预应力锚索桩在治理滑坡应用中的几个力学问题

通过预应力锚索桩在三峡库区重庆市万州区黄泥包、康家坡滑坡治理中的应用,提出了用预应力锚索桩治理滑坡所应注意的几个力学问题,对类似工程预应力锚索桩的设计有指导意义,并分析了这几个问题对预应力锚索桩在治滑效果方面的影响。     

Mechanical behavior of tubular T-joint after fire

This paper presents experimental results of the post-fire behavior of tubular T-joints. The research aims at the failure modes and the residual strengths of the T-joints after fire. Three tests of full-scale tubular T-joints are conducted. The first one is carried out to study the mechanical behavior of T-joints under ambient temperature. The other two tests are performed to study the influence of pre-load, heating and cooling phase on residual load-bearing capacity of the tubular T-joints. The test results show that the sustained axial load on the brace has remarkable influence on the residual deflection of the T-joints which is cooled down to room temperature. The results of the experiments also indicate that the axial load level and heating and cooling history have more significant effects on the compressive stiffness of the T-joints than the residual strength. In the numerical study, the result of finite element model agrees well with the test result. The work in this paper provides a basis for further parametric analysis and theoretical study on the structural evaluation after fire.