Analysis and Calculation of Stability Coefficients of Cross-Laminated Timber Axial Compression Member

Cross-laminated timber (CLT) elements are becoming increasingly popular in multi-storey timber-based structures, which have long been built in many different countries. Various challenges are connected with constructions of this type. One such challenge is that of stabilizing the structure against vertical loads. However, the calculations of the stability bearing capacity of the CLT members in axial compression in the structural design remains unsolved in China. This study aims to determine the stability bearing capacity of the CLT members in axial compression and to propose the calculation method of the stability coefficient. First, the stability coefficient calculation theories in different national standards were analyzed, and then the stability bearing capacity of CLT elements with four slenderness ratios was investigated. Finally, based on the stability coefficient calculation formulae in the GB 50005-2017 standard and the regression method, the calculation method of the stability coefficient for CLT elements was proposed, and the values of the material parameters were determined. The result shows that the average deviation between fitting curve and calculated results of European and American standard is 5.43% and 3.73%, respectively, and the average deviation between the fitting curve and the actual test results was 8.15%. The stability coefficients calculation formulae could be used to predict the stability coefficients of CLT specimens with different slenderness ratios well.

Effect of residual stress in longitudinal and transverse weld on global stability of box section steel column

In order to study the influence of welding residual stress on the global stability of box section steel column, the simulation of the side effects from the welding process of Q345 box section steel column by ABAQUS thermal-structure coupling analysis was conducted. A temperature-displacement explicit analysis step was established, and the residual stress caused by the temperature difference of the welding specimen was simulated by applying the body heat flux directly to the solid element within the same thickness range of the weld seam and defining the load amplitude; The calculated welding residual stress was taken as the initial defect of the structure and the global stable bearing capacity of the box section steel column was solved by the arc length method. Considering the influence of thickness and welding residual stress on the global stability of box section steel column, the calculation results of 12 finite element models were compared. The results show that under the same body heat flux, the residual stress of steel columns with different thicknesses during welding is different, and the maximum value can reach 791MPa; Under the condition of the same residual stress, the global stability bearing capacity of the box section steel column will also change irregularity with the change of thickness, and the global stability bearing capacity can be reduced by 3.07% compared with that no residual stress.

IMPLEMENTATION OF FREE LEARNING POLICY-INDEPENDENT CAMPUS PROGRAMS ON MASTERING COURSE THEORY OF FOUNDATION DESIGN

<p>Minister of Education and Culture Regulation No. 3 of 2020, entitles students to 3 semesters of study outside their study program. Through the Free Learning Policy - Independent Campus program, students have wide opportunity to be able to choose the learning method and place they want which is believed to be able to enrich and increase their insight and competence in the real world according to their passion and aspirations. The "Free Learning, Independent Campus" policy was initiated by the Minister of Education and Culture which includes 1) opening of new study programs, 2) higher education accreditation system, 3) freedom to become State universities with legal status, and 4) the right to study three semesters outside the study program. In planning a foundation structure, calculations must be included regarding the bearing capacity of the soil, soil stability, bearing capacity of the foundation and stability of the foundation, all of which are based on empirical and mathematical calculations. This research was conducted to analyze the level of student mastery of the Foundation Design course. With primary data collection in the form of questionnaires distributed to students of Civil Engineering, Banten Jaya University semester 7 (seven). One of the results of the research shows that students who take part in the apprenticeship program / practical work in projects with foundation work, but have not mastered the theory, most of them cannot plan and design the structure of the foundation (45 people = 84, 91%).</p>

Assessment of the Shelter Structures to Be Dismantled after NSC Installation. Comparative Analysis of Dismantling Options

The surveys of the bearing and enclosing civil structures damaged after the Chornobyl Unit 4 accident that were conducted by the State Research Institute of Building Structures and Institute for Safety Problems of Nuclear Power Plants from 1995 to 2012 showed that a number of structures were in unstable condition. They include a group of structures that are especially dangerous in terms of the bearing capacity and are very likely to collapse. To ensure safe operation, immediate stabilization measures were developed and successfully implemented at the Shelter in 2005—2008. The justifying calculations show that the structures will comply with nuclear and radiation safety requirements (in terms of stability, bearing capacity etc.) over 15 years. The most unstable structures have to be dismantled by 2023, which is one of the conditions in the strategic plan for further transformation of the Shelter into a safe system. Two stages of safety measures have been defined for the unstable structures to be dismantled. The functional purpose of and climatic impacts on the bearing structures and, as a consequence, the Shelter lifetime are subject to change after stabilization of the unstable structures and installation of the New Safe Confinement (NSC) into the designed position. The paper analyzes scenarios for dismantling of unstable structures, stabilization measures and the probability of failure after implementation of the stabilization measures. A list of structures subject to early and deferred dismantling is provided. Shelter safety criteria and radiation protection objectives are considered.

Parameter analysis of stability bearing capacity of bottom frame beam for container building

In this paper, the bottom frame beam of container building is analyzed by finite element method, and compared with the experimental results, the accuracy of the model is verified to meet the needs of the analysis. On this basis, by changing the stiffening position of the upper flange, the height of the web, the load layout and the thickness of the wall, the variation of the stability bearing capacity of the bottom frame beam was studied, the control factors affecting the stability bearing capacity of the bottom frame beam were obtained, and the selection suggestions were given.