Study On Complex Structure Model Experiment Of Prestressed Anchor-rope And Lattice Beam

The complex structure of prestressed anchor-rope and lattice beam is a kind of active protective system which is wild used on slope protection as well as landslide disposing at recent years. It is composed of anchor-rope and lattice beam. This complex structure can utilize the latent energy of soil and rock mass, and generate powerful supporting action. Because of its simple structure and light self-weight as well as saving in materials, it has better economic technical value. 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 the main study contents of this thesis are as follows: the load distribution pattern along the length beam and the cross beam in the place of node, the appropriate matching rigidity of the length and cross beams in the action of same anchorage force and the affection pattern discuss on sloping surfaces dip angle, beam rigidity , anchor-rope angle as well as the position of load which affect the load distribution ratio on length and cross beams. In the end it brings forward lattice beam internal force calculated method on the basis of double parameter groundsill model. The thesis applied model experiment, and finished the study contents above through orthogonal experimental design. The experimental results indicate that variation in beam rigidity affect mostly the load distribution ratio on length and cross beams in position of anchor action spot. The load distribution ratio on length and cross beams is equality relatively with the value of 1 when the value of rigidity ratio of length and cross beams is among 0.558~1, and when the rigidity ratio is bigger than 1, the amplitude of variation of distribution ratio become larger, which indicates that the difference of distribution load value on length and cross beams is quite big and asymmetry. The load position affection on distribution ratio is also notable, while the sloping surfaces dip angle and anchor-rope angle affections are not obvious. The results of lattice beam internal force calculated method based on double parameter groundsill model are more approach the experiment measured values because of consideration of the pass of shearing force in soil, and its calculated workloads are similar with the method of winkler elastic foundation. Besides, the thesis also discusses the moment of torque affected results on node stress situation and the correction of stress value at the bottom of cross node of lattice beam. Due to the repeat calculation of node area during internal force calculation, the stress value of the bottom of beam is lower, this may lead the calculated value unsafe, but the corrected stress value will more approach to practical situation. At last, it proves the rationality of experimental results through finite element model. The conclusions that the thesis achievements have important meanings for the design calculation of the complex structure of prestressed anchor-rope and lattice beam in engineering, and they also have certain reference value when study deeply on the action mechanism of this complex structure.