Determination of the number of shear faces connected by shear bolts

Under the action of such external force, the bolt will be displaced along the cross-section between the external forces on both sides and parallel to the line of action of the external force. This form of deformation is shearing, and the section where shear deformation occurs is the shear plane. The steel structure design specification 0.88 gives a simple description of the number of shear planes, single cut 1 , =1; double shear 2

Under the action of such external force, the bolt will be displaced along the cross-section between the external forces on both sides and parallel to the line of action of the external force. This form of deformation is shearing, and the section where shear deformation occurs is the shear plane. The steel structure design specification 0.88 gives a simple description of the number of shear planes, single cut 1 , =1; double shear 2 = 2 but some complicated connections, you need to carefully consider how the number of shear planes is determined. Some of the 2 joints in the paper are sometimes connected for the connection, and the members are connected to the other member or several other members by means of the filler. 14. To determine the number of shear faces, the contact surface of the bolt with the wall of the hole can be drawn. Use thicker segments in the face. If the contact surface of the bolt and the hole wall is judged by the number of connections of the upper multi-layer plate member of a certain section of the bolt, it is possible to obtain a connection of 5, = 263 of the connection 4 of the cross-shaped plate member, Then this section is the shear plane of the bolt. Obviously, the connection of 3, =1; 4 connection, =1 has a connection of the filler, the shear plane is sometimes a cross section, sometimes an oblique section. When calculating the number of shear planes, the claws 9395 may not be considered, and the low strain dynamic detection procedure of the piles is 8.

Xianbo Yuzhi (1) base, reflection wave detection rule, Xi.

From; å“š99, Shenzhen area based, quality inspection technical regulation.

Xu Tianping. Low-strain dynamic test pile technology, basic engineering dynamic test technology and method network. Wuhan China University of Geosciences Press, 1997, 9.

Ke Liwen. The frequency matching in the low-strain dynamic test pile is questionable. Guangzhou Guangdong Institute of Building Science, 1999.

The resistance is large, so that the stress wave signal is rapidly attenuated, and the concrete of the pile body has a low-strength area of ​​the severe segregation section, so that the energy of the stress wave signal is absorbed, and the morphological characteristics of the signal are also distorted. On-site inspection personnel should consider this factor and combine the other test methods to comprehensively assess the pile integrity of the pile under test.

The low-strain time-course curves of the complete piles with slight defects, severely defective piles and fractures usually show the morphological characteristics of their respective pile bottom reflection waves or fracture surface reflection waves, if in the time-course curve, in addition to the incident wave signal , basically no reflected wave signal, it must be combined with the actual situation to determine the integrity of the body.

There is a reason for the absence of the bottom reflection wave. The impact signal is connected. After the steel plate is subjected to the force in four directions, the contact surface between the bolt and the hole wall is drawn in the middle. According to the judgment method of the number of the shear surface, the determination can be made. The connected shear plane 5 concludes that the number of shear planes can be drawn in a simple way by drawing the contact surface of the bolt and the wall of the hole after the force is applied. If the contact surface is above or below the cross section of the bolt, then this The cross section is the shear plane of the bolt.

2 The shear plane is sometimes the cross section of the bolt. Sometimes it is the oblique section of the bolt, when it is cut. When the distance between the lower or left and right ends of the bolt and the wall of the hole is relatively close. The shear plane is the cross section of the bolt; when the distance is far. When the shear plane is a bolt, when determining the number of shear planes, it should be noted that the bolts are not only sheared. It is also bent, but the bolt cannot be used as a beam because the length and diameter of the bolt are an order of magnitude.

It is possible to improve the design value of the shear bearing capacity of a shear bolt when the shear plane is an oblique section.

Sun Xunfang. The trembling mechanics are ten high. Education Press. Rush 4.

Untouchables. Steel knot, design principle, 1. Shanghai Tongji learned to Ouyang Keqing. Steel Structure Beijing China Construction Industry Press 1.

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