Study On Multi-nodal Load Complex Structure Model Experiment Of Prestressed

The complex structure of prestressed anchor-rope and lattice beam is a kind of active protection system, which can excavate the self-potential of rock-soil body sufficiently and bring strong support effect. It has simple structure, light weight as well as less material using, which make the structure being used widely on slope support and landslide treatment. But at present the theoretic study on this structure drop far behind the engineering applications, especially the design calculation theoretic study is short relatively. So there would be important realistic meaning if study on design calculating of lattice beam.Because of those reasons bring above, this article bases on single node load model experiment of complex structure of prestressed anchor-rope and lattice beam and processes farther multi-nodal load model experiment analysis combine its analytic result, which simulates lattice beam stress in actual project. Experiment measures the strain, displacement as well as soil stress of the lattice beam. By comparing those measure data in different multi-nodal load mode as well as different single & multi-nodal load mode, analysis distortion and stress response pattern of the lattice beam as well as soil stress variety pattern, which considers: a. on condition of multi-nodal load, from load node extend to the middle of span which is about 170mm long the distortion of lattice beam is notching, while at the middle of span about 260mm range the distortion is upper protruding;b.for the longitudinal beams lay along the slope, the bottom of the beam subject to great friction affect by slope angle and anchor angle, when the cross beams lay along the cross direction, which makes it out of influence of friction, so the displacement of two of them is different, and the sensitivity of longitudinal beams on slope angle, anchor angle as well as border effect is greater than cross beams; c. the distortion of upper and lower parts of longitudinal beam is different, and the difference is related to the position of load, the infection range of upper parts affect by border effect is bigger than lower parts at the border node; d. the variety of soil stress does not present straight-line or linear distribution. On reverse the value on load node is bigger than the middle of span; e. the distance which load spread along the beam is 2/3 beam span, and along the soil is 1/2 beam span. The stress of lattice beam in condition of multi-nodal load is better than single load, for the distortion is more uniformity and less affect by twist moment. Besides, according to analysis on distortion and stress response pattern of longitudinal beam bring forward Winkler elastic foundation beam method which consider friction, and calculate the maximum deflection as well as twist moment in condition of multi-nodal load. Comparing calculated results with...