large margin.

Study on the Impact Properties of a New Debris Flow Dam Based on Steel-Concrete Composite Structure

The impact force is one of the most weak link of the dynamics studies of debris flow for many years. To make the structure or components are better able to suffer the impact load such as debris flow, explosions, a new debris flow dam is designed by introducing this new type model with spring. It is simulated under boulder impact by using finite element software LS-DYNA.The stress distribution, impact and displacement time history curve under typical conditions are obtained. The results show that the resist impact effect of new debris flow dam is very obvious.

Dynamic Response of Reticulated Domes under the Impact

As the study of the dynamic response of single-layer reticulated domes under impact, Numerical models for single-layer Kiewitt-6 reticulated domes with sub steel cube column were established by the ANSYS/ LS-DYNA program and a dynamic analysis were carried out. Four failure modes for the reticulated domes were put forward according as the dynamic response and plastic deformation. The parametric analyses on the dynamic response of single-layer reticulated domes with sub steel cube column under the impact loading are carried out, by changing the impact velocity, mass of impact object, size of impact object and impact location.The effects of these parameters on the response mode of the structures are investigated, and the distribution regularity of the response modes of the structures with different parameters is explained.

Dynamic Response Analysis of Single-Layer Spherical Reticulated Shell under Horizontal Impact Load

Compared to the vertical impact, horizontal impact load is closer to real life. For example, external objector collision, debris flow hazards, terrorist attacks, etc. In this paper, a K6 single-layer reticulated shell structure model was established with ANSYS/LS-DYNA, and the influence of material strain rate was considered. Firstly, the basic theory of finite element method and the model parameters which were used in the analysis were introduced. Then changed the mass and velocity of impact body to analyze the dynamic response of the structure. Analysis results show that failure mode of the structure can be divided into five kinds under horizontal impact load; Horizontal deformation, the force of the main bar and impact force continued to increase as the increased of mass and velocity of impact matter; When the mass and the velocity increased to a certain value, the three of all were no longer change.