土木工程建筑工程实验楼设计(英文文献+计算书+图纸) 第2页
Tansuxing deformation.
Therefore, we usually only with small effects and other load Zhen role of the basic effect combinations, who checked the structure and components of what cross-section of earthquake flexible deformation. And the effect of Zhen role requires a certain structure on the plasticity deformation capacity (remote) resistance. So extensive structure of the building earthquake is extremely important.
Two earthquakes of the size reduction coefficient determines the design of earthquake choose size to determine the size of the piping requirements
On the basis of the above, the seismic design for what could be the role for small level of the earthquakes, when the advent of greater earthquakes, depending on the structure of the piping to resist. Therefore, we do not access security intensity earthquake effort to structure what design and the security needs of a lower coefficient of intensity earthquakes, known as seismic capacity factor.
Seismic capacity factor greater access is on a smaller role in the design of earthquake; Obtain lower coefficient of smaller earthquakes, seismic design on a greater role. In the same security intensity of earthquakes of greater access to lower coefficient, the more the role of small earthquakes, then this small earthquakes role designed structure more low-yield standard means that the corresponding structure in a strong degree of non-seismic deformation greater flexibility, This requires a larger structure to ensure its larger non-ductile deformation of achieving flexibility, and thus to the request for more extensive. This extensive grading structure is lower seismic design requirements of the remote choose two higher "high extensive hierarchical" structure. Earthquake power to obtain lower coefficient smaller, the greater the role of the earthquake, then this big earthquake role designed structure on the higher yield levels, means that the corresponding structure in the strong earthquakes of a level of the non-flexible deformation more small, which only need a structure for the smaller piping to ensure it smaller non-realization of a flexible deformation, and thus to remote request gets. This extensive grading structure is a higher power choose two lower extensive seismic design requirements "low extensive hierarchical" structure. In the same security intensity of the earthquake is in the middle of lower coefficient for the earthquake role for the middle, resulting in extensive request for the middle. This extensive grading structure for the middle of choose Medium extensive seismic design requirements of the "middle-class remote" structure. Thus, the earthquake of the size factor in the decision to reduce the size of the design seismic forces choose to determine the size of piping required.
Three several kind of basic earthquake resistances systems performance
(1) Frame construction system: According to the above ability design mentality, through the reasonable design, may make the portal frame construction the ductility frame. The ductility frame under the big quake function, after appears beam hinge first, appears the column articulation such one kind to consume energy the organization diffusion massive earthquakes energy, the structure can withstand the certain lateral deformation. Therefore the pure portal frame construction is one kind of earthquake resistance performance very good structure. But at the same time us also saw to as a result of pure frame anti- side rigidity small, creates the side moves the value quite in a big way, therefore the constructive height not suitable too is high. Non- structural unit for instance packing wall under earthquake function, also possibly appears the crack and the destruction. Between the frame and the packing wall rigid joint creates the rigidity increases the effect also possibly to create designs on had not considered to increases side force. If is half high packing wall, but also can cause to form the short stump, the rigidity increases, the withstanding very big shearing force, creates the pillar the shearing failure.
(2) Shear wall structure system: Shearing force wall structure supporting capacity and rigidity all very big, the side moves distorts slightly, therefore its use scope may be higher than the pure portal frame construction. Is suitable also may use in the shearing force wall in the portal frame construction component non- linear earthquake resistance performance principle overall, also may design into the shearing force wall the ductility shearing force wall, also may come the diffusion earthquake energy by the stable way. But, in shearing force wall no matter is wall extremity binding beam, its section characteristic is short but high, this kind of component to detrusion quite sensitive, is easy to appear the crack, is easy to appear the brittle shearing failure. Therefore must carry on the careful reasonable design, only then can enable the shearing force wall to have the good earthquake resistance performance and the good ductility ability. The shearing force wall destruction shape if cuts steps compared to have the very big relations, to cuts steps compared to the very small low wall, by the shearing failure shape primarily, the plastic deformation ability is very bad, therefore should avoid in the anti-seismic structure using the low wall. Regarding the bracket wall energy aerodynamic, mainly is leaves the articulation through the wall bottom to carry on. But regarding the joint extremity wall, passes through reasonably supposes as follows the hole position, enable its energy aerodynamic mechanism with to have the strong column weak bream's bream articulation organization to be similar, forms strong wall weak bream, namely binding beam the bream end leaves the articulation, the wall bottom leaves the articulation, but the wall other places, do not appear the plastic hinge. Otherwise, if binding beam stronger than wall extremity, then can appear with the column articulation organization same level distortion organization. Regarding the long bracket wall, usually through artificial opens the hole to cause it to turn the joint extremity wall, because the bracket wall took calmly decides the structure, once has a section destruction to expire, can cause the structure to expire and to collapse, but unites the extremity wall then may design Cheng Qiangqiang weak bream, leaves the articulation number to be many, consumes energy in a big way. Cuts weakly with frame design is curved same, binding beam pole strength the extremity also needs to pass "strongly cuts weakly is curved" enhances its anti- cuts the bearing capacity, postpones the shearing failure, thus improves its ductility. But its own section characteristic influence, the component still cannot guarantee does not have the shearing failure, specially binding beam, in the ordinary circumstances ordinary matches when muscl binding beam is difficult to realizes the high ductility, the design, must specially take the measure to change its performance.
(3) frame shear walls structure system: Is the frame and the shearing force wall unifies in together resists vertical and the horizontal load one kind of system together, it uses the shearing force wall the high anti- lateral force rigidity and the supporting capacity, makes up the portal frame construction anti- side rigidity to be bad, distortion big weakness. As a result of the shearing force wall and the frame joint operation, improved the pure frame and the pure shear wall distortion performance, always distorts reduces, the level distorts reduces, moreover about tends to evenly, about the frame various story posts stress quite is also even. Moreover, under the earthquake function, the shearing force wall undertook the majority of shearing force, the frame has undertaken very small part of shearing force only, usually all was the shearing force wall submits first, after the shearing force wall will submit has the endogenic force redistribution, the frame assignment shearing force can increase, if the earthquake function continued to increase, the portal frame construction also could submit, causes it to form the curve distribution to tally well.
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