Applied Mechanics and Materials Vols. 578-579

Abstract: For tower structures located in high-intensity seismic zone, despite the importance of anti-seismic performance in flange connection, far less attention has been given to it. Based on finite element analysis results carried by ANSYS software, under pressure and moment, influence of stiffener height and axial compression stress ratio of steel pipe on the anti-seismic performance of flange connection was studied. The main results shows that lower axial compression stress ratio of steel pipe or higher stiffener height would improve the anti-seismic performance of flange connection. And closer flange connection from the end restraint would lead to better anti-seismic performance.

Abstract: To study the carrying capacity of precast concrete pipe pile (PC pipe pile)with holes, the ABAQUS finite element software is used to simulate the experiment of the PC pipe pile with holes carrying capacity from different holes arrayments.The results showed that the strength of the PC pipe pile decreased after the area of holes increased.With the same area of holes,the increase in diameter of holes caused the strength decreased. Guidance would be given for the permeable PC pipe pile by the paper.

Abstract: in this paper, making coal storage silo that diameter is a 120 m as the background, researched warehouse wall and pile caps using finite element method. In articles, the finite element analysis of soil, study the influence of prestressed reinforcement about prestressed effect, the structural response analysis under different stack forms and seismic analysis. The results show that: inside and outside temperature difference makes maximum stress, full load can reflect the other coal pile forms, the ability of resist the earthquake is strong.

Abstract: Articles with engineering examples discussed in the frame - shear wall structure of how to lay out the structure can effectively enhance the seismic performance of validated reasonable set of structural shear wall seismic played a key role, and for the frame - shear wall structure summed up the points to improve the seismic performance measures and design methods.

Abstract: Taking local compression on the center of plain concrete square column as an example, by using finite element analysis found that longitudinal stress distribution and size of local compression on the center of plain concrete square column related to local compression acting position and local compression area ratio.

Abstract: Due to the wide range of variables involved and sophisticated analysis techniques required, optimum structural design of composite submersible pressure hull is known to be a challenge for designers. The major challenge involved in the coupled design problem is to handle multiple conflicting objectives. The problem with its proper consideration through multi-objective optimization is studied in this paper. Minimize the buoyancy factor and maximize buckling load capacity of the submersible pressure hull under hydrostatic pressure is considered as the objective function to reach the operating depth equal to 6000m. Finite element analysis of composite elliptical submersible pressure hull is performed using ANSYS parametric design language (APDL). The constraints based on the failure strength of the hulls are considered. The fiber orientation angles and the thickness in each layer, the radii of the ellipse, the ring beams and the stringers dimensions are taken as design variables. Additionally, a sensitivity analysis is performed to study the influence of the design variables up on objectives and constraints functions. Results of this study provide a valuable reference for designers of composite underwater vehicles.

Abstract: Concrete composite beam floor cage floor as a new form , with a saving of steel and concrete , lighter weight, the advantages of high capacity , and has been more widely used in engineering. Therefore , to carry out the new concrete composite beam floor cages fire behavior for large spaces , large span areas is necessary. This article is the use of finite element software ANSYS multi-span composite floor beams cages fire tests to simulate life and death through SOLID70 unit features analog composite bottom plate before and after bursting floor temperature field and gives composite floor box overall temperature distribution along the rib cloud cover and the temperature of the beam cross-section of different heights - time curve , finally, the simulation results and experimental conditions were compared and analyzed , the main draw the following conclusions : the use of ANSYS thermal unit SOLID70 cell function and death can be simulated temperature distribution in case of fire concrete composite floor beam floor cages before and after bursting through the ribbed section of different heights temperature - time curve can be seen, the test results agree well with the simulation results ; testing process with increasing temperature , floor surface inlets, stacked boxes floor temperature contours directly reflects the law during the test floor surface appears inlets .

Abstract: Recently, submersible pressure hulls with fiber-reinforced multilayer constructions have been developed as substitutes for classical metallic ring-stiffened pressure hulls. The strength and stability is its top priority. In this paper, the optimum design of elliptical composite deep-submerged pressure hull under hydrostatic pressure is investigated based on the finite element analysis to minimize the buoyancy factor of the submersible pressure hull according to the design requirements. Minimize the buoyancy factor of a submarine pressure hull under hydrostatic pressure is proposed as an objective function and the constraints based on the failure strength and the buckling strength of the hulls are considered. The thickness and the fiber orientation angles in each layer, the radii of the ellipse, the stringers dimensions and the operating depth are taken as design variables. Additionally, a sensitivity analysis is performed to study the influence of the design variables up on the Tsai-Wu failure. Results of this study provide a valuable reference for designers of composite underwater vehicles.

Abstract: This paper extends the optimization model of space truss finite element method to planar steel lattice truss structures under multiple constraints involved with the strength and the stability of members as well as the mid span deflection based on sequential linear programming (SLP) and affine-scale dual algorithm with the size of members as the optimization variables and the minimum weight as the optimization objective. Algorithm implemented with programming, an example of square pyramid space grid is meant for the verification of the optimization performance that the algorithm and program extends an active control to the stability and the mid span deflection as well simultaneously during optimization. Moreover, stress and deflection constraints were enlarged and reduced, the optimization results indicate that more districted constraints bring about greater ultimate steel consumption, which extends a certification to the effectiveness of the proposal optimization model to deal with all kinds of stress and displacement constraints.

Abstract: With the hybrid structure including outer steel grids and inner reinforced concrete core tubes (RCCT) as the background, the key problems involved in the performance-based structural design are analyzed and the table test is conducted. Anti-seismic and stability indicators are defined based on the structural characteristics; The research on seismic response is made through elastic-plastic time-history analysis and verified through the table test; The overall stability of the outer steel grids and the anti-collapse capability following the ineffectiveness of some key components are analyzed. Results show that the structure in which the outer steel grids are connected with internal steel frame and RCCT is practicable, and the said three systems can work together effectively; The time-history analysis shows that the structure is weak at the elevation of 5-15m but can still meet the expected anti-seismic target under rare earthquakes. The space steel structure features sound stability and high redundancy, which ensures the structure will not collapse even if several key components are damaged.