松木桩作为一种传统地基处理方式,具有取材方便、施工简单和造价低廉等优点。本文结合松木桩在农水工程中实际应用情况,从力学性能认识、对地基土挤密的效果以及计算方法和参数确定等方面对松木桩承载力进行了较为全面地分析,提出软土...松木桩作为一种传统地基处理方式,具有取材方便、施工简单和造价低廉等优点。本文结合松木桩在农水工程中实际应用情况,从力学性能认识、对地基土挤密的效果以及计算方法和参数确定等方面对松木桩承载力进行了较为全面地分析,提出软土地基经松木桩处理后可提高承载力约60 k Pa,一般能满足农水工程中建筑物基础对地基承载力的要求,同时对松木桩基础处理提出设计方案。展开更多
A lightweight aggregate concrete-filled steel tube(LACFST) spatial truss beam was tested under bending load. The performance was studied by the analysis of the beam deflection and strains in its chords and webs. Accor...A lightweight aggregate concrete-filled steel tube(LACFST) spatial truss beam was tested under bending load. The performance was studied by the analysis of the beam deflection and strains in its chords and webs. According to the test results, several assumptions were made to deduce the bearing capacity calculation method based on the force balance of the whole section. An optimal dimension relationship for the truss beam chords was proposed and verified by finite element analysis. Results show that the LACFST spatial truss beam failed after excessive deflection. The strain distribution agreed with Bernoulli-Euler theoretical prediction. The truss beam flexural bearing capacity calculation results matched test evidence with only a 3% difference between the two. Finite element analyses with different chord dimensions show that the ultimate bearing capacity increases as the chord dimensions increase when the chords have a diameter smaller than optimal one; otherwise, it remains almost unchanged as the chord dimensions increase.展开更多
文摘松木桩作为一种传统地基处理方式,具有取材方便、施工简单和造价低廉等优点。本文结合松木桩在农水工程中实际应用情况,从力学性能认识、对地基土挤密的效果以及计算方法和参数确定等方面对松木桩承载力进行了较为全面地分析,提出软土地基经松木桩处理后可提高承载力约60 k Pa,一般能满足农水工程中建筑物基础对地基承载力的要求,同时对松木桩基础处理提出设计方案。
基金Project(51208176)supported by the National Natural Science Foundation of ChinaProjects(2012M511187,2013T60493)supported by the China Postdoctoral Science FoundationProject(2015B17414)supported by the Fundamental Research Funds for the Central Universities,China
文摘A lightweight aggregate concrete-filled steel tube(LACFST) spatial truss beam was tested under bending load. The performance was studied by the analysis of the beam deflection and strains in its chords and webs. According to the test results, several assumptions were made to deduce the bearing capacity calculation method based on the force balance of the whole section. An optimal dimension relationship for the truss beam chords was proposed and verified by finite element analysis. Results show that the LACFST spatial truss beam failed after excessive deflection. The strain distribution agreed with Bernoulli-Euler theoretical prediction. The truss beam flexural bearing capacity calculation results matched test evidence with only a 3% difference between the two. Finite element analyses with different chord dimensions show that the ultimate bearing capacity increases as the chord dimensions increase when the chords have a diameter smaller than optimal one; otherwise, it remains almost unchanged as the chord dimensions increase.
